Method for improving transceiver isolation degree of vehicle-borne millimeter wave radar antenna

Abstract

The invention relates to a method for improving the transceiver isolation degree of a vehicle-borne millimeter wave radar antenna. According to the method, the isolation degree of transceiver antennasis effectively improved by controlling the radiation levels of receiving and transmitting antenna array patterns in airspaces near plus or minus 90 degrees. By adopting multiple columns of receivingand transmitting antennas, the widths of antenna radiating patches in the direction of a transmitting and receiving array are simultaneously controlled, and the coupling on a spatial radiation path ofthe transmitting and receiving antennas is effectively controlled. When a single-column form is employed by receiving and transmitting, the isolation degree of the transceiver antennas is about 35dBunder the same spacing condition, the widths of the transmitting antenna patches in the direction of the array is adjusted, and so that the isolation degree of the transceiver antennas is increased toabout 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. ...

AI Technical Summary

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.

In addition, the isolation board should adopt a metal structure, which will have an uncertain impact on the shape of the pattern of the transmitting and receiving antenna.

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