A duplexer is a device that allows bi-directional (duplex) communication over a single path. In radar and radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna. Most radio repeater systems include a duplexer. Note 1: A duplexer must be designed for operation in the frequency ban...
(from the article `radar`) ...that is radiated by the antenna. In a sense, an antenna acts as a `transducer` to couple electromagnetic energy from the transmission line to ...
a device enabling an antenna to be used for transmitting and receiving simultaneouslya transmission line device allowing the same antenna to be used for transmission and reception
an automatic electronic switching device that permits the use of the same antenna for transmitting and receiving.