CN221080355U - Bottom feed cavity array antenna and millimeter wave radar device - Google Patents
Bottom feed cavity array antenna and millimeter wave radar device Download PDFInfo
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- CN221080355U CN221080355U CN202322998262.9U CN202322998262U CN221080355U CN 221080355 U CN221080355 U CN 221080355U CN 202322998262 U CN202322998262 U CN 202322998262U CN 221080355 U CN221080355 U CN 221080355U
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Abstract
The utility model discloses a bottom feed cavity array antenna and a millimeter wave radar device, which belong to the technical field of antennas, and comprise an antenna port, a transition section, a cavity and a bottom feed waveguide; the lower end of the cavity is fixedly connected with the bottom feed waveguide; the upper end of the cavity is connected with the antenna port through a transition section; one or more transition sections and one or more antenna ports are arranged; the transmission channels formed in the transition section are in one-to-one correspondence with the antenna through grooves formed in the antenna port and are mutually communicated, and the transition section is communicated with the cavity. By adopting the mode, the utility model adopts waveguide feed, thereby greatly reducing the loss of a feed link; the utility model does not need to be designed in a coplanar manner with the radar chip, can be designed in a layered manner with the radar chip, and effectively reduces the radar size; the utility model has wider working bandwidth.
Description
Technical Field
The utility model relates to the technical field of antennas, in particular to a bottom feed cavity array antenna and a millimeter wave radar device.
Background
Millimeter wave radar is a radar working in millimeter wave band detection, the frequency band is generally 30 GHz-300 GHz, the wavelength is 1-10 mm, and the wavelength is between microwaves and centimeter waves. 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, has the characteristic of all-weather full-time operation, and has the advantages that the millimeter wave radar becomes one of the core sensors of advanced auxiliary driving and unmanned driving.
With the deep development of advanced auxiliary driving, the vehicle millimeter wave radar is also jumped from a 3D radar to a 4D imaging radar, and on the basis of the original distance dimension, speed dimension and azimuth dimension, the radar is required to have more channels and higher resolution and correspondingly more radar antennas. However, the microstrip array antenna widely used at present still has the following defects:
1. The microstrip array antenna is fed by a planar transmission line, so that the dielectric loss is large;
2. The antenna needs to be designed in a coplanar manner with the radar chip, and the size of the vehicle-mounted radar is necessarily increased along with the increase of the number of the antennas;
3. The bandwidth is narrow.
Based on the above, the utility model designs a bottom feed cavity array antenna and a millimeter wave radar device to solve the above problems.
Disclosure of utility model
In view of the above drawbacks of the prior art, the present utility model provides a bottom feed cavity array antenna and a millimeter wave radar device.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
the bottom feed cavity array antenna comprises an antenna port, a transition section, a cavity and a bottom feed waveguide;
The lower end of the cavity is fixedly connected with the bottom feed waveguide;
the upper end of the cavity is connected with the antenna port through a transition section;
one or more transition sections and one or more antenna ports are arranged;
The transmission channels formed in the transition section are in one-to-one correspondence with the antenna through grooves formed in the antenna port and are mutually communicated, and the transition section is communicated with the cavity.
Further, when one transition section is provided, a plurality of groups of vertically penetrating transmission channels are formed in the transition section.
Furthermore, when the transition sections are multiple, a group of vertically penetrating transmission channels are formed in each transition section.
Furthermore, when one antenna port is arranged, a plurality of groups of antenna through grooves which penetrate up and down are formed in the antenna port.
Furthermore, when the number of the antenna ports is plural, a group of antenna through grooves penetrating up and down are formed in each antenna port.
Furthermore, the number of the transmission channels is consistent with that of the antenna through grooves and corresponds to that of the antenna through grooves one by one, the upper ends of the transmission channels are communicated with the antenna through grooves above the transmission channels, and the lower ends of the transmission channels are communicated with the cavity.
Further, the antenna ports are 1×N array antenna ports, wherein N is more than or equal to 2 and less than or equal to 16; n represents the number of antenna through slots.
Furthermore, the cavity and the bottom feed waveguide are provided with a wide edge and a narrow edge, and the wide edge of the cavity and the narrow edge of the bottom feed waveguide are arranged in parallel or the narrow edge of the cavity and the wide edge of the bottom feed waveguide are arranged in parallel.
Furthermore, the antenna port, the transition section, the cavity and the bottom feed waveguide are integrally formed.
Further, the millimeter wave radar device comprises the bottom feed cavity array antenna and a millimeter wave radar board, wherein the millimeter wave radar board is connected with the bottom feed waveguide.
Advantageous effects
The utility model adopts waveguide feed, thus greatly reducing the loss of feed links;
the utility model does not need to be designed in a coplanar manner with the radar chip, can be designed in a layered manner with the radar chip, and effectively reduces the radar size;
the working bandwidth of the utility model is wider;
The utility model has simple structure and lower requirement on processing precision, and is beneficial to improving the production yield.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a perspective view of a bottom feed cavity array antenna of the present utility model;
Fig. 2 is a front view of a bottom feed cavity array antenna of the present utility model;
fig. 3 is a left side view of a bottom feed cavity array antenna of the present utility model;
FIG. 4 is a cross-sectional view taken along the direction A-A of FIG. 2;
FIG. 5 is a cross-sectional view taken along the B-B direction of FIG. 3;
fig. 6 is a perspective view of the structure of the bottom feed cavity array antenna with one antenna port according to the present utility model;
Fig. 7 is a perspective view of the structure of the bottom feed cavity array antenna of the present utility model with six antenna ports;
fig. 8 is a plan view of a bottom feed cavity array antenna of the present utility model;
fig. 9 is a structural perspective view of the millimeter wave radar device of the present utility model.
Reference numerals in the drawings represent respectively:
1. the antenna comprises an antenna port 2, a transition section 3, a cavity 4, a bottom feed waveguide 5, a millimeter wave radar board 6, an antenna through groove 7 and a transmission channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of 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 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 be within the scope of the utility model.
The utility model is further described below with reference to examples.
Example 1
Referring to fig. 1-9 of the specification, a bottom feed cavity array antenna comprises an antenna port 1, a transition section 2, a cavity 3 and a bottom feed waveguide 4;
the lower end of the cavity 3 is fixedly connected with the bottom feed waveguide 4;
The upper end of the cavity 3 is connected with the antenna port 1 through the transition section 2;
one or more transition sections 2 and one or more antenna ports 1;
The transmission channel 7 arranged in the transition section 2 corresponds to the antenna through groove 6 arranged in the antenna port 1 vertically one by one and is communicated with each other, and the transition section 2 is communicated with the cavity 3.
The transition section 2 converts the electromagnetic wave signal propagating in the waveguide into a specific electromagnetic field distribution, distributing the electromagnetic wave signal through the transition assembly to the antenna port 1.
Referring to fig. 6 of the specification, when one antenna port 1 is provided, a plurality of groups of antenna through slots 6 penetrating up and down are formed in the antenna port 1;
When the number of the antenna ports 1 is multiple, a group of antenna through grooves 6 penetrating up and down are formed in each antenna port 1;
The number of the transmission channels 7 is consistent with that of the antenna through grooves 6 and corresponds to that of the antenna through grooves 6 one by one, the upper ends of the transmission channels 7 are communicated with the antenna through grooves 6 above the transmission channels, and the lower ends of the transmission channels 7 are communicated with the cavity 3;
The antenna ports 1 are arranged along a straight line, and function of the antenna ports is to radiate radar signals generated by the millimeter wave radar board into a free space and receive electromagnetic waves in the space; the size of the antenna port 1 is adjusted, so that the gain, the horizontal plane beam and the nodding beam of the array antenna can be adjusted;
The antenna ports 1 of the array antenna can be mutually separated, and can also be mutually connected to form an integral antenna port 1;
The transition section 2 is used for realizing impedance matching between the cavity 3 and the antenna port 1 during electromagnetic wave propagation; the size of the transition section 2 is adjusted, so that the cavity 3 can be well matched with the antenna 1;
The cavity 3 is used for converting electromagnetic wave signals propagated in the waveguide into specific electromagnetic field distribution, and distributing the electromagnetic wave signals to a plurality of antenna through grooves 6 of the antenna port 1 through the transition section 2;
The bottom feed waveguide 4 feeds radar signals generated by the millimeter wave radar board 5 into the cavity 3, so that the radar signals are transmitted to the antenna port 1 to radiate, and signals received by the antenna are transmitted to the millimeter wave radar board 5;
In the transmitting process, the high-frequency millimeter wave signal passes through the millimeter wave radar board 5 to the bottom feed waveguide 4, then passes through the cavity 3, passes through the transition section 2, and finally is radiated to free space through the antenna port 1;
the receiving process is exactly opposite to the transmitting process, and millimeter wave signals are transmitted from free space to the antenna port 1, then to the transition section 2, then to the cavity 3, then to the millimeter wave radar board 5 through the bottom feed waveguide 4.
The utility model adopts waveguide feed, thus greatly reducing the loss of feed links;
the utility model does not need to be designed in a coplanar manner with the radar chip, can be designed in a layered manner with the radar chip, and effectively reduces the radar size;
the working bandwidth of the utility model is wider;
The utility model has simple structure and lower requirement on processing precision, and is beneficial to improving the production yield.
Example 2
Referring to fig. 9 of the specification, a millimeter wave radar device includes a bottom feed cavity array antenna and a millimeter wave radar board 5 in embodiment 1;
The millimeter wave radar board 5 is used for generating radar signals and transmitting the radar signals to the bottom feed waveguide 4, and receiving the radar signals conducted by the bottom feed waveguide 4;
In the transmitting process, the high-frequency millimeter wave signal passes through the millimeter wave radar board 5 to the bottom feed waveguide 4, then passes through the cavity 3, passes through the transition section 2, and finally is radiated to free space through the antenna port 1;
the receiving process is exactly opposite to the transmitting process, and millimeter wave signals are transmitted from free space to the antenna port 1, then to the transition section 2, then to the cavity 3, then to the millimeter wave radar board 5 through the bottom feed waveguide 4.
Example 3
Referring to fig. 7 of the specification, the antenna ports 1 are preferably 1×n array antenna ports, where N is 2.ltoreq.n.ltoreq.16; n represents the number of antenna through slots 6;
A schematic of the structure of a bottom feed cavity array antenna with 1 x 6 cavity array antenna ports is shown in fig. 7.
Examples
Referring to the drawings in the specification, preferably, the antenna port, the transition section, the cavity and the bottom feed waveguide are integrally formed.
The bottom feed waveguide is fixedly arranged at the bottom end of the cavity, and the millimeter wave radar antenna is integrally processed. When the bottom feed cavity array antenna is processed, the bottom feed cavity array antenna at least needs to be split into a three-layer structure, and split lines A and B are processed tangent plane direction curves. The antenna and the feed waveguide are designed in a layered mode, space is saved, and the antenna is suitable for application of a large millimeter wave radar antenna array.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. The bottom feed cavity array antenna comprises an antenna port (1) and is characterized by further comprising a transition section (2), a cavity (3) and a bottom feed waveguide (4);
The lower end of the cavity (3) is fixedly connected with the bottom feed waveguide (4);
The upper end of the cavity (3) is connected with the antenna port (1) through the transition section (2);
one or more of the transition sections (2) and one or more of the antenna ports (1);
The transmission channels (7) formed in the transition section (2) are in one-to-one correspondence with the antenna through grooves (6) formed in the antenna port (1) and are communicated with each other, and the transition section (2) is communicated with the cavity (3).
2. The bottom feed cavity array antenna according to claim 1, wherein when one transition section (2) is provided, a plurality of groups of transmission channels (7) penetrating up and down are formed inside the transition section (2).
3. The bottom feed cavity array antenna according to claim 1, wherein when there are a plurality of transition sections (2), a group of transmission channels (7) penetrating up and down are provided inside each transition section (2).
4. The bottom feed cavity array antenna according to claim 2, wherein when one antenna port (1) is provided, a plurality of groups of antenna through slots (6) penetrating up and down are formed in the antenna port (1).
5. A bottom feed cavity array antenna according to claim 3, wherein when there are a plurality of antenna ports (1), a group of antenna through slots (6) penetrating up and down are formed in each antenna port (1).
6. The bottom feed cavity array antenna of claim 5, wherein the number of transfer channels (7) is consistent with the number of antenna through slots (6) and corresponds up and down one by one, the upper end of each transfer channel (7) is communicated with the antenna through slot (6) above the transfer channel, and the lower end of the transfer channel (7) is communicated with the cavity (3).
7. The bottom feed cavity array antenna of claim 6, wherein the antenna ports (1) are 1 x N array antenna ports, where 2N 16; n represents the number of antenna through slots (6).
8. The bottom feed cavity array antenna of claim 7, wherein the cavity (3) and the bottom feed waveguide (4) each have a broad side and a narrow side, the broad side of the cavity (3) being arranged in parallel with the narrow side of the bottom feed waveguide (4) or the narrow side of the cavity (3) being arranged in parallel with the broad side of the bottom feed waveguide (4).
9. The bottom feed cavity array antenna of claim 8, wherein the antenna port (1), transition section (2), cavity (3) and bottom feed waveguide (4) are integrally formed.
10. A millimeter wave radar device comprising the bottom feed cavity array antenna of claim 9 and a millimeter wave radar board (5), the millimeter wave radar board (5) being connected to the bottom feed waveguide (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322998262.9U CN221080355U (en) | 2023-11-07 | 2023-11-07 | Bottom feed cavity array antenna and millimeter wave radar device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322998262.9U CN221080355U (en) | 2023-11-07 | 2023-11-07 | Bottom feed cavity array antenna and millimeter wave radar device |
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| Publication Number | Publication Date |
|---|---|
| CN221080355U true CN221080355U (en) | 2024-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322998262.9U Active CN221080355U (en) | 2023-11-07 | 2023-11-07 | Bottom feed cavity array antenna and millimeter wave radar device |
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| Country | Link |
|---|---|
| CN (1) | CN221080355U (en) |
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2023
- 2023-11-07 CN CN202322998262.9U patent/CN221080355U/en active Active
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