Summary of Transceiver Isolation Technology for CW Radar Microstrip Antenna

The leakage of transmitter signal seriously restricts the improvement of CW radar detection performance. Microstrip antenna is widely used in miniature CW radars, and its isolation performance is the key to restrict the detection ability of miniature CW radars. In this paper, the techniques of suppressing transmitter signal leakage in CW radar system are analyzed, including transceiver channel cancellation, signal processing, and antenna isolation technology, It is pointed out that the transmission and reception isolation of microstrip antennas is mainly realized by spatial isolation technology, including two types of spatial wave isolation and surface wave isolation. The principles, characteristics and applications of spatial wave isolation technology and surface wave isolation technology are analyzed in detail. Finally, it is pointed out that the main goal of increasing the transceiver isolation is to improve the sensitivity. It is difficult for a single technology to meet the requirements of isolation, and it is necessary to implement multiple methods based on the specific application.