Balanced topology to cancel Tx leakage in CAT radar

Balanced topology in radar front-end is presented, which can reduce Tx leakage to receiver drastically. The balanced radar front-end which is composed of a differential cross-coupled oscillator, two Lange couplers, and a Wilkinson combiner is implemented using commercially available InGaP/GaAs heterojunction bipolar transistor technology. The tuning range of voltage control oscillator is 320 MHz from 25.307 to 25.627 GHz. The peak output power is 0.8 dBm. Average Tx-to-Rx isolation is about 40.5 dB. Since the isolation of the Lange coupler is 19 dB, the additional cancellation due to balanced topology is expected to be 21.5 dB. The chip size is 1.05 x 1.70 mm(2).
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2004-09
Language
ENG
Citation

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, v.14, no.9, pp.443 - 445

ISSN
1531-1309
DOI
10.1109/LMWC.2004.832080
URI
http://hdl.handle.net/10203/1568
Appears in Collection
EE-Journal Papers(저널논문)
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