Title: Transmit-receive switching circuit for radio frequency circulators

Abstract: A transmit-receive switching circuit is provided for switching a transmitter and a receiver to common antenna via a common signal path. A circulator is employed in the common signal path. The flow of transmitter RF energy and received RF energy is controlled through the circulator by a selectively actuable impedance element coupled to the circulator.

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Inventors: Broton, Robert M. (Palatine, IL)

Application Number: 06/317707
Filing Date: 1981-11-02
Publication_date: 1983-04-19
Assignee: MOTOROLA INC

Primary Class(es): 455/80 455/82, 455/83, 333/17.300, 367/903
Other Classes: H04B1/48; H04B1/44; H04B1/48
US Patent Ref:

2914671	November, 1959	De Lange	333/103	Microwave switching circuits
3019431	January, 1962	De Poy et al.	333/103	Pulse radar system with microwave switch
3205493	September, 1965	Cohen	343/876	Microwave switch
3309698	March, 1967	Baldock	455/83	Radar systems
4028645	June, 1977	Tressa	455/80	Automatic impedance matching using resistive and reactive diodes
4055807	October, 1977	Priniski et al.	455/83	Antenna switch

Other Refs:
Primary Examiner: Ng, Jin F.
Assistant Examiner:
Attorney: Kahler, Mark P.
Roney, Edward M.
Gillman, James W.

Claims: