Duplexers and triplexers are electronic devices used in telecommunications to combine or separate multiple frequency bands. A duplexer is designed to allow a single antenna to be used for both transmitting and receiving signals simultaneously while minimizing interference between the two. Triplexers, on the other hand, are capable of combining or separating three different frequency bands. These devices are commonly used in various communication systems, such as mobile phones, radios, and satellite communication systems. By efficiently managing the frequency spectrum, duplexers and triplexers play a crucial role in enabling reliable and efficient communication.