CN220934397U - Wide-beam millimeter wave antenna and radar equipment - Google Patents
Wide-beam millimeter wave antenna and radar equipment Download PDFInfo
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- CN220934397U CN220934397U CN202323051866.9U CN202323051866U CN220934397U CN 220934397 U CN220934397 U CN 220934397U CN 202323051866 U CN202323051866 U CN 202323051866U CN 220934397 U CN220934397 U CN 220934397U
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Abstract
The utility model discloses a wide-beam millimeter wave antenna and radar equipment, comprising: a metal patch layer, a first dielectric substrate, an antenna feed layer, a second dielectric substrate and a metal dielectric layer which are sequentially laminated; the metal patch layer comprises at least two metal patch units, and the metal patch units are arranged on the first dielectric substrate; the antenna feed layer comprises a main radiation antenna array which is arranged on the second dielectric substrate; the orthographic projection of the metal patch unit in the thickness direction of the second dielectric substrate is at least partially positioned outside the orthographic projection of the main radiation antenna array on the second dielectric substrate, and the two metal patch units are arranged at two sides of the main radiation antenna array at intervals. The utility model adopts a laminated structure, distributes the main radiation antenna array and the metal patch units on different medium substrates, and excites the metal patch units in a coupling mode so as to realize the expansion of the beam width of the millimeter wave antenna, thereby having the characteristics of wide beam, small volume, easy integration and the like.
Description
Technical Field
The utility model relates to the technical field of antennas, in particular to a wide-beam millimeter wave antenna and radar equipment.
Background
Millimeter wave radar is a radar technology that performs radio wave detection using the millimeter wave band. Millimeter waves refer to radio waves having frequencies between 30GHz and 300 GHz. The millimeter wave radar has the characteristics of wide frequency band, short wavelength, narrow beam, light weight, strong resolution, strong penetrability and the like. Compared with microwaves, the millimeter wave radar has high resolution and light and small structure; compared with infrared and visible light, the millimeter wave radar has stronger penetrability and smaller influence by weather, can ensure the normal detection of the radar in severe environments such as rain, snow, storm, smoke and the like, and has the characteristic of all-weather full-time operation. With the continuous development of technology, the application range and performance of millimeter wave radar technology are further improved, smaller targets can be detected and identified, and the millimeter wave radar technology can be applied to the fields of unmanned aerial vehicles, robots, intelligent home furnishings and the like.
The mainstream millimeter wave radar products in the existing market mostly adopt microstrip patch antenna printing to form array antenna on high frequency PCB (Printed Circuit Board ) board to realize antenna requirement. The patch antenna has the advantages of small volume, light weight, low profile, simple manufacture, low cost, easy integration, easy realization of dual-frequency and multi-band operation, and the like. The string patch antenna and the comb patch antenna are generally adopted for a plurality of purposes, the patch antenna array elements are simple in design, and the consistency among the plurality of antenna array elements is easier to design, so that a plurality of products adopt the string patch antenna and the comb patch antenna as millimeter wave radar antenna schemes.
In many different application scenarios, millimeter wave radar needs to meet a wider beam width in antenna design in order to achieve a larger FOV (field of view). For example, the need for antennas in vehicular millimeter wave angle radar applications requires that antennas still have significant gain at ±75° or at larger angles, but the design of a single antenna with a wide beam pattern cannot be accomplished due to the limitations of the patch antenna itself. Therefore, how to increase the beam width as much as possible is an important issue to be solved.
Disclosure of utility model
In order to overcome the defects in the prior art, the utility model aims to provide a wide-beam millimeter wave antenna and radar equipment so as to solve the problems in the prior art.
The utility model adopts the following technical scheme:
according to an aspect of the present utility model, there is provided a wide-beam millimeter wave antenna comprising:
A metal patch layer, a first dielectric substrate, an antenna feed layer, a second dielectric substrate and a metal dielectric layer which are sequentially laminated;
The metal patch layer comprises at least two metal patch units, and the metal patch units are arranged on the first dielectric substrate;
The antenna feed layer comprises a main radiation antenna array, and the main radiation antenna array is arranged on the second dielectric substrate;
And in the thickness direction of the second dielectric substrate, the orthographic projection of the metal patch unit on the second dielectric substrate is at least partially positioned outside the orthographic projection of the main radiation antenna array on the second dielectric substrate, and the two metal patch units are arranged at two sides of the main radiation antenna array at intervals.
Further, the projection of each metal patch unit on the second dielectric substrate in the plate thickness direction is equal to the distance between the main radiation antenna array.
Further, the first dielectric substrate and the second dielectric substrate are provided with a first direction and a second direction which are arranged in the same direction, and the first direction and the second direction are intersected;
The projection of each metal patch unit on the second dielectric substrate in the plate thickness direction is overlapped with the main radiation antenna array, the width of the overlapped part is not more than 0.15 millimeter, and the width of the overlapped part is an extension length value in the second direction.
Further, the main radiating antenna array includes a plurality of antenna patch units, the antenna patch units are rectangular, the maximum dimension of the antenna patch units along the first direction is L1 mm, and the following is satisfied: l1< lambda 1/2, wherein lambda 1 is the wavelength of the electromagnetic wave propagating in the second dielectric substrate.
Further, the width of each antenna patch unit of the main radiating antenna array gradually decreases from the middle to the two sides along the first direction, and the width of each antenna patch unit is an extension length value in the second direction.
Further, the metal patch unit is rectangular, a maximum dimension of the metal patch unit along the first direction is L2 mm, and the metal patch unit satisfies: l2< lambda 2/2, where lambda 2 is the wavelength of the electromagnetic wave propagating in the first dielectric substrate.
Further, the antenna feed layer further includes: microstrip line, impedance matching structure and feeder line structure;
The microstrip line, the impedance matching structure and the feeder line structure are uniformly distributed on the second dielectric substrate;
one end of the microstrip line is connected with ports of an external chip transmitter and an external chip receiver, and the other end of the microstrip line is connected with one end of the impedance matching structure;
The other end of the impedance matching structure is connected with one end of the feeder line structure, and the other end of the feeder line structure is connected with the main radiation antenna array;
And each antenna patch unit of the main radiation antenna array is connected through the feeder line structure.
Further, the plurality of metal patch units are arranged on two sides of the axis of the first dielectric substrate along the first direction;
the main radiation antenna array is arranged on the axis of the second dielectric substrate along the first direction.
Further, the first dielectric substrate and the second dielectric substrate are both high-frequency plates.
According to another aspect of the present utility model, there is also provided a radar apparatus including the wide-beam millimeter wave antenna according to any one of the embodiments of the present utility model.
According to the wide-beam millimeter wave antenna and the radar equipment provided by the utility model, the laminated structure is adopted, the main radiation antenna array and the metal patch units are distributed on different dielectric substrates, and in the thickness direction of the second dielectric substrate, the orthographic projection of the metal patch units on the second dielectric substrate is at least partially positioned outside the orthographic projection of the main radiation antenna array on the second dielectric substrate, so that the metal patch units are arranged in a staggered manner with the main radiation antenna array in the thickness direction, the metal patch units are arranged at two sides of the main radiation antenna array at intervals, and the radiation antenna array excites the metal patch units in a coupling mode so as to realize the expansion of the beam width of the millimeter wave antenna, and the wide-beam millimeter wave antenna has the characteristics of small size, easiness in integration and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a stacked structure of a wide-beam millimeter wave antenna according to an embodiment of the present utility model;
fig. 2 is a schematic layout diagram of an antenna feeding layer according to an embodiment of the present utility model;
fig. 3 is a schematic layout diagram of a metal patch layer according to an embodiment of the present utility model;
Fig. 4 is a schematic diagram of a relative position of an antenna patch of a metal patch layer and a metal patch unit of an antenna feed layer according to an embodiment of the present utility model;
FIG. 5 is a simulation diagram of parameters of the reflection coefficient of the antenna according to the embodiment of the present utility model;
Fig. 6 is a simulation diagram of an EH pattern of an antenna according to an embodiment of the present utility model.
Reference numerals:
1. A metal dielectric layer; 2. a second dielectric substrate; 3. an antenna feed layer; 4. a first dielectric substrate; 5. a metal patch layer; 6. a microstrip line; 7. an impedance matching structure; 8. a feeder structure; 9. an antenna patch unit; 10. and a metal patch unit.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. 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 fall within the scope of the utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the following description, sequential words such as "first," "second," "third," and "fourth" for element distinction are used merely to facilitate explanation of the utility model and are not themselves of particular significance or order.
Millimeter wave radar technology can be applied in a variety of fields including security detection, human detection, automobile driving assistance, and the like. Millimeter wave radar systems are typically composed of antennas, transmitters, receivers, processors, and the like. The transmitter generates a beam of millimeter wave signals and then transmits the signals to the target object. When the signal impinges on the target object, a portion of the signal is reflected back and received by the receiver. The receiver sends the received signals to the processor for processing, so that information of the distance, the speed, the direction and the like of the target object can be obtained.
The applicant finds that, for example, in the automotive driving assistance field, in the application of the vehicle millimeter wave angle radar, the antenna needs to have a larger gain at ±75° or larger angle, but the beam width of the patch antenna is limited due to the constraint relationship between the size and the working frequency of the patch antenna, so that the design of the single antenna with a wide beam pattern cannot be completed, which is not beneficial to practical application in many scenes. Therefore, the present embodiment proposes a wide-beam millimeter wave antenna and a radar apparatus to meet the requirement of transmitting signals in a wider direction.
Fig. 1 is a schematic diagram of a stacked structure of a wide-beam millimeter wave antenna according to an embodiment of the present utility model; fig. 2 is a schematic layout diagram of an antenna feeding layer according to an embodiment of the present utility model; fig. 3 is a schematic layout diagram of a metal patch layer according to an embodiment of the present utility model; fig. 4 is a schematic diagram of the relative positions of the antenna patch of the metal patch layer and the metal patch unit of the antenna feed layer according to an embodiment of the present utility model. Referring to fig. 1-4, the present utility model provides a wide beam millimeter wave antenna comprising:
A metal patch layer 5, a first dielectric substrate 4, an antenna feed layer 3, a second dielectric substrate 2 and a metal dielectric layer 1 which are sequentially laminated;
The metal patch layer 5 comprises at least two metal patch units 10, and the metal patch units 10 are arranged on the first dielectric substrate 4;
the antenna feed layer 3 comprises a main radiation antenna array which is arranged on the second dielectric substrate 2;
In the thickness direction of the second dielectric substrate 2, the orthographic projection of the metal patch unit 10 on the second dielectric substrate 2 is at least partially located outside the orthographic projection of the main radiation antenna array on the second dielectric substrate 2, and two metal patch units 10 are arranged at two sides of the main radiation antenna array at intervals.
The metal dielectric layer 1 is used as a metal ground, the material of the metal dielectric layer 1 is usually copper, and the metal dielectric layer 1 can be formed on one side of the second dielectric substrate 2 away from the first dielectric substrate 4 by using an electroless plating process.
An antenna feed layer 3 is printed on one side of the second dielectric substrate 2 opposite to the first dielectric substrate 4, and the antenna feed layer 3 is made of metal copper and is used for completing feed and radiation of a main radiation antenna array. When a current is passed through the main radiating antenna array, an electromagnetic field is generated therearound, thereby generating electromagnetic radiation.
The metal patch layer 5 is printed on one side of the first dielectric substrate 4, which is away from the second dielectric substrate 2, and the orthographic projection of the metal patch unit 10 of the metal patch layer 5 on the second dielectric substrate 2 is at least partially located outside the orthographic projection of the main radiation antenna array on the second dielectric substrate 2, so that the metal patch unit 10 is arranged in a dislocation manner with the main radiation antenna array in the plate thickness direction, and radiation is realized through the electromagnetic coupling effect of the main radiation antenna array.
Illustratively, the projection of each metal patch unit 10 onto the second dielectric substrate 2 in the plate thickness direction is equal to the distance of the main radiating antenna array.
Illustratively, the first dielectric substrate 4 and the second dielectric substrate 2 each have a first direction X and a second direction Y disposed in the same direction, the first direction X and the second direction Y intersecting;
The projection of each metal patch unit 10 on the second dielectric substrate 2 in the thickness direction overlaps the main radiating antenna array, and the width of the overlapping portion is not more than 0.15 mm, and the width of the overlapping portion is the extension length value in the second direction Y.
Wherein an XY coordinate system arranged in the same direction is set on the first dielectric substrate 4 and the second dielectric substrate 2, the first direction X and the second direction Y intersect, and preferably, the first direction X is perpendicular to the second direction Y.
Specifically, as shown in fig. 4, the projection of each metal patch unit 10 onto the second dielectric substrate 2 in the plate thickness direction is equal to the distance d of the main radiation antenna array. When the distance d is negative, it means that the projection of each metal patch unit 10 onto the second dielectric substrate 2 in the thickness direction overlaps the main radiating antenna array. In this embodiment, the width value of the overlapping portion in the second direction Y is not greater than 0.15 mm, and if the overlapping portion is greater than 0.15 mm, the problem of deterioration of the antenna pattern may be caused. The width value of the overlapping portion is 0.15 mm, the coupling effect of the metal patch unit 10 and the main radiating antenna array is optimal, but the coupling effect of the metal patch unit 10 is poor and the corresponding effect of expanding the bandwidth is also weakened as the width value of the overlapping portion is gradually reduced, namely the distance d value is increased. Therefore, the distance d is adjusted and selected according to the required operating frequency of the antenna and the degree of beam broadening, so that the distance d between the projection of the metal patch unit 10 on the second dielectric substrate 2 in the thickness direction and the main radiating antenna array is as small as possible when designing the antenna, so as to increase the antenna beam width.
Illustratively, the main radiating antenna array comprises a plurality of antenna patch units 9, the antenna patch units 9 are rectangular, the maximum dimension of the antenna patch units 9 along the first direction is L1 mm, and the following are satisfied: l1< lambda 1/2, where lambda 1 is the wavelength of the electromagnetic wave propagating in the second dielectric substrate 2.
Specifically, the main radiating antenna array is provided with 8 antenna patch units 9, and the lengths L1 of the 8 antenna patch units 9 along the first direction X are all slightly smaller than λ 1/2 theoretically, where λ 1 is the wavelength of electromagnetic waves propagating in the second dielectric substrate 2, and the calculation formula of λ 1 is as follows:
λ1＝λ0/εr
Wherein lambda 0 is the wavelength of electromagnetic wave propagating in the free space, epsilon r is the relative dielectric constant of the high-frequency plate material contained in the second dielectric substrate 2.
Illustratively, the width W1 of each antenna patch unit 9 of the main radiating antenna array gradually becomes smaller from the middle to both sides in the first direction X, and the width W1 of the antenna patch unit 9 is an extension length value in the second direction Y.
Specifically, in order to adjust the sidelobe level, according to chebyshev current distribution, the widths W1 of the 8 antenna patch units 9 are distributed in a trend that the middle is gradually reduced toward the two ends of the second dielectric substrate 2 in the first direction X, so that the radar antenna has a larger antenna caliber and the sidelobe level is lower.
Illustratively, the metal patch unit 10 is rectangular, the maximum dimension of the metal patch unit 10 in the first direction X is L2 millimeters, and satisfies: l2< lambda 2/2, where lambda 2 is the wavelength of the electromagnetic wave propagating in the first dielectric substrate 4.
Specifically, the metal patch layer 5 is provided with 16 metal patch units 10, and the 16 metal patch units 10 are divided into left and right 8 pieces each, and are symmetrically distributed along the axis line in the first direction X of the first dielectric substrate 4. The lengths L1 of the 16 antenna patch units 9 along the first direction X are theoretically slightly smaller than λ 2/2, where λ 2 is the wavelength of the electromagnetic wave propagating in the first dielectric substrate 4, and the calculation formula of λ 1 is as follows:
λ2＝λ0/εr
Wherein lambda 0 is the wavelength of electromagnetic wave propagating in the free space, epsilon r is the relative dielectric constant of the high-frequency plate material contained in the first dielectric substrate 4. The width W2 of each metal patch unit 10 is not specifically required, and the width W2 of each metal patch unit 10 may be equal or unequal, but the width W2 and the length L2 of each metal patch unit 10 comprehensively influence the resonance frequency of a single patch, and further influence the directional diagram of the main radiation antenna array of the antenna feed layer 3, that is, the width W2 and the length L2 comprehensively influence the beam widening effect and the pitching surface directional diagram of the whole antenna.
Illustratively, as shown in fig. 2, the antenna feed layer 3 further includes: a microstrip line 6, an impedance matching structure 7 and a feeder line structure 8;
the microstrip line 6, the impedance matching structure 7 and the feeder line structure 8 are uniformly distributed on the second dielectric substrate 2;
One end of the microstrip line 6 is connected with ports of an external chip transmitter and receiver, and the other end of the microstrip line is connected with one end of the impedance matching structure 7;
the other end of the impedance matching structure 7 is connected with one end of the feeder line structure 8, and the other end of the feeder line structure 8 is connected with the main radiation antenna array;
The individual antenna patch elements 9 of the main radiating antenna array are connected by a feed line structure 8.
Specifically, the microstrip line 6 has an impedance of 50 ohms, and has a feeding function, one end of the microstrip line is connected with ports of an external chip transmitter and an external chip receiver, and the other end of the microstrip line is connected with an impedance matching structure 7 of the main radiating antenna array, so that the excitation of the main radiating antenna array is completed, and the main radiating antenna array can radiate. The impedance matching structure 7 is a quarter-wavelength impedance transformation section. The feeder structures 8 are used to connect the individual antenna patch elements 9, the lengths of the individual sections of feeder structures 8 are unequal, the lengths being approximately equal to lambda 1/2, but the trimming is performed according to the circumstances.
Illustratively, the first dielectric substrate 4 and the second dielectric substrate 2 are both high-frequency plates.
Specifically, the first dielectric substrate 4 and the second dielectric substrate 2 are both high-frequency plates, and the characteristics of the high-frequency plates can affect the resonant frequency and bandwidth of the antenna. The first dielectric substrate 4 and the second dielectric substrate 2 may use the same or different high-frequency boards according to practical situations.
Illustratively, a plurality of metal patch units 10 are arranged on both sides of the axis of the first dielectric substrate 4 along the first direction X;
the main radiating antenna array is arranged on the axis of the second dielectric substrate 2 along the first direction X.
Specifically, the present embodiment is provided with 16 metal patch units 10 symmetrically distributed on both sides of the axis of the first dielectric substrate 4 along the first direction X, and the main radiating antenna array is provided with antenna patch units 9 arranged on the axis of the second dielectric substrate 2 along the first direction X. Other embodiments of the present utility model are not limited to the number of metal patch elements 10 and antenna patch elements 9 of the main radiating antenna array.
The reflection coefficient S11 curve of the simulation of the antenna in this embodiment is shown in fig. 5, and it can be seen from the graph that the working frequency band of the antenna array is 79.24GHz-80.44GHz.
The simulation pattern of the antenna array at 79.5GHz is shown in fig. 6, wherein the maximum gain is 11.35dBi, the beam width of the azimuth plane gain is 109 degrees, and the antenna gain is still larger than 0 when the angle of the azimuth plane of the antenna is +/-100 degrees. When the maximum beam direction of the pitching surface is 0 degrees, the beam width of the pitching surface gain 3dB is 18.93 degrees, and the side lobe level is 17.1dB; when the elevation gain is 0dB, the beam elevation beam width thereof is 38.9 °.
Through verification, the wide-beam millimeter wave antenna provided by the utility model has the characteristics of wide beam, small volume, easiness in integration and the like by adopting a laminated structure to distribute the main radiation antenna array and the metal patch units on different medium substrates and exciting the metal patch units in a coupling mode so as to expand the beam width of the millimeter wave antenna.
The embodiment of the utility model also provides radar equipment, which comprises the wide-beam millimeter wave antenna according to any embodiment of the utility model. The radar device is a wide FOV short range millimeter wave radar.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the utility model, but rather to cover all equivalent variations and modifications in shape, construction, characteristics and spirit according to the scope of the present utility model as defined in the appended claims.
Claims (10)
1. A wide-beam millimeter wave antenna, comprising:
A metal patch layer, a first dielectric substrate, an antenna feed layer, a second dielectric substrate and a metal dielectric layer which are sequentially laminated;
The metal patch layer comprises at least two metal patch units, and the metal patch units are arranged on the first dielectric substrate;
The antenna feed layer comprises a main radiation antenna array, and the main radiation antenna array is arranged on the second dielectric substrate;
And in the thickness direction of the second dielectric substrate, the orthographic projection of the metal patch unit on the second dielectric substrate is at least partially positioned outside the orthographic projection of the main radiation antenna array on the second dielectric substrate, and the two metal patch units are arranged at two sides of the main radiation antenna array at intervals.
2. The broad beam millimeter wave antenna according to claim 1, wherein a projection of each of the metal patch units onto the second dielectric substrate in a plate thickness direction is equal in distance from the main radiating antenna array.
3. The broad beam millimeter wave antenna of claim 2, wherein said first dielectric substrate and said second dielectric substrate each have a first direction and a second direction disposed in a same direction, said first direction and said second direction intersecting;
The projection of each metal patch unit on the second dielectric substrate in the plate thickness direction is overlapped with the main radiation antenna array, the width of the overlapped part is not more than 0.15 millimeter, and the width of the overlapped part is an extension length value in the second direction.
4. The broad beam millimeter wave antenna of claim 3, wherein said main radiating antenna array comprises a plurality of antenna patch elements, said antenna patch elements being rectangular, said antenna patch elements having a largest dimension along said first direction of L1 millimeters and satisfying: l1< lambda 1/2, wherein lambda 1 is the wavelength of the electromagnetic wave propagating in the second dielectric substrate.
5. The broad beam millimeter wave antenna according to claim 4, wherein a width of each of the antenna patch elements of the main radiating antenna array is gradually smaller in the first direction from the middle to the both sides, the width of the antenna patch element being an extension length value in the second direction.
6. The wide-beam millimeter-wave antenna according to claim 3, wherein said metal patch unit is rectangular, a maximum dimension of said metal patch unit in said first direction is L2 mm, and: l2< lambda 2/2, where lambda 2 is the wavelength of the electromagnetic wave propagating in the first dielectric substrate.
7. The wide-beam millimeter-wave antenna of claim 1, wherein said antenna feed layer further comprises: microstrip line, impedance matching structure and feeder line structure;
The microstrip line, the impedance matching structure and the feeder line structure are uniformly distributed on the second dielectric substrate;
one end of the microstrip line is connected with ports of an external chip transmitter and an external chip receiver, and the other end of the microstrip line is connected with one end of the impedance matching structure;
The other end of the impedance matching structure is connected with one end of the feeder line structure, and the other end of the feeder line structure is connected with the main radiation antenna array;
And each antenna patch unit of the main radiation antenna array is connected through the feeder line structure.
8. The broad beam millimeter wave antenna of claim 3, wherein a plurality of said metal patch units are disposed on both sides of an axis of said first dielectric substrate along said first direction;
the main radiation antenna array is arranged on the axis of the second dielectric substrate along the first direction.
9. The broad beam millimeter wave antenna of claim 1, wherein the first dielectric substrate and the second dielectric substrate are both high frequency plates.
10. A radar apparatus, characterized in that the radar apparatus comprises a wide-beam millimeter-wave antenna as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323051866.9U CN220934397U (en) | 2023-11-10 | 2023-11-10 | Wide-beam millimeter wave antenna and radar equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323051866.9U CN220934397U (en) | 2023-11-10 | 2023-11-10 | Wide-beam millimeter wave antenna and radar equipment |
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| Publication Number | Publication Date |
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| CN220934397U true CN220934397U (en) | 2024-05-10 |
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| CN202323051866.9U Active CN220934397U (en) | 2023-11-10 | 2023-11-10 | Wide-beam millimeter wave antenna and radar equipment |
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| CN (1) | CN220934397U (en) |
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- 2023-11-10 CN CN202323051866.9U patent/CN220934397U/en active Active
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