Dual Mode Square SIW Cavity Filter Using Corner Cut Perturbation

This paper presents a new square SIW cavity that is perturbed by displacement of corner vias as a corner cut perturbation. This perturbation causes mode splitting of degenerate modes (TE102 and TE201) of the square SIW cavity. A dual mode filter using this cavity is realized with 2.8% FBW at 6.1GHz and two transmission zeros at 5.55GHz and 6.81GHz. This filter is modeled by the coupling matrix representation based on the global eigen modes and also, the simulation and measurement results of this filter are presented.