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Circulators/Isolators

Circulators can be operated as duplexers or isolators.
For example, a three port circulator enables transmission from port 1 (typically the transmitter line) to port 2 (typically the antenna line) in one direction (while port 3 is closed) and transmission from port 2 to port 3 (typically the receiver or protection line) in the other direction (while port 2 is closed).
Simply by connecting port 3 to the receiver system the circulator is operated as a duplexer, while terminating port 3 with an impedance matched load turns the circulator into an isolator. Please note that operation as a duplexer is limited by the power rating, as specified by the limits for isolation between port 1 and port 3.
For detailed information submit your RFI here.
http://en.wikipedia.org/wiki/Circulator
http://www.radartutorial.de/17.bauteile/bt33.en.html

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