CN216354800U - Frequency-selective planar antenna housing - Google Patents
Frequency-selective planar antenna housing Download PDFInfo
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- CN216354800U CN216354800U CN202123081697.4U CN202123081697U CN216354800U CN 216354800 U CN216354800 U CN 216354800U CN 202123081697 U CN202123081697 U CN 202123081697U CN 216354800 U CN216354800 U CN 216354800U
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- radome
- rectangular metal
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- 239000002184 metal Substances 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 38
- 239000000758 substrate Substances 0.000 claims description 17
- 238000002955 isolation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 abstract description 12
- 230000005855 radiation Effects 0.000 abstract description 5
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000010329 laser etching Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of radars, in particular to a frequency selection planar radome, which comprises a planar radome body and a frequency selection surface, wherein the frequency selection surface is arranged on the inner bottom surface of the planar radome body, the frequency selection surface comprises a plurality of rectangular metal sheets, annular gaps are arranged on the rectangular metal sheets, the centers of the annular gaps are overlapped with the centers of the rectangular metal sheets, the rectangular metal sheets are arranged in a two-dimensional planar array mode by taking the side length of the rectangular metal sheets as a period, and the array size is determined according to actual project requirements. The frequency selection planar antenna housing can reduce the influence on a radiation directional diagram and has an inhibiting effect on signals outside a working frequency band.
Description
Technical Field
The utility model relates to the technical field of radars, in particular to a frequency-selective planar radome.
Background
With the development of economy, the living standard of people is continuously improved, and the safety requirements of people on vehicles are also continuously improved. The millimeter wave vehicle-mounted radar system is one of the guaranteed driving safety, and the antenna is an important component of the vehicle-mounted radar system, and the performance of the antenna directly influences the distance measurement, the precision, the anti-interference capability and the like of the radar. The antenna housing is arranged in front of the antenna and used for protecting the antenna from being influenced by airflow, rain, snow, sand dust, salt fog and other severe environment factors, but most of the existing antenna housings are spherical or planar, but the spherical antenna housings occupy large space, and the planar antenna housings can influence the directional diagram of the antenna and influence the performance of the radar.
Disclosure of Invention
The utility model provides a frequency selection planar antenna housing, which solves the problem that the planar antenna housing in the prior art can influence the directional diagram of an antenna and influence the performance of a radar.
The utility model adopts the following technical scheme: a frequency-selective planar radome comprises a planar radome body and a frequency selective surface, wherein the frequency selective surface is arranged on the inner bottom surface of the planar radome body;
the frequency selection surface comprises a plurality of rectangular metal sheets, annular gaps are formed in the rectangular metal sheets, the centers of the annular gaps are overlapped with the centers of the rectangular metal sheets, and the rectangular metal sheets are arranged in a planar array mode with the side length of the rectangular metal sheets as a period.
Further, the rectangular metal sheet is attached to the inner surface of the planar radome body through an FPC (flexible printed circuit) process or laser-etched on the inner surface of the planar radome body through an LDS (laser direct structuring) technology.
Further, the shape of the annular gap comprises a circular ring or a square ring.
Further, the rectangular metal sheet is square in shape.
Further, still include: and the antenna array is positioned in the plane antenna housing body and is arranged at an interval with the frequency selection surface.
Furthermore, the antenna array comprises a dielectric substrate, a transmitting array antenna and a receiving antenna, wherein the transmitting array antenna and the receiving antenna are both welded on the upper surface of the dielectric substrate.
Furthermore, the transmitting array antenna comprises a plurality of transmitting antennas, the plurality of transmitting antennas are all connected with the power divider, and the power divider is welded on the upper surface of the dielectric substrate.
Further, the dielectric substrate is a PCB.
Furthermore, a grounding metal sheet is arranged on the lower surface of the dielectric substrate.
Furthermore, the antenna array further comprises an isolation antenna, wherein the isolation antenna is arranged on the upper surface of the dielectric substrate, is positioned between the transmitting array antenna and the receiving antenna, and is used for isolating the transmitting array antenna from the receiving antenna.
The utility model has the beneficial effects that: according to the frequency selection planar radome disclosed by the utility model, the frequency selection surface is arranged on the inner surface of the conventional planar radome body, so that the existing structure and appearance are not influenced. Meanwhile, the radiation directional diagram of the antenna in the working frequency band is enabled not to change after penetrating through the planar antenna housing by the frequency selection surface, the influence on the radiation directional diagram of the antenna is reduced, and the planar antenna housing has an inhibiting effect on signals outside the working frequency band of the antenna.
Drawings
Fig. 1 is a schematic structural diagram of a frequency-selective planar radome of the present invention.
Fig. 2 is a schematic diagram of a frequency selective surface structure of the frequency selective planar radome of the present invention.
Fig. 3 is a schematic view of an antenna array structure of the frequency selective planar radome of the present invention.
Fig. 4 is a schematic structural diagram of a rectangular metal sheet of the frequency selective planar radome of the present invention.
Fig. 5 is a schematic structural diagram of a planar radome body of the frequency selective planar radome of the present invention.
Fig. 6 is a cross-sectional view of a frequency selective planar radome of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, a frequency-selective planar radome is provided, a schematic structural diagram of which is shown in fig. 1, and includes a planar radome body 1 and a frequency selective surface 3, where the frequency selective surface 3 is disposed on an inner bottom surface of the planar radome body 1, the frequency selective surface 3 is configured as shown in fig. 2, a rectangular metal sheet 31 is configured as shown in fig. 4, the frequency selective surface 3 includes a plurality of rectangular metal sheets 31, and an annular gap 32 is disposed on the rectangular metal sheet 31. The plurality of rectangular metal sheets 31 are arranged in a planar array, and the arrangement is performed by taking the side length of the rectangular metal sheets 31 as a period, so that two adjacent rectangular metal sheets 31 can be attached to each other without a gap. The array size may be determined according to actual project requirements. A planar radome body is shown in fig. 5.
According to the frequency selection planar radome disclosed by the utility model, the frequency selection surface is arranged on the inner surface of the conventional planar radome body, so that the existing structure and appearance are not influenced. Meanwhile, the radiation directional diagram of the antenna in the working frequency band is enabled not to change after penetrating through the planar antenna housing by the frequency selection surface, the influence on the radiation directional diagram of the antenna is reduced, and the planar antenna housing has an inhibiting effect on signals outside the working frequency band of the antenna.
In an embodiment of the present invention, the rectangular metal sheet 31 is attached to the inner surface of the planar radome body 1 by an fpc (flexible printed circuit) flexible circuit board process or laser-engraved on the inner surface of the planar radome body 1 by an lds (laser direct structuring) laser direct structuring technology. The LDS process is to finish laser circuits on plastic through laser etching, finish metal coatings through chemical plating, and finally realize multi-antenna integration to achieve the effect. The process can improve the yield without affecting the performance of the antenna. The rectangular metal sheet can be a copper sheet.
In one embodiment of the utility model, the metal sheet is square. The annular gap 32 is shaped as a circular ring or a square ring. When the annular gap 32 is a circular hole, the center of the annular gap 32 coincides with the center of the rectangular metal sheet 31. At this time, a circular hole is formed in the center of the rectangular metal sheet 31, and a circular sheet is disposed in the circular hole, and the radius of the circular sheet is smaller than that of the circular hole, so that a circular annular gap 32 is formed. The square ring-shaped annular slit 32 is the same. The use of a circular annular gap 32 is more effective than a square annular gap 32. In one embodiment, the metal sheet may be a rectangular metal sheet 31 of 1.55mm by 1.55mm, wherein the annular gap has an outer diameter of 0.558mm and an inner diameter of 0.508 mm. The frequency band of the frequency selection surface 3 adopting the specification is 76GHz-77 GHz.
In an embodiment of the present invention, as shown in fig. 1 and fig. 6, the present invention further includes an antenna array 2, where the antenna array 2 is located inside the planar radome body 1 and is spaced apart from the frequency selective surface 3. The planar radome body 1 is arranged on the outer side of the antenna array 2 to form a sealing structure for protecting the antenna array 2.
In an embodiment of the present invention, as shown in fig. 3, the antenna array 2 has a structure, where the antenna array 2 includes a dielectric substrate 25, a transmitting array antenna 21 and a receiving antenna 22, the transmitting array antenna 21 and the receiving antenna 22 are disposed in a coplanar manner, the transmitting array antenna 21 includes a plurality of transmitting antennas 23, and the plurality of transmitting antennas 23 are all connected to a power divider 24. The receiving antenna 22 and the transmitting antenna 23 both include a plurality of antenna units, and the plurality of antenna units are connected in series through microstrip lines to form the receiving antenna 22 or the transmitting antenna 23. In the present invention, the receiving antenna 22 has 4 paths, and each receiving antenna 22 is composed of 10 antenna units connected in series through a microstrip line. The transmitting array antenna 21 includes 6 transmitting antennas 23, and the six transmitting antennas 23 are connected by a power divider, which is a one-to-six microstrip power divider with amplitude weighting. Each receiving and transmitting antenna 23 is also composed of 10 antenna units connected in series through a microstrip line. The transmitting array antenna 21 and the receiving antenna 22 are both arranged on the upper surface of the dielectric substrate 25. The lower surface of the dielectric substrate 25 is provided with a grounding metal sheet. The grounding metal sheet is a copper sheet. The dielectric substrate 25 may be a PCB.
In an embodiment of the present invention, the antenna array 2 further includes an isolation antenna 26, and the isolation antenna 26 is disposed between the transmitting array antenna 21 and the receiving antenna 22 for isolating the transmitting array antenna 21 and the receiving antenna 22. The isolated antenna 26 is disposed on the upper surface of the dielectric substrate 25.
The frequency selective surface is formed by periodically arranging unit patterns with specific shapes to form a two-dimensional periodic array structure. When the low-frequency electromagnetic wave irradiates the selection surface, electrons in a large range are excited to move, so that the electrons absorb most of energy, the induced current along the annular gap is small, and the transmission coefficient is small. With the increasing of the frequency of the incident wave, the moving range of the electrons is gradually smaller, the current flowing along the annular gap is increased continuously, and the transmission coefficient is improved. When the frequency of the incident electromagnetic wave reaches a certain value, the electrons at the two sides of the groove just move back and forth under the drive of the electric field vector of the incident wave, and a large induced current is formed around the annular gap. The moving electrons radiate an electric field in a transmission direction through the annular gap of the dipole groove. When the frequency of the incident wave continues to increase, the movement range of electrons is reduced, and when high-frequency electromagnetic waves are incident, the transmission coefficient is reduced, and the reflection coefficient is increased. Therefore, the electromagnetic wave full transmission function in the working frequency band (76-77 GHz) and the function of the total reflection of the electromagnetic wave outside the band are realized.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A frequency-selective planar radome is characterized by comprising a planar radome body (1) and a frequency selection surface (3), wherein the frequency selection surface (3) is arranged on the inner bottom surface of the planar radome body (1);
the frequency selection surface (3) comprises a plurality of rectangular metal sheets (31), annular gaps (32) are formed in the rectangular metal sheets (31), the centers of the annular gaps (32) are overlapped with the centers of the rectangular metal sheets (31), and the rectangular metal sheets (31) are arranged in a planar array mode with the side length of the rectangular metal sheets (31) as a period.
2. The planar antenna radome of claim 1, wherein the rectangular metal sheet (31) is attached to the inner surface of the planar antenna radome body (1) through an FPC (flexible printed circuit) process or laser engraved on the inner surface of the planar antenna radome body (1) through an LDS (laser direct structuring) technology.
3. A frequency selective planar radome according to claim 1 wherein the shape of the annular slot (32) comprises a circular or square ring.
4. A frequency selective planar radome according to claim 1 wherein the rectangular metal sheet (31) is square in shape.
5. A frequency-selective planar radome of any one of claims 1-4 further comprising: the antenna array (2) is located in the planar antenna housing body (1) and is arranged at intervals with the frequency selection surface (3).
6. A frequency selective planar radome according to claim 5 wherein the antenna array (2) comprises a dielectric substrate (25), a transmitting array antenna (21) and a receiving antenna (22), the transmitting array antenna (21) and the receiving antenna (22) being printed on the upper surface of the dielectric substrate (25).
7. The frequency selective planar radome of claim 6 wherein the transmitting array antenna (21) comprises a plurality of transmitting antennas (23), each of the plurality of transmitting antennas (23) is connected to a power divider (24), and the power divider (24) is printed on an upper surface of a dielectric substrate (25).
8. A frequency selective planar radome according to claim 6 wherein the dielectric substrate (25) is a PCB board.
9. The frequency-selective planar radome of claim 6 wherein the dielectric substrate (25) has a ground metal sheet disposed on a lower surface thereof.
10. The frequency selective planar radome of claim 6 wherein the antenna array (2) further comprises an isolation antenna (26), the isolation antenna (26) is disposed on the upper surface of the dielectric substrate (25) and located between the transmitting array antenna (21) and the receiving antenna (22) for isolating the transmitting array antenna (21) and the receiving antenna (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123081697.4U CN216354800U (en) | 2021-12-09 | 2021-12-09 | Frequency-selective planar antenna housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123081697.4U CN216354800U (en) | 2021-12-09 | 2021-12-09 | Frequency-selective planar antenna housing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216354800U true CN216354800U (en) | 2022-04-19 |
Family
ID=81161344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123081697.4U Active CN216354800U (en) | 2021-12-09 | 2021-12-09 | Frequency-selective planar antenna housing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216354800U (en) |
-
2021
- 2021-12-09 CN CN202123081697.4U patent/CN216354800U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240807 Address after: 214124 Gaolang East Road, Wuxi Economic Development Zone, Jiangsu Province 999-8-D2-250 Patentee after: Weifu Zhigan (Wuxi) Technology Co.,Ltd. Country or region after: China Address before: No.5, Huashan Road, Xinwu District, Wuxi City, Jiangsu Province Patentee before: WUXI WEIFU HIGH-TECHNOLOGY Co.,Ltd. Country or region before: China |
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| TR01 | Transfer of patent right |