CN208298996U - Power distributing network, liquid crystal antenna and communication equipment - Google Patents
Power distributing network, liquid crystal antenna and communication equipment Download PDFInfo
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- CN208298996U CN208298996U CN201820998625.5U CN201820998625U CN208298996U CN 208298996 U CN208298996 U CN 208298996U CN 201820998625 U CN201820998625 U CN 201820998625U CN 208298996 U CN208298996 U CN 208298996U
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 127
- 238000004891 communication Methods 0.000 title claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 78
- 239000000758 substrate Substances 0.000 claims description 35
- 230000005855 radiation Effects 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000002609 medium Substances 0.000 description 46
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000006163 transport media Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
The embodiments of the present invention provide a kind of power distributing network, the liquid crystal antenna including the power distributing network, and the communication equipment including the liquid crystal antenna.The power distributing network is configured to using in liquid crystal antenna, and including multiple cascade power dividers.Each power divider includes the first microstrip line, transmission medium area and reference electrode, and wherein the tangent value of the dielectric loss angle of the transmission medium in transmission medium area is less than the tangent value of the dielectric loss angle of the liquid crystal in liquid crystal antenna.
Description
Technical Field
The utility model relates to a communication technology field generally. More particularly, the present invention relates to a power distribution network, a liquid crystal antenna including the power distribution network, and a communication apparatus employing the liquid crystal antenna.
Background
In a typical liquid crystal array antenna system, a power distribution network distributes input power equally to multiple output ports in a two-to-two power divider cascade. The power distribution network is generally required to complete the feeding of the elements without disrupting or having a small impact on the continuity of other structures. The power divider can be divided into a microstrip structure power divider and a cavity power divider according to different structures. In the liquid crystal array antenna, a microstrip structure power divider is generally employed. Compared with the cavity power divider, the microstrip structure power divider has larger isolation and higher integration, but larger insertion loss. Accordingly, there is a need in the art for a low loss power distribution network suitable for high efficiency liquid crystal antennas.
SUMMERY OF THE UTILITY MODEL
In view of the above, an aspect of the present invention provides a power distribution network configured to be used in a liquid crystal antenna, and including: a plurality of cascaded power dividers, each power divider comprising a first microstrip line, a transmission medium region, and a reference electrode, wherein a tangent of a dielectric loss angle of a transmission medium in the transmission medium region is smaller than a tangent of a dielectric loss angle of liquid crystal in the liquid crystal antenna.
According to some embodiments of the invention, the first microstrip line comprises a plurality of different impedance microstrip lines, and each power divider further comprises a first impedance transformer electrically coupled between the different impedance first microstrip lines.
According to some embodiments of the invention, the transmission medium in the transmission medium zone is air.
According to some embodiments of the invention, the width of the first microstrip line satisfies the following formula:
wherein,representing the characteristic impedance of the first microstrip line,representing the effective dielectric constant of the transmission medium in the transmission medium region,which represents the permeability of the transmission medium in the region of the transmission medium,the width of the first microstrip line is shown,representing the thickness of the transmission medium region.
Another aspect of the present invention provides a liquid crystal antenna. The liquid crystal antenna comprises a first substrate and a second substrate which are oppositely arranged; a plurality of radiating elements arranged on one side of the first substrate far away from the second substrate; any of the above power distribution networks configured to feed electromagnetic signals to the plurality of radiating elements; and a phase shifter. The phase shifter includes: the liquid crystal display device includes a plurality of liquid crystal regions disposed between a first substrate and a second substrate, a reference electrode disposed between the first substrate and the plurality of liquid crystal regions, and a second microstrip line disposed between the second substrate and the plurality of liquid crystal regions. The plurality of liquid crystal regions correspond to the plurality of radiation elements one to one, and each radiation element at least partially overlaps with the orthographic projection of the corresponding liquid crystal region on the second substrate. The transmission medium area of each power divider is arranged between the adjacent liquid crystal areas, the reference electrode of each power divider is arranged between the first substrate and the transmission medium area, and the first microstrip line of each power divider is arranged between the second substrate and the transmission medium area. The tangent of the dielectric loss angle of the transmission medium in the transmission medium region of each power divider is smaller than the tangent of the dielectric loss angle of the liquid crystal in the liquid crystal region.
According to some embodiments of the invention, the transport medium region is separated from the adjacent liquid crystal region by a retaining wall.
According to some embodiments of the present invention, the retaining wall is made of frame sealing glue.
According to some embodiments of the present invention, the liquid crystal antenna further includes a second impedance transformer electrically coupled between the adjacent first microstrip line and the second microstrip line.
According to some embodiments of the invention, the width of the second microstrip line satisfies the following formula:
wherein,representing the characteristic impedance of the second microstrip line,represents the effective dielectric constant of the liquid crystal in the liquid crystal region,denotes the permeability of liquid crystal in the liquid crystal region,the width of the first microstrip line is shown,indicating the thickness of the liquid crystal region.
Another aspect of the utility model provides a communication equipment, this communication equipment adopts any kind of above-mentioned liquid crystal antenna.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the invention in any manner.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention. It should be noted that the dimensions shown in the figures are merely schematic and are not intended to limit the invention in any way.
Fig. 1 schematically illustrates a top view of a conventional liquid crystal antenna.
Fig. 2 schematically illustrates a top view of a liquid crystal antenna comprising a power distribution network according to an embodiment of the invention.
Fig. 3 schematically illustrates a cross-sectional view of the liquid crystal antenna in the a-a' direction in fig. 2.
Fig. 4 schematically illustrates a cross-sectional view of the liquid crystal antenna in the direction B-B' in fig. 2.
Fig. 5 shows simulation results of transmission loss of the microstrip line in the liquid crystal.
Fig. 6 shows simulation results of transmission loss of the microstrip line in air.
With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 schematically illustrates a top view of a conventional liquid crystal antenna. As shown in fig. 1, the liquid crystal antenna 100 includes a plurality of radiating elements 101, as well as a power distribution network and a phase shifter. The power distribution network comprises a plurality of cascaded power dividers 104, each power divider 104 comprises a microstrip line 105, 105' and a corresponding part of the liquid crystal region 103 enclosed by the frame sealing glue 102. The power distribution network is configured to feed electromagnetic signals to the individual radiating elements 101.
In an exemplary embodiment, further, in order to prevent energy loss in transmission, when the power divider 104 includes microstrip lines 105 and 105' of different impedances, as shown in fig. 1, the power divider 104 further includes an impedance transformer 106 electrically coupled between the microstrip lines 105 and 105' of different impedances so as to match characteristic impedances of the microstrip lines 105 and 105 '.
In addition, as will be understood by those skilled in the art, the liquid crystal antenna 100 should also include other elements that enable it to function properly, such as a reference electrode that forms an electric field with the microstrip lines 105, 105 'to adjust the orientation of the liquid crystal molecules, a controller that provides a low-frequency voltage signal to the microstrip lines 105, 105' to control the orientation of the liquid crystal molecules accordingly, and the like.
In the liquid crystal antenna 100 shown in fig. 1, the reference electrode, the microstrip line 107, and the liquid crystal region 103 realize the function of a phase shifter. In the liquid crystal antenna 100, the power distribution network feeds electromagnetic signals to the respective radiation elements 101 in equal amplitude and in phase, the phase shifter changes the phase of the fed electromagnetic signals by changing the dielectric constant of the liquid crystal, and the phase-changed electromagnetic signals are transmitted through the radiation elements 101. By applying different voltages to the liquid crystal molecules corresponding to each radiating element 101 through the microstrip line 107 and the reference electrode, the liquid crystal molecules will be deflected to different degrees, so that the phase of the fed electromagnetic signal will be changed differently.
However, the present inventors have recognized that in the liquid crystal antenna shown in fig. 1, the phase shift function needs to be implemented by the liquid crystal, and thus the loss of the electromagnetic signal in the liquid crystal is inevitable. However, since the power divider is used only for transmitting electromagnetic signals in phase with equal amplitude without a phase shift function, the liquid crystal antenna 100 shown in fig. 1 uses a liquid crystal having a large transmission loss as a transmission medium to increase the transmission medium loss of the liquid crystal antenna.
In view of this, embodiments of the present invention provide a power distribution network. Fig. 2 schematically illustrates a top view of a liquid crystal antenna 200 including a power distribution network according to an embodiment of the present invention, fig. 3 schematically illustrates a cross-sectional view of the liquid crystal antenna 200 in a-a 'direction in fig. 2, and fig. 4 schematically illustrates a cross-sectional view of the liquid crystal antenna 200 in a B-B' direction in fig. 2. As shown in fig. 2 to 4, the liquid crystal antenna 200 includes a first substrate 201 and a second substrate 202 which are disposed opposite to each other. A plurality of radiating elements 203 are arranged on a side of the first substrate 201 remote from the second substrate 202. The liquid crystal antenna 200 comprises a power distribution network configured to feed electromagnetic signals to the plurality of radiating elements 203. The power distribution network includes a plurality of cascaded power dividers 205. Each power divider 205 includes a transmission medium region 208, a first microstrip line 211 disposed between the second substrate 202 and the transmission medium region 208, and a reference electrode 206 disposed between the first substrate 201 and the transmission medium region 208. As shown in fig. 2, the transmission medium regions 208 of the plurality of power dividers 205 are contiguous with each other. Further, the liquid crystal antenna 200 includes a phase shifter. The phase shifter includes a plurality of liquid crystal regions 204 disposed between a first substrate 201 and a second substrate 202, a reference electrode 206 disposed between the first substrate 201 and the plurality of liquid crystal regions 204, and a second microstrip line 207 disposed between the second substrate 202 and the plurality of liquid crystal regions 204. The second microstrip line 207 is configured to cooperate with the reference electrode 206 to control the orientation of the liquid crystal molecules in each liquid crystal region 204.
In particular, the plurality of liquid crystal regions 204 correspond one-to-one to the plurality of radiation elements 203, each radiation element 203 at least partially overlaps with an orthographic projection of the corresponding liquid crystal region 204 on the second substrate 202, and the transmission medium region 208 is disposed between adjacent liquid crystal regions 204, as shown in fig. 3 and 4. Also, the tangent value of the dielectric loss angle of the transmission medium in the transmission medium region 208 of each power divider 205 is smaller than the tangent value of the dielectric loss angle of the liquid crystal in the liquid crystal region 204.
It should be noted that although fig. 2 schematically illustrates one 2 x 2 liquid crystal array antenna, the inventive concept is not limited thereto, but may be applied to a liquid crystal antenna comprising any number of elements. Further, the utility model discloses a concept not only is applicable to liquid crystal microstrip antenna, also is applicable to the integrative liquid crystal phased array antenna of receiving and dispatching.
In the above embodiments of the present invention, the liquid crystal region is provided in the region where the phase shifter function is needed to be implemented, so as to ensure the phase shift function of the phase shifter at a large angle, and in other regions, the power distribution network uses another transmission medium different from the liquid crystal, and the dielectric loss angle of the transmission medium is smaller than that of the liquid crystal. As used herein, the term "dielectric loss angle" is also referred to as the dielectric phase angle, which is the ratio of the amount of power and no power distributed in a dielectric medium at alternating voltage, and reflects the magnitude of the energy loss per unit volume within the dielectric medium. Compared with the liquid crystal antenna 100 shown in fig. 1, the power distribution network of the liquid crystal antenna 200 can greatly reduce the transmission loss generated by the liquid crystal in the power distribution network on the premise of ensuring that the input signals are equally distributed to the array elements in the same amplitude and phase by replacing the transmission medium in the region except the region where the phase shifter function needs to be realized with the transmission medium with a smaller dielectric loss angle (i.e., less energy loss in unit volume).
In an exemplary embodiment, as shown in fig. 2 and 4, the first microstrip line 211 includes a plurality of different impedance microstrip lines 211 and 211', and each of the power dividers 205 further includes a first impedance transformer 209 electrically coupled between the different impedance microstrip lines 211 and 211'. When the load impedance is different from the characteristic impedance of the microstrip line or two sections of microstrip lines with different characteristic impedances are connected, the transmitted signal can be reflected to generate transmission loss, so that impedance matching can be achieved by using an impedance converter between the load needing impedance matching and the microstrip line or the two sections of microstrip lines, and the transmission loss is reduced. Thus, as used herein, the term "impedance transformer" may also be referred to as an impedance matcher. In the 2 x 2 liquid crystal array antenna shown in fig. 2, an input signal is transmitted to each array element in equal amplitude and in phase by a one-to-two power divider cascade mode. At each branch point, a first impedance transformer 209 is provided to achieve impedance matching of the power distribution network.
In some example embodiments, the transmission medium in the transmission medium zone 208 is air. In other words, the transmission medium region 208 is filled with air. In this way, the manufacturing process of the liquid crystal antenna can be simplified, and the manufacturing cost of the liquid crystal antenna can be reduced.
Alternatively, as shown in fig. 2, the transport medium region 208 and the adjacent liquid crystal region 204 may be separated by a retaining wall 210. In an exemplary embodiment, the retaining wall 210 may be made of frame sealing glue. For example, in the manufacturing process, different transmission medium regions inside the array antenna are isolated and distinguished through the frame sealing glue, and liquid crystal is dripped in a region where the phase shifter function needs to be realized, so that the large-angle phase shifting function of the phase shifter is ensured.
In particular, in an exemplary embodiment, the width of the first microstrip line may satisfy the following equation:
wherein,representing the characteristic impedance of the first microstrip line,representing the effective dielectric constant of the transmission medium in the transmission medium region 208,representing the permeability of the transmission medium in the transmission medium region 208,the width of the first microstrip line is shown,representing the thickness of the transmission medium region 208.
Similarly, in an exemplary embodiment, the width of the second microstrip line 207 may satisfy the following equation:
wherein,representing the characteristic impedance of the second microstrip line 207,represents the effective dielectric constant of the liquid crystal in the liquid crystal region 204,indicating the permeability of the liquid crystal in the liquid crystal region 204,indicating the width of the second microstrip line 207,indicating the thickness of the liquid crystal region 204.
In an exemplary embodiment, as shown in fig. 3 and 4, the liquid crystal antenna 200 may further optionally include a first alignment layer 212 between the liquid crystal region 204 and the second substrate 202, and a second alignment layer 213 between the liquid crystal region 204 and the first substrate 201. The first alignment layer 212 and the second alignment layer 213 cooperate with each other to set the initial alignment of the liquid crystal region 204.
Fig. 5 and 6 show simulation results of transmission loss when the microstrip line employs liquid crystal and air as transmission media, respectively. Because the power distribution network mainly comprises microstrip lines, the difference of different power distribution networks mainly lies in that the lengths of the microstrip lines are different, and the transmission loss of the microstrip lines is in a linear relation with the lengths of the microstrip lines, the loss of the power distribution network comprising other microstrip lines with different lengths can be estimated through the loss of the microstrip lines with fixed lengths. As can be seen from comparing fig. 5 and fig. 6, the difference between the transmission loss of the microstrip line in the two different transmission media is more obvious under the same power distribution network structure. For example, as shown in fig. 5 and 6, at a frequency of 12.5GHz, the transmission loss of the air transmission medium is reduced by 2.2111dB compared to that of the liquid crystal transmission medium, and thus transforming part of the liquid crystal into air will greatly improve the transmission efficiency of the microstrip line.
Turning to fig. 4, due to the change of the transmission medium, the widths of the first microstrip line 211 and the second microstrip line 207 are different on the premise of different transmission media, the same thickness, and the same characteristic impedance. In order to reduce transmission loss, a second impedance transformer 215 may be added at the connection of the first microstrip line 211 and the second microstrip line 207. The second impedance transformer 215 starts at the dam 210, and its length and line width are determined by the dielectric constant of the dam 210 (particularly, frame sealing adhesive). That is, different types of the dam walls 210 correspond to the second impedance transformer 215 having different lengths and widths.
Further, the embodiment of the present invention further provides a communication device, and the communication device adopts any one of the above liquid crystal antennas.
In such a communication device, a liquid crystal region is provided in a region where a phase shifter function is to be implemented to ensure a large-angle phase shifting function of the phase shifter, and in other regions, the power distribution network employs another transmission medium different from liquid crystal, the transmission medium having a dielectric loss angle smaller than that of the liquid crystal. By replacing the transmission medium in the region other than the region where the phase shifter function needs to be implemented with a transmission medium having a smaller dielectric loss angle (i.e., less energy loss in unit volume), the power distribution network of the liquid crystal antenna in the communication device can greatly reduce the transmission loss generated by the liquid crystal in the power distribution network on the premise of ensuring that the input signal is equally distributed to each array element in the same amplitude and phase.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled," and the like, are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly. It should be noted that the features of the above embodiments may be used in any combination without conflict.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A power distribution network configured for use in a liquid crystal antenna and comprising:
a plurality of cascaded power dividers, each power divider comprising a first microstrip line, a transmission medium region, and a reference electrode, wherein a tangent of a dielectric loss angle of a transmission medium in the transmission medium region is smaller than a tangent of a dielectric loss angle of liquid crystal in the liquid crystal antenna.
2. The power distribution network of claim 1, wherein the first microstrip line comprises a plurality of different impedance microstrip lines, and each power divider further comprises a first impedance transformer electrically coupled between the different impedance first microstrip lines.
3. The power distribution network of claim 1, wherein the transmission medium in the transmission medium zone is air.
4. The power distribution network of claim 1, wherein the width of the first microstrip line satisfies the following equation:
wherein,representing the characteristic impedance of the first microstrip line,representing the effective dielectric constant of the transmission medium in the transmission medium region,which represents the permeability of the transmission medium in the region of the transmission medium,the width of the first microstrip line is shown,representing the thickness of the transmission medium region.
5. A liquid crystal antenna comprising:
the first substrate and the second substrate are oppositely arranged;
a plurality of radiating elements arranged on one side of the first substrate far away from the second substrate;
the power distribution network of any one of claims 1-4, configured to feed electromagnetic signals to the plurality of radiating elements; and
a phase shifter, the phase shifter comprising:
a plurality of liquid crystal regions disposed between the first substrate and the second substrate;
a reference electrode disposed between the first substrate and the plurality of liquid crystal regions; and
a second microstrip line disposed between the second substrate and the plurality of liquid crystal regions,
wherein,
the plurality of liquid crystal regions correspond to the plurality of radiation elements one by one, and each radiation element at least partially overlaps with the orthographic projection of the corresponding liquid crystal region on the second substrate;
the transmission medium area of each power divider is arranged between the adjacent liquid crystal areas, the reference electrode of each power divider is arranged between the first substrate and the transmission medium area, and the first microstrip line of each power divider is arranged between the second substrate and the transmission medium area.
6. The liquid crystal antenna according to claim 5, wherein the transmission medium region is separated from the adjacent liquid crystal region by a dam.
7. The liquid crystal antenna according to claim 6, wherein the dam is made of frame sealing glue.
8. The liquid crystal antenna of claim 5, further comprising a second impedance transformer electrically coupled between adjacent first and second microstrip lines.
9. The liquid crystal antenna according to claim 5, wherein the width of the second microstrip line satisfies the following equation:
wherein,representing the characteristic impedance of the second microstrip line,represents the effective dielectric constant of the liquid crystal in the liquid crystal region,denotes the permeability of liquid crystal in the liquid crystal region,the width of the first microstrip line is shown,indicating the thickness of the liquid crystal region.
10. A communication device employing the liquid crystal antenna according to any one of claims 5 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820998625.5U CN208298996U (en) | 2018-06-27 | 2018-06-27 | Power distributing network, liquid crystal antenna and communication equipment |
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| CN201820998625.5U CN208298996U (en) | 2018-06-27 | 2018-06-27 | Power distributing network, liquid crystal antenna and communication equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020001519A1 (en) * | 2018-06-27 | 2020-01-02 | 京东方科技集团股份有限公司 | Power distribution network, liquid crystal antenna and communication device |
| CN111740200A (en) * | 2020-07-30 | 2020-10-02 | 南京星腾通信技术有限公司 | Power divider capable of continuously phase modulating based on liquid crystal substrate |
| WO2021027870A1 (en) * | 2019-08-14 | 2021-02-18 | 京东方科技集团股份有限公司 | Phase shifter and antenna |
| CN113219688A (en) * | 2020-02-05 | 2021-08-06 | 群创光电股份有限公司 | Electronic device |
| CN113451718A (en) * | 2021-06-30 | 2021-09-28 | 上海天马微电子有限公司 | Phase shifter and antenna |
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2018
- 2018-06-27 CN CN201820998625.5U patent/CN208298996U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020001519A1 (en) * | 2018-06-27 | 2020-01-02 | 京东方科技集团股份有限公司 | Power distribution network, liquid crystal antenna and communication device |
| US11450972B2 (en) | 2018-06-27 | 2022-09-20 | Beijing Boe Optoelectronics Technology Co., Ltd. | Power distribution network, liquid crystal antenna and communication device |
| WO2021027870A1 (en) * | 2019-08-14 | 2021-02-18 | 京东方科技集团股份有限公司 | Phase shifter and antenna |
| EP4016724A4 (en) * | 2019-08-14 | 2022-09-21 | BOE Technology Group Co., Ltd. | Phase shifter and antenna |
| US11962054B2 (en) | 2019-08-14 | 2024-04-16 | Beijing Boe Sensor Technology Co., Ltd. | Phase shifter and antenna |
| CN113219688A (en) * | 2020-02-05 | 2021-08-06 | 群创光电股份有限公司 | Electronic device |
| CN113219688B (en) * | 2020-02-05 | 2023-05-23 | 群创光电股份有限公司 | Electronic device |
| CN111740200A (en) * | 2020-07-30 | 2020-10-02 | 南京星腾通信技术有限公司 | Power divider capable of continuously phase modulating based on liquid crystal substrate |
| CN113451718A (en) * | 2021-06-30 | 2021-09-28 | 上海天马微电子有限公司 | Phase shifter and antenna |
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