Deembedding of filters´ responses from diplexer measurements

Summary form only given, as follows. In this paper we present a method to compute the characteristic polynomials of two filters embedded in a diplexer for which a set of measured scattering parameters is given. This method works without particular assumptions on the junction or the lossless nature of the filters and is based on a rational fitting derived from the analytical expression of the diplexer response. This procedure is typically meant as a deembeding step to yield the coupling matrices of the filters to be tuned.