CN210129581U - Millimeter wave radome and millimeter wave radar - Google Patents
Millimeter wave radome and millimeter wave radar Download PDFInfo
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- CN210129581U CN210129581U CN201920806371.7U CN201920806371U CN210129581U CN 210129581 U CN210129581 U CN 210129581U CN 201920806371 U CN201920806371 U CN 201920806371U CN 210129581 U CN210129581 U CN 210129581U
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Abstract
The utility model relates to a millimeter wave radome for the setting is in the antenna top, including the radome body, the radome body is equipped with inside sunken main wave zone of passing through and distributes the wave zone is passed through in the side around the wave zone is passed through to main, main wave zone setting of passing through is in the radiation the place ahead of antenna, the thickness that main wave zone of passing through is half wavelength or half wavelength's integer multiple, the thickness that the wave zone is passed through to the side is greater than the thickness that main wave zone of passing through. The ratio of the thickness of the side wave-transmitting area to the cosine value of the average incident angle is equal to integral multiple of half wavelength. The utility model discloses a millimeter wave radome passes through the shape and the thickness of control owner wave-transparent area and side wave-transparent area, has not only reduced the reflection of frequency signal in the normal direction, has still reduced the signal attenuation that the radome arouses, does benefit to the cover angle that maintains antenna itself, improves radar wholeness ability.
Description
Technical Field
The utility model relates to a radome technical field, in particular to a millimeter wave radar that is used for millimeter wave radar system's radome and contains this radome.
Background
The millimeter wave radar detects and identifies surrounding targets and environments by sending and receiving high-frequency electromagnetic waves. The farthest detection range that the millimeter wave radar can realize is influenced by the performance of a receiving and transmitting unit of the radar, the number of receiving and transmitting antennas, gain, a multi-Digital Signal Processor (DSP) algorithm and target characteristics, and is closely related to the electrical performance of a radome and a bumper in corresponding bands. After the radome is added, the electromagnetic waves pass through the radome, reflection and loss are generated, and the radiation direction is influenced. At some large angles, the radome may even form a radiation null in that direction, even if the antenna itself covers enough angle, the actual coverage angle of the radar is greatly reduced due to the use of the radome. For the next generation of vehicle-mounted radar, especially angle radar, the wide coverage is one of the important performance indexes. In order to reduce the influence of the radome on the actual coverage angle of the radar, the traditional design generally selects half wavelength and integral multiple of half wavelength of the material as the thickness of the radome. The design and the preset distance between the radome and the antenna can enable the frequency signal to be reflected in the normal direction to be small, and therefore the overall transmission loss caused by the radome is further reduced to a low value. In the case of a frequency signal with a small reflection in the normal direction, the loss caused by the radome is mainly determined by the radome dielectric thickness. Generally, the loss is correspondingly reduced with the smaller radome thickness, which is limited by machinability and strength. If the thickness of the radome deviates from the thickness of half-wavelength and multiples of half-wavelength, the frequency of the minimum reflection is changed, so that the reflection in the frequency and normal direction is increased, and the radiated radio frequency energy is correspondingly reduced, thereby affecting the radar use performance.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve above-mentioned technical problem, provide a millimeter wave radome for the setting is in the antenna top, including the radome body, the radome body is equipped with inside sunken main wave zone of passing through and distributes the wave zone is passed through in the side around the wave zone of passing through to main, main wave zone of passing through sets up the radiation the place ahead at the antenna, the main thickness of passing through the wave zone is half wavelength or half wavelength's integer multiple, the thickness that the wave zone was passed through to the side is greater than the main thickness of passing through the wave zone.
Further, the ratio of the thickness of the side wave-transmitting area to the cosine value of the incident angle is equal to an integral multiple of half wavelength.
Further, the ratio of the thickness of the side wave-transparent area to the cosine value of the average incident angle is equal to an integral multiple of half wavelength, and the average incident angle is the average value of the incident angles of all points in the side wave-transparent area.
Further, the shape of the main wave-transparent area is rectangular, circular or elliptical.
Furthermore, main wave-transparent area, side wave-transparent area and radome body integrated into one piece.
Further, the antenna is a vertically polarized antenna or a horizontally polarized antenna.
Furthermore, the size of the main wave-transparent area is matched with the size of the antenna and the coverage angle of the antenna.
Furthermore, the radome body is made of wave-transparent polycarbonate material or Polycarbonate (PC) material containing polysiloxane.
A millimeter wave radar is based on the millimeter wave radome, and comprises a radar main body, wherein the radar main body is provided with an antenna, a radiation patch is arranged in a preset area of the antenna, and the radiation patch is used for radiating and receiving electromagnetic waves; the radar main part is equipped with the radome in one side corresponding with the antenna, and the radome is used for sealing the radar main part.
The utility model discloses the beneficial technological effect who plays as follows:
compared with the prior art, the utility model discloses a millimeter wave radome, this millimeter wave radome be equipped with inside sunken main wave-transparent area with the corresponding position in antenna radiation the place ahead, and the thickness of main wave-transparent area is medium half wavelength or half wavelength's integer multiple, has reduced the reflection of frequency signal in the normal direction. Meanwhile, a side wave-transmitting area with larger thickness is arranged around the main wave-transmitting area, so that the ratio of the thickness of the side wave-transmitting area to the cosine value of the incident angle is approximately equal to the integral multiple of half wavelength, and the signal attenuation caused by the radar cover on the radiation side is further reduced. By controlling the shapes and the thicknesses of the main wave-transmitting area and the side wave-transmitting area, the reflection of frequency signals in the normal direction is reduced, the signal attenuation caused by the radome is reduced, the coverage angle of the antenna is effectively maintained, and the overall performance of the radar is improved.
Drawings
Fig. 1 is a schematic diagram of a positional relationship between a radome and an antenna in embodiment 1.
Fig. 2 is a schematic structural diagram of the radome and the vertically polarized antenna in embodiment 1.
Fig. 3 is a schematic structural diagram of the radome and the horizontally polarized antenna in embodiment 1.
Fig. 4 is a schematic view of the elliptical structure of the main wave-transmitting region in example 1.
Fig. 5 is a graph of the reflection coefficients of a vertically polarized antenna in the absence of a radome, a half-wavelength radome, and an unequal thickness radome in example 1.
Fig. 6 is the radiation pattern of the vertically polarized antenna in the H-plane under the conditions of no radome, half-wavelength radome and non-uniform-thickness radome in example 1.
Fig. 7 is the radiation pattern of the vertically polarized antenna in the E-plane under the conditions of no radome, half-wavelength radome and non-uniform thickness radome in example 1.
Fig. 8 is a graph of the reflection coefficients of a horizontally polarized antenna without radome, half-wavelength radome, and non-uniform thickness radome conditions in example 1.
Fig. 9 is the radiation pattern of the horizontally polarized antenna in the E-plane under the conditions of no radome, half-wavelength radome and non-uniform-thickness radome in example 1.
Fig. 10 is the radiation pattern of the horizontally polarized antenna in the H plane under the conditions of no radome, half-wavelength radome and non-uniform thickness radome in example 1.
Fig. 11 is a radiation pattern of a vertically polarized antenna to which the double radome design is applied in example 1.
Fig. 12 is a radiation pattern of a horizontally polarized antenna using the double radome design of example 1.
Reference numerals:
the radar antenna comprises an antenna 1, a radome body 2, a main wave-transmitting area 21, a side wave-transmitting area 22 and a radar main body 3.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand for those skilled in the art and will therefore make the scope of the invention more clearly defined.
Example 1:
as shown in fig. 1, the present embodiment provides a millimeter wave radome for being disposed above an antenna 1, the antenna 1 being a vertically polarized antenna or a horizontally polarized antenna, as shown in fig. 2 and 3. This millimeter wave radome includes radome body 2, be equipped with on radome body 2 and inwards sunken main wave-transparent area 21 and the side wave-transparent area 22 that distributes around main wave-transparent area 21, side wave-transparent area 22 and main wave-transparent area 21 seamless connection. The main wave-transmitting area 21, the side wave-transmitting area 22 and the radome body 2 may be integrally formed by using the same material, or may be formed by splicing different materials, which is not limited herein. The millimeter wave radar cover is generally made of wave-transparent polycarbonate material or PC material containing polysiloxane. The main wave-transmitting area 21 arranged on the radome body 2 is distributed in front of the radiation of the antenna 1, the thickness of the main wave-transmitting area 21 is half wavelength or integral multiple of half wavelength, and the thickness of the side wave-transmitting area 22 is larger than that of the main wave-transmitting area 21.
Preferably, the ratio of the thickness of the side wave-transparent region 22 to the cosine of the incident angle is equal to an integral multiple of a half wavelength. Due to the different incident angles of the points in the side wave-transmitting region 22, the thicknesses of the points in the side wave-transmitting region 22 are different, that is, the side wave-transmitting region 22 is a curved surface structure with gradually changed thickness. As the incident angle increases, the transmission distance of the signal in the side wave-transmitting region 22 is equal to the thickness of the side wave-transmitting region 22 divided by the cosine of the incident angle, and therefore, controlling the ratio of the thickness of the side wave-transmitting region 22 to the cosine of the incident angle to be equal to an integral multiple of a half-wavelength can effectively reduce the attenuation of the signal caused by the radome in that direction.
However, in the radome processing process, the preparation process of the side wave-transmitting region 22 with the curved surface structure is complex, the processing difficulty is high, and the radome processing cost is high. Therefore, in the actual processing, the side wave-transmitting region 22 is generally formed to have a uniform thickness, the thickness of the side wave-transmitting region 22 is appropriately deviated from the half wavelength and the integral multiple thereof, and the ratio of the thickness of the side wave-transmitting region 22 to the cosine value of the average incident angle is controlled to be equal to the integral multiple of the half wavelength, as shown in fig. 1 to 4. The average incident angle is an average value of incident angles of points in the side wave-transmitting region 22 of the electromagnetic wave signal emitted from the antenna 1. By controlling the ratio of the thickness of the side wave-transmitting region 22 to the cosine value of the average incident angle to be equal to the integral multiple of the half wavelength, the transmission distance of the signal incident to the side wave-transmitting region 22 can be approximately equal to the integral multiple of the half wavelength, and the signal attenuation caused by the radome can be reduced as much as possible on the basis of simplifying the process. No matter the side wave-transmitting area 22 is a curved surface structure with gradually changed thickness or a plane structure with uniform thickness, the side wave-transmitting area 22 and the main wave-transmitting area 21 are kept flat on the side opposite to the antenna 1, namely the radome body 2 is of a plane structure on the side opposite to the antenna 1.
Preferably, as shown in fig. 1, when the radome body 2 having the uniform thickness in the side wave-transmitting region 22 is prepared, the entire radome body 2 is first formed to have a thickness deviating from a half wavelength and a multiple thereof, and then holes are dug in positions of the radome body 2 corresponding to the antennas 1, so that a cavity-like structure is formed in the radome body 2, and the thickness of the radome body 2 corresponding to the antennas 1 is controlled to be a half wavelength and a multiple thereof. Taking the half wavelength of the medium of 1.4mm as an example, the thickness of the whole radome body 2 is made to be 1.8mm deviated from the half wavelength, and then holes are dug at the position of the radome body 2 corresponding to the antenna 1, so that the thickness of the radome body 2 corresponding to the antenna 1 is 1.4 mm.
Preferably, as shown in fig. 1 to 4, the shape of the main wave-transparent region 21 may be rectangular, circular, oval, rhombic, triangular, or the like. The size of the main wave-transmitting area 21 needs to be matched with the size of the antenna and the coverage angle of the antenna. That is, the specific size of the main wave-transparent region 21 needs to be continuously optimized in combination with the size of the antenna 1 and the coverage angle of the antenna 1 of interest until the thickness of the medium through which the signal with the smaller incident angle passes is approximately equal to the thickness of the medium above the antenna 1, and the thickness of the medium through which the signal with the larger incident angle passes is approximately equal to the thickness of the medium deviated by half a wavelength and multiples thereof divided by the cosine of the incident angle.
The radome bodies 2 with the uniform thickness of the side wave-transmitting regions 22 prepared in this embodiment are respectively disposed on the vertical polarization antenna and the horizontal polarization antenna, and the radiation performance of the vertical polarization antenna and the horizontal polarization antenna is detected, and the results are shown in fig. 5 to 12. In which fig. 5 and 8 show the change of the reflection coefficient. Both fig. 5 and fig. 8 show that the addition of the radome has little effect on the matching bandwidth and matching degree of the overall radiating element. Fig. 6, 7, 9, 10 show the radiation pattern changes after the radome is added. The radiation pattern at elevation remains substantially constant while the horizontal pattern shows that the antenna gain is improved for large angles after the addition of the present radome. Compared with the traditional half-wavelength antenna cover, the vertical polarization antenna is +/-75oThe gain is increased by 5dB, and the antenna gain of the radar cover is between 50 DEG and 75 DEG and exceeds the radiation intensity of a pure antenna without using any radar cover. Correspondingly, for a horizontally polarized antenna, the gain of the radome exceeds that of a traditional half-wavelength radome within the range of 25-75 degrees. Specific amplification performance comparison graphs are shown in fig. 11 and 12. Thus, using this radome design approach, coverage at a greater level is possibleThe gain of the radar antenna is improved within the range of the cover, and the directional diagram of the pitching surface and the bandwidth of the radiation unit are not influenced. The disadvantage is that the antenna gain drops and an unevenness of around 1.5dB occurs over a small angle range.
The millimeter wave radome disclosed in the embodiment adopts a design method combining two thicknesses, the thickness of the half wavelength and the multiple of the half wavelength is used near the normal direction, and the thickness deviating from the half wavelength and the multiple is used in the other side radiation directions, namely, a structure with a thin medium above the antenna and a thick medium around the antenna is formed.
Example 2:
the embodiment discloses a millimeter wave radar, based on the millimeter wave radome provided in embodiment 1, the millimeter wave radar specifically includes a radar main body 3, and the radar main body 3 has an antenna 1. A radiation patch for radiating and receiving electromagnetic waves is provided in a predetermined area of the antenna 1. Radar main part 3 is equipped with the radome in one side corresponding with antenna 1, and the radome is used for sealing radar main part 3, and the setting of radome has effectively prevented that send signal and received signal are impaired. In this embodiment, radome body 2 is through mode integrated into one piece that moulds plastics, and radome body 2 is equipped with the protective layer that silicon organic paint made in one side of carrying on the back mutually with antenna 1 for protection radome body 2 avoids damaging
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A millimeter wave radome is used for being arranged above an antenna and is characterized by comprising a radome body (2), wherein the radome body (2) is provided with a main wave-transmitting area (21) which is inwards concave and side wave-transmitting areas (22) which are distributed around the main wave-transmitting area (21), the main wave-transmitting area (21) is arranged in front of radiation of the antenna (1), the thickness of the main wave-transmitting area (21) is half wavelength or integral multiple of half wavelength, and the thickness of the side wave-transmitting area (22) is larger than that of the main wave-transmitting area (21).
2. A millimeter wave radome according to claim 1 wherein the ratio of the thickness of the side wave-transparent region (22) to the cosine of the angle of incidence is equal to an integer multiple of half a wavelength.
3. A millimeter wave radome according to claim 1 wherein the ratio of the thickness of the side wave-transparent region (22) to the cosine of the average angle of incidence, which is the average of the angles of incidence of the points within the side wave-transparent region (22), is equal to an integer multiple of a half wavelength.
4. A millimeter-wave radome as claimed in claim 1 wherein the shape of the main wave-transparent region (21) is rectangular, circular or elliptical.
5. A millimeter wave radome according to claim 1 wherein the main wave-transparent region (21), the side wave-transparent region (22) and the radome body (2) are integrally formed.
6. A millimeter wave radome according to claim 1, characterized in that the antenna (1) is a vertically polarized antenna or a horizontally polarized antenna.
7. A millimeter-wave radome as claimed in claim 1 wherein the size of the main wave-transparent region (21) is matched to the antenna size, the antenna coverage angle.
8. A millimeter wave radome according to claim 1 wherein the radome body (2) is made of a wave transparent polycarbonate material or a PC material containing polysiloxane.
9. A millimeter wave radar based on a millimeter wave radome of any one of claims 1-8, comprising a radar body (3), wherein the radar body (3) is provided with an antenna (1), and a radiation patch is arranged in a predetermined area of the antenna (1) and is used for radiating and receiving electromagnetic waves; the radar main body (3) is provided with a radar cover on one side corresponding to the antenna (1), and the radar cover is used for sealing the radar main body (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920806371.7U CN210129581U (en) | 2019-05-31 | 2019-05-31 | Millimeter wave radome and millimeter wave radar |
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| CN201920806371.7U CN210129581U (en) | 2019-05-31 | 2019-05-31 | Millimeter wave radome and millimeter wave radar |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342208A (en) * | 2020-03-18 | 2020-06-26 | 维沃移动通信有限公司 | Antenna assembly and electronic equipment |
| CN111446547A (en) * | 2020-05-25 | 2020-07-24 | 上海载德信息科技股份有限公司 | Antenna housing and millimeter wave radar device |
| CN112688050A (en) * | 2020-12-07 | 2021-04-20 | 联想(北京)有限公司 | Electronic equipment and control method thereof |
| CN114696068A (en) * | 2020-12-25 | 2022-07-01 | 中国科学院沈阳自动化研究所 | A multi-band antenna integrated device for submarine and its data acquisition method |
| CN115015898A (en) * | 2021-03-04 | 2022-09-06 | 智能雷达系统有限公司 | Radar apparatus for detecting target object |
-
2019
- 2019-05-31 CN CN201920806371.7U patent/CN210129581U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342208A (en) * | 2020-03-18 | 2020-06-26 | 维沃移动通信有限公司 | Antenna assembly and electronic equipment |
| CN111446547A (en) * | 2020-05-25 | 2020-07-24 | 上海载德信息科技股份有限公司 | Antenna housing and millimeter wave radar device |
| CN112688050A (en) * | 2020-12-07 | 2021-04-20 | 联想(北京)有限公司 | Electronic equipment and control method thereof |
| CN114696068A (en) * | 2020-12-25 | 2022-07-01 | 中国科学院沈阳自动化研究所 | A multi-band antenna integrated device for submarine and its data acquisition method |
| CN115015898A (en) * | 2021-03-04 | 2022-09-06 | 智能雷达系统有限公司 | Radar apparatus for detecting target object |
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