24-GHz TRANSCEIVER PATCH ARRAY FRONT-END WITH A BALANCED Tx LEAKAGE CANCELLER

Abstract

A new 24-GHz transceiver patch array with a balanced Tx leakage canceller insensitive to antenna impedance variation and mutual coupling among ports is proposed. Consisting of two quadrature hybrids, two ring hybrids, and 4-port feed antenna, high transmit/receive (Tx/Rx) isolation is maintained regardless of antenna impedance variation and antenna mutual coupling. The proposed 4-port feed antenna is configured by dual fed 2x1 patch array having 6.12 and 5.06 dBi of measured Tx and R.v peak gain, respectively. In addition, the proposed architecture undergoes no power loss because of load termination (usually 50 0) in both transmit and receive paths. The proposed architecture obtains the measured Tx/Rx isolation of more than 40 dB stable at 24 GHz regardless of the antenna impedance variation. (C) 2011 Wiley Periodicals, Inc. Microwave Opt Technol Len 53:559-562, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25815