1. A device that allows simultaneous two-way communication over a single channel or transmission line by separating incoming and outgoing signals.
Usage: technical; telecommunications
2. In radio and wireless systems, a component that enables a transceiver to transmit and receive on the same frequency without interference.
Usage: technical; radio engineering

Examples

• The duplexer in the radio system allows the operator to speak and listen on the same frequency.
• Modern cell phones use duplexers to enable full-duplex communication.
• The duplexer isolates the transmitter signal from the receiver to prevent feedback.
• Engineers installed a duplexer to improve the efficiency of the two-way communication network.
• Without a duplexer, the transmitter and receiver would interfere with each other on the same channel.