Design and development of ultra wide band transmitter leakage and reflected power canceller

This paper describes the design and development of an ultra wide band (UWB) transmitter leakage and reflected power canceller (RPC), which enables a linear Frequency Modulated (FM)-CW monostatic radar to achieve high transmit and receive isolation of 35dB henceforth, increasing the sensitivity of receiver. In this proposed RPC Tx-Rx isolation is insensitive to antenna return loss variation from 10dB to 20dB. The proposed structure is realized on multilayer FR4, using multi-section couplers (for achieving 100% bandwidth) in tandem configuration to realize tightly coupled 3dB hybrids with less stringent requirement on fabrication tolerance.