The paper presents the synthesis of forth-order waveguide bandpass filter, employing a symmetric configuration and leading to symmetric response with four poles and two transmission zeroes. For this synthesis we aimed to use most appropriate and reliable techniques of analysis, simulation and optimization. In order to reduce the computing time (reduce the number of unknown variables in the optimization) and simplify the further realization of the filter, the coupling between resonating cavities is generated by purely inductive or capacitive iris. Obtained results and commercial software simulator results are presented for validation.

Peer Reviewed