CN210092340U - Terminal equipment and tunable antenna system thereof - Google Patents
Terminal equipment and tunable antenna system thereof Download PDFInfo
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- CN210092340U CN210092340U CN201921459128.9U CN201921459128U CN210092340U CN 210092340 U CN210092340 U CN 210092340U CN 201921459128 U CN201921459128 U CN 201921459128U CN 210092340 U CN210092340 U CN 210092340U
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Abstract
The application discloses a terminal device and a tunable antenna system thereof, wherein the tunable antenna system comprises an antenna and a tuning circuit; the feed point of the antenna is used for being connected with a feed line; the tuning circuit comprises a control unit and a plurality of electronic switches, wherein the first ends of the electronic switches are connected with branch end points of the antenna, and the second ends of the electronic switches are grounded; the control unit is used for controlling the on-off of each electronic switch. Therefore, the antenna can be adjusted in the grounding point by the aid of the tuning circuit, the radiation state of the antenna is changed, and the resonance state and the resonance frequency of the antenna can be adjusted. The antenna is reconstructed under the condition that the structure of the antenna is not changed, the antenna is simple and low in cost, the resonant frequency bandwidth of the antenna is effectively expanded, the antenna has a wider frequency coverage range, and the applicability and the economic benefit of a product are improved.
Description
Technical Field
The present application relates to the field of antenna technologies, and in particular, to a terminal device and a tunable antenna system thereof.
Background
The antenna provides the conversion of guided waves on a transmission line to free space waves, which is an essential component required in radio systems.
With the rapid development of mobile communication, in order to be compatible with the communication capabilities of new and old frequency bands, there is currently a higher requirement for the supported frequency bands of smart devices. However, since the antenna is easily limited and influenced by various factors such as environment, it is often difficult to have a bandwidth covering all required frequency bands, and the current higher communication requirements of people cannot be met. In view of the above, it is an important need for those skilled in the art to provide a solution to the above technical problems.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a simple, effective and low-cost tunable antenna system and a terminal device, so that the resonant frequency bandwidth of an antenna can be expanded, and the applicability and the economic benefit of a product can be improved.
To solve the above technical problem, in a first aspect, the present application discloses a tunable antenna system, including an antenna and a tuning circuit; the feed point of the antenna is used for being connected with a feed line; the tuning circuit comprises a control unit and a plurality of electronic switches, wherein the first ends of the electronic switches are connected with branch end points of the antenna, and the second ends of the electronic switches are grounded; the control unit is used for controlling the on-off of each electronic switch.
Optionally, the electronic switch comprises a first electronic switch and a second electronic switch; the branch end point corresponding to the first electronic switch is far away from the feeding point compared with the branch end point corresponding to the second electronic switch;
when the first electronic switch is switched on and the second electronic switch is switched off, the antenna is represented as a Loop antenna;
when the first electronic switch is switched off and the second electronic switch is switched off, the antenna is a single-pole antenna;
when the first electronic switch is switched off and the second electronic switch is switched on, the antenna is represented as an IFA antenna.
Optionally, each of the electronic switches is a diode, a first end of the electronic switch is an anode, and a second end of the electronic switch is a cathode.
Optionally, the antenna is an M-shaped antenna, and includes a main transverse arm, a first vertical branch arm, a second vertical branch arm, and a third vertical branch arm;
the first end of the first vertical branch arm is connected with the left end point of the main transverse arm; the first end of the third vertical branch arm is connected with the right end point of the main transverse arm; a first end of the second vertical branch arm is connected to a first point on the main transverse arm, the first point being distant from a right end point and close to a left end point of the main transverse arm.
Optionally, the second end of the first vertical branch arm serves as the feeding point of the antenna and is used for being connected with a feeder line;
a second end of the third vertical branch arm is used as a first branch end point of the antenna and is connected with an anode of a first diode in the tuning circuit;
and the second end of the second vertical branch arm is used as a second branch endpoint of the antenna and is connected with the anode of a second diode in the tuning circuit.
Optionally, the length of the main transverse arm is 60 mm; the lengths of the first vertical branch arm, the second vertical branch arm and the third vertical branch arm are all 10 mm; the distance between the first point and the left end point is 1.4 mm.
Optionally, the antenna further comprises a transverse branch arm connected to the second vertical branch arm.
Optionally, the antenna further comprises an L-shaped coupling element; the L-shaped coupling element comprises a vertical coupling arm and a transverse coupling arm, the vertical coupling arm is located on the right side of the third vertical branch arm and is grounded, and the transverse coupling arm is located above the main transverse arm.
Optionally, the method further comprises: and the matching circuit is arranged between the feed point and the feed line and between the branch end point of the antenna and the first end of the electronic switch and is used for carrying out impedance matching on the antenna.
Optionally, the matching circuit is a pi-type circuit.
Optionally, the method further comprises: and the filter circuit is connected between the second end of each electronic switch and the ground wire.
In a second aspect, the present application also discloses a terminal device comprising any one of the tunable antenna systems as described above.
The tunable antenna system provided by the application comprises an antenna and a tuning circuit; the feed point of the antenna is used for being connected with a feed line; the tuning circuit comprises a control unit and a plurality of electronic switches, wherein the first ends of the electronic switches are connected with branch end points of the antenna, and the second ends of the electronic switches are grounded; the control unit is used for controlling the on-off of each electronic switch.
Therefore, the antenna can be adjusted in the grounding point by the aid of the tuning circuit, the radiation state of the antenna is changed, and the resonance state and the resonance frequency of the antenna can be adjusted. The antenna is reconstructed under the condition that the structure of the antenna is not changed, the antenna is simple and low in cost, the resonant frequency bandwidth of the antenna is effectively expanded, the antenna has a wider frequency coverage range, and the applicability and the economic benefit of a product are improved. The terminal equipment provided by the application also has the beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a schematic structural diagram of a tunable antenna system disclosed in an embodiment of the present application;
FIG. 2 is a graph of scattering parameter spectra of the antenna of FIG. 1 in different operating states;
fig. 3 is a schematic structural diagram of another tunable antenna system disclosed in the embodiment of the present application;
fig. 4 is a schematic structural diagram of another tunable antenna system disclosed in the embodiment of the present application.
Detailed Description
The core of the application lies in providing a simple, effective and low-cost tunable antenna system and a terminal device, so as to expand the resonant frequency bandwidth of the antenna and improve the applicability and economic benefits of products.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
With the rapid development of mobile communication, in order to be compatible with the communication capabilities of new and old frequency bands, there is currently a higher requirement for the supported frequency bands of smart devices. However, since the antenna is easily limited and influenced by various factors such as environment, it is often difficult to have a bandwidth covering all required frequency bands, and the current higher communication requirements of people cannot be met. In view of the above, the present application provides a tunable antenna system, which can effectively solve the above problems.
Referring to fig. 1, an embodiment of the present application discloses a tunable antenna system, which mainly includes:
the tunable antenna system provided by the embodiment of the application comprises: an antenna 10 and a tuning circuit 20; the feed point of the antenna 10 is used for connecting with a feed line; the tuning circuit 20 includes a control unit 201 and a plurality of electronic switches, a first end of each electronic switch is connected to a branch end of the antenna 10, and a second end of each electronic switch is grounded; the control unit 201 is used for controlling the on/off of each electronic switch.
It should be noted that the tunable antenna system provided in the embodiment of the present application may be specifically applied to terminal devices that require wireless communication, such as smart speakers, vehicle-mounted tablets, smart robots, smart visual doorbells, and smart watches.
In order to effectively widen the antenna resonant frequency bandwidth and improve the resonant coverage of the antenna 10 without changing the antenna 10 itself, the tunable antenna system provided in the embodiment of the present application is provided with the tuning circuit 20, which can be used to adjust the operating state of the antenna 10 and further change the resonant frequency of the antenna 10.
Specifically, the tuning circuit 20 includes a control unit 201 and a plurality of electronic switches, where the electronic switches are used as grounding switches connected to the antenna 10, and the control unit 201 is used to control on/off of each electronic switch. The branch terminals of the antenna 10 are connected to a first terminal of an electronic switch, and a second terminal of the electronic switch is grounded. When the electronic switch is turned on, the corresponding branch end point on the antenna 10 is grounded to become a grounding point; when the electronic switch is turned off, the corresponding branch terminal on the antenna 10 is not grounded. The different ground states at the ends of the branches combine to correspond to the different radiation states of the antenna 10 and thus to the different resonance states and resonance frequencies of the antenna 10. Therefore, the tuning circuit 20 in the embodiment of the present application can effectively expand the applicability of the antenna 10 under different frequency band application requirements.
For example, on the basis of the above, as a specific example, the electronic switch may specifically include a first electronic switch and a second electronic switch; the branch endpoint corresponding to the first electronic switch is far away from the feeding point compared with the branch endpoint corresponding to the second electronic switch;
when the first electronic switch is switched on and the second electronic switch is switched off, the antenna is represented as a Loop antenna;
when the first electronic switch is switched off and the second electronic switch is switched off, the antenna is a single-pole antenna;
when the first electronic switch is switched off and the second electronic switch is switched on, the antenna is represented as an IFA antenna.
The antenna has various common shapes, such as a loop shape, an inverted F shape, a strip shape, a slot shape, etc., and one skilled in the art can select the shape of the antenna 10 by itself according to the requirements of the practical application scenario, and select a part or all of branch terminals on the antenna 10 as a ground point to be connected to the grounded electronic switch in the tuning circuit 20 by itself.
It should be further noted that the electronic switch in the tuning circuit 20 may be implemented by using a diode, a MOS transistor, a switch, and the like, and the control unit 201 in the tuning circuit 20 may be implemented by using a related control circuit in the terminal device where the tunable antenna system is located. This is not further limited by the present application.
The tunable antenna system provided by the embodiment of the application comprises an antenna 10 and a tuning circuit 20; the feed point of the antenna 10 is used for connecting with a feed line; the tuning circuit 20 includes a control unit 201 and a plurality of electronic switches, a first end of each electronic switch is connected to a branch end of the antenna 10, and a second end of each electronic switch is grounded; the control unit 201 is used for controlling the on/off of each electronic switch.
It can be seen that the present application can adjust the grounding point of the antenna 10 by using the tuning circuit 20, change the radiation state of the antenna 10, and then adjust the resonance state and the resonance frequency of the antenna 10. According to the antenna 10 reconstruction method and the antenna 10 reconstruction device, the antenna 10 is reconstructed under the condition that the structure of the antenna 10 is not changed, simplicity and low cost are achieved, the resonant frequency bandwidth of the antenna 10 is effectively expanded, the antenna 10 has a wider frequency coverage range, and the applicability and the economic benefit of products are improved.
Based on the above, as a specific embodiment, in the tunable antenna system provided in the embodiment of the present application, each electronic switch is a diode, a first end of the electronic switch is an anode, and a second end of the electronic switch is a cathode.
Specifically, in the present embodiment, whether the branch terminal of the antenna 10 is grounded or not can be controlled by using the conduction performance of the diode. The control output of the control unit 201 may particularly be connected to the anode of the diode for controlling the anode voltage of the diode. When the anode voltage of the diode is higher than the cathode voltage by a certain threshold value, namely the switching-on threshold value of the diode, the diode is conducted, and the corresponding branch endpoint is grounded and becomes a grounding point.
On the basis of the above, as a specific embodiment, in the tunable antenna system provided in the embodiment of the present application, the antenna 10 is an M-shaped antenna, and includes a main transverse arm 101, a first vertical branch arm 102, a second vertical branch arm 103, and a third vertical branch arm 104;
the first end of the first vertical branch arm 102 is connected with the left end point of the main transverse arm 101; the first end of the third vertical branch arm 104 is connected with the right end point of the main transverse arm 101; the first end of the second vertical branch arm 103 is connected to a first point on the main transverse arm 101, which is remote from the right end point and close to the left end point of the main transverse arm 101.
Wherein, the second end of the first vertical branch arm 102 is used as a feeding point of the antenna 10 for connecting with a feeder line; a second end of the third vertical branch arm 104, which serves as a first branch end point of the antenna 10, is connected to an anode of a first diode D1 in the tuning circuit 20; the second end of the second vertical branch arm 103 serves as a second branch end point of the antenna 10 and is connected to the anode of the second diode D2 in the tuning circuit 20.
Further, as a specific example, the length of the main transverse arm 101 is 60 mm; the lengths of the first vertical branch arm 102, the second vertical branch arm 103 and the third vertical branch arm 104 are all 10 mm; the distance between the first point and the left end point is 1.4 mm. The width of each antenna branch arm may be 3 mm.
It should be noted that the technical solution of the present application is not limited to the specific antenna 10 structure shown in fig. 1, and those skilled in the art may select the antenna 10 with other shape structures according to the actual application requirements. The following will describe the reconstruction effect of the antenna 10 of the present application by taking the M-shaped antenna shown in fig. 1 as an example.
Referring to fig. 2, fig. 2 is a spectrum diagram of scattering parameters of the antenna shown in fig. 1 under different operating conditions.
As shown in fig. 2, when the first diode D1 is turned on and the second diode D2 is turned off, the grounding point of the antenna 10 is a branch end point far from the feeding point, and the antenna 10 is represented as a LOOP antenna, and the antenna resonance is generated in the 1/2 wavelength frequency range; when the first diode D1 is turned off and the second diode D2 is turned off, since no branch end is grounded, the antenna 10 is implemented as a MONOPOLE type, i.e., a MONOPOLE antenna, and the antenna resonance is generated in a 1/4 wavelength frequency range; when the first diode D1 is turned off and the second diode D2 is turned on, the grounding point of the antenna 10 is a branch point near the feeding point, and the antenna 10 is represented by an IFA (Inverted-F) antenna, and the antenna resonance is generated in the 1/4 wavelength frequency range.
By means of different on-off state combinations of diodes in the tuning circuit 20, the antenna 10 has multiple resonance states, multiple operation modes of LOOP, MONOPOLE and IFA, and multi-band frequency coverage of the antenna 10 is effectively achieved.
On the basis of the above, as a specific embodiment, the tunable antenna system provided in the embodiment of the present application further includes: and a matching circuit provided between the feeding point and the feeding line, between a branch end point of the antenna 10 and the first end of the electronic switch, for impedance matching the antenna 10.
Specifically, in order to match the antenna impedance with the feeder impedance to reduce reflected waves and improve signal strength, a matching circuit is further provided in this embodiment. Further, the matching circuit may be a pi-type circuit. The pi-type circuit is realized based on inductance and capacitance elements, and is named because the arrangement condition of devices is similar to a letter pi.
On the basis of the above, as a specific embodiment, the tunable antenna system provided in the embodiment of the present application further includes: and the filter circuit is connected between the second end of each electronic switch and the ground wire.
Specifically, a filter circuit is further provided in the present embodiment, so as to eliminate interference of the signal of the antenna 10 to the baseband. In one embodiment, the filter circuit may specifically comprise a capacitor and an inductor in parallel.
Referring to fig. 3, the present application discloses yet another tunable antenna system. On the basis of the above, in the tunable antenna system provided in the embodiment of the present application, the antenna 10 further includes the transverse branch arm 105 connected to the second vertical branch arm 103.
In a particular embodiment, the length of the transverse branch arm 105 may be in particular 28mm, while the connection point of the transverse branch arm 105 with the second vertical branch arm 103 is at a distance of 1.5mm from the first point on the main transverse arm 101.
The introduction of the transverse branch arm 105 can obtain a resonant frequency with a higher frequency, and further effectively broaden the frequency coverage of the antenna 10. The length of the transversal branch arm 105 can be selected by the person skilled in the art according to the frequency band of the antenna 10 supported by the terminal device.
Referring to fig. 4, the present application discloses yet another tunable antenna system. Based on the above, in the tunable antenna system provided in the embodiment of the present application, the antenna 10 further includes an L-shaped coupling element 106; l-shaped coupling element 106 comprises a vertical coupling arm located to the right of third vertical branch arm 104 and connected to ground, and a transverse coupling arm located above main transverse arm 101.
In a specific embodiment, the vertical coupling arm has a length of 12.5mm and is at a distance of 2mm from the third vertical branch arm 104; the length of the transverse coupling arm is 70mm and the distance from the main transverse arm 101 is 2.5 mm.
The L-shaped coupling element 106 may be implemented by using a metal strip of the terminal device itself, or may be an antenna strip added separately. L-shaped coupling element 106 may be specifically removably mounted so that L-shaped coupling element 106 may be removed when not needed or not effective.
Further, the present application also discloses a terminal device comprising any one of the tunable antenna systems as described above.
As mentioned previously, the terminal devices include, but are not limited to, smart speakers, vehicle tablets, smart robots, smart visual doorbells, smart watches, and the like.
It can be seen that, in the terminal device provided in the present application, the grounding point of the antenna 10 can be adjusted by using the tuning circuit 20, so as to change the radiation state of the antenna 10, and further adjust the resonance state and the resonance frequency of the antenna 10. According to the antenna 10 reconstruction method and the antenna 10 reconstruction device, the antenna 10 is reconstructed under the condition that the structure of the antenna 10 is not changed, simplicity and low cost are achieved, the resonant frequency bandwidth of the antenna 10 is effectively expanded, the antenna 10 has a wider frequency coverage range, and the applicability and the economic benefit of products are improved.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the equipment disclosed by the embodiment, the description is relatively simple because the equipment corresponds to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the present application.
Claims (10)
1. A tunable antenna system comprising an antenna and a tuning circuit; the feed point of the antenna is used for being connected with a feed line; the tuning circuit comprises a control unit and a plurality of electronic switches, wherein the first ends of the electronic switches are connected with branch end points of the antenna, and the second ends of the electronic switches are grounded; the control unit is used for controlling the on-off of each electronic switch.
2. The tunable antenna system of claim 1, wherein the electronic switch comprises a first electronic switch and a second electronic switch; the branch end point corresponding to the first electronic switch is far away from the feeding point compared with the branch end point corresponding to the second electronic switch;
when the first electronic switch is switched on and the second electronic switch is switched off, the antenna is represented as a Loop antenna;
when the first electronic switch is switched off and the second electronic switch is switched off, the antenna is a single-pole antenna;
when the first electronic switch is switched off and the second electronic switch is switched on, the antenna is represented as an IFA antenna.
3. The tunable antenna system of claim 1, wherein each of the electronic switches is a diode, a first terminal of the electronic switch is an anode, and a second terminal of the electronic switch is a cathode.
4. The tunable antenna system of claim 3, wherein the antenna is an M-shaped antenna comprising a main transverse arm, a first vertical branch arm, a second vertical branch arm, a third vertical branch arm;
the first end of the first vertical branch arm is connected with the left end point of the main transverse arm; the first end of the third vertical branch arm is connected with the right end point of the main transverse arm; a first end of the second vertical branch arm is connected to a first point on the main transverse arm, the first point being distant from a right end point and close to a left end point of the main transverse arm.
5. The tunable antenna system of claim 4,
the second end of the first vertical branch arm is used as the feed point of the antenna and is connected with a feeder line;
a second end of the third vertical branch arm is used as a first branch end point of the antenna and is connected with an anode of a first diode in the tuning circuit;
and the second end of the second vertical branch arm is used as a second branch endpoint of the antenna and is connected with the anode of a second diode in the tuning circuit.
6. The tunable antenna system of claim 5, wherein the length of the primary transverse arm is 60 mm; the lengths of the first vertical branch arm, the second vertical branch arm and the third vertical branch arm are all 10 mm; the distance between the first point and the left end point is 1.4 mm.
7. The tunable antenna system of claim 6, wherein the antenna further comprises a transverse branch arm connected to the second vertical branch arm.
8. The tunable antenna system of claim 7, wherein the antenna further comprises an L-shaped coupling element; the L-shaped coupling element comprises a vertical coupling arm and a transverse coupling arm, the vertical coupling arm is located on the right side of the third vertical branch arm and is grounded, and the transverse coupling arm is located above the main transverse arm.
9. The tunable antenna system of any one of claims 1 to 8, further comprising:
and the matching circuit is arranged between the feed point and the feed line and between the branch end point of the antenna and the first end of the electronic switch and is used for carrying out impedance matching on the antenna.
10. A terminal device, characterized in that it comprises a tunable antenna system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921459128.9U CN210092340U (en) | 2019-09-03 | 2019-09-03 | Terminal equipment and tunable antenna system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921459128.9U CN210092340U (en) | 2019-09-03 | 2019-09-03 | Terminal equipment and tunable antenna system thereof |
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| CN210092340U true CN210092340U (en) | 2020-02-18 |
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| CN201921459128.9U Active CN210092340U (en) | 2019-09-03 | 2019-09-03 | Terminal equipment and tunable antenna system thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165545A (en) * | 2020-09-29 | 2021-01-01 | 维沃移动通信有限公司 | Wearable electronic device, antenna control method, and storage medium |
| CN113067131A (en) * | 2021-03-25 | 2021-07-02 | 维沃移动通信有限公司 | Antenna, antenna module and electronic equipment |
| CN113346241A (en) * | 2021-06-23 | 2021-09-03 | 东莞市小精灵教育软件有限公司 | 5G dual-frenquency MIMO antenna structure and intelligent wearing equipment |
| CN113410622A (en) * | 2021-07-01 | 2021-09-17 | 深圳市锐尔觅移动通信有限公司 | Antenna radiator, antenna device, and electronic apparatus |
| CN113471681A (en) * | 2021-07-02 | 2021-10-01 | 安徽安努奇科技有限公司 | Polymorphic antenna structure and electronic equipment |
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2019
- 2019-09-03 CN CN201921459128.9U patent/CN210092340U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165545A (en) * | 2020-09-29 | 2021-01-01 | 维沃移动通信有限公司 | Wearable electronic device, antenna control method, and storage medium |
| CN113067131A (en) * | 2021-03-25 | 2021-07-02 | 维沃移动通信有限公司 | Antenna, antenna module and electronic equipment |
| CN113346241A (en) * | 2021-06-23 | 2021-09-03 | 东莞市小精灵教育软件有限公司 | 5G dual-frenquency MIMO antenna structure and intelligent wearing equipment |
| CN113410622A (en) * | 2021-07-01 | 2021-09-17 | 深圳市锐尔觅移动通信有限公司 | Antenna radiator, antenna device, and electronic apparatus |
| CN113471681A (en) * | 2021-07-02 | 2021-10-01 | 安徽安努奇科技有限公司 | Polymorphic antenna structure and electronic equipment |
| CN113471681B (en) * | 2021-07-02 | 2023-09-26 | 安徽安努奇科技有限公司 | Multi-form antenna structure and electronic equipment |
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