ANN and EM based models for fast and accurate modeling of excitation loops in combline-type filters

A fast hybrid model for accurate modeling of excitation loops and taps in a class of coupled coaxial cavity filters is presented. The model consists of a lumped element equivalent circuit and a set of fast parametric models including an EM based model for mutual coupling and a neuromodel for parasitic inductance and capacitance of the coupling device. This model provides an ideal tool in synthesis and optimization of combline-type filters and diplexers to minimize the return loss and reduce the cost of post fabrication tunings.