Analysis of Waveguide Extracted Poles

A fast and accurate modal method for analysing waveguide extracted poles of microwave filters is presented. Basing on a previously presented analysis of a six-port junction in rectangular waveguide [1], by properly shorting the unused ports and reducing the upward directed port the required slot coupling is achieved. Additionally, the case of two contiguous extracted poles is also considered. A parallel FEM analysis of the structures confirms the accuracy of the proposed analysis method.