A diplexer design method using an augmented channel filter approach

A new method of microwave diplexer design is presented. The new technique does not require a final diplexer tuning. The method is a modification of the technique based on accurate channel filters synthesis using surrogate models of coupling coefficients in order to obtain initial structure dimensions [1]. Here the structure optimized during channel synthesis is modified to assure correct loading of the junction. By doing so, the diplexer response after channels synthesis agrees with design specification and diplexer tuning is not needed.