What is the function of a diplexer in communication systems?

A diplexer is an essential component in communication systems that enables the simultaneous transmission and reception of signals at different frequencies over the same communication channel. Its primary function is to separate these different frequencies, ensuring that signals do not interfere with one another. This allows for more efficient use of available bandwidth and enables systems to operate more effectively by using a single antenna for multiple frequency bands.

For example, in a wireless communication scenario, a diplexer can allow a transmitter to send a signal on one frequency while a receiver listens on another frequency. This is crucial in systems where space is limited, and utilizing the same hardware for multiple functions must be done without cross-talk or interference.