CN104466399B - Method, the mobile terminal of a kind of microstrip antenna and its filtering interference signals - Google Patents
Method, the mobile terminal of a kind of microstrip antenna and its filtering interference signals Download PDFInfo
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- CN104466399B CN104466399B CN201310433345.1A CN201310433345A CN104466399B CN 104466399 B CN104466399 B CN 104466399B CN 201310433345 A CN201310433345 A CN 201310433345A CN 104466399 B CN104466399 B CN 104466399B
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- 239000000758 substrate Substances 0.000 claims abstract description 38
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- 230000010354 integration Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/40—Element having extended radiating surface
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Abstract
The invention discloses a kind of microstrip antennas, including medium substrate, monopole radiation patch and microstrip feed line, wherein, the monopole radiation patch is printed on a side surface of the medium substrate, annular groove is provided in the monopole radiation patch, the annular groove forms complementary slotted ring resonator with the endless metal belt adhered on the medium substrate relative to another side surface of the monopole radiation patch, is used for filtering interference signals；The microstrip feed line is connect with the monopole radiation patch, is fed for microstrip antenna；The present invention also discloses the methods and mobile terminal of a kind of microstrip antenna filtering interference signals, it can satisfy multifrequency, the ultra wide band demand of antenna using the present invention program, interference problem between bring antenna when efficiently solving other data services of successive bands transmitting, while reducing the area of antenna.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a microstrip antenna, a method for filtering interference signals by the microstrip antenna and a mobile terminal.
Background
With the development of wireless communication technology, mobile terminals tend to be miniaturized, low-cost, ultra-thin and fashionable in appearance, and meanwhile, the mobile terminals are required to be compatible with multiple communication standards at the same time, and high performance is required. Therefore, it is a difficult problem in the industry to design an antenna that can meet the requirements of both the structure and the client, and also the performance index of the antenna.
The planar antenna has the advantages of light weight, small volume, low profile, easy integration, low cost, easy manufacture and the like, and can meet the requirement of mobile terminal equipment on the volume of the antenna, but the antenna needs to be compatible with a plurality of communication standards simultaneously and is not interfered by data services of other frequency bands, so that the interference of adjacent frequency bands needs to be improved by some measures.
Disclosure of Invention
The invention mainly provides a microstrip antenna, a method for filtering interference signals by the microstrip antenna and a mobile terminal, which can meet the requirements of multi-frequency and ultra-wide band, effectively solve the problem of interference between antennas caused by the emission of other data services of adjacent frequency bands and reduce the area of the antennas.
The technical scheme of the invention is realized as follows:
the present invention provides a microstrip antenna, including: a dielectric substrate, a monopole radiation patch and a microstrip feed line, wherein,
the monopole radiation patch is printed on the surface of one side of the dielectric substrate;
the monopole radiation patch is provided with an annular groove, and the annular groove and a metal annular band attached to the surface of the medium substrate on the other side opposite to the monopole radiation patch form a complementary split ring resonator for filtering interference signals;
the microstrip feeder line is connected with the monopole radiation patch and used for feeding the microstrip antenna.
In the above scheme, the dielectric substrate includes at least one layer of dielectric, and the metal ring belt is attached to the first layer of dielectric surface of the dielectric substrate.
In the above solution, the respective electrical lengths of the annular groove and the metal ring band are equal to half wavelengths of signals with different frequencies, and have different resonant frequencies respectively;
and a third resonant frequency is coupled between the metal annular band and the annular groove.
In the above scheme, the monopole radiation patch is rectangular, circular, polygonal or circular.
In the above scheme, the annular groove and the metal ring belt are circular or square.
The invention also provides a method for filtering the interference signal by the microstrip antenna, which comprises the following steps:
the monopole radiation patch is provided with an annular groove, the annular groove and a metal annular band attached to the surface of the medium substrate on the other side opposite to the monopole radiation patch form a complementary split ring resonator, and interference signals are filtered by the complementary split ring resonator.
In the above scheme, the method further comprises: and the complementary split ring resonator filters interference signals of three frequency bands, and determines the lengths and the intervals of the annular groove and the metal annular band according to the frequency bands of the three interference signals.
The invention also provides a mobile terminal, which comprises any one of the microstrip antennas.
The invention provides a microstrip antenna and a method for filtering interference signals thereof, and a mobile terminal, wherein the microstrip antenna comprises a dielectric substrate, a monopole radiation patch and a microstrip feeder line, wherein the monopole radiation patch is printed on the surface of one side of the dielectric substrate, an annular groove is formed on the monopole radiation patch, and a complementary split ring resonator is formed by the annular groove and a metal annular band which is attached to the surface of the dielectric substrate, which is opposite to the surface of the monopole radiation patch, on the other side for filtering the interference signals; the microstrip feeder line is connected with the monopole radiation patch and used for feeding a microstrip antenna; so, can produce three resonant frequency through complementary split ring resonator, can satisfy the demand of multifrequency, ultra wide band promptly, again can the filtering interference signal frequency to the size of antenna has effectively been reduced.
Drawings
Fig. 1 is a schematic structural diagram of a microstrip antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a surface on which monopole radiation patches of a microstrip antenna are located according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a surface on which a metal loop of a microstrip antenna is located according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a microstrip antenna of a mobile terminal according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a method for filtering an interference signal by a microstrip antenna according to an embodiment of the present invention;
fig. 6 is a return loss curve diagram of a microstrip antenna according to an embodiment of the present invention.
Detailed Description
In the embodiment of the invention, a mobile terminal is provided with a microstrip antenna comprising a dielectric substrate, a monopole radiation patch and a microstrip feeder line, wherein the monopole radiation patch is printed on the surface of one side of the dielectric substrate, an annular groove is formed on the monopole radiation patch, and the annular groove and a metal annular band attached to the surface of the dielectric substrate, which is opposite to the surface of the other side of the monopole radiation patch, form a complementary split ring resonator for filtering interference signals; the microstrip feeder line is connected with the monopole radiation patch and used for feeding the microstrip antenna.
The implementation of the technical solution is further described in detail by the figures and the specific embodiments.
Fig. 1 is a schematic structural diagram of a microstrip antenna implemented in an embodiment of the present invention, and as shown in fig. 1, the microstrip antenna includes: the monopole radiating patch comprises a monopole radiating patch 1, a dielectric substrate 3 and a microstrip feeder line 4; wherein,
the monopole radiation patch 1 is printed on one side surface of the dielectric substrate 3;
an annular groove 2 is formed in the monopole radiation patch 1, and the annular groove 2 and a metal annular band 5 attached to the surface of the medium substrate 3, which is opposite to the other side of the monopole radiation patch 1, form a complementary split ring resonator for filtering interference signals;
the microstrip feeder line 4 is connected with the monopole radiation patch 1 and used for feeding the microstrip antenna.
The dielectric substrate 3 comprises at least one layer of dielectric, and the metal ring belt 5 is generally attached to the first layer of dielectric surface of the dielectric substrate 3;
the microstrip antenna also comprises a grounding plate 6, wherein the grounding plate 6 and the metal ring belt 5 are arranged on the same side surface of the dielectric substrate 3;
the annular groove 2 and the metal annulus 5 are part of open-loop resonators (SRRs) and part of complementary open-loop resonators (CSRRs), respectively; when the SRRs work at the resonant frequency, the annular groove 2 can induce annular current under the action of a microwave magnetic field, namely a magnetic moment, so that the original magnetic field is strengthened or resisted, and negative magnetic conductivity appears at the resonant frequency, so that a band elimination effect is achieved near the resonant frequency; when the CSRRs work near the resonant frequency, the metal ring belt 5 is equivalent to an electric dipole, has a negative dielectric constant near the resonant frequency, and has a band stop effect;
the shape of the monopole radiation patch 1 can be any shape, such as rectangle, circle, polygon or circular ring; the annular groove 2 and the metal ring band 5 may be circular or square.
In the embodiment of the present invention, a surface of a monopole radiation patch 1 of a microstrip antenna is shown in fig. 2, where the microstrip antenna includes: the monopole radiating patch comprises a monopole radiating patch 1, a dielectric substrate 3 and a microstrip feeder 4, wherein an annular groove 2 is formed in the monopole radiating patch 1; the relationship between the parts is given in fig. 1 and will not be described here.
In the embodiment of the present invention, the surface of the metal ring 5 of the microstrip antenna is as shown in fig. 3, and the other side surface of the dielectric substrate 3 of the microstrip antenna, which is opposite to the monopole radiation patch 1, is attached with the metal ring 5 and the ground plate 6, wherein,
the metal ring belt 5 is positioned on the first layer medium surface of the medium substrate 3;
the annular metal band 5 is coupled with the annular groove 2 in fig. 2 to form a complementary split-ring resonator, the electrical lengths of the annular groove 2 and the annular metal band 5 are changed by adjusting the lengths of the annular groove 2 and the annular metal band 5, and when the respective electrical lengths of the annular groove 2 and the annular metal band 5 are equal to half-wavelength of signals with different frequencies, resonance is generated respectively, that is, the annular groove 2 and the annular metal band 5 have different resonance frequencies; a third resonant frequency can be coupled out by adjusting the distance between the annular groove 2 and the metal annular belt 5, and the bandwidth and the out-of-band rejection capability of a resonant frequency band are adjusted according to the coupling strength; therefore, by adjusting the impedance bandwidth of the stop band of the microstrip antenna, the microstrip antenna can filter interference signals of three frequency bands and work in at least four frequency bands, thereby solving the problem of interference of adjacent frequency bands.
Generally, the ground plate 6 of the microstrip antenna is a plane, and here, a portion of the ground plate 6 may be cut off to form a defected ground.
In the microstrip antenna, the microstrip feeder line 4 is inductive, the ground plate 6 and the monopole radiation patch 1 are capacitive, and the capacitance and the inductance are equal to each other and cancel each other out by adjusting the distance between the ground plate 6 and the monopole radiation patch 1, so that the microstrip antenna is purely resistive, impedance matching of the microstrip antenna can be realized, and thus, the ultra-wideband of the microstrip antenna can be realized.
In addition, the microstrip antenna can be fed by adopting a microstrip feeder line, and can also be fed by adopting a coupling feeding or probe feeding mode.
Based on the above microstrip antenna, the embodiment of the present invention further provides a mobile terminal, which includes the microstrip antenna shown in fig. 1, as shown in fig. 4, the microstrip antenna is disposed on the PCB circuit board near the USB interface of the mobile terminal 7, wherein,
the microstrip antenna includes: the monopole radiating patch comprises a monopole radiating patch 1, a dielectric substrate 3 and a microstrip feeder line 4; wherein,
the monopole radiation patch 1 is printed on one side surface of the dielectric substrate 3;
an annular groove 2 is formed in the monopole radiation patch 1, and the annular groove 2 and a metal annular band 5 attached to the surface of the medium substrate 3, which is opposite to the other side of the monopole radiation patch 1, form a complementary split ring resonator for filtering interference signals; here, the metal ring belt 5 is located on the different surface of the annular groove 2, which is not shown in fig. 4, and can be seen in fig. 1;
the microstrip feeder line 4 is connected with the monopole radiation patch 1 and used for feeding the microstrip antenna.
The dielectric substrate 3 comprises at least one layer of dielectric, and the metal ring belt 5 is generally attached to the first layer of dielectric surface of the dielectric substrate 3;
the microstrip antenna also comprises a grounding plate 6, wherein the grounding plate 6 and the metal ring belt 5 are arranged on the same side surface of the dielectric substrate 3;
the shape of the monopole radiation patch 1 can be any shape, such as rectangle, circle, polygon or circular ring; the annular groove 2 and the metal ring band 5 may be circular or square.
The annular metal band 5 is coupled with the annular groove 2 in fig. 2 to form a complementary split-ring resonator, the electrical lengths of the annular groove 2 and the annular metal band 5 are changed by adjusting the lengths of the annular groove 2 and the annular metal band 5, and when the respective electrical lengths of the annular groove 2 and the annular metal band 5 are equal to half-wavelength of signals with different frequencies, resonance is generated respectively, that is, the annular groove 2 and the annular metal band 5 have different resonance frequencies; a third resonant frequency can be coupled out by adjusting the distance between the annular groove 2 and the metal annular belt 5, and the bandwidth and the out-of-band rejection capability of a resonant frequency band are adjusted according to the coupling strength; therefore, by adjusting the impedance bandwidth of the stop band of the microstrip antenna, the microstrip antenna can filter interference signals of three frequency bands and work in at least four frequency bands, thereby solving the problem of interference of adjacent frequency bands.
Generally, the ground plate 6 of the microstrip antenna is a plane, and here, a portion of the ground plate 6 may be cut off to form a defected ground.
In the microstrip antenna, the microstrip feeder line 4 is inductive, the ground plate 6 and the monopole radiation patch 1 are capacitive, and the capacitance and the inductance are equal to each other and cancel each other out by adjusting the distance between the ground plate 6 and the monopole radiation patch 1, so that the microstrip antenna is purely resistive, impedance matching of the microstrip antenna can be realized, and thus, the ultra-wideband of the microstrip antenna can be realized.
In addition, the microstrip antenna can be fed by adopting a microstrip feeder line, and can also be fed by adopting a coupling feeding or probe feeding mode.
Fig. 5 is a schematic flowchart of a method for filtering an interference signal by a microstrip antenna according to an embodiment of the present invention, as shown in fig. 5, the method includes the following steps:
step 501: an annular groove is formed in a monopole radiation patch of the microstrip antenna, and the annular groove and a metal annular band attached to the surface of the other side, opposite to the monopole radiation patch, of a dielectric substrate of the microstrip antenna form a complementary split-ring resonator;
specifically, an annular groove is formed in a monopole radiation patch of the microstrip antenna, a metal annular band is attached to the surface of the other side, opposite to the monopole radiation patch, of the dielectric substrate, and the annular groove and the metal annular band form a complementary split ring resonator; the complementary split ring resonator filters interference signals of three frequency bands, and the lengths and the intervals of the annular groove and the metal annular band are determined according to the frequency bands of the three interference signals;
in this step, the determining the lengths and the distances between the annular groove and the metal annular band according to the frequency bands of the three interference signals may be: and respectively determining the respective lengths of the annular groove and the metal girdle according to the half-wavelength of the central frequency of two interference signal frequency bands in the three interference signal frequency bands, and then adjusting the distance between the annular groove and the metal girdle according to the half-wavelength of the central frequency of the remaining interference signal frequency band.
Step 502: the microstrip antenna filters interference signals through the complementary split ring resonator;
specifically, the microstrip antenna resonates in the frequency bands of the three interference signals through the complementary split ring resonator, so that the interference signals in the three frequency bands can be filtered, and the microstrip antenna works in at least four frequency bands, thereby solving the problem of interference of adjacent frequency bands.
Example one
The first embodiment of the invention is a wireless terminal product adopting the microstrip antenna, and the requirements are satisfied with data transmission services of W2100 (downlink: 2110-. Data traffic between W2100 and LTE band40, between LTE band40 and WLAN, and between WLAN and LTE band7 is prone to generate interference;
when the microstrip antenna operates in four different frequency bands of W2100, LTE band40, wlan2.4ghz and LTE band7, interference between the four different frequency bands needs to be filtered, so that the microstrip antenna can operate in a required frequency band by adjusting the lengths and the distances of the annular groove 2 and the metal annular band 5 of the microstrip antenna shown in fig. 1, wherein the lengths of the annular groove 2 and the metal annular band 5 are respectively equal to 16mm and 14mm, and the distance between the annular groove 2 and the metal annular band 5 is 6.5 mm.
Fig. 6 is a return loss curve chart of the microstrip antenna according to the first embodiment of the present invention, as shown in fig. 6, wherein the abscissa is the signal frequency (in GHz) of the microstrip antenna; the ordinate is the return loss (unit is dB) of the corresponding signal of the microstrip antenna, and it can be seen that the microstrip antenna works in the W2100, LTEband40, wlan2.4ghz, and LTE band7 frequency bands, and the interference between them is filtered out.
Compared with the traditional microstrip antenna, the microstrip antenna in the first embodiment has the size reduced by 30%. When the traditional microstrip antenna realizes multiple frequency bands, two branches need to be added on the monopole radiation patch, so that the size of the microstrip antenna is increased. Specifically, realizing a resonant frequency according to λ/2 can calculate that at least 32mm is needed to realize the microstrip antenna to work in the 2.2-2.3GHz band, wherein when the additional branch is bent, the length is increased by 5 mm. Therefore, compared with the microstrip antenna with the size of 20mm by 15mm in fig. 1, the conventional microstrip antenna achieves the same frequency band size by relatively increasing 30%.
In one embodiment, the distance between the annular groove and the metal ring belt is adjustable, and the distance ranges from the maximum radius to the minimum radius of the annular groove and the metal ring belt.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (6)
1. A microstrip antenna, comprising: a dielectric substrate, a monopole radiation patch and a microstrip feed line, wherein,
the monopole radiation patch is printed on the surface of one side of the dielectric substrate;
the monopole radiation patch is provided with an annular groove, the annular groove and a metal annular band attached to the surface of the medium substrate on the other side opposite to the monopole radiation patch form a complementary split ring resonator for filtering interference signals, wherein the respective electrical lengths of the annular groove and the metal annular band are equal to half wavelengths of signals with different frequencies and respectively have different resonant frequencies;
a third resonant frequency is coupled between the metal annular band and the annular groove;
the microstrip feeder line is connected with the monopole radiation patch and used for feeding the microstrip antenna.
2. The microstrip antenna of claim 1 wherein the dielectric substrate includes at least one layer of dielectric and the metal annulus is attached to a first layer of dielectric surface of the dielectric substrate.
3. The microstrip antenna of claim 1 wherein the monopole radiating patch is rectangular, circular, polygonal, or circular in shape.
4. The microstrip antenna of claim 1 wherein the annular groove and the metal annulus are circular or square.
5. A method for filtering interference signals by a microstrip antenna is characterized by comprising the following steps:
the monopole radiation patch is provided with an annular groove, the annular groove and a metal annular band attached to the surface of the other side, opposite to the monopole radiation patch, of the dielectric substrate form a complementary split-ring resonator, and interference signals are filtered by the complementary split-ring resonator;
and the complementary split ring resonator filters interference signals of three frequency bands, and determines the lengths and the intervals of the annular groove and the metal annular band according to the frequency bands of the three interference signals.
6. A mobile terminal, characterized in that it comprises a microstrip antenna according to any of claims 1 to 4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310433345.1A CN104466399B (en) | 2013-09-22 | 2013-09-22 | Method, the mobile terminal of a kind of microstrip antenna and its filtering interference signals |
| PCT/CN2014/075633 WO2015039433A1 (en) | 2013-09-22 | 2014-04-17 | Microstrip antenna and method for filtering interference signal thereof, and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310433345.1A CN104466399B (en) | 2013-09-22 | 2013-09-22 | Method, the mobile terminal of a kind of microstrip antenna and its filtering interference signals |
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| CN104466399A CN104466399A (en) | 2015-03-25 |
| CN104466399B true CN104466399B (en) | 2019-03-05 |
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| WO2015039433A1 (en) | 2015-03-26 |
| CN104466399A (en) | 2015-03-25 |
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