duplexer
Noun
Meaning
duplexer (plural duplexers)
(electronics) A device that enables communication in two directions over a single path.
Examples
Most radio repeater systems include a duplexer.
Note 3: A duplexer must provide sufficient isolation to prevent receiver desensitization.
The alternative type of duplexer is a transmit-receive switch (TR switch) that alternates between connecting the antenna to the transmitter and to the receiver.
Usage of a duplexer can allow the repeater to use one antenna for both receive and transmit at the same time.
With a duplexer the high and low frequency signals are traveling in opposite directions at the shared port of the duplexer.