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A Compact Wideband T/R Switching Circuit Utilizing Quadrature Couplers and Gate-and-Drain-Driven HPAs
Hiromitsu UCHIDA Masatoshi NII Norio TAKEUCHI Yoshihiro TSUKAHARA Moriyasu MIYAZAKI Yasushi ITOH
IEICE TRANSACTIONS on Electronics
Publication Date: 2002/12/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Low-Distortion,High-Power,High-Efficiency Active Device and Circuit Technology)
T/R switching, quadrature coupler, FET, biasing conditions, matching circuit,
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A novel compact T/R (Transmit/Receive) switching circuit for wideband T/R modules has been proposed. It employs quadrature couplers and gate-and-drain-driven HPAs to remove circulators or T/R switches from a conventional T/R module, and T/R switching is made with controlling biasing conditions of the FETs in HPAs. Furthermore, an optimum biasing condition and design of output matching circuit of the HPA have been studied to reduce loss in RX-mode, and the validity of the method has been confirmed by measurements.