Electrodynamic Analysis and Synthesis of Band-pass Filters on a Rectangular Waveguide with Complex Thin Resonant Diaphragms in the Form of a Double-Shaped C-aperture

A thin resonant single diaphragm with an aperture in the form of a double C-shaped contour is considered. An electrodynamic analysis of this type of diaphragm is carried out. The dependences of the frequency response on the geometric dimensions of the aperture are studied. The possibility of creating band-pass filters on the WR137 waveguide is shown. A computer model of a three-section and five-section band-pass filter is developed. The design of the filters was carried out on a Duroid 5880 substrate. The proposed diaphragm topology makes it possible to obtain higher Q-factors of the resonators and a minimum level of losses in the passband, in comparison with the classical rectangular resonant window.