Re: Differnce between Duplexer and Diplexer also Circulator
Duplex and diplex depends on the use. There is not physical difference. If signals go both directions, like transmitting and receiving, it is called a duplexer. (Think of full duplex to remember the difference.) If signals go one direction only and are sorted by frequency into different paths, it is called a diplexer.
Circulators and isolators are almost exactly the same. The only difference is the third port (relative to the main input and output) being available for the user (circulator) or terminated into a resistive load inside the case (isolator).