CN207303376U - Low frequency broadband mobile terminal antenna is realized using double resonance - Google Patents
Low frequency broadband mobile terminal antenna is realized using double resonance Download PDFInfo
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- CN207303376U CN207303376U CN201621339021.7U CN201621339021U CN207303376U CN 207303376 U CN207303376 U CN 207303376U CN 201621339021 U CN201621339021 U CN 201621339021U CN 207303376 U CN207303376 U CN 207303376U
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Abstract
It the utility model is related to one kind and realize low frequency broadband mobile terminal antenna using double resonance, it is characterized in that, printed circuit board and antenna part constitute whole mobile terminal antenna, antenna part is depended on stent, it is integrally located at printed circuit board (PCB) upper end, antenna part includes feeder line, first ground wire, second ground wire, antenna radiator, the both ends of feeder line connect antenna radiator and feed respectively, feeder line, first ground wire and the second ground wire pass through input matching circuit respectively, first grounded inductor, second grounded inductor connects antenna radiator and printed circuit board.The utility model realizes low frequency 690MHz 1GHz frequency coverages, reaches the effect of wideband.This utility model can effectively widen the bandwidth of high frequency low frequency part effectively using being grounded on the basis of product integral miniaturization.It can meet low frequency band and the covering requirement of GSM low frequency bands that disclosure satisfy that forth generation mobile communication standard 4G LTE, while antenna has preferable efficiency and gain.
Description
[ technical field ]
The utility model belongs to novel mobile terminal antenna especially relates to an utilize novel two resonance techniques to realize low frequency broadband mobile terminal antenna.
[ background art ]
Modern wireless communication devices are required to cover as wide a frequency band as possible to achieve more functionality. However, for small-sized terminal embedded antennas such as mobile phones, antenna design is greatly restricted in a limited space, and it is difficult to realize a wide frequency band. The existing broadband technology mainly includes three types, i.e., port matching, low-frequency coupling and dual low-frequency branch wiring. In the port matching technology, an LC network needs to be added at an input port, so that the bandwidth is improved limitedly, the energy loss is increased due to the addition of a matching element, and the antenna efficiency is often lower; the low-frequency coupling technology is generated by coupling the extended ground wire with the main branch of the antenna, the required antenna space is greatly increased, the coupling effect is greatly influenced by the environment, and the antenna performance is generally poor; the dual low-frequency branch wiring technology can multiply the antenna space and is not suitable for the antenna design of the miniaturized mobile terminal. The utility model discloses an utilize novel two resonance techniques to realize low frequency broadband mobile terminal antenna, the frequency covers 690MHz-1GHz, realizes high efficiency performance simultaneously. The utility model discloses a novel two resonance techniques realize two kinds of resonance mode under single line of walking, can extend the bandwidth scope greatly, and the bandwidth scope is about 3.5 times of traditional PIFA antenna, realizes efficient antenna radiation when not increasing antenna area occupied, is suitable for miniaturized broadband antenna design, can use widely in the different mobile terminal antenna design of each different frequency channels, has very strong practicality.
[ summary of the invention ]
The utility model provides an utilize double resonance to realize low frequency broadband mobile terminal antenna, this novel mobile terminal antenna includes: the antenna comprises a feeder line 1, a first grounding line 2, a second grounding line 3, an antenna radiator 4, a printed circuit board 5, an input matching circuit 6, a first grounding inductor 7, a second grounding inductor 8 and a feed source 9; the printed circuit board is mainly a PCB board, and an antenna part is arranged at the upper end of the printed circuit board; the antenna part comprises a feeder line, a first ground wire, a second ground wire, an input matching circuit, a first ground inductor, a second ground inductor and an antenna radiator, wherein the feeder line, the ground wire and the antenna radiator are attached to the surface of the plastic support; the printed circuit board and the antenna part constitute the whole antenna system.
Wherein,
a feeder line: in the first drawing, a microstrip line is shown to connect the feed source and the antenna radiator, but the microstrip line may be a connection line for transmitting signals, such as an elastic pin or a thimble.
A first ground line: the first grounding wire and the first grounding inductor are connected with the antenna radiator and the ground terminal. The first grounding wire is a near-ground grounding wire, has the functions of changing current distribution and impedance transformation, and realizes double resonance together with the second grounding wire and the second grounding inductor. The first ground wire is closer to the feeder line, and is generally 2-10 mm. The first ground line location is not limited to the right side of the feed line but may also be the left side of the feed line, similar to the conventional PIFA antenna ground line location.
A second ground line: the second grounding wire and the second grounding inductor are connected with the antenna radiator and the ground end. The second grounding wire is a remote grounding wire and has the functions of changing current distribution and impedance transformation. The second grounding wire, the second grounding inductor, the first grounding wire, the first grounding inductor, the feeder line and the input matching circuit generate three LOOP structures, a high-frequency resonance mode is excited, and the radiation bandwidth of the antenna is greatly widened. The second grounding line is far away from the feeder line and distributed on the side of the antenna radiator.
An antenna radiator: the antenna radiator is the main part of antenna radiation, and realizes dual-resonance antenna radiation together with the first grounding wire and the second grounding wire. In order to realize low frequency resonance in a smaller space, the antennas shown in the first and second figures are in a U-shaped wiring form, however, the dual-resonance utility model is not limited to a fixed antenna wiring form, and the antenna radiator can be in an arbitrary wiring form.
A printed circuit board: the feed is on a printed circuit board, which mainly acts as an antenna ground.
An input matching circuit: the figure depicts series capacitance, but is not limited to a single matching element. The novel double resonance technology only needs the input port to be provided with a matching circuit which is in capacitive impedance transformation. The signal enters the feeder line and the antenna radiator through the feed source and the input matching circuit. The input matching circuit is primarily used to facilitate high frequency resonant mode generation.
First ground inductance: the inductor is illustrated, but not limited to the inductor, a long grounding trace may be used, and other matching elements may be added on the basis of the parallel inductor. The novel dual resonance technique requires only the first ground line to be connected in parallel to ground via an inductive matching circuit. The antenna radiator is connected with a first grounding electrode in parallel to sense the ground through a first grounding wire near the ground end. The first grounding inductor has a small inductance value and generates a conventional PIFA type low frequency resonant mode with the antenna radiator.
Second grounding inductance: the inductor is illustrated, but not limited to the inductor, a long grounding trace may be used, and other matching elements may be added on the basis of the parallel inductor. The novel dual resonance technique requires only the second ground line to be connected in parallel to ground via an inductive matching circuit. The antenna radiator is connected with a second grounding electrode in parallel to sense the ground through a second grounding wire at the far ground end. The second grounding inductor has a larger inductance value, and the LOOP structure generated by the antenna radiator and the feeder line promotes the generation of a high-frequency resonance mode.
The ground wire is attached to the support and connected to the antenna and the printed circuit board through the matching circuit, and the feeder is connected to the feed source and the antenna radiator. The antenna generates two different resonant modes, namely a low-frequency resonant mode and a high-frequency resonant mode, and the principle is shown in figure three. The low-frequency resonance mode is similar to a common PIFA antenna and is generated by the combined action of an antenna radiator, an input matching circuit, a first grounding wire and a first grounding inductor, and the total length of the antenna radiator is approximately equal to the lambda/4 wavelength length of the low-frequency resonance frequency; the high-frequency resonance mode is generated by the combined action of the antenna radiator, the input matching circuit, the first grounding wire and the first grounding inductor, and the second grounding wire and the second grounding inductor, and the high-frequency resonance frequency can be adjusted by the position of the second grounding wire and the size of the second grounding inductor. The two grounding wires, the grounding inductor, the feeder line and the antenna radiator generate three LOOP structures, wherein the LOOP structures generated by the feeder line, the antenna radiator, the second grounding wire and the second grounding inductor greatly promote the generation of a high-frequency resonance mode. Under two kinds of different resonance mode effects, the utility model discloses a novel two resonance techniques have widened frequency bandwidth greatly, compare general PIFA structure bandwidth and increased about 3.5 times to need not increase antenna area.
The utility model utilizes the first grounding wire and the first grounding inductor, the second grounding wire and the second grounding inductor, the antenna radiator and the input matching circuit to jointly form the antenna radiation under two resonant modes; the two resonant frequencies are relatively close, and the antenna radiation of a low-frequency broadband 690MHz-1GHz can be realized.
The utility model has the advantages that: the antenna of the low-frequency broadband mobile terminal is realized by utilizing double resonance, and antenna radiation under two modes is formed by the first grounding wire, the first grounding inductor, the second grounding wire, the second grounding inductor and the antenna input matching circuit together, so that the low-frequency 690MHz-1GHz frequency coverage is realized, and the broadband effect is achieved. This utility model discloses can effectually adopt the second earth connection, can effectually widen the bandwidth of low frequency part on the basis that does not increase the antenna size, can satisfy the coverage requirement of fourth generation mobile communication standard 4G LTE low frequency channel and GSM low frequency channel, the antenna has fine efficiency simultaneously.
[ description of the drawings ]
FIG. 1 is a schematic diagram of an external structure of an antenna
FIG. 2 is a cross-sectional view of an antenna
FIG. 3 is a schematic diagram of the principle of dual resonance
FIG. 4 is a return loss S parameter diagram of an antenna
FIG. 5 is a graph of antenna efficiency
Description of the drawings
The antenna comprises a feed line 1, a first ground line 2, a second ground line 3, an antenna radiator 4, a printed circuit board 5, an input matching circuit 6, a first ground inductor 7, a second ground inductor 8 and a feed source 9.
[ detailed description of the invention ]
In order to more clearly and effectively explain the technical solutions of the embodiments of the present invention, the technical solutions of the present invention will be further described with reference to the accompanying drawings and embodiments, which are believed to be clear to those skilled in the art.
As shown in fig. 1 and 2, the antenna portion is attached to a support and positioned as a whole above the printed circuit board. The feed line 1 is connected with the antenna radiator 4 and the feed source 9, the first ground line 2 and the second ground line 3 are connected with the antenna radiator 9 and the printed circuit board 5 through the first ground inductor 7, the first ground inductor 8 and the second ground inductor 7, 8. The radiation of the antenna with two resonant modes is realized through the combined action of the antenna radiator, the input matching circuit, the two grounding wires at the far end and the near end and the corresponding grounding inductor, and the principle is shown in fig. 3. Thereby realizing low frequency dual resonance. The utility model discloses the low frequency broadband who realizes has better antenna radiation performance, as shown in figure 4, figure 5.
Fig. 4 shows the return loss of the low-frequency dual-resonance port under the novel dual-resonance technology. According to fig. 4, the utility model discloses a two kinds of resonance mode can be realized to two resonance antenna, and two resonant frequency are comparatively close, produce two resonance effect, have widened the low frequency bandwidth greatly.
Fig. 5 shows the efficiency of a low frequency dual-resonant antenna under the novel dual-resonant technique. According to the figure five shows, the utility model discloses a two resonance antenna all can reach very good antenna efficiency in the low frequency channel within range of broad.
Wherein,
a feeder line: in the first drawing, a microstrip line is shown to connect the feed source and the antenna radiator, but the microstrip line may be a connection line for transmitting signals, such as an elastic pin or a thimble.
A first ground line: the first grounding wire and the first grounding inductor are connected with the antenna radiator and the ground terminal. The first grounding wire is a near-ground grounding wire, has the functions of changing current distribution and impedance transformation, and realizes double resonance together with the second grounding wire and the second grounding inductor. The first ground wire is closer to the feeder line, and is generally 2-10 mm. The first ground line location is not limited to the right side of the feed line but may also be the left side of the feed line, similar to the conventional PIFA antenna ground line location.
A second ground line: the second grounding wire and the second grounding inductor are connected with the antenna radiator and the ground end. The second grounding wire is a remote grounding wire and has the functions of changing current distribution and impedance transformation. The second grounding wire, the second grounding inductor, the first grounding wire, the first grounding inductor, the feeder line and the input matching circuit generate three LOOP structures, a high-frequency resonance mode is excited, and the radiation bandwidth of the antenna is greatly widened. The second grounding line is far away from the feeder line and distributed on the side of the antenna radiator.
An antenna radiator: the antenna radiator is the main part of antenna radiation, and realizes dual-resonance antenna radiation together with the first grounding wire and the second grounding wire. In order to realize low frequency resonance in a smaller space, the antennas shown in the first and second figures are in a U-shaped wiring form, however, the dual-resonance utility model is not limited to a fixed antenna wiring form, and the antenna radiator can be in an arbitrary wiring form.
A printed circuit board: the feed is on a printed circuit board, which mainly acts as an antenna ground.
An input matching circuit: the figure depicts series capacitance, but is not limited to a single matching element. The novel double resonance technology only needs the input port to be provided with a matching circuit which is in capacitive impedance transformation. The signal enters the feeder line and the antenna radiator through the feed source and the input matching circuit. The input matching circuit is primarily used to facilitate high frequency resonant mode generation.
First ground inductance: the inductor is illustrated, but not limited to the inductor, a long grounding trace may be used, and other matching elements may be added on the basis of the parallel inductor. The novel dual resonance technique requires only the first ground line to be connected in parallel to ground via an inductive matching circuit. The antenna radiator is connected with a first grounding electrode in parallel to sense the ground through a first grounding wire near the ground end. The first grounding inductor has a small inductance value and generates a conventional PIFA type low frequency resonant mode with the antenna radiator.
Second grounding inductance: the inductor is illustrated, but not limited to the inductor, a long grounding trace may be used, and other matching elements may be added on the basis of the parallel inductor. The novel dual resonance technique requires only the second ground line to be connected in parallel to ground via an inductive matching circuit. The antenna radiator is connected with a second grounding electrode in parallel to sense the ground through a second grounding wire at the far ground end. The second grounding inductor has a larger inductance value, and the LOOP structure generated by the antenna radiator and the feeder line promotes the generation of a high-frequency resonance mode.
The ground wire is attached to the support and connected to the antenna and the printed circuit board through the matching circuit, and the feeder is connected to the feed source and the antenna radiator. The antenna generates two different resonant modes, namely a low-frequency resonant mode and a high-frequency resonant mode, and the principle is shown in figure three. The low-frequency resonance mode is similar to a common PIFA antenna and is generated by the combined action of an antenna radiator, an input matching circuit, a first grounding wire and a first grounding inductor, and the total length of the antenna radiator is approximately equal to the lambda/4 wavelength length of the low-frequency resonance frequency; the high-frequency resonance mode is generated by the combined action of the antenna radiator, the input matching circuit, the first grounding wire and the first grounding inductor, and the second grounding wire and the second grounding inductor, and the high-frequency resonance frequency can be adjusted by the position of the second grounding wire and the size of the second grounding inductor. The two grounding wires, the grounding inductor, the feeder line and the antenna radiator generate three LOOP structures, wherein the LOOP structures generated by the feeder line, the antenna radiator, the second grounding wire and the second grounding inductor greatly promote the generation of a high-frequency resonance mode. Under two kinds of different resonance mode effects, the utility model discloses a novel two resonance techniques have widened frequency bandwidth greatly, compare general PIFA structure bandwidth and increased about 3.5 times to need not increase antenna area.
The utility model utilizes the first grounding wire and the first grounding inductor, the second grounding wire and the second grounding inductor, the antenna radiator and the input matching circuit to jointly form the antenna radiation under two resonant modes; the two resonant frequencies are relatively close, and the antenna radiation of a low-frequency broadband 690MHz-1GHz can be realized.
Claims (9)
1. A mobile terminal antenna for realizing low frequency and wide frequency band by using double resonance is characterized by comprising: the antenna comprises a feeder line (1), a first grounding line (2), a second grounding line (3), an antenna radiator (4), a printed circuit board (5), an input matching circuit (6), a first grounding inductor (7), a second grounding inductor (8) and a feed source (9), wherein the printed circuit board is a PCB (printed circuit board), and an antenna part is arranged at the upper end of the printed circuit board; the antenna part comprises a feeder line (1), a first grounding line (2), a second grounding line (3), an input matching circuit (6), a first grounding inductor (7), a second grounding inductor (8) and an antenna radiation body (4), wherein the feeder line (1), the first grounding line (2) and the second grounding line (3) are respectively connected to a printed circuit board (5) through the input matching circuit (6), the first grounding inductor (7) and the second grounding inductor (8), two ends of the feeder line (1) are respectively connected with the antenna radiation body (4) and a feed source (9), and the printed circuit board (5) and the antenna part form the whole antenna system.
2. The mobile terminal antenna for realizing a low frequency broadband by using dual resonance as claimed in claim 1, wherein the feeder, the ground line, the antenna radiator are attached to the surface of the plastic support.
3. The antenna for realizing low frequency and wide frequency band by using dual resonance as claimed in claim 1, wherein said feeder is a microstrip line, or a pogo pin, or a thimble connecting the feed source and the antenna radiator, a connecting element for transmitting signals.
4. The antenna for realizing a low frequency broadband mobile terminal by using dual resonance as claimed in claim 1, wherein said first grounding line and said first grounding inductor connect the antenna radiator and the ground, the first grounding line is a near ground line, the first grounding line is closer to the feeder line, and is generally 2-10 mm; the first ground line position is not limited to the right side of the feeder line, and can also be the left side of the feeder line.
5. The antenna for realizing a low frequency broadband mobile terminal by using dual resonance as claimed in claim 1, wherein the second grounding line connects the antenna radiator and the ground terminal through the second grounding inductor, the second grounding line is a remote grounding line, and the second grounding line, the second grounding inductor, the first grounding line, the first grounding inductor, the feeder line and the LOOP structure generated by the input matching circuit can excite the high frequency resonance mode, thereby greatly widening the radiation bandwidth of the antenna; the second ground wire is distributed at the side of the antenna radiator.
6. The antenna for realizing low frequency broadband mobile terminal according to claim 1, wherein the antenna radiator is a main part of the antenna radiation, and the antenna radiator and the first ground line and the second ground line together realize the antenna radiation of double resonance, and the antenna radiator may be in any trace form.
7. The antenna for realizing a low frequency broadband mobile terminal according to claim 1, wherein the input matching circuit is only required to have a matching circuit with capacitive impedance transformation at the input port, and the signal enters the feed line and the antenna radiator through the input matching circuit from the feed source.
8. A low frequency broadband mobile terminal antenna implemented with dual resonance as claimed in claim 1, wherein the first grounding inductance: the antenna radiator is connected with the first grounding inductor in parallel through the first grounding wire close to the ground end.
9. The antenna for realizing low frequency broadband mobile terminal using dual resonance as claimed in claim 1, wherein the second grounding inductor is an inductor or a very long grounding trace or other matching element is added on the basis of a parallel inductor, only the second grounding line is connected in parallel to the ground through an inductive matching circuit, and the antenna radiator is connected in parallel to the second grounding capacitor through the second grounding line at the far end of the ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621339021.7U CN207303376U (en) | 2016-12-08 | 2016-12-08 | Low frequency broadband mobile terminal antenna is realized using double resonance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621339021.7U CN207303376U (en) | 2016-12-08 | 2016-12-08 | Low frequency broadband mobile terminal antenna is realized using double resonance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505323A (en) * | 2016-12-08 | 2017-03-15 | 上海煜鹏通讯电子股份有限公司 | Low frequency broadband mobile terminal antenna is realized using double resonance |
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- 2016-12-08 CN CN201621339021.7U patent/CN207303376U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505323A (en) * | 2016-12-08 | 2017-03-15 | 上海煜鹏通讯电子股份有限公司 | Low frequency broadband mobile terminal antenna is realized using double resonance |
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