CN109921178B - Mobile terminal antenna device - Google Patents
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- CN109921178B CN109921178B CN201910123845.2A CN201910123845A CN109921178B CN 109921178 B CN109921178 B CN 109921178B CN 201910123845 A CN201910123845 A CN 201910123845A CN 109921178 B CN109921178 B CN 109921178B
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- 238000013461 design Methods 0.000 claims abstract description 30
- 230000003071 parasitic effect Effects 0.000 claims abstract description 21
- 230000005855 radiation Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 50
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 4
- PEZNEXFPRSOYPL-UHFFFAOYSA-N (bis(trifluoroacetoxy)iodo)benzene Chemical compound FC(F)(F)C(=O)OI(OC(=O)C(F)(F)F)C1=CC=CC=C1 PEZNEXFPRSOYPL-UHFFFAOYSA-N 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 3
- 230000024241 parasitism Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Abstract
The invention discloses a mobile terminal antenna device, which relates to the technical field of communication antennas and comprises a first radiator, wherein the first radiator is connected with a first signal output end of a processor through a signal source, one end of a second radiator is connected with the first radiator through a switch circuit, the other end of the second radiator is grounded through a first active switch, and a second signal output end and a third signal output end of the processor are respectively connected with the switch circuit and a control signal input end of the first active switch. The invention realizes the tunable parasitic frequency band, the reconfigurable antenna radiator and the compatible design of multiple antennas in a small radiation environment through the tuning design of the switch circuit on the multiple antenna bodies, and can provide various tunable schemes through antenna parasitism and the reconfigurable radiator mode, thereby realizing the broadband/multi-frequency design of the antennas and the close-range high-isolation design of the multiple antennas.
Description
Technical Field
The invention belongs to the technical field of communication antennas, and particularly relates to a mobile terminal antenna device.
Background
Along with the development of communication technology and internet of things technology, carriers of mobile communication terminals permeate into various traditional industry fields, such as wearable products, internet of things monitoring equipment, smart home and the like, through mobile phones. While products for mobile communication function demands are increased, product designs are also facing diversified design demands of terminals. The miniaturization and broadband design requirements of antennas are becoming more and more apparent in the face of the design environment of miniaturized portable products or all-metal-looking products.
The antenna is used as an electromagnetic signal conversion device, and the radiation efficiency, coverage bandwidth and other design parameters of the antenna depend on the clearance of the antenna and the surrounding electromagnetic environment. The design trends of the above products bring about non-negligible negative effects on the design of the antenna performance. Meanwhile, the 5G communication further requires the broadband technology of the product, and the integration, miniaturization design and broadband design of the antenna are technical difficulties to be overcome in the research and development of the industry.
The antenna broadband design technology of the current mobile communication product mainly adopts parasitic coupling or tuning of antenna active switch/variable capacitor to antenna impedance matching to realize the broadband design of the current antenna due to the common shortage of antenna design area. But all have the design problems: the parasitic coupling adopts a grounded parasitic body and an antenna body to realize parasitism through electromagnetic radiation, but multi-frequency tuning cannot be realized, and certain requirements are met on the coupling areas of the antenna body and the parasitic branches, so that the parasitic coupling is not suitable for miniaturized antenna design; tuning of antenna active switch/variable capacitor to antenna impedance matching can only implement frequency band tuning to single antenna radiator, can not realize near-frequency and broadband design at the same time, and is still limited in design in the face of more severe environment.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to providing a mobile terminal antenna device with high isolation and broadband design.
In order to achieve the above object, the present invention provides a mobile terminal antenna device, which includes a first radiator, the first radiator is connected to a first signal output end of a processor through a signal source, one end of a second radiator is connected to the first radiator through a switch circuit, the other end of the second radiator is grounded through a first active switch, a second signal output end of the processor is connected to a control signal input end of the switch circuit, a third signal output end of the processor is connected to a control signal input end of the first active switch, and the processor controls on-off of the switch circuit and the first active switch to realize a single antenna multiple configuration.
By adopting the technical scheme, the multi-antenna type reconfigurable antenna is realized through the switching/tuning function of the switching circuit on the first radiator and the second radiator and the grounding tuning of the switch on the second radiator, and the purpose of increasing the antenna bandwidth is achieved.
Further, the switching circuit is a variable capacitor.
Further, the variable capacitance is classified into a high-resistance state or a low-resistance state according to the working frequency band, when the variable capacitance is in the high-resistance state, the first radiator and the second radiator are in an open-circuit state, and when the variable capacitance is in the low-resistance state, the first radiator and the second radiator are in a short-circuit state.
By adopting the technical scheme, the switching effect between the second radiator and the first radiator is realized through the capacitive effect of the variable capacitor, and the second radiator is used as an antenna branch or a parasitic radiator to be reconfigurable.
Further, the switching circuit is a second active switch connected in series with more than two capacitors or inductors.
Further, one end of the second active switch is connected with the first radiator, the other end of the second active switch is connected with the second radiator through a first capacitor and a second capacitor which are connected in parallel, and a signal output end of the processor is connected with a control signal input end of the second active switch.
According to the technical scheme, the second active switch is controlled by the processor, so that capacitors with different capacitance values are connected between the first radiator and the second radiator, on-off between the second radiator and the first radiator is realized, and further, the second radiator is used as an antenna branch or a parasitic radiator to be reconfigurable.
Preferably, the first active switch further comprises a matching device through which the first active switch is connected to ground.
Preferably, the matching device comprises a capacitor or an inductor.
The beneficial effects of the invention are as follows: the invention can realize the tuning of the multi-antenna body by the switch circuit, the tunable parasitic frequency band, the reconfigurable antenna radiator and the compatible design of the multi-antenna in the small radiation environment, and can provide various tunable schemes by the antenna parasitic and the reconfigurable radiator modes, thereby realizing the broadband/multi-frequency design of the antenna and the close-range high-isolation design of the multi-antenna.
Drawings
FIG. 1 is a schematic diagram of a frame of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a frame of another embodiment of the present invention.
Fig. 3 is a schematic diagram of a first active switch grounded and a switch circuit in a short-circuit state according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a first active switch grounded and a switch circuit in an open state according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a first active switch in an open circuit and a short circuit state according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a first active switch according to an embodiment of the present invention in an open state.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
Example 1: as shown in fig. 1, the mobile terminal antenna device includes a first radiator 1, the first radiator 1 is connected with a first signal output end of a processor 4 through a signal source 2, one end of a second radiator 3 is connected with the first radiator 1 through a switch circuit, the other end of the second radiator 3 is grounded through a first active switch 5, a second signal output end of the processor 4 is connected with a control signal input end of the switch circuit, a third signal output end of the processor 4 is connected with a control signal input end of the first active switch 5, and the on-off of the switch circuit and the first active switch 5 is controlled by the processor 4, so that a single antenna multiple configuration is realized.
The first active switch 5 is connected to ground through a matching device 6, which matching device 6 comprises a capacitance or an inductance, in this embodiment two capacitances in parallel.
In this embodiment, the switching circuit is a variable capacitor 7.
The variable capacitor 7 is divided into a high-resistance state or a low-resistance state according to the working frequency band, when the variable capacitor 7 is in the high-resistance state, the first radiator 1 and the second radiator 3 are in an open-circuit state, and when the variable capacitor 7 is in the low-resistance state, the first radiator 1 and the second radiator 3 are in a short-circuit state.
Example 2: as shown in fig. 2, this embodiment has substantially the same structure as embodiment 1, except that the switching circuit is a second active switch 8 connected in series with two or more capacitors.
One end of the second active switch 8 is connected with the first radiator 1, the other end of the second active switch 8 is connected with the second radiator 3 through a first capacitor C1 and a second capacitor C2 which are connected in parallel, and a signal output end of the processor 4 is connected with a control signal input end of the second active switch 8.
In this embodiment, the first capacitor C1 has a large capacitance value, and the second capacitor C2 has a small capacitance value.
As shown in fig. 3, when the first active switch 5 is grounded through the corresponding matching device 6, the shape of the second radiator 3 can be equivalently changed, and the variable capacitor 7 is in a small capacitance state or the second active switch 8 is connected with the second capacitor C2, the antenna signal can be shorted in a preset working frequency band and plays a role of tuning a signal self-resonance point, the first radiator 1 and the second radiator 3 are in a shorted state in the working frequency band, the second radiator 3 and the first radiator 1 form an electrical connection in the working frequency band, the second radiator 3 is used as a part of the antenna of the first radiator 1, the variable capacitor 7 or the second capacitor C2 is equivalently connected with the first radiator 1 and the second radiator 3, and form a whole, at this time, the antenna forms a PIFA antenna form and has the working frequency band f1.
As shown in fig. 4, when the first active switch 5 is grounded through the corresponding matching device 6, which can be equivalent to changing the shape of the second radiator 3, and the variable capacitor 7 is in a large-capacity state or the second active switch 8 is turned on the first capacitor C1, the first radiator 1 and the second radiator 3 are in an open state in the operating frequency range, the second radiator 3 and the first radiator 1 do not form an electrical connection in the operating frequency range, but have signal electromagnetic coupling radiation, at this time, the second radiator 3 has electromagnetic coupling parasitic to the first radiator 1, at this time, the antenna forms a conventional design of a main antenna radiator and a grounding parasitic antenna radiator, and has a main antenna operating frequency range f2 and a parasitic frequency range f3.
As shown in fig. 5, when the first active switch 5 is turned off and the variable capacitor 7 is in a small capacitance state or the second active switch 8 is turned on the second capacitor C2, the antenna signal can be shorted in a preset operating frequency band and a tuning signal self-resonance point is achieved, the first radiator 1 and the second radiator 3 are in a shorted state in the operating frequency band range, the second radiator 3 and the first radiator 1 form an electrical connection in the operating frequency band, the second radiator 3 serves as an antenna branch of the first radiator and directly feeds with an antenna signal source, and at this time, the antenna forms a multi-branch antenna design, which has a main antenna operating frequency band f2 and a parasitic frequency band f4.
As shown in fig. 6, when the first active switch 5 is turned off and the variable capacitor 7 is in a large capacity state or the second active switch 8 is turned on the first capacitor C1, the first radiator 1 and the second radiator 3 are in an off state within the operating frequency range, and the second radiator 3 is an independent metal body and is excited by the first radiator 1 through electromagnetic coupling, so as to become an antenna branch of the first radiator 1 and couple with an antenna signal source, and at this time, the antenna forms a multi-branch antenna design, which has a main antenna operating frequency range f2 and a parasitic frequency range f5.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (3)
1. A mobile terminal antenna apparatus, characterized in that: the antenna comprises a first radiator (1), wherein the first radiator (1) is connected with a first signal output end of a processor (4) through a signal source (2), one end of a second radiator (3) is connected with the first radiator (1) through a switch circuit, the other end of the second radiator (3) is grounded through a first active switch (5), a second signal output end of the processor (4) is connected with a control signal input end of the switch circuit, a third signal output end of the processor (4) is connected with a control signal input end of the first active switch (5), and the on-off of the switch circuit and the first active switch (5) is controlled through the processor (4) so as to realize a single antenna multiple configuration; -a matching device (6), said first active switch (5) being connected to ground through the matching device (6);
the switching circuit is a variable capacitor (7); or the switching circuit is formed by connecting more than two capacitors in series with a second active switch (8), one end of the second active switch (8) is connected with the first radiator (1), the other end of the second active switch (8) is connected with the second radiator (3) through a first capacitor C1 and a second capacitor C2 which are connected in parallel, the signal output end of the processor (4) is connected with the control signal input end of the second active switch (8), the first capacitor C1 is a large capacity value, and the second capacitor C2 is a small capacity value; the switching action between the second radiator (3) and the first radiator (1) is realized through the capacitive effect of the variable capacitor, so that the second radiator (3) can be used as an antenna branch or a parasitic radiator to be reconfigurable;
When the first active switch (5) is grounded through a corresponding matching device (6), the shape of the second radiator (3) can be equivalently changed, and the variable capacitor (7) is in a small capacity state or the second active switch (8) is connected with the second capacitor C2, an antenna signal can be shorted in a preset working frequency band and plays a role of tuning a signal self-resonance point, the first radiator (1) and the second radiator (3) are in a short circuit state in the working frequency band range, the second radiator (3) and the first radiator (1) form electric connection in the working frequency band, the second radiator (3) is used as a part of the first radiator (1) antenna, the variable capacitor (7) or the second capacitor C2 is equivalent to a connecting body for connecting the first radiator (1) and the second radiator (3), and the variable capacitor C7 or the second capacitor C2 is connected with the first radiator (1) to form a whole, and the PIFA antenna forms an antenna form at the moment and has a working frequency band f1;
When the first active switch (5) is grounded through a corresponding matching device (6), the shape of the second radiator (3) can be equivalently changed, and the variable capacitor (7) is in a large capacity state or the second active switch (8) is connected with the first capacitor C1, the first radiator (1) and the second radiator (3) are in an open circuit state in the working frequency range, the second radiator (3) and the first radiator (1) are not electrically connected in the working frequency range, but are provided with signal electromagnetic coupling radiation, at the moment, the second radiator (3) is provided with electromagnetic coupling parasitic to the first radiator (1), at the moment, the antenna forms a conventional main antenna radiator and a grounding parasitic antenna radiator design, and the antenna has a main antenna working frequency range f2 and a parasitic frequency range f3;
when the first active switch (5) is opened and the variable capacitor (7) is in a small capacity state or the second active switch (8) is connected with the second capacitor C2, an antenna signal can be short-circuited in a preset working frequency band and a tuning signal self-resonance point is achieved, the first radiator (1) and the second radiator (3) are in a short-circuited state in the working frequency band range, the second radiator (3) and the first radiator (1) form an electric connection in the working frequency band, the second radiator (3) serves as an antenna branch of the first radiator and is directly fed with an antenna signal source, and at the moment, the antenna forms a multi-branch antenna design with a main antenna working frequency band f2 and a parasitic frequency band f4;
When the first active switch (5) is disconnected and the variable capacitor (7) is in a large capacity state or the second active switch (8) is connected with the first capacitor C1, the first radiator (1) and the second radiator (3) are in a disconnected state within the range of the working frequency band, and the second radiator (3) is an independent metal body and is excited by the first radiator (1) in an electromagnetic coupling mode to become an antenna branch of the first radiator (1) and is coupled with an antenna signal source, at the moment, the antenna forms a multi-branch antenna design and has a main antenna working frequency band f2 and a parasitic frequency band f5.
2. The mobile terminal antenna device of claim 1, wherein: the variable capacitor (7) is divided into a high-resistance state or a low-resistance state according to an operating frequency band, when the variable capacitor (7) is in the high-resistance state, the first radiator (1) and the second radiator (3) are in an open-circuit state, and when the variable capacitor (7) is in the low-resistance state, the first radiator (1) and the second radiator (3) are in a short-circuit state.
3. The mobile terminal antenna device of claim 2, wherein: the matching means (6) comprise a capacitance or an inductance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910123845.2A CN109921178B (en) | 2019-02-19 | 2019-02-19 | Mobile terminal antenna device |
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| CN201910123845.2A CN109921178B (en) | 2019-02-19 | 2019-02-19 | Mobile terminal antenna device |
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| CN109921178A CN109921178A (en) | 2019-06-21 |
| CN109921178B true CN109921178B (en) | 2024-07-09 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350054B (en) * | 2019-08-09 | 2022-12-13 | 青岛海信移动通信技术股份有限公司 | Mobile terminal |
| CN112350078B (en) * | 2019-08-09 | 2022-08-23 | 青岛海信移动通信技术股份有限公司 | Mobile terminal |
| CN110718745B (en) * | 2019-09-02 | 2021-10-08 | 深圳市飞亚达精密科技有限公司 | Multi-frequency multiplexing antenna device and smart watch |
| CN110729550B (en) * | 2019-09-02 | 2021-11-19 | 深圳市飞亚达精密科技有限公司 | Antenna device and intelligent watch |
| CN112531330B (en) * | 2019-09-18 | 2022-11-25 | 青岛海信移动通信技术股份有限公司 | Mobile terminal and mobile terminal accessory equipment |
| CN113871851B (en) * | 2021-08-31 | 2023-07-25 | 荣耀终端有限公司 | Mobile terminal device |
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