diplexer fdd
Just a comment about duplexers. As far as I have understood duplexers, they are ,as mentioned, used to route a signal to different transmission lines. I have an example about duplexers in radar systems. Consider an antenna used in radar system. The system has a transmitter and a receiver. When the antenna transmittes it is important that the receiver is isolated, as the receiver cannot handle the same amount power as the transmitter. When the system is receiving, the transmitter has to be isolated. Here a duplexer is used. It makes sure that the receiver is isolated as long as the system transmitts, and the transmitter is isolated as long as the system receives.