A switching device used in radar topermit alternate use of the same antenna for both transmitting andreceiving;. Other forms of duplexers serve for two-way radiocommunication using a single antenna at lower frequencies. It is adevice that combines two or more signals into a common channel ormedium to increase its transmission efficiency. Also known asduplexing assembly. A duplexer is also an add on accessory forprinters, and it allows one to print on both sides of the paperautomatically. An electronic device using sharply tuned resonatecircuits to isolate a transmitter from a receiver. Duplexer allows bothof them to operate on the same antenna at the same time without thetransmitter RF frying the receiver. The common application of aduplexer is to connect a dual band mobile radio's two antennaconnections to a common feed line and antenna. Duplexers are completelydifferent and much simpler to build devices than a repeater duplexer.

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