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TX Leakage Canceller for Small Drone Detection Radar in 2-GHz Band
IEEE Microwave and Wireless Components Letters ( IF 2.374 ) Pub Date : 2020-02-13 , DOI: 10.1109/lmwc.2019.2959441
Sung Jun Lee; Jae Ho Jung; Jong-Won Yu

A transmitter leakage canceller (TLC) having high isolation from a transmitter (TX) to a receiver (RX) is proposed, which is for a single antenna continuous-wave (CW) radar in the 2-GHz band. The proposed TLC is based on three points to obtain sufficient TX-to-RX isolation in a bandwidth of tens of MHz. The first is the use of a quasi-balanced structure in a leakage path and an antileakage path, which makes both signals in the two paths similar in a wide bandwidth. The second point is the adoption of active circuits in the antileakage path, which provides sufficient cancellation between the two signals. However, this adoption makes both signals in two paths with different phase slopes versus frequency; therefore, the sufficient cancellation is confined to a narrow bandwidth. The last is the application of a delay line in the leakage path, which compensates the different phase slopes. Thus, a bandwidth feature of tens of MHz is obtained. Laboratory measurements show more than 60 dB TX-to-RX isolation for an arbitrary targeted 20-MHz bandwidth from 2.3 to 2.7 GHz.
更新日期:2020-02-14

 

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