A Method of Improving Transceiver Isolation of Vehicle-mounted Millimeter-Wave Radar Antenna
A millimeter-wave radar, transceiver isolation technology, applied in the direction of antenna, antenna coupling, antenna array, etc., can solve the problems of lack of suppression, uncertain shape of the transmit and receive antenna pattern, poor broadband effect, etc., to reduce Small overall size requirements, avoiding vertical dimensions, and increasing the effect of isolation
Active Publication Date: 2021-10-26
FAW CAR CO LTD
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Problems solved by technology
Second, this structure only suppresses the surface waves between the transmitting and receiving antennas, but hardly suppresses the electromagnetic waves radiated from the antenna space.
Third, the electromagnetic bandgap structure is a resonant structure, which is effective for narrow-band electric frequencies, but not good for broadband
However, the effectiveness of the isolation plate is related to the height of the protruding antenna surface. Although this method saves the lateral size of the radar antenna, it will greatly increase the vertical size of the radar antenna, which is not conducive to the low-profile integration requirements of the millimeter-wave radar.
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[0025] Such as image 3 As shown, the overall size of the radar antenna array is Dx*Dy: 73mm*73mm, including one transmitting antenna 8 and four independent receiving antennas 9 . The entire antenna array is attached to the antenna copper clad layer 1, such as figure 1 shown;
[0026] Such as figure 2 As shown, the microstrip array antenna 8 adopts the form of two columns of microstrip patch antennas 5 fed in series with 10 elements each, and the feed amplitude of each antenna is controlled by adjusting the patch size perpendicular to the vertical direction of the feed line to form Taylor amplitude weighting, resulting in a 25dB sidelobe radiation pattern.
[0027] The 10-element antenna feed point 10 in each row is located between the fifth unit and the sixth unit. The antenna feed point 10 should meet the requirements of reaching the fifth unit and the phase of the sixth unit. The phase of the operating frequency is 180°. The structure See figure 2 The antenna feed st...
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A method for improving the transceiver isolation of a vehicle-mounted millimeter-wave radar antenna. The method effectively improves the isolation of the transceiver antenna by controlling the radiation level of the array pattern of the receiving and transmitting antennas in the airspace around plus or minus 90°. By adopting multiple columns of receiving and transmitting antennas and simultaneously controlling the width of the antenna radiation patch in the direction of the transmitting and receiving array, the coupling on the spatial radiation path of the transmitting and receiving antennas is effectively controlled. When the transceiver adopts a single-column form, under the same spacing and other conditions, the transceiver antenna isolation is about 35dB, and the transmission adopts double-column transmission, and the width of the transmit antenna patch in the array direction is adjusted to increase the transceiver antenna isolation to about 55dB.
Description
technical field [0001] The invention belongs to the technical field of radar and automobile electronics, and relates to a method for improving the transceiver isolation of a vehicle-mounted millimeter-wave radar antenna. Background technique [0002] The safe and intelligent driving of automobiles is a hotspot in the field of automotive electronics. The core device is the radar sensor, and the millimeter wave radar has obvious advantages over other forms of sensors such as ultrasonic, infrared, laser, etc., including: easy to achieve higher Excellent range resolution, no range blind zone, low transmit power, not affected by weather, etc. Therefore, millimeter wave radar has also become the main sensor form of automobile collision avoidance. [0003] At present, the working frequency bands of vehicle-mounted millimeter-wave radars are allocated to 24GHz and 77GHz. The existing standard multi-function chip can realize the functions of radar radio frequency and digital part. ...
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IPC IPC(8): H01Q1/52H01Q1/32H01Q1/38H01Q1/48H01Q21/00H01Q21/12H01Q21/28
CPCH01Q1/3233H01Q1/38H01Q1/48H01Q1/525H01Q21/0006H01Q21/12H01Q21/28
Inventor 王亮马文峰节忠海白一迪雷凯郑岩杨冉王瑞林王瑞琳李成浩黄晓慧赵一张诗宇
Owner FAW CAR CO LTD