CN115360501A - Wide beam antenna for 77GHz automobile radar - Google Patents
Wide beam antenna for 77GHz automobile radar Download PDFInfo
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- CN115360501A CN115360501A CN202210956346.3A CN202210956346A CN115360501A CN 115360501 A CN115360501 A CN 115360501A CN 202210956346 A CN202210956346 A CN 202210956346A CN 115360501 A CN115360501 A CN 115360501A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
- H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
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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
- H01Q1/50—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
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention belongs to the technical field of radar antennas, and particularly relates to a wide-beam antenna for a 77GHz automobile radar, which comprises an antenna substrate, a wide-beam antenna and a wide-beam antenna, wherein the antenna substrate is used as a medium for antenna propagation signals; the main radiation array antenna unit is arranged on the antenna substrate and used for transmitting antenna signals; and the microstrip resonance patch units are respectively arranged on two sides of the main radiation array antenna unit in a spacing mode and are used for widening the width of a wave beam, improving the large-angle gain of the antenna and reducing the loss of the antenna. The invention provides a wide beam antenna for a 77GHz automobile radar, which realizes signal transmission by combining a main radiation array antenna unit and a micro-strip resonance patch unit, not only can effectively widen the width of a beam, but also can effectively improve the large-angle gain of the antenna and reduce the loss of the antenna; when the antenna is applied to a 77GHz automobile radar, the 77GHz automobile radar has the characteristics of wide beam, high gain, high detection precision and the like.
Description
Technical Field
The invention belongs to the technical field of radar antennas, and particularly relates to a wide beam antenna for a 77GHz automobile radar.
Background
Automotive radars are radars for automobiles or other ground-based motor vehicles. Based on different technologies, the system can be divided into a laser radar, an ultrasonic radar, a millimeter wave radar, a microwave radar and the like, and has the functions of finding obstacles, predicting collision, self-adaptive cruise control and the like.
The wavelength of the millimeter wave radar is between the centimeter and the light wave, so that the millimeter wave radar has the advantages of microwave guidance and photoelectric guidance, has strong capability of penetrating fog, smoke and dust, and has good performance under all-weather conditions of rainstorm, night and dense fog compared with an image sensor, an ultrasonic radar, a laser radar and the like. Compared with a 24GHz automobile millimeter wave radar sensor, the 77GHz automobile millimeter wave radar sensor has the advantages of high measurement precision, high resolution and small size. However, in the application scenarios of a 77GHz automobile angle radar, such as Lane Change Assist (LCA), blind Spot Detection (BSD), lane Departure Warning (LDW), the beam width is relatively narrow and the large-angle detection distance is insufficient, so that the detection distance accuracy is affected and danger is brought to automobile driving.
The antenna is a main part for signal detection in the millimeter wave radar, so that the antenna capable of effectively widening wave beams and improving large-angle gain is designed, and the antenna has great significance for the detection accuracy of the 77GHz automobile radar.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a wide-beam antenna for a 77GHz automobile radar, which realizes signal transmission by combining a main radiation array antenna unit and a micro-strip resonance patch unit, not only can effectively widen the width of a beam, but also can effectively improve the large-angle gain of the antenna and reduce the loss of the antenna; when the antenna is applied to a 77GHz automobile radar, the 77GHz automobile radar has the characteristics of wide beam, high gain, high detection precision and the like.
The technical effect to be achieved by the invention is realized by the following technical scheme:
the invention relates to a wide beam antenna for a 77GHz automobile radar, which comprises an antenna substrate, a signal transmitting antenna and a signal receiving antenna, wherein the antenna substrate is used as a medium for transmitting signals; the main radiation array antenna unit is arranged on the antenna substrate and used for transmitting antenna signals; and the microstrip resonance patch units are respectively arranged on two sides of the main radiation array antenna unit in a spacing arrangement mode and are used for widening the width of a wave beam, improving the large-angle gain of the antenna and reducing the loss of the antenna.
According to the wide-beam antenna for the 77GHz automobile radar, the width of a beam is widened and the large-angle gain of the antenna is improved through the micro-strip resonance patch unit, so that the main radiation array antenna unit and the micro-strip resonance patch unit are combined to transmit signals, the width of the antenna beam can be effectively widened, the large-angle gain of the antenna can be effectively improved, and the loss of the antenna can be reduced; when the antenna is applied to a 77GHz automobile radar, the 77GHz automobile radar can also have the characteristics of wide beam, high gain, high detection precision and the like.
As one preferred scheme, the main radiating array antenna unit is a microstrip series-fed array antenna unit, the microstrip structure loss becomes larger along with the increase of the frequency in a 77GHz millimeter wave band, and in order to realize high gain of the antenna, an array needs to be formed at this time, and comprehensively, compared with parallel feeding, selecting a series-fed structure can effectively shorten the length of a feeder line, improve the efficiency of the antenna, and reduce the insertion loss; preferably, the main radiation array antenna unit comprises a microstrip patch set, an antenna feed line connected between the microstrip patch set, an impedance transformer connected to one end of the antenna feed line, and an antenna port connected to the impedance transformer.
As a preferred scheme, the microstrip patch group comprises 8 microstrip patches, and the width of each microstrip patch is gradually reduced from the middle to two sides, so that the requirement of narrower wave beam in the pitching plane can be met, and the low sidelobe level in the pitching plane can be obtained, thereby accurately detecting the target and improving the overall detection precision of the antenna; considering the antenna symmetry and redundancy, the side lobe level setting is preferably-25 dB, and the amplitude coefficient is determined by a Chebyshev array synthesis method.
As a preferred scheme, the width ratio from left to right of the microstrip patch is 0.378: 0.378, the left side and the right side of the microstrip patch group are designed symmetrically, and the theoretical design requirement of the pitching surface of the antenna is met; preferably, the width of the 8 microstrip patches from left to right is 0.378mm, 0.58mm, 0.84mm, 1mm, 0.84mm, 0.58mm and 0.378mm in sequence.
As a preferable scheme, the current ratio of the microstrip patch from the middle to the left is I1: I2: I3: I4= 1.
As a preferred scheme, the microstrip resonant patch unit includes a first microstrip resonant patch group disposed on one side of the main radiating array antenna unit, and a second microstrip resonant patch group disposed on the other side of the main radiating array antenna unit.
As a preferred scheme, the first microstrip resonance patch group and the second microstrip resonance patch group both include 8 microstrip resonance patches, and the widths of the microstrip resonance patches are arranged in one-to-one correspondence with the microstrip patches; the requirements of easy integration, small size and wide detection plane beam of the antenna can be further met.
As a preferable scheme, the distance between the microstrip resonance patch and the corresponding microstrip patch is 0.6mm-1mm; the microstrip resonance patch has larger influence on an antenna directional diagram, so other parameters are fixed, the distance between the microstrip resonance patch unit and the main radiation array antenna unit is changed, and the antenna directional diagram can be effectively adjusted. When the microstrip resonance patch is close to the main radiation array antenna unit, the antenna azimuth plane directional pattern wave beam is widened, so that the amplitude is increased by 1-2dB under the same angle, the link gain is improved by about 3dB, and the detection distance is increased by about 20m under the same angle; and when the microstrip resonance patch is far away from the main radiation unit, the wave beam of the antenna azimuth plane directional pattern is gradually narrowed.
As one preferable scheme, grounding holes are formed in the microstrip resonance patches and used for grounding of the antenna.
Preferably, the antenna substrate is Rogers RO3003, the thickness is 0.127mm, the substrate dielectric constant is 3.1, and the loss tangent is 0.0013, so as to further meet the requirements of low loss and low cost of the antenna.
In summary, the invention has at least the following advantages:
according to the wide-beam antenna for the 77GHz automobile radar, the main radiation array antenna unit and the micro-strip resonance patch unit are combined to realize signal transmission, so that the width of a beam can be effectively widened, the large-angle gain of the antenna can be effectively improved, and the loss of the antenna can be reduced; when the antenna is applied to a 77GHz automobile radar, the 77GHz automobile radar has the characteristics of wide beam, high gain, high detection precision and the like.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a wide beam antenna for a 77GHz automobile radar in an embodiment of the invention;
fig. 2 is a schematic structural diagram of a main radiation array antenna unit in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a microstrip patch group, a first microstrip resonance patch group, and a second microstrip resonance patch group according to an embodiment of the present invention;
FIG. 4 is a diagram comparing an antenna azimuth plane with an original antenna azimuth plane in an embodiment of the present invention;
FIG. 5 is a graph comparing standing waves at an antenna port to the original standing waves at an antenna port in an embodiment of the present invention;
figure 6 is an azimuthal plane pattern comparison of microstrip patches to microstrip resonant patches at different distances in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. The described embodiments are a few embodiments of the invention, rather than all embodiments.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Example 1:
referring to fig. 1, the wide beam antenna for a 77GHz automotive radar in this embodiment includes an antenna substrate 100, a main radiation array antenna unit 200 disposed on the antenna substrate 100, and microstrip resonant patch units 300 respectively disposed on two sides of the main radiation array antenna unit 200 in a spaced manner; the antenna substrate 100 serves as a medium for antenna propagation signals, and the main radiating array antenna unit 200 serves as transmission of antenna signals; the microstrip resonant patch unit 300 is used to widen the width of a beam, improve the wide-angle gain of the antenna, and reduce the loss of the antenna.
Preferably, the antenna substrate 100 is a rogowski RO3003 with a thickness of 0.127mm, a substrate dielectric constant of 3.1 and a loss tangent of 0.0013, so as to further meet the requirements of low loss and low cost of the antenna. The main radiation array antenna unit 200 is a microstrip series feed array antenna unit, the microstrip structure loss becomes larger along with the increase of the frequency in the 77GHz millimeter wave band, and in order to realize the high gain of the antenna, the array needs to be formed at this time, and comprehensively, compared with parallel feed, the selection of the series feed structure can effectively shorten the length of a feed line, improve the efficiency of the antenna and reduce the insertion loss; referring further to fig. 2, main radiating array antenna element 200 includes microstrip patch sets 210, antenna feed lines 220 connected between microstrip patch sets 210, impedance transformers 230 connected to one end of antenna feed lines 220, and antenna ports 240 connected to impedance transformers 230.
The automobile angle radar mainly uses a plane with a wider horizontal beam for detection, and although the microstrip series-fed array antenna unit can ensure that the horizontal plane of the angle radar has a wider fan-shaped directional diagram, the radar antenna formed by the microstrip series-fed array antenna unit still has the problem of insufficient large-angle gain, and the width of the beam needs to be further expanded; meanwhile, in consideration of the simplicity of processing, the microstrip resonant patch unit 300 is used to widen the beam width in this embodiment, and the current of the microstrip resonant patch unit 300 is opposite to the current of the main radiation array antenna unit 200, so that the main radiation gain is relatively low, and at other angles, the microstrip resonant patch unit 300 and the main radiation array antenna unit 200 are mutually overlapped to increase the gain at each angle, thereby achieving the purpose of widening the beam width.
Example 2:
referring to fig. 1, the wide beam antenna for a 77GHz automotive radar in this embodiment is the same as that in embodiment 1, and includes an antenna substrate 100, a main radiation array antenna unit 200 disposed on the antenna substrate 100, and microstrip resonant patch units 300 respectively disposed on two sides of the main radiation array antenna unit 200 in a spaced manner; the main difference is that the main radiating array antenna unit 200 is further designed based on embodiment 1, and the design is as follows:
referring to fig. 2, the microstrip patch group 210 includes 8 microstrip patches, and the width of the microstrip patches is gradually decreased from the middle to both sides, so as to meet the requirement of narrower beam in the pitching plane, and obtain a low sidelobe level in the pitching plane, thereby accurately detecting a target and improving the overall detection accuracy of the antenna; and considering the antenna symmetry and redundancy, the secondary lobe level setting is preferably-25 dB, and the amplitude coefficient is determined by adopting a Chebyshev array synthesis method. Specifically, the microstrip patch group 210 includes a first microstrip patch 201, a second microstrip patch 202, a third microstrip patch 203, a fourth microstrip patch 204, a fifth microstrip patch 205, a sixth microstrip patch 206, a seventh microstrip patch 207 and an eighth microstrip patch 208, which are sequentially arranged from left to right, as shown in fig. 3; and the width ratio of the 8 microstrip patches from left to right is 0.378: 0.378, the left side and the right side are designed symmetrically, preferably, the widths of the 8 microstrip patches from left to right are 0.378mm, 0.58mm, 0.84mm, 1mm, 0.84mm, 0.58mm and 0.378mm in sequence, and the current ratio of the 8 microstrip patches from the middle to the left is I1: I2: I3: I4= 1.
Example 3:
referring to fig. 1, the wide beam antenna for a 77GHz automotive radar in this embodiment is the same as that in embodiment 1 or 2, and includes an antenna substrate 100, a main radiation array antenna unit 200 disposed on the antenna substrate 100, and microstrip resonant patch units 300 respectively disposed on two sides of the main radiation array antenna unit 200 in a spaced manner; the main difference is that the microstrip resonant patch unit 300 is further designed based on embodiment 1 or 2, and the design is as follows:
the microstrip resonant patch unit 300 includes a first microstrip resonant patch group 310 disposed on one side of the main radiating array antenna unit 200, and a second microstrip resonant patch group 320 disposed on the other side of the main radiating array antenna unit 200. Preferably, the first microstrip resonance patch group 310 and the second microstrip resonance patch group 320 both include 8 microstrip resonance patches, and the width of each microstrip resonance patch is set in one-to-one correspondence with the width of each 8 microstrip patches, and a grounding hole for grounding is provided on each microstrip resonance patch, so that the requirements of easy integration, small size and wide detection plane beam of the antenna can be effectively met. Referring to fig. 3, the first microstrip resonance patch set 310 and the second microstrip resonance patch set 320 both include a first microstrip resonance patch 301 having a same width as the first microstrip patch 201 and disposed correspondingly, a second microstrip resonance patch 302 having a same width as the second microstrip patch 202 and disposed correspondingly, a third microstrip resonance patch 303 having a same width as the third microstrip patch 203 and disposed correspondingly, a fourth microstrip resonance patch 304 having a same width as the fourth microstrip patch 204 and disposed correspondingly, a fifth microstrip resonance patch 305 having a same width as the fifth microstrip patch 205 and disposed correspondingly, a sixth microstrip resonance patch 306 having a same width as the sixth microstrip patch 206 and disposed correspondingly, a seventh microstrip resonance patch 307 having a same width as the seventh microstrip patch 207 and disposed correspondingly, and an eighth microstrip resonance patch 308 having a same width as the eighth microstrip patch 208 and disposed correspondingly.
Comparing the antenna azimuth plane in this embodiment with the original antenna azimuth plane, as shown in fig. 4, the transmit-receive gain of the antenna in this embodiment is improved by about 3dB, and therefore, the detection distance of the antenna can be improved by about 20 m. Meanwhile, comparing the standing wave of the antenna port in the embodiment with the standing wave of the original antenna, as shown in fig. 5, the directional diagram of the antenna in the embodiment is substantially consistent with the directional diagram of the original antenna, and has a bandwidth of 3GHz when being lower than-10 dB, and has a wider bandwidth.
Further, the distance between the microstrip resonance patch and the corresponding microstrip patch is 0.6mm-1mm; the microstrip resonance patch has larger influence on an antenna directional pattern, so other parameters are fixed, the distance between the microstrip resonance patch unit and the main radiation array antenna unit is changed, and the antenna directional pattern can be effectively adjusted. As shown in fig. 6, when the microstrip resonant patch is close to the microstrip patch, the antenna azimuth plane directional pattern beam is widened, which results in a 1-2dB higher amplitude at the same angle, the link gain is increased by about 3dB, and the detection distance is increased by about 20m at the same angle; and when the microstrip resonance patch is far away from the main radiation unit, the antenna azimuth plane directional pattern wave beam is gradually narrowed, and amplitude value dip near 0 degrees exists. Therefore, the performance is best when the distance between the microstrip resonance patch and the corresponding microstrip patch is 0.95 mm.
The wide beam antenna for the 77GHz automobile radar in the embodiment widens the width of a beam and improves the large angle gain of the antenna through the microstrip resonance patch unit, so that the main radiation array antenna unit and the microstrip resonance patch unit are combined to transmit signals, the width of the antenna beam can be effectively widened, the large angle gain of the antenna can be effectively improved, and the loss of the antenna can be reduced.
Example 4:
the 77GHz automotive radar in the embodiment comprises a radar body and the wide-beam antenna which is arranged on the radar body and is as described in any one of embodiments 1-3; on the basis of the design invariance of the radar body, in view of the wide-beam and large-angle high-gain design of the antenna in the embodiments 1 to 3, the 77GHz automobile radar in the embodiment also has the characteristics of wide-beam, high-gain, high detection precision and the like.
According to the technical scheme of the embodiment, the wide-beam antenna for the 77GHz automobile radar is provided, the transmission of signals is realized by combining the main radiation array antenna unit and the micro-strip resonance patch unit, the width of a beam can be effectively widened, the large-angle gain of the antenna can be effectively improved, and the loss of the antenna can be reduced; when the antenna is applied to a 77GHz automobile radar, the 77GHz automobile radar has the characteristics of wide beam, high gain, high detection precision and the like.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature being below, beneath or beneath a second feature includes the first feature being directly below and obliquely below the second feature or simply indicating that the first feature is at a lesser level than the second feature.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.
Claims (10)
1. A wide beam antenna for a 77GHz automotive radar, comprising:
an antenna substrate serving as a medium for an antenna to propagate a signal;
the main radiation array antenna unit is arranged on the antenna substrate and used for transmitting antenna signals;
and the microstrip resonance patch units are respectively arranged on two sides of the main radiation array antenna unit in a spacing mode and are used for widening the width of a wave beam, improving the large-angle gain of the antenna and reducing the loss of the antenna.
2. The wide beam antenna for a 77GHz automotive radar according to claim 1 wherein the main radiating array antenna unit is a microstrip series fed array antenna unit comprising microstrip patch sets, an antenna feed line connected between the microstrip patch sets, an impedance transformer connected to one end of the antenna feed line, and an antenna port connected to the impedance transformer.
3. The wide beam antenna for a 77GHz automotive radar according to claim 2, characterized in that the microstrip patch group comprises 8 microstrip patches, and the width of the microstrip patches is gradually reduced from the middle to two sides; the side lobe level is set to-25 dB, and the amplitude coefficient is determined by a Chebyshev array synthesis method.
4. The wide beam antenna for a 77GHz automotive radar according to claim 3, wherein the ratio of the width of the microstrip patch from left to right is 0.378: 0.378.
5. the wide beam antenna for a 77GHz automotive radar according to claim 3, characterized in that the ratio of currents of the microstrip patch from the middle to the left is I1: I2: I3: I4= 1.
6. The wide beam antenna for a 77GHz automotive radar of claim 1, wherein the microstrip resonant patch unit comprises a first microstrip resonant patch group disposed on one side of the main radiating array antenna unit and a second microstrip resonant patch group disposed on the other side of the main radiating array antenna unit.
7. The wide beam antenna for the 77GHz automotive radar, according to claim 6, wherein the first and second microstrip resonance patch groups each comprise 8 microstrip resonance patches, and widths of the microstrip resonance patches are arranged in one-to-one correspondence with the microstrip patches.
8. The wide beam antenna for a 77GHz automotive radar according to claim 7, characterized in that the distance between the microstrip resonant patch and the corresponding microstrip patch is 0.6mm-1mm.
9. The wide beam antenna for the 77GHz automotive radar according to claim 7, wherein the microstrip resonant patches are all provided with grounding holes.
10. The wide beam antenna for a 77GHz automotive radar according to claim 1, wherein the antenna substrate is rogue RO3003, having a thickness of 0.127mm, a substrate dielectric constant of 3.1, and a loss tangent of 0.0013.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210956346.3A CN115360501A (en) | 2022-08-10 | 2022-08-10 | Wide beam antenna for 77GHz automobile radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210956346.3A CN115360501A (en) | 2022-08-10 | 2022-08-10 | Wide beam antenna for 77GHz automobile radar |
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| Publication Number | Publication Date |
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| CN115360501A true CN115360501A (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210956346.3A Pending CN115360501A (en) | 2022-08-10 | 2022-08-10 | Wide beam antenna for 77GHz automobile radar |
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| CN (1) | CN115360501A (en) |
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- 2022-08-10 CN CN202210956346.3A patent/CN115360501A/en active Pending
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