Microwave multiplexers using complementary triplexer filters

This paper describes the design procedure of a multiplexer using the complementary triplexer filter. The described technique allows one to accomplish matched structures with a large range of frequencies. The required network conditions that can be realizable with complementary filters are shown. The design procedure is developed for the bandpass and bandstop complementary filters connected at a common junction for narrow band applications. A stripline structure was employed to realize one triplexer. There is good agreement between the experimental and theoretical results.