CN114914665B - Antenna and terminal equipment - Google Patents
Antenna and terminal equipment Download PDFInfo
- Publication number
- CN114914665B CN114914665B CN202110172915.0A CN202110172915A CN114914665B CN 114914665 B CN114914665 B CN 114914665B CN 202110172915 A CN202110172915 A CN 202110172915A CN 114914665 B CN114914665 B CN 114914665B
- Authority
- CN
- China
- Prior art keywords
- branch
- antenna
- connection portion
- stub
- resonant frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000758 substrate Substances 0.000 claims abstract description 65
- 230000005540 biological transmission Effects 0.000 claims description 40
- 230000008878 coupling Effects 0.000 description 28
- 238000010168 coupling process Methods 0.000 description 28
- 238000005859 coupling reaction Methods 0.000 description 28
- 239000002131 composite material Substances 0.000 description 22
- 238000010586 diagram Methods 0.000 description 18
- 239000004020 conductor Substances 0.000 description 17
- 230000003247 decreasing effect Effects 0.000 description 14
- 238000009826 distribution Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000001788 irregular Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Landscapes
- Details Of Aerials (AREA)
Abstract
The application provides an antenna and terminal equipment, which are used for widening the working frequency band of the terminal equipment. The antenna includes dielectric substrate, radiator, feed end and earthing terminal, and the radiator sets up on dielectric substrate, and the radiator includes first branch, second branch, third branch and fourth branch, wherein: the first branch is in an open ring shape, and the head end of the first branch is electrically connected with the grounding end; the head end of the second branch is electrically connected with the feed end, and the tail end of the second branch is coupled with the tail end of the first branch; the head end of the third branch is electrically connected with the feed end, and the tail end of the third branch is coupled and connected with the first branch; the first end of the fourth branch is connected with the first branch, and the tail end of the fourth branch is grounded.
Description
Technical Field
The present application relates to the field of terminal devices, and in particular, to an antenna and a terminal device.
Background
The customer premise equipment (customer premise equipment, CPE) is used as a wireless broadband access device, can convert signals sent by the base station into WiFi signals which are universal for mobile terminals such as smart phones, tablet computers and notebook computers, and can support surfing of a plurality of mobile terminals at the same time. At present, with the development of 5G technology, a coverage requirement of a 0.6GHz frequency band is newly added to CPE products, however, the existing Sub-3G antenna scheme only supports the 0.7 GHz-0.9 GHz frequency band, and cannot meet the frequency band coverage requirement of the products. Based on this, how to widen the working frequency band of CPE products is a technical problem to be solved at present.
Disclosure of Invention
The application provides an antenna and terminal equipment, which are used for widening the working frequency range of the terminal equipment and improving the working performance of the terminal equipment.
In a first aspect, the present application provides an antenna, which may include a dielectric substrate, a radiator, a feed end, and a ground end, where the radiator may be disposed on the dielectric substrate, and the radiator may receive and transmit radio frequency current signals through the feed end. When the radiator is specifically arranged, the radiator can comprise a first branch, a second branch, a third branch and a fourth branch, wherein the first branch can be in an open ring shape, and the head end of the first branch is electrically connected with the grounding end; the head end of the second branch can be electrically connected with the feed end, and the tail end of the second branch and the tail end of the first branch can be coupled and connected through a capacitive structure, so that a current signal on the second branch can be coupled to the first branch; the head end of the third branch is electrically connected with the feed end, and the tail end of the third branch can be coupled with the first branch through a capacitive structure, so that the coupled feed of the first branch is realized; the first end of the fourth branch is electrically connected with the first branch, and the tail end of the fourth branch is grounded.
The antenna provided by the application can generate four working modes, namely a left-hand and right-hand composite antenna mode formed by mutually coupling the tail end of the first branch with the tail end of the second branch, a 1/4 lambda mode from the fourth branch to the tail end of the first branch, a 3/4 wavelength mode of the first branch excited by the third branch to the first branch feed and a loop antenna mode formed by the first branch and the second branch by connecting the first branch with the grounding end, and feeding the first branch to the head end of the second branch and connecting the fourth branch which is grounded on the first branch. Through the four working modes, the antenna can realize continuous coverage in the frequency band of 0.6 GHz-0.96 GHz and the frequency band of 1.427GHz-1.517GHz, thereby widening the working frequency band of the terminal equipment and improving the working performance of the terminal equipment.
The radiator can be formed on the dielectric substrate by printing, photoetching and the like, so that the manufacturing process of the antenna can be simplified. Alternatively, the radiator may be formed by punching, cutting, or the like, and then bonded and fixed to the dielectric substrate. The dielectric substrate may be a hard substrate, a soft substrate, or a combination of both.
In some possible embodiments, the shape of the split ring of the first branch may be rectangular, circular, oblong or some other regular or irregular shape, and specifically may be configured according to the shape of the dielectric substrate, which is not limited by the present application.
Taking the first branch as a rectangular split ring as an example, the first branch may include a first connecting portion, a second connecting portion, a third connecting portion and a fourth connecting portion which are sequentially connected, an opening forming the split ring is formed between an end of the first connecting portion and an end of the fourth connecting portion at intervals, at this time, the end of the first connecting portion may be formed as a head end of the first branch, and the end of the fourth connecting portion may be formed as a tail end of the first branch. At this time, the first connecting portion and the third connecting portion are disposed in parallel, and the first connecting portion and the third connecting portion may extend along the first direction respectively; the second connecting portion and the fourth connecting portion are disposed in parallel, and the second connecting portion and the fourth connecting portion may extend along a second direction, respectively, it being understood that the second direction is different from the first direction. By adopting the design, the shape of the first branch is more regular, which is beneficial to improving the structural compactness of the antenna.
In a specific embodiment, the second branch may extend along the second direction, and the end of the second branch may be located between the fourth connection portion and the second connection portion, so that the structure of the antenna may be more compact. The end section of the second branch and the end section of the fourth connecting part can be arranged in parallel and have a first gap, so that a current signal on the second branch can be coupled to the first branch through the first gap.
In another specific embodiment, the end of the second branch may also be located on a side of the fourth connection portion facing away from the second connection portion, where a section of the end of the second branch and a section of the end of the fourth connection portion may also be disposed in parallel and formed with a certain gap, so that the current signal on the second branch may be coupled to the first branch through the gap.
In some possible embodiments, the end section of the fourth connecting portion may be provided with a first protruding portion, which may be located at a side of the fourth connecting portion facing the second branch. The first protruding part can adjust the impedance matching of the antenna, and is beneficial to enabling the antenna to obtain higher gain.
In some possible embodiments, the end section of the second branch may be provided with a second protrusion, which may be located at a side of the second branch facing away from the fourth connection portion. Similarly, the second protrusion may also adjust the impedance matching of the antenna, which is advantageous for obtaining a higher gain of the antenna.
In some possible embodiments, the third branch may be disposed between the second branch and the second connection portion, so that the structure of the antenna may be more compact, which is beneficial to reducing the occupied space of the antenna in the terminal device.
In a specific design, the third branch joint may include a first branch, a second branch, a third branch and a fourth branch that are sequentially connected, where the first branch is disposed along a first direction, and the first branch is located at a side of the second branch joint close to the second connection portion; the second branch extends along a second direction; the third branch extends along the first direction and is positioned at one side of the second branch close to the second connecting part; the fourth branch extends along the second direction, a second gap is formed between the fourth branch and the second connecting part, and a distributed capacitive coupling structure can be formed between the fourth branch and the second connecting part through the second gap, so that a current signal on the third branch can be coupled to the first branch through the second gap.
In some possible embodiments, the midpoint of the fourth branch has a projection point on a side of the second connection portion facing the fourth connection portion, the electrical length between the projection point and the first connection portion being 1/3 of the electrical length of the first branch. By adopting the design, the feed end feeds the radio frequency current signal to the antenna at the head end of the third branch, and the tail end of the third branch feeds the first branch in a coupling way near the projection point, so that a 3/4 lambda mode of the first branch is excited.
In some possible embodiments, the first branch, the second branch and the third branch may be disposed on the first surface of the dielectric substrate, so that positioning difficulty of each branch on the dielectric substrate is reduced, and manufacturing process of the antenna is simplified.
In some possible embodiments, the fourth branch may extend along the thickness direction of the dielectric substrate, so as to reduce the cross-sectional area of the antenna in the thickness direction perpendicular to the dielectric substrate, and facilitate the installation of the antenna inside the terminal device.
In some possible embodiments, the antenna generates a first resonant frequency through the first stub and the second stub; the antenna generates a second resonant frequency through the fourth branch and the first branch; the antenna generates a third resonant frequency through the third branch and the first branch; the antenna generates a fourth resonant frequency through the first stub and the second stub.
In a specific embodiment, the antenna generates a first resonant frequency in a left-right hand composite mode in which the first branch and the second branch are coupled to each other, the antenna generates a second resonant frequency in a 1/4 wavelength mode from the fourth branch to the end of the first branch, the antenna generates a third resonant frequency in a 3/4 wavelength mode from the third branch to which the third branch is coupled to feed excitation, and the antenna generates a fourth resonant frequency in a loop antenna mode formed by the first branch and the second branch.
Wherein the first resonance frequency is approximately 0.6 GHz-0.7 GHz, the second resonance frequency is approximately 0.7 GHz-0.8 GHz, the third resonance frequency is approximately 0.8 GHz-0.96 GHz, and the fourth resonance frequency is approximately 1.427GHz-1.517GHz. It can be seen that, through the first three resonance modes, the antenna can realize continuous coverage in the frequency band of 0.6 GHz-0.96 GHz, and through the fourth resonance mode, the antenna can realize coverage in the frequency band of 1.427GHz-1.517GHz, so that the working frequency band of the terminal equipment can be widened, and the working performance of the terminal equipment is improved.
In a second aspect, the present application further provides a terminal device, where the terminal device includes a circuit board, a feed transmission line, and an antenna in any one of the foregoing possible embodiments, where a radio frequency transceiver circuit is disposed on the circuit board, and the radiator is electrically connected to the radio frequency transceiver circuit through the feed transmission line, so as to convert current energy fed into the antenna by the radio frequency transceiver circuit through the feed transmission line into electromagnetic energy to radiate, and convert electromagnetic energy received by the antenna into current energy to transmit to the radio frequency transceiver circuit through the feed transmission line, so that the terminal device implements a signal transceiver function. The terminal equipment can transmit and receive signals in a relatively wide working frequency band, and can be suitable for a multipurpose application scene.
In some possible embodiments, the circuit board may be a multi-layer board, in a multi-layer structure of the circuit board, one or more strata may be included, and the fourth branch of the antenna may be specifically grounded by being connected to the strata, where the antenna may be supported on the circuit board through the fourth branch, so that not only can the fixing of the antenna inside the terminal device be achieved, but also the grounding scheme of the fourth branch can be conveniently achieved.
Drawings
Fig. 1 is a schematic diagram of a partial structure of a terminal device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an antenna according to an embodiment of the present application;
FIG. 3a is an equivalent circuit diagram of a right hand transmission line;
FIG. 3b is an equivalent circuit diagram of a left-hand transmission line;
fig. 3c is an equivalent circuit diagram of a left-right hand composite transmission line;
fig. 4 is a schematic diagram of current distribution on the radiator of the antenna in the first operation mode;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
fig. 6 is a schematic diagram of current distribution on the radiator of the antenna in the second operation mode;
fig. 7 is a schematic diagram of current distribution on the radiator of the antenna in the third operation mode;
FIG. 8 is a partial enlarged view at B in FIG. 7;
fig. 9 is a schematic diagram of the current distribution on the radiator of the antenna in a fourth mode of operation;
Fig. 10 is an S-parameter graph of an antenna according to an embodiment of the present application;
fig. 11 is an antenna efficiency graph of an antenna according to an embodiment of the present application;
fig. 12 is a graph of S-parameters after antenna tuning according to an embodiment of the present application;
fig. 13 is a graph of antenna efficiency after antenna tuning according to an embodiment of the present application.
Reference numerals:
1-a terminal device; 100-a housing; 200-a circuit board; 300-antenna; 10-a dielectric substrate; 20-a radiator;
30-feed point transmission lines; 21-first knots; 22-second knots; 23-third branch; 24-fourth branch;
211-a first connection; 212-a second connection; 213-a third connection; 214-a fourth connection; 2141—a first protrusion;
221-a second projection; 231-first branch; 232-a second branch; 233-third branch; 234-fourth branch.
Detailed Description
In order to facilitate understanding of the antenna provided by the embodiment of the present application, an application scenario thereof will be described below. The antenna provided by the embodiment of the application can be applied to terminal equipment and is used for enabling the terminal equipment to realize a signal receiving and transmitting function. The terminal device may be a CPE, a router, a long term evolution (long term evolution, LTE) device, or a worldwide interoperability for microwave access (world interoperability for microwave access, wiMAX) device, etc. For example, CPE is a communication device located at an end user premises, and may be a Mobile Station (MS) or a subscriber station (subscriber station, SS). The CPE can convert cellular signals such as LTE, wideband code division multiple access (wideband code division multiple access, W-CDMA), global system for mobile communications (global system for mobile communications, GSM), 5G mobile network (5G new radio,5G NR) and the like into WiFi signals common to mobile terminals such as ethernet or smart phones, tablet computers, notebook computers and the like, and can support surfing the internet with multiple mobile terminals at the same time.
At present, with the development of 5G technology, NR frequency bands are further widened, and the coverage requirement of 0.6GHz frequency bands is newly increased for CPE products, however, the existing Sub-3G antenna scheme only supports 0.7 GHz-0.9 GHz, and the coverage requirement of the frequency bands of the products cannot be met. Based on the above, the application provides an antenna and terminal equipment using the same, wherein the antenna can generate four working modes, and can realize continuous coverage in the frequency band of 0.6 GHz-0.96 GHz and the frequency band of 1.427GHz-1.517GHz, so that the working frequency band of the terminal equipment can be widened, and the working performance of the terminal equipment is improved. Referring to fig. 1, fig. 1 is a schematic diagram of a partial structure of a terminal device 1 according to an embodiment of the present application. The terminal device 1 includes a housing 100, a circuit board 200 and an antenna 300 provided in the housing 100. The circuit board 200 is provided with a radio frequency chip (not shown in the figure) and a radio frequency transceiver circuit, the radio frequency chip can be arranged on the circuit board 200 by means of wafer level packaging or film-rewinding packaging, and the radio frequency transceiver circuit is connected with a radio frequency port of the radio frequency chip. The antenna 300 includes a dielectric substrate 10 and a radiator 20, the dielectric substrate 10 is used for supporting and fixing the radiator 20, the radiator 20 is disposed on the dielectric substrate 10, and the radiator 20 can be electrically connected with a radio frequency transceiver circuit through a feed transmission line 30, so as to convert current energy fed into the antenna 300 by the radio frequency transceiver circuit through the feed transmission line 30 into electromagnetic energy to radiate, and convert electromagnetic energy received by the antenna 300 into current energy to transmit the current energy to the radio frequency transceiver circuit through the feed transmission line 30, so that the terminal device 1 realizes a signal transceiver function. It should be understood that the electrical connections described in the embodiments of the present application include direct connections and coupled connections. It should be noted that fig. 1 and the following related drawings only schematically show some components included in the terminal device 1, and the actual shape, actual size, actual position, and actual configuration of these components are not limited by fig. 1 and the following drawings.
In this embodiment, the circuit board 200 may be a hard circuit board, a flexible circuit board, or a soft-hard combined circuit board. The circuit board 200 may employ an FR-4 dielectric board, a Rogers dielectric board, a hybrid dielectric board of FR-4 and Rogers, or the like. Here, FR-4 is a code of a flame resistant material grade, and the Rogers dielectric board is a high frequency board. In some embodiments, the circuit board 200 may be a multi-layer board, and the radio frequency chip may be specifically disposed on a top or bottom layer board of the circuit board 200. In addition, one or more ground layers may be included in the multi-layer structure of the circuit board 200. The cross-sectional shape of the circuit board 200 in a direction perpendicular to the thickness direction thereof is not limited to the rectangular shape shown in fig. 1, and in other embodiments, the cross-section of the circuit board 200 may be circular, oblong, or other regular or irregular shape, which the present application is not limited to. When the cross-sectional shape of the circuit board 200 is rectangular, the cross-sectional dimension of the circuit board 200 may be approximately 90mm by 145mm. It should be noted that, the terms of "top" and "bottom" used by the terminal device in the embodiment of the present application are mainly described according to the display orientation of the terminal device in fig. 1, and do not form limitation on the orientation of the terminal device in the actual application scenario.
Similarly, the dielectric substrate 10 may be a hard substrate, a flexible substrate, or a hard-soft bonded substrate. It can be appreciated that when the dielectric substrate 10 is a flexible substrate or a rigid-flexible substrate, a reinforcing plate may be disposed on a surface of the dielectric substrate 10 away from the radiator 20, so as to reliably support the radiator 20. The dielectric substrate 10 may be an FR-4 dielectric plate, a Rogers dielectric plate, a mixed dielectric plate of FR-4 and Rogers, or the like. In addition, the cross-sectional shape of the dielectric substrate 10 is not limited to the rectangular shape shown in fig. 1, and in other embodiments, the cross-section of the dielectric substrate 10 may be circular, oblong, or other regular or irregular shape, which is not limited by the present application.
In some embodiments, the feeding transmission line 30 may be a coaxial line, where the feeding transmission line 30 includes an inner conductor and an outer conductor coated outside the inner conductor, the inner conductor of the feeding transmission line may be used for feeding, the outer conductor is used for grounding, and an insulation medium layer is between the inner conductor and the outer conductor. When the antenna is specifically arranged, one end of the inner conductor of the feed transmission line 30 is electrically connected with the radio frequency transceiver circuit, and the other end is electrically connected with the radiator 20; one end of the outer conductor of the feeding transmission line 30 is electrically connected to the grounding member of the terminal device 1, and the other end is electrically connected to the radiator 20. In some embodiments, the grounding member may be a ground layer of the circuit board 200, in which case the outer conductor of the feed transmission line 30 is grounded to the ground layer of the circuit board 200. In other embodiments, the grounding member may be other metal components such as a radiator of the terminal device 1, and the outer conductor of the power feeding transmission line 30 may be grounded by being connected to the metal components.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an antenna according to an embodiment of the present application. In the embodiment of the present application, the radiator 20 may be formed on the dielectric substrate 10 by a printing process, a photolithography process, or the like, or may be fixed on the dielectric substrate 10 by bonding or other fixing methods after being formed by a stamping process, a cutting process, or the like. The application does not limit the specific forming mode of the radiator. The radiator 20 may include four branches, namely, a first branch 21, a second branch 22, a third branch 23, and a fourth branch 24, and the structure and arrangement of each branch are described in detail below with reference to fig. 2.
The first branch 21 may include a first connection portion 211, a second connection portion 212, a third connection portion 213, and a fourth connection portion 214, where, when specifically set, a head end of the first connection portion 211 is a ground end of the antenna 300, a head end s1 of the first connection portion 211 is connected to an outer conductor of the feed transmission line 30, a tail end f1 of the first connection portion 211 is connected to a head end s2 of the second connection portion 212, a tail end f2 of the second connection portion 212 is connected to a head end s3 of the third connection portion 213, a tail end f3 of the third connection portion 213 is connected to a head end s4 of the fourth connection portion 214, and a tail end f4 of the fourth connection portion 214 is spaced from the head end s1 of the first connection portion 211. It should be noted that the "head end" and "tail end" of each connection portion of the first branch 21 may be determined according to a direction in which the connection portions are sequentially connected (e.g., clockwise direction in fig. 2), and along this connection direction, an upstream end of each connection portion may be defined as a "head end" and a downstream end may be defined as a "tail end". It can be understood that the head end s1 of the first connecting portion 211 is the head end of the first branch 21, and the tail end f4 of the fourth connecting portion 214 is the tail end of the first branch 21.
In some embodiments, the respective connection portions may be disposed on the same side of the dielectric substrate 10. For example, in the embodiment shown in fig. 2, each connection portion is disposed on the first surface 11 of the dielectric substrate 10, and the head ends and the tail ends of two adjacent connection portions can be directly connected, where the first branch 21 may be an integral structure, which is beneficial to simplifying the manufacturing process of the antenna 300.
In other embodiments, the respective connection portions may be provided on opposite sides of the dielectric substrate 10. For example, the first connection portion 211 and the second connection portion 212 may be disposed on the first surface 11 of the dielectric substrate 10, and the third connection portion 213 and the fourth connection portion 214 may be disposed on the second surface (not shown) of the dielectric substrate 10, and in this case, the end of the second connection portion 212 and the head end of the third connection portion 213 may be electrically connected through a via hole. Alternatively, the first connection portion 211 and the third connection portion 213 may be disposed on the first surface 11 of the dielectric substrate 10, and the second connection portion 212 and the fourth connection portion 214 may be disposed on the second surface of the dielectric substrate 10, and in this case, the terminal end of the first connection portion 211 and the head end of the second connection portion 212, the terminal end of the second connection portion 212 and the head end of the third connection portion 213, and the terminal end of the third connection portion 213 and the head end of the fourth connection portion 214 may be electrically connected through a via. It should be noted that the specific setting positions of the connection portions are not limited to the two types listed above, and may be designed according to actual requirements during implementation, so long as it is ensured that sequential connection between the connection portions can be achieved, and redundant description is omitted herein.
It can be understood that when the connection portions are disposed on the same surface of the dielectric substrate 10, the first connection portion 211, the second connection portion 212, the third connection portion 213 and the fourth connection portion 214 are sequentially connected to form a structure similar to a split ring, and at this time, the opening of the split ring is the interval between the end of the fourth connection portion 214 and the head end of the first connection portion 211. When the connection portions are disposed on the first surface 11 and the second surface of the dielectric substrate 10, the projections of the first connection portion 211, the second connection portion 212, the third connection portion 213, and the fourth connection portion 214 on the first surface 11 of the dielectric substrate 10 are sequentially connected, and a structure similar to a split ring may be formed, where the opening of the split ring is a distance between the end of the fourth connection portion 124 and the projection of the head end of the first connection portion 211 on the first surface 11.
In some embodiments, the first connection portion 211 and the third connection portion 213 may be disposed along a first direction (i.e., an x-axis direction), and the second connection portion 212 and the fourth connection portion 214 may be disposed along a second direction (i.e., a y-axis direction), respectively. When the cross section of the dielectric substrate 10 is rectangular, the first direction may be the width direction of the dielectric substrate 10, and the second direction may be the length direction of the dielectric substrate 10, at this time, the first connection portion 211 is disposed opposite to the third connection portion 213, the second connection portion 212 is disposed opposite to the fourth connection portion 214, and the first branch is substantially in a rectangular split ring structure. The length of the second connection portion 212 may be between 75mm and 76mm, and illustratively, the length of the second connection portion 212 may be 75mm,75.5mm,76mm, etc. The length of the third connection portion 213 may be between 16.5mm and 17.5mm, and the length of the third connection portion 213 may be 16.5mm,17mm,17.5mm, or the like, for example. The length of the first connection portion 211 may be slightly smaller than that of the third connection portion 213, where a projection of the first end of the first connection portion 213 on the first projection plane is located between the first end and the tail end of the third connection portion 213, where the first projection plane may be understood as a plane where a surface of the third connection portion 213 facing the first connection portion 211 is located. The length of the fourth connecting portion 214 is smaller than that of the second connecting portion 212, and a projection of the end of the fourth connecting portion 214 on the second projection plane is located between the head end and the end of the second connecting portion 212, where the second projection plane can be understood as a plane where a surface of the second connecting portion 212 facing the fourth connecting portion 214 is located. For example, the projection of the end of the fourth connection portion 214 on the second projection plane may be disposed near the center region of the second connection portion 212.
In other embodiments, the first branch 21 may be a split ring with other shapes, such as a circle, an oblong shape, or other regular or irregular shapes, and specifically may be configured according to the shape of the substrate and the internal space of the terminal device, which will not be described herein.
The second branch 22 can be arranged on the first branch 21The opening of the split ring is formed, and the second stub 22 is disposed along the y-axis direction. The second branch 22 may be disposed on the first surface 11 of the dielectric substrate 10, or may be disposed on the second surface of the dielectric substrate 10, which is not limited in the present application. Taking the example that the second branch 22 and the first branch 21 are both arranged on the first surface 11 of the dielectric substrate 10, the second branch 22 is located between the first connecting portion 211 and the third connecting portion 213, the head end of the second branch 22 is close to the head end of the first connecting portion 211 and is spaced from the head end of the first connecting portion 211, the head end of the second branch 22 is connected with the inner conductor of the feed transmission line 30, and the head end of the second branch 22 is the feed end of the antenna 300; the end of the second branch 22 is located between the fourth connection portion 214 and the second connection portion 212, that is, the second branch 22 is located inside the split ring formed by the first branch 21, which makes the structure of the antenna 300 more compact; the end section of the second branch 22 is parallel to the end section of the fourth connecting portion 214, and a first gap d is provided between the end section of the second branch 22 and the end section of the fourth connecting portion 1 It can be appreciated that the first gap d 1 The width direction of (a) is the x-axis direction.
In other embodiments, the end of the second branch 22 may also be located on the side of the fourth connection portion 214 facing away from the second connection portion 212, i.e. the second branch 22 is located outside the split ring formed by the first branch 21. At this time, the end of the second branch 22 and the end of the fourth connecting portion 214 may be disposed in parallel, and a certain gap may be formed, and the width direction of the gap is also the x-axis direction.
In other embodiments, the second branch 22 and the fourth connecting portion 214 may also be located on the same line, where the end of the second branch 22 is spaced from the end of the fourth connecting portion 214, and the width direction of the gap between the end of the second branch 22 and the end of the fourth connecting portion 214 is the y-axis direction.
It can be appreciated that when the second branch 22 and the first branch 21 are disposed on different surfaces of the medium substrate 10, the projection of the second branch 22 and the first branch 21 on the first surface 11 of the medium substrate 10 can satisfy the above positional relationship.
Third branchThe node 23 may be disposed on the first surface 11 of the dielectric substrate 10 or may be disposed on the second surface of the dielectric substrate 10, which is not limited in the present application. Taking the first branch 21, the second branch 22 and the third branch 23 as examples, the third branch 23 may be located between the second branch 22 and the second connection portion 212, and the third branch 23 is also substantially disposed along the y-axis direction, so that the structure of the antenna 300 is more compact, which is beneficial to reducing the occupied space of the antenna 300 in the terminal device. The head end of the third branch 23 is connected to the head end of the second branch 22, i.e., the head end of the third branch 23 is also electrically connected to the inner conductor of the feeding transmission line 30. In some embodiments, the end of the third branch 23 is electrically connected to the second connection portion 212. Optionally, a second gap d is provided between the end of the third branch 23 and the second connecting portion 212 2 。
Similarly, when the third branch 23 and the first branch 21 or the second branch 22 are disposed on different surfaces of the medium substrate 10, the projection of the third branch 23 and the first branch 21 or the second branch 22 on the first surface 11 of the medium substrate 10 may satisfy the above positional relationship, and the head end of the third branch 23 and the head end of the second branch 22 may be electrically connected through a via.
The fourth branch 24 may be connected to the outer side of the second connection portion 212, and the extending direction of the fourth branch 24 may form a certain included angle with the first surface 11 of the dielectric substrate 10 or may be parallel to the first surface 11 of the dielectric substrate 10, which is not limited in the present application. For example, in the embodiment shown in fig. 2, the fourth branch 24 extends in a direction away from the first face 11 of the dielectric substrate 10, i.e. the direction in which the fourth branch 24 extends is perpendicular to the first face 11 of the dielectric substrate 10. The length of the fourth stub may be between 39.5mm and 40.5mm, and illustratively, the length of the fourth stub may be 39.5mm,40.2mm,40.5mm, and so on. The head end of the fourth branch 24 is connected to the second connection portion 212, and the tail end of the fourth branch 24 is connected to the ground member of the terminal device. Illustratively, the end of the fourth stub 24 may be grounded to the ground layer of the circuit board 200, and the antenna 300 may be supported on one side of the circuit board 200 by the fourth stub 24. Alternatively, the end of the fourth branch 24 may be connected to a metal component such as a radiator of the terminal device to be grounded.
In other embodiments, the fourth branch 24 may be connected to the inner side of the second connection portion 212, where the extending direction of the fourth branch 24 may be disposed at an angle with the first surface 11 of the dielectric substrate 10 or parallel to the first surface 11 of the dielectric substrate 10, which is not limited in the present application.
In addition, in the present embodiment, the number of the fourth branches 24 may be plural, and the plural fourth branches 24 may be arranged at intervals. In particular, the fourth branches 24 may be all connected to the inner side of the second connection portion 212, or may be all connected to the outer side of the second connection portion 212, or may be partially connected to the inner side of the second connection portion 212, or may be partially connected to the outer side of the second connection portion 212.
The antenna 300 provided in the embodiment of the present application adopts the feeding transmission line 30 to feed, the outer conductor of the feeding transmission line 30 is connected with the first branch, the inner conductor of the feeding transmission line 30 feeds the second branch 22 and the third branch 23, and the fourth branch 24 which is grounded and arranged on the first branch 21 is connected, so that four working modes can be generated, and the four working modes are respectively: 1) The ends of the first branch 21 and the second branch 22 are coupled to each other to form a left-right-hand composite antenna mode in which the antenna 300 may generate a first resonant frequency; 2) A 1/4 lambda mode of the fourth stub 24 to the end of the first stub 21 via the connection position of the first stub 21 and the fourth stub 24, in which mode the antenna 300 can generate a second resonant frequency; 3) The third branch 23 couples the first branch 21 with a feed, exciting a 3/4 lambda mode of the first branch 21 in which the antenna 300 may generate a third resonant frequency; 4) The coupling Loop of the first stub 21 and the second stub 22 creates a 1 lambda mode of a Loop-like antenna, in which mode the antenna 300 may create a fourth resonant frequency. Through the first three working modes, the antenna can meet the high-efficiency broadband coverage in the frequency range of 0.6 GHz-0.96 GHz, and through the fourth working mode, the antenna can meet the high-efficiency coverage in the frequency range of 1.4 GHz-1.6 GHz.
It should be noted that the right-hand and left-hand composite transmission line can be understood as a right-hand transmission line, and serial power is appliedAnd the capacitor and the inductor are combined to realize a left-handed working mode. Referring to fig. 3a, 3b and 3c together, fig. 3a is an equivalent circuit diagram of a right-hand transmission line, fig. 3b is an equivalent circuit diagram of a left-hand transmission line, and fig. 3c is an equivalent circuit diagram of a left-hand and right-hand composite transmission line. The right hand transmission line model can be expressed as a series inductance L R And a parallel capacitor C R Is a combination of (a) and (b). The left-hand material is realized by loading a series capacitor C in a conventional right-hand transmission line L And parallel inductance L L To achieve this, because of the unavoidable presence of parasitic series inductance and parallel capacitance in conventional transmission lines, this material is not a pure left-hand material, but a left-hand and right-hand composite material, i.e., a left-hand and right-hand composite transmission line, which can be modeled as represented by an inductance L R Series-connected a capacitor C L A capacitor C R Parallel-connected an inductance L L Combined to realize a left-hand working mode.
The following describes four operation modes of the antenna 300 specifically, taking the example that the first branch 21, the second branch 22, and the third branch 23 are all disposed on the first surface 11 of the dielectric substrate 10.
Referring to fig. 4 and 5 together, fig. 4 is a schematic diagram illustrating a current distribution situation of the antenna on the radiator in the first operation mode, and fig. 5 is a partial enlarged view of a portion a in fig. 4. In the first operation mode, the feed transmission line feeds the rf current signal to the antenna 300 through the head end of the second branch 22 via 30, and the first gap d is formed between the end section of the second branch 22 and the end section of the first branch 21 (i.e. the end section of the fourth connection portion 214) 1 Forming a distributed capacitive coupling structure, the current signal on the second branch 22 can pass through the first gap d 1 Coupled to the first branch 21, current flows on an approximately annular branch formed by the second branch 22 and the first branch 21 (shown by solid arrows in fig. 4), so as to form a left-right hand composite antenna mode, at this time, the tail end of the first branch 21 and the tail end of the second branch 22 can be equivalently a series capacitor, and the whole first branch 21 can be equivalently a parallel inductor, thereby realizing a left-right hand composite antenna mode and miniaturization of the antenna. It can be seen that the current is always in the same direction from the first branch 21 to the second branch 22And the current amplitude is not changed obviously except the tail end of the branch. In addition, in this mode, the fourth branch 24 is weak in current, and the fourth branch 24 may function as a distributed inductor, which does not affect the generation of this mode.
With continued reference to fig. 4 and 5, in this embodiment, the resonant frequency of the antenna in the left-right hand composite antenna mode may be defined by f=c/λ, andtwo formulas are determined, wherein f is the resonant frequency, C is the signal wave velocity, lambda is the wavelength, L is the equivalent inductance of the left-right hand composite antenna, and C is the equivalent capacitance of the left-right hand composite antenna. It can be understood that the wavelength λ is related to the length of the approximate annular branch formed by the second branch 22 and the first branch 21, and the equivalent capacitance C is related to the coupling amount of the first branch 21 and the second branch 22, so that it can be seen that the resonant frequency f in the left-right-hand composite antenna mode is mainly determined by the length of the approximate annular branch formed by the first branch 21 and the second branch 22 and the coupling amount of the first branch 21 and the second branch 22, so that the adjustment of the resonant frequency can be achieved by changing the length of the annular branch and the coupling amount of the first branch 21 and the second branch 22.
The length of the loop branch is approximately the sum of the length of the first branch 21 and the length of the second branch 22, so that the resonant frequency f in the left-right hand composite antenna mode can be shifted to a low frequency according to f=c/λ by increasing the length of the first branch 21, or by increasing the length of the second branch 22, or by increasing the lengths of the first branch 21 and the second branch 22 together; conversely, decreasing the length of the first branch 21, or decreasing the length of the second branch 22, or decreasing both the lengths of the first branch 21 and the second branch 22, can shift the resonant frequency f in the left-right-hand composite antenna mode to a high frequency offset. In addition, when the length of the first branch 21 is increased or decreased, it may be achieved by adjusting the length of one or more of the first connection portion 211, the second connection portion 212, the third connection portion 213, and the fourth connection portion 214.
The coupling amount of the first branch 21 and the second branch 22 can be determined by the coupling lengthAnd coupling gap characterization, it can be understood that the larger the coupling length is, the larger the equivalent capacitance C is, and the smaller the coupling length is, the smaller the equivalent capacitance C is; the larger the coupling gap, the smaller the equivalent capacitance C, and the larger the coupling gap, the smaller the equivalent capacitance C. According toIncreasing the relative length l of the end section of the fourth connecting portion 214 to the end section of the second stub 22 1 I.e. the coupling length, the resonant frequency f of the left-hand and right-hand composite antenna modes can be shifted to low frequency; conversely, the relative length l of the end section of the fourth connecting portion 214 to the end section of the second branch 22 is reduced 1 The resonant frequency f of the left-right hand composite antenna mode can be shifted to a high frequency. And, increasing a first gap d between a distal end section of the fourth connecting portion 214 and a distal end section of the second branch 22 1 I.e., the coupling gap, can be set to the resonant frequency f of the left-right hand composite antenna mode to Gao Pinpian; conversely, the first gap d between the end section of the fourth connecting portion 214 and the end section of the second branch 22 is reduced 1 The resonance frequency f of the left-right hand composite antenna mode can be shifted to a low frequency offset.
In some embodiments, offsetting the fourth connection 214 toward the direction proximate to the second branch 22, or offsetting the second branch 22 toward the direction proximate to the fourth connection 214, or offsetting the fourth connection 214 along with the second branch 22, may reduce the first gap d between the end of the fourth connection 214 and the end of the second branch 22 1 The method comprises the steps of carrying out a first treatment on the surface of the Offsetting the fourth connection portion 214 in a direction away from the second branch 22, or offsetting the second branch 22 in a direction away from the fourth connection portion 214, or offsetting the fourth connection portion 214 together with the second branch 22 may increase the first gap d between the end of the fourth connection portion 214 and the end of the second branch 22 1 。
In other embodiments, the end of the fourth connecting portion 214 may further be provided with a first protruding portion 2141, where the first protruding portion 2141 is located on the side of the fourth connecting portion 214 facing the second branch 22, and may be used to adjust the impedance matching of the antenna 300, so as to facilitate the antenna 300 to obtain a better performanceHigh gain. In addition, with this structure, the first gap d between the end section of the fourth connecting portion 214 and the end section of the second branch 22 can be adjusted by increasing or decreasing the width of the first protruding portion 2141 in the x-axis direction at the design stage 1 Thus, the design difficulty of the antenna can be reduced.
In some embodiments, a second protruding portion 221 may be disposed at a distal end of the second branch 22, where the second protruding portion 221 is located on a side of the second branch 22 facing away from the fourth connecting portion 214. Similarly, the second protrusion 221 may also be used to adjust the impedance matching of the antenna 300, so that the antenna 300 obtains a higher gain, and when specifically configured, the length of the second protrusion 221 along the y-axis direction may be greater than the relative length l of the first branch 21 and the second branch 22 1 。
Through testing, the first resonant frequency of the antenna 300 in the first operation mode (left-right hand composite antenna mode) may be approximately tuned to 0.7GHz to 0.8GHz.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating a current distribution situation of the antenna on the radiator in the second operation mode. In the second operation mode, current flows between the fourth branch 24 and the connection position m of the first branch 21 to the end of the first branch 21, forming a 1/4 lambda pattern from the fourth branch 24 to the end of the first branch 21 through the connection position m. It will be appreciated that the length of the fourth stub 24 and the electrical length from the connection location m to the end of the first stub 21 are one quarter of the signal wavelength of the mode. The thickness of the solid arrows in fig. 6 is used to characterize the magnitude of the current, and it can be seen from fig. 6 that the current is larger in the fourth branch 24 and the current is weakest to the end of the first branch 21, conforming to the current distribution of the 1/4 lambda mode.
It should be noted that the electrical length is understood to be the ratio of the physical length of the transmission line to the wavelength of the transmitted signal, and in the embodiment of the present application, the physical length of the transmission line is the sum of the length of the fourth branch 24 and the length from the connection position m to the end of the first branch 21.
In this embodiment, the resonant frequency of the antenna 300 in the 1/4 λ mode may be determined by f=c/λ. The wavelength λ is related to the length of the fourth branch 24 and the length from the connection position m to the end of the first branch 21, so that increasing the length of the fourth branch 24, or increasing the length from the connection position m to the end of the first branch 21, or increasing the lengths of both parts, can make the resonant frequency f in the 1/4 λ mode shift toward low frequency; conversely, decreasing the length of the fourth stub 24, or decreasing the length of the connection position m to the end of the first stub 21, or decreasing both portions together, can shift the resonance frequency f in the 1/4 λ mode to a high frequency offset.
In other embodiments, the fourth branch 24 is moved toward the first branch 21, that is, the connection position m is moved toward the first branch 21, and the length from the connection position m to the end of the first branch 21 may be increased, so that the resonance frequency f in the 1/4 lambda mode may be shifted toward a low frequency offset; conversely, moving the fourth branch 24 in a direction approaching the third branch 23, that is, moving the connection position m in a direction approaching the third branch 23, the length of the connection position m to the end of the first branch 21 can be reduced, and the resonance frequency f in the 1/4 λ mode can be shifted to a high frequency offset.
Through testing, the second resonant frequency of the antenna 300 in the second operation mode (1/4 lambda mode from the connection position m of the fourth branch to the end of the first branch through the first branch) may be approximately tuned to 0.7 GHz-0.8 GHz.
Referring to fig. 7 and 8 together, fig. 7 is a schematic diagram illustrating a current distribution situation of the antenna on the radiator in the third operation mode, and fig. 8 is a partial enlarged view at B in fig. 7. In the third operation mode, the feeding transmission line 30 feeds the antenna 300 with a radio frequency current signal through the head end of the third branch 23, and the tail end of the third branch 23 couples and feeds the first branch 21 near the position n, so as to excite the 3/4 lambda mode of the first branch 21. It will be appreciated that the electrical length of the first stub 21 is approximately three-quarters of the signal wavelength λ of the mode. In a specific design, the electrical length between the position n and the head end of the first branch 21 is approximately one third of the overall electrical length of the first branch 21, the head end of the first branch 21 is a current big point, and the current reaches a current small point (i.e. the position n) through 1/4λ, reaches a current big point (i.e. the position o on the third connecting portion) through 1/4λ, and finally reaches a current small point (i.e. the tail end of the first branch) through 1/4λ, so as to meet the current distribution of the 3/4λ mode.
In the embodiment of the present application, the third branch 23 may include a first branch 231, a second branch 232, a third branch 233 and a fourth branch 234, and when the arrangement is specifically performed, the first branch 231 may be disposed along a first direction, the first branch 231 is located at a side of the second branch 22 facing the second connection portion 212 of the first branch 21, a head end of the first branch 231 is connected with a head end of the second branch 22 and an inner conductor of the feeding transmission line 30, and a tail end of the first branch 231 is connected with a head end of the second branch 232; the second branch 232 may be disposed along the second direction, and the second branch 232 is disposed at intervals with the second connection portion 212 of the second branch 22 and the first branch 21, respectively, and when the second branch 232 is specifically disposed, the interval between the second branch 232 and the second connection portion 212 may be not less than 0.025 λ; the third branch 233 is arranged along the first direction, the third branch 233 is positioned at one side of the second branch 232 close to the second connecting part 212 of the first branch 21, the head end of the third branch 233 is connected with the tail end of the second branch 232, and the tail end of the third branch 233 is connected with the head end of the fourth branch 234; the fourth branch 234 is disposed along the second direction, and a second gap d is formed between the fourth branch 234 and the second connecting portion 212 of the first branch 21 2 The fourth branch 234 and the second connecting portion pass through a second gap d 2 Forming a distributed capacitive coupling structure, the current signal on the third branch 23 can pass through the second gap d 2 Is coupled to the first stub 21 so as to excite a 3/4 lambda mode of the first stub 21.
In some embodiments, in order to achieve a better coupling effect, the midpoint n ' of the fourth branch 234 is disposed opposite to the position n, that is, the projection of the midpoint n ' of the fourth branch on the second projection plane coincides with the position n, or it can be understood that the position n is the projection point of the midpoint n ' of the fourth branch on the second projection plane.
With continued reference to fig. 7 and 8, in this embodiment, the resonant frequency of the antenna in the 3/4 λ mode may be defined by f=c/λ, andtwo formulasAnd (5) determining. Where the wavelength λ is related to the length of the first branch 21, L is an equivalent inductance of the antenna 300 when operating in the 3/4λ mode, and C is an equivalent capacitance of the antenna when operating in the 3/4λ mode, it is understood that the equivalent capacitance C is related to the coupling amounts of the first branch 21 and the third branch 23. It can be seen that the resonant frequency of the antenna 300 in the 3/4 lambda mode is mainly determined by the length of the first stub 21 and the coupling amount of the first stub 21 and the third stub 23. />
In a specific design, according to f=c/λ, the length of the first branch 21 is increased, so that the resonant frequency f in the 3/4 λ mode can be shifted to a low frequency; conversely, decreasing the length of the first stub 21 may shift the resonance frequency f in the 3/4 lambda mode to a high frequency offset.
The coupling amount of the first branch 21 and the third branch 23 can be characterized by a coupling length and a coupling gap, wherein the coupling length is the length of the fourth branch 234 of the third branch 23, and the coupling gap is the second gap d between the fourth branch 234 of the third branch 23 and the second connecting portion 212 of the first branch 21 2 . According toIncreasing the length l of the fourth branch 234 2 The resonant frequency f in the 3/4 lambda mode can be caused to shift to low frequency; conversely, decreasing the length of the fourth branch 234 may shift the resonant frequency f in the 3/4 lambda mode to a higher frequency offset. And, increasing the second gap d between the fourth branch 234 and the second connection 212 2 The resonance frequency f in the 3/4 lambda mode can be made to be Gao Pinpian; conversely, the second gap d between the fourth branch 234 and the second connection 212 is reduced 2 The resonant frequency f in the 3/4 lambda mode can be made to be low frequency offset.
In a specific design, increasing the length of the first branch 231 or the third branch 233 of the third branch 23 can offset the fourth branch 234 toward the direction approaching the second connection portion 212, and reduce the third gap d between the fourth branch 234 and the second connection portion 212 2 The method comprises the steps of carrying out a first treatment on the surface of the Decreasing the length of the first branch 231 or the third branch 233 of the third branch 23 may shift the fourth branch 234 in a direction away from the second connection portion 212, increasing the fourth branch 234 and the second branch Second gap d between connecting portions 212 2 。
In some embodiments, a second gap d between the fourth branch 234 and the second connection 212 2 May be between 0.001 lambda and 0.025 lambda, for example, the second gap d 2 May be 0.001 lambda, 0.005 lambda, 0.01 lambda, 0.015 lambda, 0.02 lambda, 0.025 lambda, etc.
The third resonant frequency of the antenna 300 in the third mode of operation (3/4 lambda mode of the first stub) was tested to be approximately tuned to 0.8GHz to 0.96GHz.
Referring to fig. 9, fig. 9 is a schematic diagram showing a current distribution of the antenna on the radiator in the fourth operation mode. In the fourth mode of operation, current flows on the approximately annular branch formed by the second branch 22 and the first branch 21, forming a 1λ mode of the Loop-like antenna. It will be appreciated that the sum of the length of the first stub 21 and the length of the second stub 22 is approximately equal to the signal wavelength λ of the mode. It can be seen that there is a large current point near the head end of the first branch 21, the current is reversed at this point through 1/4λ to a small current point (position p on the second connection portion), then through 1/4λ to a large current point (position q on the third connection portion 213), then through 1/4λ to a small current point (position r on the fourth connection portion 214), where the current is reversed again, and the current flows to the second branch 22 based on the coupling connection relationship of the end of the first branch 21 and the end of the second branch 22, and reaches the head end of the second branch 22 after approximately passing 1/4λ. That is, two large current points and two small current points exist on the annular branch, and the adjacent large current points and the adjacent small current points are separated by 1/4 lambda and accord with the current distribution of a 1 lambda mode.
In the present embodiment, the resonant frequency of the antenna 300 in the 1λ mode of the above-described loop stub may be determined by f=c/λ. The wavelength λ is related to the length of the first branch 21 and the length of the second branch 22, so that the resonant frequency f in the 1λ mode can be shifted toward low frequency by increasing the length of the first branch 21, or by increasing the length of the second branch 22, or by increasing the lengths of the first branch 21 and the second branch 22; conversely, decreasing the length of the first branch 21, or decreasing the length of the second branch 22, or decreasing the lengths of the first branch 21 and the second branch 22 together, the resonance frequency f in the 1λ mode may be shifted to a high frequency offset.
The fourth resonant frequency of the antenna 300 may be tested to be approximately tuned to 1.427GHz-1.517GHz in a fourth mode of operation (a 1λ mode of the Loop-like antenna produced by the coupling Loop of the first branch and the second branch).
Referring to fig. 10, fig. 10 is an S-parameter graph of an antenna according to an embodiment of the present application. It should be noted that the S parameter is a scattering parameter, and S1,1 is an input reflection coefficient, that is, an input return loss, which indicates how much energy is reflected back to the source. The antenna provided by the embodiment of the application can simultaneously generate a left-right hand composite antenna mode, a 1/4 lambda mode from the connection position of the fourth branch to the tail end of the first branch through the first branch and the fourth branch, and a 3/4 lambda mode of the first branch, and can generate three resonances of 1 (0.61 GHz), 2 (0.77 GHz) and 3 (0.96 GHz) through the three modes, thereby realizing continuous coverage within the frequency range of 0.6 GHz-0.96 GHz, widening the working frequency range of terminal equipment and improving the working performance of the terminal equipment. In addition, the antenna also has a 1 lambda mode of the Loop-like antenna generated by the coupling rings of the first branch and the second branch, resonance 4 (resonance frequency 1.48 GHz) can be generated by the antenna in the mode, and coverage in a frequency band of 1.427GHz-1.517GHz is realized, so that the antenna can also transmit and receive signals in the frequency band, and the application scene of terminal equipment is widened.
Referring to fig. 11 together, fig. 11 is an antenna efficiency graph of an antenna according to an embodiment of the present application. It can be seen that the antenna efficiency is higher than-4 dB in the frequency band of 0.6 GHz-0.7 GHz; the antenna efficiency is higher than-3 dB in the frequency band of 0.7 GHz-0.96 GHz; at the frequency band of 1.427GHz-1.517GHz, the antenna efficiency is higher than-3 dB.
Referring to fig. 12, fig. 12 is an S-parameter graph after antenna tuning according to an embodiment of the present application. In the first three working modes of the antenna, the method for debugging the resonant frequency of each mode in the previous embodiment is combined, S1,1 & lt 6dB can be met in the frequency band of 0.6 GHz-1.3 GHz, and the relative bandwidth (namely the ratio of the signal bandwidth to the center frequency) reaches 73.6%. Referring to fig. 13, fig. 13 is a graph of antenna efficiency after antenna debugging according to an embodiment of the present application, it can be seen that, in a frequency band of 0.6GHz to 0.7GHz, the antenna efficiency is higher than-4 dB; the antenna efficiency is higher than-3 dB in the frequency band of 0.7 GHz-1.3 GHz.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (14)
1. The utility model provides an antenna, its characterized in that includes dielectric substrate, radiator, feed end and earthing terminal, the radiator set up in on the dielectric substrate, the radiator includes first branch, second branch, third branch and fourth branch, wherein:
the first branch is in an open ring shape, and the head end of the first branch is electrically connected with the grounding end;
the head end of the second branch is electrically connected with the feed end, and the tail end of the second branch is coupled with the tail end of the first branch;
the head end of the third branch is electrically connected with the feed end, and the tail end of the third branch is coupled with the first branch;
the first end of the fourth branch is connected with the first branch, and the tail end of the fourth branch is grounded.
2. The antenna of claim 1, wherein the first branch comprises a first connection portion, a second connection portion, a third connection portion and a fourth connection portion which are sequentially connected, wherein an opening forming the opening ring is formed between an end of the first connection portion and an end of the fourth connection portion, the end of the first connection portion is a head end of the first branch, and the end of the fourth connection portion is a tail end of the first branch.
3. The antenna of claim 2, wherein the first connection portion and the third connection portion are disposed in parallel, and the first connection portion and the third connection portion extend in a first direction, respectively; the second connecting portion and the fourth connecting portion are arranged in parallel, and extend along a second direction respectively, and the second direction is different from the first direction.
4. The antenna of claim 3, wherein the second stub extends in the second direction, an end section of the second stub being disposed opposite an end section of the fourth connection portion and having a first gap.
5. The antenna of claim 4, wherein a distal end of the fourth connection portion is provided with a first protrusion, the first protrusion being located on a side of the fourth connection portion facing the second stub.
6. The antenna of claim 4, wherein a distal end of the second stub is provided with a second protrusion, the second protrusion being located on a side of the second stub facing away from the fourth connection portion.
7. The antenna according to any one of claims 3 to 6, wherein the third branch includes a first branch, a second branch, a third branch, and a fourth branch that are connected in this order, the first branch being disposed along the first direction, and the first branch being located on a side of the second branch that is close to the second connection portion; the second branch extends along the second direction; the third branch extends along the first direction, and is positioned at one side of the second branch close to the second connecting part; the fourth branch extends along the second direction, and a second gap is formed between the fourth branch and the second connecting portion.
8. The antenna of claim 7, wherein a midpoint of the fourth branch has a projected point on a side of the second connection portion facing the fourth connection portion, and an electrical length between the projected point and the first connection portion is 1/3 of an electrical length of the first branch.
9. The antenna of any one of claims 1-6, wherein the first stub, the second stub, and the third stub are disposed on a first side of the dielectric substrate.
10. The antenna according to any one of claims 1 to 6, wherein the fourth stub is provided to extend in a thickness direction of the dielectric substrate.
11. The antenna of any one of claims 1-6, wherein the antenna produces a first resonant frequency with the first stub and the second stub;
the antenna generates a second resonant frequency through the fourth branch and the first branch;
the antenna generates a third resonant frequency through the third branch and the first branch;
the antenna generates a fourth resonant frequency through the first stub and the second stub.
12. The antenna of claim 11, wherein the first resonant frequency is 0.6GHz to 0.7GHz, the second resonant frequency is 0.7GHz to 0.8GHz, the third resonant frequency is 0.8GHz to 0.96GHz, and the fourth resonant frequency is 1.427GHz to 1.517GHz.
13. A terminal device comprising a circuit board, a feed transmission line and an antenna according to any one of claims 1 to 12, wherein the circuit board is provided with a radio frequency transceiver circuit, one end of the feed transmission line is connected to the radio frequency transceiver circuit, and the other end is connected to the feed terminal.
14. The terminal device of claim 13, wherein the circuit board includes a ground layer, and wherein an end of the fourth stub is connected to the ground layer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110172915.0A CN114914665B (en) | 2021-02-08 | 2021-02-08 | Antenna and terminal equipment |
| PCT/CN2021/139882 WO2022166444A1 (en) | 2021-02-08 | 2021-12-21 | Antenna and terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110172915.0A CN114914665B (en) | 2021-02-08 | 2021-02-08 | Antenna and terminal equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114914665A CN114914665A (en) | 2022-08-16 |
| CN114914665B true CN114914665B (en) | 2023-09-22 |
Family
ID=82740828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110172915.0A Active CN114914665B (en) | 2021-02-08 | 2021-02-08 | Antenna and terminal equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114914665B (en) |
| WO (1) | WO2022166444A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115528423B (en) * | 2022-10-24 | 2024-05-24 | 浙江金乙昌科技股份有限公司 | Small combined antenna and antenna array based on tight coupling and defected ground structure |
| CN115621717B (en) * | 2022-11-28 | 2023-03-21 | 小米汽车科技有限公司 | Radiator, antenna unit, antenna assembly, vehicle and arranging method |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2650963A1 (en) * | 2012-04-09 | 2013-10-16 | HTC Corporation | Mobile device and manufacturing method thereof |
| CN104852149A (en) * | 2015-04-16 | 2015-08-19 | 中国计量学院 | Miniaturized mobile phone antenna covering various navigation frequency bands, and mobile phone |
| CN107317104A (en) * | 2017-06-27 | 2017-11-03 | 普联技术有限公司 | A kind of antenna assembly and Wireless Telecom Equipment |
| EP3246989A1 (en) * | 2015-02-11 | 2017-11-22 | Huawei Technologies Co. Ltd. | Multi-frequency antenna and terminal device |
| WO2018082558A1 (en) * | 2016-11-01 | 2018-05-11 | 中兴通讯股份有限公司 | Antenna and communication terminal |
| CN207781885U (en) * | 2017-12-22 | 2018-08-28 | 歌尔科技有限公司 | A kind of multiband antenna and electronic equipment |
| CN208589540U (en) * | 2018-07-03 | 2019-03-08 | 深圳市信维通信股份有限公司 | A kind of LTE band antenna structure for small device |
| CN110034397A (en) * | 2019-04-24 | 2019-07-19 | 北京邮电大学 | A kind of MIMO handset antenna radiation unit and MIMO antenna for mobile phone |
| CN110380189A (en) * | 2019-07-23 | 2019-10-25 | 广东以诺通讯有限公司 | A kind of miniature antenna and terminal |
| CN110676574A (en) * | 2014-02-12 | 2020-01-10 | 华为终端有限公司 | Antenna and mobile terminal |
| CN110718749A (en) * | 2019-10-25 | 2020-01-21 | 广东工业大学 | Miniaturized multi-frequency planar inverted F antenna |
| CN111326857A (en) * | 2020-03-03 | 2020-06-23 | 普联技术有限公司 | Multi-frequency antenna structure and communication equipment |
| CN210897620U (en) * | 2019-12-30 | 2020-06-30 | 西安易朴通讯技术有限公司 | Double-parasitic antenna assembly and electronic equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI359530B (en) * | 2008-05-05 | 2012-03-01 | Acer Inc | A coupled-fed multiband loop antenna |
| US9450291B2 (en) * | 2011-07-25 | 2016-09-20 | Pulse Finland Oy | Multiband slot loop antenna apparatus and methods |
| CN107104276B (en) * | 2017-04-11 | 2019-06-21 | 惠州Tcl移动通信有限公司 | Back feedback manifold type folded coil antenna and mobile terminal |
| CN107565209B (en) * | 2017-07-31 | 2020-10-16 | 北京小米移动软件有限公司 | Mobile terminal and antenna thereof |
| CN207852905U (en) * | 2017-12-29 | 2018-09-11 | 中国移动通信集团设计院有限公司 | A kind of LTE antenna and mobile terminal |
| CN109462016A (en) * | 2018-09-29 | 2019-03-12 | Oppo广东移动通信有限公司 | Antenna assembly and electronic equipment |
| WO2020167627A1 (en) * | 2019-02-13 | 2020-08-20 | Sony Corporation | Systems and devices for multi-antenna solutions |
-
2021
- 2021-02-08 CN CN202110172915.0A patent/CN114914665B/en active Active
- 2021-12-21 WO PCT/CN2021/139882 patent/WO2022166444A1/en active Application Filing
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2650963A1 (en) * | 2012-04-09 | 2013-10-16 | HTC Corporation | Mobile device and manufacturing method thereof |
| CN110676574A (en) * | 2014-02-12 | 2020-01-10 | 华为终端有限公司 | Antenna and mobile terminal |
| EP3246989A1 (en) * | 2015-02-11 | 2017-11-22 | Huawei Technologies Co. Ltd. | Multi-frequency antenna and terminal device |
| CN104852149A (en) * | 2015-04-16 | 2015-08-19 | 中国计量学院 | Miniaturized mobile phone antenna covering various navigation frequency bands, and mobile phone |
| WO2018082558A1 (en) * | 2016-11-01 | 2018-05-11 | 中兴通讯股份有限公司 | Antenna and communication terminal |
| CN107317104A (en) * | 2017-06-27 | 2017-11-03 | 普联技术有限公司 | A kind of antenna assembly and Wireless Telecom Equipment |
| CN207781885U (en) * | 2017-12-22 | 2018-08-28 | 歌尔科技有限公司 | A kind of multiband antenna and electronic equipment |
| CN208589540U (en) * | 2018-07-03 | 2019-03-08 | 深圳市信维通信股份有限公司 | A kind of LTE band antenna structure for small device |
| CN110034397A (en) * | 2019-04-24 | 2019-07-19 | 北京邮电大学 | A kind of MIMO handset antenna radiation unit and MIMO antenna for mobile phone |
| CN110380189A (en) * | 2019-07-23 | 2019-10-25 | 广东以诺通讯有限公司 | A kind of miniature antenna and terminal |
| CN110718749A (en) * | 2019-10-25 | 2020-01-21 | 广东工业大学 | Miniaturized multi-frequency planar inverted F antenna |
| CN210897620U (en) * | 2019-12-30 | 2020-06-30 | 西安易朴通讯技术有限公司 | Double-parasitic antenna assembly and electronic equipment |
| CN111326857A (en) * | 2020-03-03 | 2020-06-23 | 普联技术有限公司 | Multi-frequency antenna structure and communication equipment |
Non-Patent Citations (3)
| Title |
|---|
| Printed loop antenna with an inductively coupled branch strip for small-size LTE/WWAN tablet computer antenna;Meng-Ting Chen等;2013 Proceedings of the International Symposium on Antennas & Propagation;全文 * |
| 一种小型化移动终端全网通天线;官伯然;张胜杰;;电波科学学报(第03期);全文 * |
| 一种小型化移动终端全网通天线;官伯然等;《电波科学学报》;20160301(第03期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114914665A (en) | 2022-08-16 |
| WO2022166444A1 (en) | 2022-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100893738B1 (en) | Surface-mounted antenna and communications apparatus comprising same | |
| KR101492850B1 (en) | Single-layer metallization and via-less metamaterial structures | |
| EP2416444B1 (en) | Multiple-input multiple-output (MIMO) multi-band antennas with a conductive neutralization line for signal decoupling | |
| US7330155B2 (en) | Antenna system | |
| US7714795B2 (en) | Multi-band antenna apparatus disposed on a three-dimensional substrate, and associated methodology, for a radio device | |
| US8711051B2 (en) | Antenna device and wireless communication apparatus | |
| US20070152881A1 (en) | Multi-band antenna system | |
| US7265726B2 (en) | Multi-band antenna | |
| JPWO2004036687A1 (en) | Small multi-mode antenna and high-frequency module using the same | |
| US20190280383A1 (en) | Apparatus with Partitioned Radio Frequency Antenna and Matching Network and Associated Methods | |
| WO2008000175A1 (en) | Miniature balanced antenna with differential feed | |
| CN114914665B (en) | Antenna and terminal equipment | |
| CN101276955A (en) | Antenne apparatus and associated methodology for a multi-band radio device | |
| WO2013175903A1 (en) | Antenna device and mimo wireless device | |
| WO2013051188A1 (en) | Antenna device and wireless communication device | |
| JP2005535239A (en) | Dual band antenna system | |
| WO2015096132A1 (en) | Antenna and terminal | |
| CN113224503A (en) | Antenna and terminal equipment | |
| CN113675608B (en) | Antenna system and wireless device | |
| JPWO2013051187A1 (en) | ANTENNA DEVICE AND WIRELESS COMMUNICATION DEVICE | |
| JP2023543278A (en) | antenna device, array of antenna devices | |
| JP2022517570A (en) | Radiation enhancer for radio equipment, radiation system and radio equipment | |
| WO2023273607A1 (en) | Antenna module and electronic device | |
| CN115133269A (en) | Antenna assembly and electronic equipment | |
| CN114824768B (en) | Loop antenna and TWS earphone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |