CN111244634A - Bottom-fed broadband wide-beam dual-port millimeter wave digital coding antenna - Google Patents
Bottom-fed broadband wide-beam dual-port millimeter wave digital coding antenna Download PDFInfo
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- CN111244634A CN111244634A CN202010104432.2A CN202010104432A CN111244634A CN 111244634 A CN111244634 A CN 111244634A CN 202010104432 A CN202010104432 A CN 202010104432A CN 111244634 A CN111244634 A CN 111244634A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/378—Combination of fed elements with parasitic elements
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Abstract
The invention provides a bottom-fed wide-bandwidth beam dual-port millimeter wave digital coding antenna, which comprises: the antenna comprises an upper-layer radiation patch structure, a lower-layer parasitic patch structure and a double radio frequency connector port; the upper-layer radiation patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and the point-to-point treatment is carried out to form a rectangular strip-shaped surface structure; the lower parasitic patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and is reprocessed at a point to form a rectangular strip-shaped surface structure, and the lower parasitic patch structure is positioned below the upper radiation patch structure and is connected with the radiation patch and the floor through two probes; the double-radio-frequency joint port is arranged at the bottom of the broadband wide-beam double-port millimeter wave digital coding antenna with bottom feed. The quasi-coaxial impedance matching port can be directly connected with a millimeter wave radio frequency connector, and is convenient to connect and use.
Description
Technical Field
The invention relates to the field of antennas, in particular to a bottom-fed wide-bandwidth beam dual-port millimeter wave digital coding antenna, and particularly relates to a millimeter wave digital coding antenna array element with wide-bandwidth wide-angle dual-port feed and a linear array with a large-angle scanning characteristic.
Background
In practical applications, the receiving antenna (transmitting antenna) needs to operate in a wider frequency band to receive signals (transmitting signals), and therefore, the receiving antenna (transmitting antenna) has certain stability in modern disturbing electromagnetic environments, the communication distance needs to be far enough (the noise coefficient needs to be small), the link quality needs to be high enough, and the receiving (transmitting) level needs to be large enough. However, the general antenna has a narrow frequency band and insufficient data capacity in the bandwidth, and due to the shortage of spectrum resources, the rapid development of modern miniaturization and integration, and the large limitation of the low-frequency antenna volume, the narrow-band low-frequency antenna has a need of improvement in terms of military and civil applications. Realizing the millimeter wave antenna with wide band, double ports and wide angle and the extreme requirement of the array element
The patent document "Design and Analysis of a reflection-array Using Slot antenna elements for Ka-band SatCom" proposes a dual-port, array element and antenna array, which have high port isolation and array scanning characteristics of 60 degrees, but the antenna still does not solve the broadband characteristics, and causes inconvenience to users when having high channel capacity.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a bottom-fed wide-bandwidth beam dual-port millimeter wave digital coding antenna.
The invention provides a bottom-fed wide-bandwidth beam dual-port millimeter wave digital coding antenna which is characterized by comprising: the antenna comprises an upper-layer radiation patch structure, a lower-layer parasitic patch structure and a double radio frequency connector port; the upper-layer radiation patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and in order to prevent the instability of the point-to-point structure in the processing of a millimeter wave band, the point-to-point structure is reprocessed to form a rectangular strip-shaped surface structure; the lower parasitic patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and is retreated at the point-to-point position to form a rectangular strip-shaped surface structure in order to prevent the instability of the point-to-point structure in the processing of a millimeter wave band, and the lower parasitic patch structure is positioned below the upper radiation patch structure and is connected with the radiation patch and the floor through two probes; the double-radio-frequency joint port is arranged at the bottom of the broadband wide-beam double-port millimeter wave digital coding antenna with bottom feed.
Preferably, the entire upper radiating patch structure, lower parasitic patch structure and dual rf connector port are mirror symmetric along plane (1, -1, 0). Therefore, the two ports have certain polarization cross and port isolation characteristics. An array consisting of dual port antennas has a large angular scanning characteristic.
Preferably, the upper radiating patch structure is located at the uppermost layer, and is fed upward by the feeding probe.
Preferably, the dual radio frequency connector port adopts a millimeter wave radio frequency connector.
Preferably, a discrete gridding binary coding form is adopted to realize an irregular patch structure; when rectangular grid is optimized, due to the uncontrollable property of a point-to-point structure caused by processing errors, the point-to-point structure is converted into a rectangular strip structure, so that the processing in a millimeter wave band is facilitated; the lower parasitic patch structure comprises two metal short circuit columns; the metal short-circuit column penetrates through the lower parasitic patch to be connected with the upper radiation patch structure and the floor.
Preferably, the two dual radio frequency connector ports mirror-symmetrical about the plane (1, -1, 0) have polarization cross-over characteristics, port isolation characteristics.
Preferably, the broadband wide-angle dual-port millimeter wave digital coding antenna forms a broadband wide-angle dual-port millimeter wave digital coding antenna array; the wide-band wide-angle double-port millimeter wave digital coding antenna array adopts a 1-8 linear array structure.
Preferably, the distance between the broadband wide-angle dual-port millimeter wave digital coding antenna arrays is 1/2 lambda.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the traditional broadband antenna, the broadband antenna has wider bandwidth in a millimeter wave frequency band.
2. The invention can realize dual-port radiation and has good port isolation.
3. The invention has wide angle characteristic, and the formed array has wide angle scanning characteristic.
4. The antenna has high efficiency and high gain.
5. The quasi-coaxial impedance matching port can be directly connected with a millimeter wave radio frequency connector, and is convenient to connect and use.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an exploded view of the structure of the present invention.
Fig. 3 is a schematic diagram of binary coding of an upper-layer radiation patch structure of a dual-layer broadband wide-angle millimeter wave dual-port antenna according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of binary coding of a lower-layer parasitic patch structure of a dual-layer broadband wide-angle millimeter wave dual-port antenna according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an array formed by a double-layer broadband wide-angle millimeter wave dual-port antenna in the embodiment of the invention.
FIG. 6 is a cross-sectional view of an array formed by the dual-layer broadband wide-angle millimeter wave dual-port antenna and the dual-layer broadband wide-angle millimeter wave dual-port antenna according to an embodiment of the present invention, along a z-x plane of a rectangular coordinate system (with a coaxial line axis as a z-axis).
Fig. 7 is a schematic diagram of a direction curve at a center resonant frequency obtained by simulation in the embodiment of the present invention.
Fig. 8 is a graph illustrating scattering coefficient curves within a frequency band obtained by a first simulation according to an embodiment of the present invention.
Fig. 9 is a diagram illustrating a scattering coefficient curve within a frequency band obtained by a second simulation in the embodiment of the present invention.
Fig. 10 is a graph illustrating scattering coefficient curves within a frequency band obtained by a third simulation in the embodiment of the present invention.
Fig. 11 is a schematic diagram of an in-band gain variation curve obtained by simulation in the embodiment of the present invention.
Fig. 12 is a schematic diagram of variation of scanning characteristics of an array pattern obtained by simulation in an embodiment of the present invention.
In the figure:
1 is an upper radiation patch structure 4 is a common feed connector
2 is a lower parasitic patch structure 5 which is a metal short circuit column
3 is a metal floor
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1 to 12, the bottom-fed wide bandwidth beam dual-port millimeter wave digital coding antenna provided by the present invention is characterized by comprising: the antenna comprises an upper-layer radiation patch structure, a lower-layer parasitic patch structure and a double radio frequency connector port; the upper-layer radiation patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and in order to prevent the instability of the point-to-point structure in the processing of a millimeter wave band, the point-to-point structure is reprocessed to form a rectangular strip-shaped surface structure; the lower parasitic patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and is retreated at the point-to-point position to form a rectangular strip-shaped surface structure in order to prevent the instability of the point-to-point structure in the processing of a millimeter wave band, and the lower parasitic patch structure is positioned below the upper radiation patch structure and is connected with the radiation patch and the floor through two probes; the double-radio-frequency joint port is arranged at the bottom of the broadband wide-beam double-port millimeter wave digital coding antenna with bottom feed.
Preferably, the entire upper radiating patch structure, lower parasitic patch structure and dual rf connector port are mirror symmetric along plane (1, -1, 0). Therefore, the two ports have certain polarization cross and port isolation characteristics. An array consisting of dual port antennas has a large angular scanning characteristic.
Preferably, the upper radiating patch structure is located at the uppermost layer, and is fed upward by the feeding probe.
Preferably, the dual radio frequency connector port adopts a millimeter wave radio frequency connector.
Preferably, a discrete gridding binary coding form is adopted to realize an irregular patch structure; when rectangular grid is optimized, due to the uncontrollable property of a point-to-point structure caused by processing errors, the point-to-point structure is converted into a rectangular strip structure, so that the processing in a millimeter wave band is facilitated; the lower parasitic patch structure comprises two metal short circuit columns; the metal short-circuit column penetrates through the lower parasitic patch to be connected with the upper radiation patch structure and the floor.
Preferably, the two dual radio frequency connector ports mirror-symmetrical about the plane (1, -1, 0) have polarization cross-over characteristics, port isolation characteristics.
Preferably, the broadband wide-angle dual-port millimeter wave digital coding antenna forms a broadband wide-angle dual-port millimeter wave digital coding antenna array; the wide-band wide-angle double-port millimeter wave digital coding antenna array adopts a 1-8 linear array structure.
Preferably, the distance between the broadband wide-angle dual-port millimeter wave digital coding antenna arrays is 1/2 lambda.
Compared with the traditional broadband antenna, the broadband antenna has wider bandwidth in a millimeter wave frequency band. The invention can realize dual-port radiation and has good port isolation. The invention has wide angle characteristic, and the formed array has wide angle scanning characteristic. The antenna has high efficiency and high gain. The quasi-coaxial impedance matching port can be directly connected with a millimeter wave radio frequency connector, and is convenient to connect and use.
Specifically, in an embodiment, as shown in fig. 1 to 5, the wideband wide-angle dual-port millimeter wave digital coding antenna and the array formed by the antennas provided by the present invention include: the antenna comprises an upper-layer radiating patch structure 1, a lower-layer parasitic patch structure 2, a metal floor 3 and a common millimeter wave feed connector 4. The whole antenna structure is of a double-layer structure, the upper-layer radiation patch structure 1 is the uppermost layer, and the lower-layer parasitic patch structure 2 is the second layer. The upper radiation patch structure 1 is in a discrete gridding binary coding form, and an irregular patch structure is realized. When rectangular grid is optimized, the point-to-point structure is converted into a rectangular strip structure due to the uncontrollable nature of processing errors of the point-to-point structure, and processing at millimeter wave bands is facilitated. The upper radiation patch structure is positioned on the uppermost layer and is fed upwards by the feed probe. The lower parasitic patch structure 2 is in a discrete gridding binary coding form, and an irregular patch structure is realized. When rectangular grid is optimized, the point-to-point structure is converted into a rectangular strip structure due to the uncontrollable nature of processing errors of the point-to-point structure, and processing at millimeter wave bands is facilitated. The lower parasitic patch structure 2 is connected with the upper radiation patch structure 1 and the floor 3 by two metal short-circuit columns 5 passing through the upper parasitic patch structure. The upper radiation patch structure 1, the lower parasitic patch structure 2, the two metal short-circuit columns 5 and the common feed connector 4 are mirror-symmetrical along the mirror surface (1, -1, 0).
Furthermore, the array element antenna is translated along a direction to form a linear array, and in order to prevent grating lobes, the distance between linear array elements is smaller than 1/2 lambda.
The ultra-wideband working principle of the invention is as follows:
as shown in fig. 1-5, the dual-layer broadband wide-angle millimeter wave dual-port antenna and the array radio frequency excitation composed of the antenna provided by the invention are fed in from the cable structure 3 at the bottom, a resonance point is realized at the upper layer radiation patch structure 1, a resonance point close to the upper layer radiation patch structure 1 is generated by the lower layer parasitic patch structure 2, and then the two resonance points are overlapped by introducing an inductance effect through the connection of the metal short circuit column 5, so that the broadband characteristic is realized. The upper radiation patch structure 1 and the lower parasitic patch structure 2 are in a discrete gridding binary coding form, and irregular patch structures are realized. The specific binary encoding is shown in fig. 3 and 4, where 0 represents the air slot and 1 represents the metal conductor. In the third drawing and the fourth drawing, the white rectangle represents 1, the black rectangle represents 0, the white rectangles are connected to form an irregular patch, and the point-to-point structure is converted into a rectangular strip structure due to the uncontrollable property of a processing error during rectangular grid optimization, so that the processing in a millimeter wave band is facilitated. The wideband is set as a primary goal when using the PSO optimization algorithm for binary encoding optimization. Therefore, the antenna has a good broadband characteristic as a whole. Wherein, the upper radiation patch structure 1, the lower parasitic patch structure 2, the two metal short-circuit columns 5 and the common feed connector 4 are in mirror symmetry along the mirror surface (1, -1, 0). The antenna has good port isolation and certain polarization isolation. The array element antenna is translated along a direction to form a linear array, and the distance between the linear array elements is smaller than 1/2 lambda for preventing grating lobes from occurring.
As shown in fig. 7, it can be seen that the main radiation direction is the broadside direction, and the 3dB beamwidth is large.
As shown in FIG. 8, the port reflection coefficient of the antenna 1 is less than-10 dB at the frequency band 22-33GHz, which is the first-out from FIG. 8(a), and the antenna has good impedance bandwidth characteristics. And since the antenna is mirror-symmetrical by the (1, -1, 0) plane, the reflection coefficient of the 1 port is the same as that of the 2 port, as shown in fig. 8 (c). The transmission coefficient from the antenna 1 port to the antenna 2 port (S21) is as shown in fig. 8(b), and it can be seen that S21 is less than-10 dB above the frequency band 21-33GHz and less than-15 dB after 23GHz, the port isolation is better, and since the antenna is a reciprocal structure, S21 is S12, the transmission coefficient from the antenna 2 port to the antenna 1 port (S12) is not given
As shown in fig. 9, it can be seen that the in-band gain is greater than 4 dB. The gain is stable in-band.
As shown in fig. 10, it can be seen that the pattern has good scanning characteristics between-50 to +50 degrees at some frequency points.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A bottom-fed wide-bandwidth-beam dual-port millimeter wave digital coding antenna is characterized by comprising: the antenna comprises an upper-layer radiation patch structure, a lower-layer parasitic patch structure and a double radio frequency connector port;
the upper-layer radiation patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and the point-to-point treatment is carried out to form a rectangular strip-shaped surface structure;
the lower parasitic patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and is reprocessed at a point to form a rectangular strip-shaped surface structure, and the lower parasitic patch structure is positioned below the upper radiation patch structure and is connected with the radiation patch and the floor through two probes;
the double-radio-frequency joint port is arranged at the bottom of the broadband wide-beam double-port millimeter wave digital coding antenna with bottom feed.
2. The bottom-fed broadband wide-beam dual-port millimeter wave digitally encoded antenna of claim 1, wherein the entire upper radiating patch structure, lower parasitic patch structure and dual radio frequency connector port are mirror symmetric along plane (1, -1, 0).
3. The bottom-fed broadband wide-beam two-port millimeter wave digitally encoded antenna of claim 1, wherein the upper radiating patch structure is located at the uppermost layer, fed upwards by the feed probe.
4. The bottom-fed broadband wide-beam dual-port millimeter wave digitally encoded antenna of claim 1, wherein the dual radio frequency connector port employs a millimeter wave radio frequency connector.
5. The bottom-fed broadband wide-beam dual-port millimeter wave digitally encoded antenna of claim 1, wherein the lower parasitic patch structure comprises two metal shorting posts;
the metal short-circuit column penetrates through the lower parasitic patch to be connected with the upper radiation patch structure and the floor.
6. The bottom-fed broadband wide-beam two-port millimeter wave digitally encoded antenna of claim 2, wherein two dual radio frequency sub-ports mirror-symmetrical about plane (1, -1, 0) have polarization cross-over characteristics, port isolation characteristics.
7. The bottom-fed broadband wide-beam dual-port millimeter wave digital coding antenna as claimed in claim 1, wherein the broadband wide-angle dual-port millimeter wave digital coding antenna constitutes a broadband wide-angle dual-port millimeter wave digital coding antenna array;
the wide-band wide-angle double-port millimeter wave digital coding antenna array adopts a 1-8 linear array structure.
8. The bottom-fed broadband wide-beam dual-port millimeter wave digitally encoded antenna of claim 7, wherein the pitch of the array of broadband wide-angle dual-port millimeter wave digitally encoded antennas is 1/2 λ.
9. A bottom-fed wide-bandwidth-beam dual-port millimeter wave digital coding antenna is characterized by comprising: the antenna comprises an upper-layer radiation patch structure, a lower-layer parasitic patch structure and a double radio frequency connector port;
the upper-layer radiation patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and the point-to-point treatment is carried out to form a rectangular strip-shaped surface structure;
the lower parasitic patch structure adopts a discrete gridding binary coding form to realize an irregular patch structure, and is reprocessed at a point to form a rectangular strip-shaped surface structure, and the lower parasitic patch structure is positioned below the upper radiation patch structure and is connected with the radiation patch and the floor through two probes;
the double-radio-frequency joint port is arranged at the bottom of the broadband wide-beam double-port millimeter wave digital coding antenna with bottom feed;
the whole upper-layer radiation patch structure, the lower-layer parasitic patch structure and the dual radio frequency connector port are in mirror symmetry along a plane (1, -1, 0);
the upper radiation patch structure is positioned on the uppermost layer and is fed upwards by the feed probe;
the ports of the double radio frequency connectors adopt millimeter wave radio frequency connectors;
the lower parasitic patch structure comprises two metal short circuit columns;
the metal short-circuit column penetrates through the lower parasitic patch to be connected with the upper radiation patch structure and the floor;
two dual radio frequency connector ports which are mirror symmetric about a plane (1, -1, 0) have polarization cross characteristics and port isolation characteristics;
the broadband wide-angle dual-port millimeter wave digital coding antenna forms a broadband wide-angle dual-port millimeter wave digital coding antenna array;
the wide-band wide-angle double-port millimeter wave digital coding antenna array adopts a 1-by-8 linear array structure;
the distance between the broadband wide-angle dual-port millimeter wave digital coding antenna arrays is 1/2 lambda.
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| CN202010104432.2A CN111244634A (en) | 2020-02-20 | 2020-02-20 | Bottom-fed broadband wide-beam dual-port millimeter wave digital coding antenna |
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| CN202010104432.2A CN111244634A (en) | 2020-02-20 | 2020-02-20 | Bottom-fed broadband wide-beam dual-port millimeter wave digital coding antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054446A (en) * | 2021-03-17 | 2021-06-29 | 中国人民解放军海军潜艇学院 | Ku frequency channel series feed antenna design system |
| CN116722363A (en) * | 2023-08-10 | 2023-09-08 | 成都天成电科科技有限公司 | Composite structure broadband phased array antenna unit and antenna |
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2020
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| EP2081251A1 (en) * | 2008-01-15 | 2009-07-22 | Nokia Siemens Networks Oy | Patch antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054446A (en) * | 2021-03-17 | 2021-06-29 | 中国人民解放军海军潜艇学院 | Ku frequency channel series feed antenna design system |
| CN116722363A (en) * | 2023-08-10 | 2023-09-08 | 成都天成电科科技有限公司 | Composite structure broadband phased array antenna unit and antenna |
| CN116722363B (en) * | 2023-08-10 | 2023-10-20 | 成都天成电科科技有限公司 | Composite structure broadband phased array antenna unit and antenna |
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Application publication date: 20200605 |