Fabrication parameters affecting implementation of waveguide bandpass filter with complementary split-ring resonators

This paper presents an investigation of various phenomena significant for the fabrication process of waveguide structures and their influence on the frequency response. We consider a bandpass waveguide filter implemented using printed-circuit inserts, placed in the transverse plane of a standard WR-90 rectangular waveguide. The filter response is investigated with respect to the implementation technology of the printed-circuit inserts, imperfections of the machine used for fabrication, and precise positioning of the inserts. WIPL-D software is used to accurately model the considered waveguide structures, including the aforementioned phenomena related to the fabrication process. Also, experimental verification is performed to validate the simulation results. The main result of this work is identification of crucial parameters affecting the filter performance. The analysis carried out in this research is important for robust, practical waveguide filter design and implementation.