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