antenna-theory.com

[adel elshahed]

hi
i make a graduated project about radar system , how i choose a duplexer to make the same antenna receive and transmit ,what are the good types and commercial duplexers ,and what are the problems that might meet me

[Schubert]

Some of the problems/considerations are:
a) Linearity - are any harmonics or distortions introduced?
b) Power handling capability
c) Isolation
d) Frequency of operation

Which one you want is a function of the application. You should probably start looking through random data sheets till you understand which ones fit your application.