CN219419523U - Double-feed-port microstrip antenna, antenna equipment and radar system - Google Patents
Double-feed-port microstrip antenna, antenna equipment and radar system Download PDFInfo
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- CN219419523U CN219419523U CN202223540580.2U CN202223540580U CN219419523U CN 219419523 U CN219419523 U CN 219419523U CN 202223540580 U CN202223540580 U CN 202223540580U CN 219419523 U CN219419523 U CN 219419523U
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Abstract
The utility model provides a double-feed-port microstrip antenna, antenna equipment and a radar system, wherein the double-feed-port microstrip antenna comprises a radiation metal patch, a dielectric substrate, a reflection metal patch and a signal receiving and transmitting module; the radiation metal patch is fixed on the first surface of the medium substrate, the reflection metal patch is covered on the second surface of the medium substrate, a first feed through hole and a second feed through hole are arranged on the radiation metal patch, a transmitting end of the signal receiving and transmitting module is connected with the first feed through hole, a receiving end of the signal receiving and transmitting module is connected with the second feed through hole, a plurality of isolation through holes are arranged between the first feed through hole and the second feed through hole, and therefore current paths and current distribution states generated on the radiation metal patch by radiation signals transmitted by the first feed through hole and received signals transmitted by the second feed through hole are changed, current enrichment areas of the radiation metal patch are enlarged, and isolation between a transmitting feed port and a receiving feed port of the double-feed-port microstrip antenna is improved.
Description
Technical Field
The utility model relates to the field of antennas, in particular to a double-feed port microstrip antenna, antenna equipment and a radar system.
Background
In recent years, microstrip antennas have been widely used in the technical fields of target recognition and environmental awareness, especially in the fields of radar detection, automobile autopilot, unmanned aerial vehicle, and the like.
Devices currently in common use for object recognition and context awareness may include: in intelligent lamps, induction cameras, automatic curtains and various devices and systems which need target recognition and environment sensing capability, a microstrip antenna integrating transceiver is generally integrated in the devices or the systems so as to realize sensing and detection of various characteristics of objects.
However, the integrated microstrip antenna generally has a dual feed port, as shown in fig. 1, for example, a front view of the dual feed port microstrip antenna is shown, which includes a radiating metal patch 1, a first feed via 11 as a transmitting feed port, a second feed via 12 as a receiving feed port, and an isolation via 13 disposed on the radiating metal patch 1, wherein the radiating metal patch 1 is fixed on the surface of the dielectric substrate 2. The microstrip antenna has higher isolation requirements on the transmitting feed port and the receiving feed port, the current enrichment area 17 is shown in fig. 2, the area of the microstrip antenna characterizes the current path and the current distribution state generated by the radiating metal patch of the transmitting signal transmitted by the first feed through hole 11 or the receiving signal transmitted by the second feed through hole 12, when the microstrip antenna is in a working state, the current enrichment area 17 generated by a single anti-interference isolation through hole 13 is smaller, the isolation between the transmitting feed port and the receiving feed port is lower, the coupling interference easily occurs between the transmitting signal and the receiving signal, the transmission quality of the signal is low, and the requirement of signal transmission cannot be met. Therefore, how to enlarge the current enrichment area and improve the isolation between the transmitting feeding port and the receiving feeding port of the dual-feeding port microstrip antenna has become a technical problem to be solved in the industry.
Disclosure of Invention
The utility model provides a double-feed-port microstrip antenna, equipment and a radar system, which are used for solving the problem that the isolation degree between a sending feed port and a receiving feed port of the double-feed-port microstrip antenna is low because a current enrichment area is small.
According to a first aspect of the present utility model there is provided a dual feed microstrip antenna comprising: the device comprises a radiation metal patch, a dielectric substrate, a reflection metal patch and a signal receiving and transmitting module; wherein:
the dielectric substrate comprises a first surface and a second surface which are opposite;
the radiation metal patch is fixed on the first surface of the dielectric substrate, the reflection metal patch is covered on the second surface of the dielectric substrate, a first feed through hole and a second feed through hole are arranged on the radiation metal patch, the first feed through hole and the second feed through hole penetrate through the dielectric substrate and the reflection metal patch respectively, the signal receiving and transmitting module is positioned at the rear side of the reflection metal patch, the transmitting end of the signal receiving and transmitting module is connected with the first feed through hole, the receiving end of the signal receiving and transmitting module is connected with the second feed through hole, N isolation through holes are arranged between the first feed through hole and the second feed through hole, and N is an integer greater than or equal to 2; wherein:
the first feed via is used for transmitting radiation signals;
the second feed-through is used for transmitting a received signal.
Optionally, the radiating metal patch is an even number of polygons or circles.
Optionally, the N isolation vias are all located on a central axis of the radiating metal patch.
Optionally, the distances from the first feed via and the second feed via to the center of the radiating metal patch are equal.
Optionally, the hole diameters of the first feed through hole and the second feed through hole are equal.
Optionally, the N isolation vias have no space or are partially overlapped.
Optionally, the N isolated vias overlap to form a rectangular slot.
Optionally, the N isolated vias do not overlap with each other.
Optionally, the hole diameters of the N isolation vias are equal.
Optionally, N isolation vias penetrate through the dielectric substrate and the reflective metal patch, respectively.
According to a second aspect of the present utility model there is provided an antenna device comprising a dual feed microstrip antenna as provided in any one of the first aspects of the present utility model.
According to a third aspect of the present utility model there is provided a radar system comprising a radar module and a dual feed microstrip antenna as provided in any one of the first aspects of the present utility model;
the transmit port of the radar module is connected to the first feed-through and the receive feed-through is connected to the second feed-through.
According to the dual-feed-port microstrip antenna and antenna equipment provided by the utility model, the radiating metal patch is fixed on the first surface of the dielectric substrate, the reflecting metal patch is covered on the second surface of the dielectric substrate, the radiating metal patch is provided with the first feed through hole and the second feed through hole, the signal receiving and transmitting module is positioned at the rear side of the reflecting metal patch, the transmitting end of the signal receiving module is connected with the first feed through hole, the receiving end of the signal receiving module is connected with the second feed through hole, and a plurality of isolation through holes are arranged between the first feed through hole and the second feed through hole, so that the current paths and the current distribution states generated on the radiating metal patch by taking the first feed through hole as a radiation signal transmitted by a transmitting feed port and taking the second feed through hole as a receiving signal transmitted by a receiving feed port are changed, and the current enrichment area of the radiating metal patch is enlarged, and the isolation between the transmitting feed port and the receiving feed port of the dual-feed-port microstrip antenna is improved.
The radar system provided by the utility model comprises the double-feed-port microstrip antenna and the radar module, wherein the radar module transmits radiation signals and receiving signals to the detection area through the double-feed-port microstrip antenna, and the isolation between the sending feed port and the receiving feed port of the double-feed-port microstrip antenna is improved due to the fact that the double-feed-port microstrip antenna enlarges the current enrichment area of the radiation metal patch, so that the transmission quality of the radiation signals and the receiving signals transmitted by the radar module is ensured.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a front view of a prior art dual feed microstrip antenna;
FIG. 2 is a schematic diagram of a current enrichment region of a dual feed microstrip antenna of the prior art;
FIG. 3 is a side view of a dual feed microstrip antenna in an embodiment of the present utility model;
FIG. 4 is a front view of a dual feed microstrip antenna in accordance with an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a dual feed microstrip antenna according to another embodiment of the present utility model;
fig. 6 is a schematic diagram of a dual-feed microstrip antenna according to another embodiment of the present utility model;
FIG. 7 is a schematic diagram of a current enrichment region of a dual feed microstrip antenna in an embodiment of the present utility model;
FIG. 8 is a schematic diagram of a current enrichment region of a dual feed microstrip antenna according to another embodiment of the present utility model;
reference numerals illustrate:
1-radiating a metal patch;
2-a dielectric substrate;
3-reflective metal patches;
11-a first feed-through;
12-a second feed-through;
13-isolating the via;
14-first isolation vias;
15-a second isolation via;
16-stacking holes;
17-current enrichment region.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical scheme of the utility model is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
In view of the prior art, the problem that the current enrichment area is smaller and the isolation between the transmitting feed port and the receiving feed port of the double-feed port microstrip antenna is lower is difficult to solve. The utility model provides a double-feed-port microstrip antenna, which is characterized in that a radiating metal patch is fixed on a first surface of a dielectric substrate, a reflecting metal patch is covered on a second surface of the dielectric substrate, a first feed through hole and a second feed through hole are arranged on the radiating metal patch, a signal receiving and transmitting module is positioned at the rear side of the reflecting metal patch, a transmitting end of the signal receiving module is connected with the first feed through hole, a receiving end of the signal receiving module is connected with the second feed through hole, a plurality of isolation through holes are arranged between the first feed through hole and the second feed through hole, and therefore a current path and a current distribution state of the radiating metal patch, which are generated by taking the first feed through hole as a radiation signal transmitted by a transmitting feed port and taking the second feed through hole as a receiving signal transmitted by a receiving feed port, are changed, and a current enrichment area of the radiating metal patch is enlarged, so that the isolation between the transmitting feed port and the receiving feed port of the double-feed-port microstrip antenna is improved.
Referring to fig. 3, in an embodiment of the present utility model, a dual-feed microstrip antenna is provided, including: a radiation metal patch 1, a dielectric substrate 2, a reflection metal patch 3 and a signal receiving and transmitting module; wherein:
the dielectric substrate 2 comprises a first surface and a second surface which are opposite;
the radiation metal patch 1 is fixed on a first surface of the dielectric substrate 2, the reflection metal patch 3 is covered on a second surface of the dielectric substrate 2, a first feed through hole 11 and a second feed through hole 12 are arranged on the radiation metal patch 3, the first feed through hole 11 and the second feed through hole 12 penetrate through the dielectric substrate 2 and the reflection metal patch 3 respectively, the signal receiving and transmitting module is positioned at the rear side of the reflection metal patch 3, a transmitting end of the signal receiving and transmitting module is connected with the first feed through hole 11, a receiving end of the signal receiving and transmitting module is connected with the second feed through hole 12, N isolation through holes 13 are arranged between the first feed through hole 11 and the second feed through hole 12, and N is an integer greater than or equal to 2; wherein:
the first feed via 11 is used as a sending feed port of the double-feed port microstrip antenna and is used for transmitting radiation signals;
the second feed via 12 is used as a receiving feed port of the dual feed microstrip antenna for transmitting the received signal.
The radiation metal patch 1 converts the radiation signal into electromagnetic wave to radiate into a detection area, the reflection metal patch 3 is used for forming a resonant cavity with the radiation metal patch 1, fixing the direction of the radiation metal patch 1 for radiating or receiving the electromagnetic wave, reflecting the regular electromagnetic wave back to the radiation metal patch 1 by an object after radiating, and generating the receiving signal on the radiation metal patch 1. On the basis, the transmitting end of the signal receiving and transmitting module transmits a radiation signal to the radiation metal patch 1 through the first feed via 11, and the radiation metal patch 1 transmits a receiving signal to the receiving end of the signal receiving and transmitting module through the second feed via 12.
As a preferred embodiment, the hole diameters of the first and second feed-through holes are equal.
As a preferred embodiment, the dielectric substrate is an FR4 board.
It should be understood that the specific types of dielectric substrates described above are merely examples, and the dielectric substrates of the present utility model are not limited to FR4 boards, and those skilled in the art may select corresponding microwave dielectric materials, such as microwave dielectric ceramics, according to actual needs to achieve the purposes of the embodiment.
In an example, referring to fig. 4 and 5, the radiating metal patch 1 is an even-numbered polygon or circle.
Preferably, N isolation vias 13 are located on the central axis of the radiating metal patch 1.
Specifically, in the example shown in fig. 4, the radiation metal patch 1 is exemplified as being provided with two of the isolation vias. Wherein the radiation metal patch 1 is regular-decagon and is fixed on the first surface of the dielectric substrate 2, and the reflection metal patch 3 (not shown in fig. 4) is covered on the second surface of the dielectric substrate 2; the first isolation via hole 14 and the second isolation via hole 15 are both located on the central axis of the radiating metal patch 1 and located at the center of the radiating metal patch 1, a transmitting end of the signal transceiver module (not shown in the figure) transmits a radiation signal to the radiating metal patch 1 through the first feed via hole 11, and the radiating metal patch 1 transmits a receiving signal to a receiving end of the signal transceiver module through the second feed via hole 12.
In this case, as a preferable mode, the first and second feed vias 11 and 12 are equidistant from the center of the radiating metal patch 1.
It should be understood that the N isolation vias 13 are located on the central axis of the radiating metal patch 1, which is only a preferred mode of the present utility model, and those skilled in the art may select other hole forming modes according to practical situations.
In one embodiment, the first isolation via 14 and the second isolation via 15 do not overlap with each other, as shown in fig. 4.
In this case, in a preferred embodiment, the hole diameters of the N isolation vias 13 are equal, that is, the hole diameters of the first isolation via 14 and the second isolation via 15 are equal.
As another specific embodiment, there is no space or partial overlap between the first isolation via 14 and the second isolation via 15. In one example, as shown in fig. 5, the radiating metal patch 1 is circular and is fixed on the first surface of the dielectric substrate 2, and the reflecting metal patch 3 (not shown in fig. 5) is covered on the second surface of the dielectric substrate 2; the first isolation via 14 and the second isolation via 15 are overlapped to form a stacked hole 16, and the stacked hole 16 represents a rectangular groove on the radiation metal patch 1.
The shape of the stacked hole may be rectangular, elliptical, square, polygonal, diamond, etc., and the shape of the stacked hole is not limited correspondingly, and any conceivable shape is within the scope of the present utility model.
As a preferred embodiment, N isolation vias 13 penetrate through the dielectric substrate and the reflective metal patch 3, respectively, referring to fig. 6, and the first isolation via 14 and the second isolation via 15 penetrate through the dielectric substrate 2 (not shown in fig. 6) and the reflective metal patch 3, respectively. This is because the presence of the via hole of the dielectric substrate or the reflective metal patch 3 does not affect the isolation between the transmitting feed port and the receiving feed port of the dual-feed microstrip antenna.
The working principle of the dual-feed microstrip antenna shown in fig. 4 is specifically described below with reference to the schematic diagram of the current enrichment region shown in fig. 7:
the radiating metal patch 1 is in a regular decagon shape, two feeding through holes deviating from the center point of the radiating metal patch 1 are formed in the regular decagon radiating metal patch 1, the first feeding through holes and the second feeding through holes penetrate through the dielectric substrate and the reflecting metal patch respectively, N isolation through holes are formed between the first feeding through holes and the second feeding through holes, and in one example, the first isolation through holes 14 and the second isolation through holes 15 are located on the central axis of the radiating metal patch 1. The transmitting end of the signal transceiver module transmits a radiation signal to the radiation metal patch 1 through the first feed via 11, the radiation metal patch 1 transmits a receiving signal to the receiving end of the signal transceiver module through the second feed via 12, both the radiation signal and the receiving signal can generate induced current on the radiation metal patch 1, the first isolation via 14 and the second isolation via 15 can change current paths and current distribution states generated by the radiation signal and the receiving signal on the radiation metal patch 1, so that the induced current is expanded in a current enrichment area 17 formed by the radiation metal patch 1, isolation between a transmitting feed port and a receiving feed port is increased, and coupling interference between the radiation signal and the receiving signal is not easy to occur.
Specifically, as shown in fig. 4, the dual-feed microstrip antenna uses an FR4 board as the dielectric substrate 2, and has a thickness h of 1.3mm, a length of 16.4mm, a width of 14mm, a dielectric constant of 4.4, and a loss tangent of 0.02; the reflective metal patch 3 (not shown) has a length of 16.4mm and a width of 14mm; the radiating metal patch 1 is in a regular decagon shape, the circumscribing radius R of the radiating metal patch 1 is 6.69mm, the inscribing radius R of the radiating metal patch is 6.36mm, the hole diameters of the first feed through hole 11 and the second feed through hole 12 are 0.2mm, and the distance between the connecting line center points of the two feed through holes and the center point of the radiating metal patch 1 is 1.34mm and 3.2mm; therefore, the center frequency of the double-feed port microstrip antenna is 5.8GHz, the 10dB bandwidth is 200MHz, and the beam width is about 90 degrees;
in order to improve the isolation of the dual-feed microstrip antenna, please refer to fig. 2, in the prior art, the isolation via hole 13 is located at the center of the radiating metal patch 1, and the hole diameter is 0.2mm, so that the isolation between the transmitting feed port and the receiving feed port of the dual-feed microstrip antenna is-40 dB measured at the center frequency;
referring to fig. 7, the first isolation via hole 14 and the second isolation via hole 15 are located in parallel on the central axis of the radiating metal patch 1, and are 1.2mm away from the central point of the radiating metal patch 1, and the aperture is 0.1mm, where the distance between the centers of the circles of the first isolation via hole 14 and the second isolation via hole 15 is 0.3mm, and by adding the isolation via hole, the isolation between the transmitting feed port and the receiving feed port of the dual-feed port microstrip antenna is-45 dB measured at the central frequency, so that the characteristics of the radiating frequency point, the radiating pattern, the matching degree, and the like of the dual-feed port microstrip antenna are further optimized, and the radiating characteristic is improved.
As a preferred embodiment, referring to fig. 8, the radiating metal patch 1 is circular, a rectangular slot is formed on the radiating metal patch 1, the rectangular slot can be understood as a stacked hole 16 formed by partially overlapping the first isolation via hole 14 and the second isolation via hole 15, the area of the stacked hole 16 is smaller than the sum of the areas of the first isolation via hole 14 and the second isolation via hole 15, and the rectangular slot can change the current paths and the current distribution states of the radiating signal and the receiving signal generated on the radiating metal patch 1, so that the current enrichment area 17 formed by the radiating metal patch 1 is enlarged, and the isolation degree between the radiating metal patch 1 and the transmitting feed port and the receiving feed port is the same as that of the regular decagon radiating metal patch 1.
Specifically, in one example, in the above case, the first isolation via 14 and the second isolation via 15 are partially overlapped and optimized to be a rectangular slot with a length of 0.4mm and a width of 0.2mm, so that the isolation between the transmitting feed port and the receiving feed port of the dual-feed port microstrip antenna measured at the center frequency is-45 dB.
Of course, it should be appreciated that the shape of the radiating metallic patches described above is merely exemplary, and the radiating metallic patches of the present utility model are not limited to an even number of polygons or circles; that is, as long as the first feeding via hole and the second feeding via hole 12 are provided on the radiating metal patch, a plurality of isolation via holes 13 are provided between the first feeding via hole and the second feeding via hole 12, so that the plurality of isolation via holes 13 jointly enlarge the current enrichment area 17 of the radiating metal patch, which is within the protection scope of the present utility model.
In addition, the embodiment of the utility model also provides antenna equipment which comprises the double-feed-port microstrip antenna. By way of example, the device may be a smart light, an inductive camera, an automatic window covering, etc., and may be used in a variety of devices and systems that require target recognition and environmental awareness capabilities
In addition, the embodiment of the utility model also provides a radar system which comprises the double-feed port microstrip antenna and a radar module;
the transmit port of the radar module is connected to the first feed-through and the receive feed-through is connected to the second feed-through.
The radar module radiates and receives corresponding signals to the detection area through the double-feed-port microstrip antenna, and the double-feed-port microstrip antenna enlarges the current enrichment area of the radiating metal patch, so that the isolation between the sending feed port and the receiving feed port of the double-feed-port microstrip antenna is improved, and the quality of the radar module radiating and receiving corresponding signals is improved.
In summary, the present utility model includes a radiating metal patch, a dielectric substrate, a reflecting metal patch, and a signal transceiver module, where the radiating metal patch is fixed on a first surface of the dielectric substrate, the reflecting metal patch is covered on a second surface of the dielectric substrate, a first feed via and a second feed via are disposed on the radiating metal patch, and the signal transceiver module is located at a rear side of the reflecting metal patch, a transmitting end of the signal transceiver module is connected to the first feed via, a receiving end of the signal transceiver module is connected to the second feed via, and a plurality of isolation vias are disposed between the first feed via and the second feed via, so that a current path and a current distribution state generated by the radiating metal patch by using the first feed via as a radiation signal transmitted by a transmitting feed port and using the second feed via as a receiving signal transmitted by a receiving feed port are changed, and a current enrichment area of the radiating metal patch is enlarged, so that isolation between a transmitting feed port and a receiving feed port of a dual-feed microstrip antenna is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (12)
1. A dual feed microstrip antenna comprising: the device comprises a radiation metal patch, a dielectric substrate, a reflection metal patch and a signal receiving and transmitting module; wherein:
the dielectric substrate comprises a first surface and a second surface which are opposite;
the radiation metal patch is fixed on the first surface of the dielectric substrate, the reflection metal patch is covered on the second surface of the dielectric substrate, a first feed through hole and a second feed through hole are arranged on the radiation metal patch, the first feed through hole and the second feed through hole penetrate through the dielectric substrate and the reflection metal patch respectively, the signal receiving and transmitting module is positioned at the rear side of the reflection metal patch, the transmitting end of the signal receiving and transmitting module is connected with the first feed through hole, the receiving end of the signal receiving and transmitting module is connected with the second feed through hole, N isolation through holes are arranged between the first feed through hole and the second feed through hole, and N is an integer greater than or equal to 2; wherein:
the first feed via is used for transmitting radiation signals;
the second feed-through is used for transmitting a received signal.
2. The dual feed microstrip antenna of claim 1, wherein said radiating metallic patch is an even-numbered polygon or circle.
3. The dual feed microstrip antenna of claim 2, wherein N of said isolation vias are located at a central axis of said radiating metal patch.
4. A dual feed microstrip antenna as in claim 3 wherein said first feed via and said second feed via are equidistant from a center of said radiating metal patch.
5. A dual feed microstrip antenna as in claim 3 wherein said first feed via and said second feed via have equal hole diameters.
6. A dual feed microstrip antenna as in claim 3 wherein N of said isolated vias are non-spaced or partially overlapping.
7. The dual feed microstrip antenna of claim 6 wherein N of said isolation vias overlap as a rectangular slot.
8. A dual feed microstrip antenna as in claim 3 wherein N of said isolation vias do not overlap each other.
9. The dual feed microstrip antenna of claim 8 wherein the N isolated vias have equal hole diameters.
10. The dual feed microstrip antenna of any of claims 1-9, wherein N of said isolation vias penetrate said dielectric substrate and said reflective metal patch, respectively.
11. An antenna device comprising a dual feed microstrip antenna according to any of claims 1-10.
12. A radar system comprising a radar module and a dual feed microstrip antenna as claimed in any one of claims 1 to 10;
the transmit port of the radar module is connected to the first feed-through and the receive feed-through is connected to the second feed-through.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223540580.2U CN219419523U (en) | 2022-12-29 | 2022-12-29 | Double-feed-port microstrip antenna, antenna equipment and radar system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223540580.2U CN219419523U (en) | 2022-12-29 | 2022-12-29 | Double-feed-port microstrip antenna, antenna equipment and radar system |
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