CN214898876U - Radar antenna - Google Patents
Radar antenna Download PDFInfo
- Publication number
- CN214898876U CN214898876U CN202120577977.5U CN202120577977U CN214898876U CN 214898876 U CN214898876 U CN 214898876U CN 202120577977 U CN202120577977 U CN 202120577977U CN 214898876 U CN214898876 U CN 214898876U
- Authority
- CN
- China
- Prior art keywords
- radiation
- radar antenna
- phase
- microstrip
- electromagnetic wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a radar antenna, it includes: a plurality of radiation units for emitting electromagnetic waves; the microstrip unit is respectively connected with the plurality of radiation units and the signal source and is used for transmitting the electromagnetic waves provided by the signal source to each radiation unit; and the phase adjusting unit is connected with the microstrip unit and is used for adjusting the phase of the electromagnetic wave transmitted by the microstrip unit. The utility model provides a radar antenna, it can adjust the phase place of the electromagnetic wave of transmission to improve radar antenna's gain; and can avoid carrying out the refabrication to radar antenna, and then reduce manufacturing cost.
Description
Technical Field
The utility model relates to an electromagnetic wave technical field specifically, relates to a radar antenna.
Background
In the vehicle-mounted collision avoidance radar system, a radar antenna for transmitting and receiving signals is a key component. Currently, a radar antenna in a conventional vehicle-mounted anti-collision radar system generally employs a PCB (printed circuit board) as a substrate, and the radar antenna is fixed on the substrate.
However, the radar antenna is usually made of a dielectric plate, so that the uniformity and the processing precision of the dielectric plate material can affect the performance of transmitting and receiving signals of the antenna. Moreover, the higher the frequency of the transmission signal is, the higher the requirement of the processing precision of the radar antenna is, and particularly, when the transmission and reception signal of the radar antenna belongs to the millimeter wave frequency band, the processing precision of the radar antenna needs to reach 0.1 mm. On the contrary, if the uniformity and the processing precision of the dielectric plate material are low, the phase shift of the transmitted dielectric wave and the energy internal dispersion of the dielectric wave can be caused, the problem that the gain of the radar antenna is reduced can be caused, and the detection accuracy of the vehicle-mounted anti-collision radar system is reduced.
Moreover, because most of the current vehicle-mounted anti-collision radar antennas adopt the integrally formed series-fed antenna array, after the processing is finished, the feeding phase of each radiation unit is fixed,
adjustment is not possible, and therefore when the uniformity of the dielectric sheet and the machining accuracy do not meet the requirements, it is possible to perform remanufacturing only, which increases the manufacturing cost.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a aim at solving at least one of the technical problem that exists among the prior art, provide a radar antenna, it can adjust the phase place of the electromagnetic wave of transmission to improve radar antenna's gain; and can avoid carrying out the refabrication to the radar antenna that the machining precision is lower, and then reduce manufacturing cost.
In order to realize the utility model discloses an object provides a radar antenna, it includes:
a plurality of radiation units for emitting electromagnetic waves;
the microstrip unit is respectively connected with the plurality of radiation units and the signal source and is used for transmitting the electromagnetic waves provided by the signal source to each radiation unit; and
and the phase adjusting unit is connected with the microstrip unit and is used for adjusting the phase of the electromagnetic wave transmitted by the microstrip unit.
Optionally, the microstrip unit includes a plurality of microstrip lines, output ends of the plurality of microstrip lines are electrically connected to the signal input ends of the plurality of radiation units in a one-to-one correspondence, and input ends of the plurality of microstrip lines are electrically connected to the output end of the signal source.
Optionally, the phase adjusting unit includes a first substrate, a second substrate, a liquid crystal layer, a ground electrode plate, and a plurality of phase control electrode plates; wherein the content of the first and second substances,
the first substrate base plate and the second substrate base plate are oppositely arranged, and the liquid crystal layer is arranged between the first substrate base plate and the second substrate base plate;
the microstrip lines are all arranged on one side, close to the liquid crystal layer, of the first substrate base plate;
the plurality of phase control electrode plates are arranged on one side, close to the liquid crystal layer, of the second substrate base plate, and the plurality of phase control electrode plates and the plurality of microstrip lines are arranged in a one-to-one correspondence mode; the grounding electrode plate is arranged on one side of the first substrate base plate far away from the liquid crystal layer; the phase control electrode plate and the grounding electrode plate are used for forming a phase-shifting electric field used for controlling the arrangement direction of liquid crystal molecules in the liquid crystal layer between the phase control electrode plate and the grounding electrode plate.
Optionally, the phased electrode plate includes a plurality of phased electrode bars, and any two adjacent phased electrode bars are parallel to each other.
Optionally, the phase shift electric field has an adjustment range of 0 to pi/2 for the phase of the electromagnetic wave.
Optionally, the radiation unit includes a plurality of radiation patches, the radiation patches of the plurality of radiation units are connected in series, and each two adjacent radiation units are connected through one microstrip line.
Optionally, a distance between each two adjacent radiation patches is equal to a medium wavelength of the electromagnetic wave.
Optionally, the radiation patch is strip-shaped, and the width direction of the radiation patch is parallel to the axial direction of the radiation unit;
the widths of the radiation patches in the plurality of radiation units are each equal to 0.5 times the medium wavelength of the electromagnetic wave.
Optionally, the radar antenna further includes a signal line, and the signal line is used for being electrically connected to an output end of the signal source;
the input ends of the microstrip lines are electrically connected with the signal lines.
Optionally, the radiation unit includes radiation patches, the radiation patches of the radiation unit are arranged at intervals along the signal line direction, and the distance between two adjacent radiation patches is equal to 0.5-0.8 times of the free space wavelength of the electromagnetic wave.
The embodiment of the utility model provides a following beneficial effect has:
the embodiment of the utility model provides a radar antenna, through setting up the phase adjustment unit who is connected with the microstrip unit to can adjust the phase place of the electromagnetic wave of transmission in the microstrip unit, thereby adjust the phase place of the electromagnetic wave that launches; and because the electromagnetic wave launched by the radar antenna can take place the resonance when appointed phase place (for example:pi/4), the radiation intensity of the electromagnetic wave launched under this state can reach the maximum value, therefore the utility model provides a radar antenna can also be with the phase place regulation of the electromagnetic wave launched to appointed value to make the gain of radar antenna reach the maximum, thereby improve the detection accuracy who uses its radar equipment; meanwhile, the phase of the electromagnetic wave offset due to the low process precision of the radar antenna can be improved, so that when the manufacturing uniformity and the processing precision of the radiation unit and the microstrip unit do not meet the requirements, the radiation unit and the microstrip unit do not need to be manufactured again, and the manufacturing cost is saved.
Drawings
Fig. 1 is a schematic top view of a radar antenna according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a radar antenna provided in an embodiment of the present invention, taken along a line AA' in fig. 1;
fig. 3 is a schematic structural diagram of another radar antenna according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present invention, it is omitted. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used in the present embodiments have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes the radar antenna provided by the present invention in detail with reference to the attached drawings.
Referring to fig. 1, the present embodiment provides a radar antenna, which includes a microstrip unit 2, a phase adjustment unit 3, and a plurality of radiation units 1. Wherein, a plurality of radiation units 1 are used for emitting electromagnetic waves; the microstrip unit 2 is respectively connected with an output end of a signal source (not shown in the figure) and the plurality of radiation units 1, and is used for transmitting the electromagnetic waves provided by the signal source to the radiation units 1; the phase adjusting unit 3 is connected with the microstrip unit 2, and the phase adjusting unit 3 is used for adjusting the phase of the electromagnetic wave in the microstrip unit 2 so as to adjust the phase of the emitted electromagnetic wave; and because the phase place of the electromagnetic wave that is launched by a plurality of radiating element 1 is adjusted when appointed value (for example:pi/4), the electromagnetic wave that a plurality of radiating element 1 were launched can take place the resonance, and under the state of resonance, the gain of radar antenna can reach the maximum value, consequently, the utility model provides a phase place adjusting unit 3 can be through adjusting the phase place of the electromagnetic wave that launches the radar antenna to appointed value, makes the gain of radar antenna reach the biggest, and then can improve the detection precision of the radar system who uses this radar antenna.
The radiation unit 1 and the microstrip unit 2 in the existing radar antenna are generally made of dielectric plates and integrally formed, wherein the feeding phase of each radiation unit 1 is fixed, so that the phase of electromagnetic waves cannot be adjusted after the radiation units are processed. Accordingly, when the uniformity and the processing accuracy of the dielectric plate do not meet the requirements, the radar antenna does not reach the predetermined gain, and the radiation unit 1 and the microstrip unit 2 need to be newly manufactured, which leads to an increase in manufacturing cost. The radar antenna provided by the embodiment can adjust the phase of the emitted electromagnetic wave, and can emit the electromagnetic wave reaching the preset radiation intensity even under the condition that the manufacturing uniformity and/or the processing precision of the radiation unit 1 and the microstrip unit 2 do not meet the requirement, so that the radar antenna with the problems does not need to be manufactured again, and the manufacturing cost is further reduced. In other words, the radiation unit 1 and the microstrip unit 2 in the radar antenna provided by the present embodiment have low requirements on the processing precision and the uniformity of the dielectric plate.
Taking a radar antenna with low uniformity and processing precision of dielectric plate materials of a radiation unit 1 and a microstrip unit 2 as an example, the phase of an electromagnetic wave emitted by the radiation unit 1 has a certain offset, such as pi/3, compared with a preset phase; on this basis, the phase of the transmitted electromagnetic wave can be adjusted by adjusting the phase adjusting unit 3, for example, by pi/3 in the opposite direction, thereby canceling out the offset phase of the electromagnetic wave. The above is only one application method of the radar antenna provided in the present embodiment, wherein the offset amount of the phase of the electromagnetic wave emitted by the radiation unit 1 and the adjustment amount of the phase of the electromagnetic wave by the phase adjustment unit 3 should be determined according to the actual application, and is not limited thereto.
Referring to fig. 2, which is a cross-sectional view of the radar antenna along a direction of a straight line AA' in fig. 1, in some embodiments, the microstrip unit 2 includes a plurality of microstrip lines 21, output ends of the microstrip lines 21 are electrically connected to signal input ends of the radiation units 1 in a one-to-one correspondence, and input ends of the microstrip lines 21 are electrically connected to output ends of a signal source (not shown).
In some embodiments, as shown in fig. 2, the phase adjusting unit 3 includes a first substrate 31, a second substrate 32, a liquid crystal layer 35, a ground electrode plate 33, and a plurality of phase control electrode plates 34. Wherein, the first substrate 31 and the second substrate 32 are oppositely arranged, and the liquid crystal layer 35 is arranged between the first substrate 31 and the second substrate 32; the microstrip lines 21 are all arranged on one side of the first substrate 31 close to the liquid crystal layer 35; the plurality of phased-electrode plates 34 are disposed on the second substrate 32 on the side close to the liquid crystal layer 35, and the plurality of phased-electrode plates 34 are disposed in one-to-one correspondence with the plurality of microstrip lines 21; the ground electrode plate 33 is disposed on a side of the first substrate 31 away from the liquid crystal layer 35; the phase control electrode plate 34 and the ground electrode plate 33 serve to form therebetween a phase-shifting electric field for controlling the alignment direction of liquid crystal molecules in the liquid crystal layer 35. In some embodiments, the first substrate board 31 and the second substrate board 32 are made of insulating glass plates.
The alignment direction of liquid crystal molecules in the liquid crystal material changes with the intensity of an electric field applied thereto, and thus the dielectric coefficient of the liquid crystal material itself is changed; when the electromagnetic wave propagates in the medium, the phase of the electromagnetic wave is shifted due to the change of the dielectric constant; it can be seen that, since the liquid crystal layer 35 in the present embodiment is disposed between the phase electrode plate 34 and the ground electrode plate 33, and a phase-shifting electric field is applied to the liquid crystal layer 35, the arrangement direction of liquid crystal molecules in the liquid crystal layer 35 can be controlled by adjusting the electric field intensity of the phase-shifting electric field to change the dielectric constant of the liquid crystal layer 35, thereby adjusting the phase of the electromagnetic wave transmitted therein, and further adjusting the phase of the electromagnetic wave transmitted by the microstrip unit 2 disposed on the side of the liquid crystal layer 35 close to the ground electrode plate 33. The present embodiment provides a radar antenna in which the phase adjustment unit 3 is a liquid crystal phase shifter, but in actual production, the type of the phase adjustment unit 3 is not limited thereto, and the liquid crystal layer 35 may be replaced with a material whose dielectric constant changes with voltage, such as a ferroelectric material, or the phase adjustment unit 3 may adopt a phase shifter having another structure.
In some embodiments, a routing layer 36 is disposed between the plurality of phased electrode plates 34 and the second substrate base plate 32, as shown in fig. 2. The wiring layer 36 includes a plurality of control circuits electrically connected to the plurality of phased electrode plates 34, respectively, to input corresponding control electric signals to the phased electrode plates 34. Specifically, the routing layer 36 may be made of ITO (indium tin oxide), which has the advantages of high transmittance and high conductivity, and can not only rapidly transmit the electrical signal for controlling the phased electrode plate 34, but also prevent the electromagnetic wave from being emitted.
In some embodiments, as shown in fig. 2, the phased electrode plate 34 includes a plurality of phased electrode strips 341, and any two adjacent phased electrode strips 341 are parallel to each other, that is, the phased electrode plate 34 is composed of a plurality of phased electrode strips 341 arranged at intervals, so as to improve the adjustment precision of the phase shifting electric field on the dielectric constant of the liquid crystal layer 35. In some embodiments, as shown in fig. 2, the phased electrode plates 34 are embedded in the liquid crystal layer 35, and thus the gap between any two adjacent phased electrode bars 341 is filled with a liquid crystal material.
In some embodiments, the phase of the electromagnetic wave is adjusted within a range of 0 to π/2 by the aforementioned phase-shifting electric field.
In some embodiments, the initial value of the phase adjusting element 3 may be set to a phase shift of π/4 to ensure that the electrical length of the feed of the radiating element 1 is equal to: 3 pi/4 +2k pi (where k is an integer), where the electrical length is the ratio of the physical length of the microstrip line to the wavelength of the electromagnetic wave transmitted by the microstrip line.
In some embodiments, as shown in fig. 1, the radiation unit 1 includes a radiation patch 11, the radiation patches 11 in the plurality of radiation units 1 are connected in series, and each two adjacent radiation units 1 are connected by a microstrip line 21. In some embodiments, as shown in fig. 1, the lengths of the radiation patches 11 are sequentially increased from the two end regions to the central region of the radar antenna, that is, an arrangement manner of the radiation patches 11 with a large middle and small two ends is formed, so as to concentrate the electromagnetic waves emitted by the radar antenna, improve the directivity of the emitted electromagnetic waves, and improve the gain of the radar antenna.
In some embodiments, the spacing of each adjacent two of the radiating patches 11 is equal to the medium wavelength of the electromagnetic wave. The medium wavelength refers to a wavelength of the electromagnetic wave when the electromagnetic wave is transmitted in the medium, and in this embodiment, the medium wavelength refers to a wavelength of the electromagnetic wave when the electromagnetic wave is transmitted in the radiation unit 1 and the microstrip unit 2.
In some embodiments, the radiating patch 11 is in a strip shape, and the width direction of the strip shape is parallel to the axial direction of the radiating element 1, in other words, the longer side of the strip-shaped radiating patch 11 is perpendicular to the microstrip line 21. The widths of the plurality of radiation patches 11 are equal to 0.5 times the medium wavelength of the electromagnetic wave. Specifically, the dielectric wavelength is a wavelength of the electromagnetic wave propagating in the dielectric, and in this embodiment, the dielectric wavelength is a wavelength of the electromagnetic wave propagating in the radiation patch 11, and the specific length thereof should be determined according to the type of the material of the radiation patch 11.
In some embodiments, as shown in fig. 3, the radar antenna further includes a signal line 4, the signal line 4 being configured to be electrically connected to an output terminal of a signal source (not shown); the input ends of the plurality of microstrip lines 21 are each electrically connected to the signal line 4, that is, the plurality of radiation units 1 are connected in parallel. Under the condition that a plurality of radiation units 1 are connected in parallel, the minimum adjustment range of the phase-shifting electric field to the phase of the electromagnetic wave is 0-pi/2, and the maximum adjustment range is 2 pi.
In some embodiments, as shown in fig. 3, the radiation unit 1 includes radiation patches 11, the radiation patches 11 of the multiple radiation units 1 are arranged at intervals along the direction of the signal line 4, the distance between two adjacent radiation patches 11 is equal to 0.5-0.8 times of the free space wavelength of the electromagnetic wave, and the gain of the radar antenna is set to be larger under the condition that the multiple radiation units 11 are connected in series. Specifically, the free space wavelength is a wavelength at which an electromagnetic wave propagates in a vacuum. In some embodiments, as shown in fig. 3, the lengths of the radiation patches 11 are sequentially increased from the two end regions to the central region of the radar antenna, that is, an arrangement manner of the radiation patches 11 with a large middle and small two ends is formed, so as to concentrate the electromagnetic waves emitted by the radar antenna, improve the directivity of the emitted electromagnetic waves, and improve the gain of the radar antenna.
In some embodiments, the radiation unit 1 connected in parallel is not limited to the radiation patch 11, and the radiation unit 1 may further include a plurality of radiation patches connected in series, that is, a plurality of groups of radiation patches connected in series can be connected in parallel on the signal line 4, so as to form a planar array of radiation patches to improve the radiation intensity of the electromagnetic wave.
The radar antenna provided by the embodiment is provided with the phase adjusting unit connected with the microstrip unit, so that the phase of the electromagnetic wave transmitted in the microstrip unit can be adjusted, and the phase of the emitted electromagnetic wave can be adjusted; and because the electromagnetic wave launched by the radar antenna can take place the resonance when appointed phase place (for example:pi/4), the radiation intensity of the electromagnetic wave launched under this state can reach the maximum value, therefore the utility model provides a radar antenna can also be with the phase place regulation of the electromagnetic wave launched to appointed value to make the gain of radar antenna reach the maximum, thereby improve the detection accuracy who uses its radar equipment; meanwhile, the phase of the electromagnetic wave offset due to the low machining precision of the radar antenna can be improved, so that when the manufacturing uniformity and the machining precision of the radiation unit and the microstrip unit do not meet the requirements, the radiation unit and the microstrip unit do not need to be manufactured again, and the manufacturing cost is saved.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A radar antenna, comprising:
a plurality of radiation units for emitting electromagnetic waves;
the microstrip unit is respectively connected with the plurality of radiation units and the signal source and is used for transmitting the electromagnetic waves provided by the signal source to each radiation unit; and
and the phase adjusting unit is connected with the microstrip unit and is used for adjusting the phase of the electromagnetic wave transmitted by the microstrip unit.
2. The radar antenna according to claim 1, wherein the microstrip unit includes a plurality of microstrip lines, output ends of the plurality of microstrip lines are electrically connected to signal input ends of the plurality of radiation units in a one-to-one correspondence, and input ends of the plurality of microstrip lines are electrically connected to an output end of the signal source.
3. The radar antenna according to claim 2, wherein the phase adjustment unit includes a first substrate, a second substrate, a liquid crystal layer, a ground electrode plate, and a plurality of phase control electrode plates; wherein the content of the first and second substances,
the first substrate base plate and the second substrate base plate are oppositely arranged, and the liquid crystal layer is arranged between the first substrate base plate and the second substrate base plate;
the microstrip lines are all arranged on one side, close to the liquid crystal layer, of the first substrate base plate;
the plurality of phase control electrode plates are arranged on one side, close to the liquid crystal layer, of the second substrate base plate, and the plurality of phase control electrode plates and the plurality of microstrip lines are arranged in a one-to-one correspondence mode; the grounding electrode plate is arranged on one side of the first substrate base plate far away from the liquid crystal layer; the phase control electrode plate and the grounding electrode plate are used for forming a phase-shifting electric field used for controlling the arrangement direction of liquid crystal molecules in the liquid crystal layer between the phase control electrode plate and the grounding electrode plate.
4. The radar antenna of claim 3, wherein the phased electrode plate includes a plurality of phased electrode strips, and any two adjacent phased electrode strips are parallel to each other.
5. The radar antenna of claim 3, wherein the phase-shifting electric field adjusts the phase of the electromagnetic wave in a range of 0 to pi/2.
6. The radar antenna according to any one of claims 2 to 5, wherein the radiation elements comprise radiation patches, the radiation patches of the plurality of radiation elements are connected in series, and each two adjacent radiation elements are connected by one microstrip line.
7. The radar antenna of claim 6, wherein a pitch of each adjacent two of the radiating patches is equal to a medium wavelength of the electromagnetic wave.
8. The radar antenna of claim 7, wherein the radiating patch has a strip shape, and a width direction thereof is parallel to an axial direction of the radiating element;
the widths of the radiation patches in the plurality of radiation units are each equal to 0.5 times the medium wavelength of the electromagnetic wave.
9. Radar antenna according to any one of claims 2 to 5, further comprising a signal line for electrical connection with an output of the signal source;
the input ends of the microstrip lines are electrically connected with the signal lines.
10. The radar antenna according to claim 9, wherein the radiation elements include radiation patches, the radiation patches of the plurality of radiation elements are arranged at intervals along the signal line direction, and a distance between each two adjacent radiation patches is equal to 0.5-0.8 times of a free space wavelength of the electromagnetic wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120577977.5U CN214898876U (en) | 2021-03-22 | 2021-03-22 | Radar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120577977.5U CN214898876U (en) | 2021-03-22 | 2021-03-22 | Radar antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214898876U true CN214898876U (en) | 2021-11-26 |
Family
ID=79037605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120577977.5U Active CN214898876U (en) | 2021-03-22 | 2021-03-22 | Radar antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214898876U (en) |
-
2021
- 2021-03-22 CN CN202120577977.5U patent/CN214898876U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3507858B1 (en) | Multi-layered software defined antenna | |
| US11119364B2 (en) | Liquid crystal phase shifter, method for operating the same, liquid crystal antenna, and communication apparatus | |
| US20220393356A1 (en) | Patch antenna | |
| WO2018028323A1 (en) | Antenna system | |
| KR102405672B1 (en) | Variable phase shifter comprising defected ground structure and radio frequency communication module comprising the same | |
| US8736514B2 (en) | Antenna | |
| WO2020259281A1 (en) | Antenna module, electronic apparatus, and antenna band adjustment method for electronic apparatus | |
| GB2520920A (en) | Beam scanning antenna | |
| CN115428260A (en) | Array antenna module, preparation method thereof and phased array antenna system | |
| CN113497354A (en) | Antenna array, antenna system and radar | |
| CN214898876U (en) | Radar antenna | |
| US10297926B2 (en) | Radar transceiver assemblies with transceiver chips on opposing sides of the substrate | |
| CN112864625A (en) | Radar antenna | |
| US9979066B2 (en) | Feed line comprised of a triplate line coupled between a waveguide/triplate line converter and patch antennas for optimizing signals through the feed line | |
| Tuan et al. | Bandwidth extension of planar microstrip-to-waveguide transition by via-hole locations at both sides of microstrip line | |
| US11799179B2 (en) | Liquid crystal phase shifter, method for operating the same, liquid crystal antenna, and communication apparatus | |
| CN215816423U (en) | Antenna array, antenna system and radar | |
| CN113871859B (en) | Dual magnetic moment antenna | |
| CN217009563U (en) | Leaky-wave antenna and electronic device | |
| TWI752780B (en) | Antenna structure with wide beamwidth | |
| CN116581536B (en) | Antenna and electronic equipment | |
| CN220731794U (en) | Microstrip patch antenna and electronic equipment | |
| JP7315043B2 (en) | patch antenna | |
| US20240006762A1 (en) | Liquid Crystal Phase Shifter, Method for Operating the Same, Liquid Crystal Antenna, and Communication Apparatus | |
| Li et al. | A frequency and pattern reconfigurable leaky wave antenna based on HMCSIW and liquid crystal technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |