A duplexer typically consists of two band pass filters connected in parallel. One filter provides a path between the transmitter and the antenna, the other provides a path between the antenna and the receiver. No direct path between the transmitter and receiver exists.
As mentioned, the obvious advantage of using a duplexer is that one can transmit and receive with only one antenna. With space on towers at base station sites at a premium, this is a real advantage.
In single channel systems, where there is only one transmitter and one receiver, the use of a duplexer is superfluous, so the common antenna is a straightforward choice. When multi-channel systems with several combined transmit and receive channels are considered, our Duplexers come into their own.
Consider this UHF example: Imagine we have two combined transmit channels at 400MHz and 400.5MHz, and two related receive channels at 396MHz and 396.5MHz (4MHz transmit to receive frequency separation is typical at UHF). This achieved with a Duplexer.
For more information please contact our friendly sales staff who will be delighted to discuss your needs and advise when possible.