A duplexer is a device that allows bi-directional communication over a single channel. In 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.
A diplexer is a passive device that combines two inputs into a common output. The signals on inputs 1 and 2 occupy different frequency bands. Consequently, the signals on inputs 1 and 2 can coexist on the output without interfering with each other. It is also known as a cross band combiner. A duplexer is a passive device that allows bi-directional (duplex) communication of transmit and receive frequencies within the same band over a single path.
There are two basic types of duplexers: Band Pass and Band Reject.
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