Polarization-preserving waveguide filter and transformer

摘要

A microwave waveguide filter includes an input waveguide section, an output waveguide section, a plurality of resonator sections disposed between the input and output waveguide sections, and a plurality of coupling sections disposed on either side of each of the resonator sections. The input waveguide section, the resonator sections, and the output waveguide section have at least four fold symmetric quadruple ridge cross-sections and the coupling sections have at least four fold symmetric cross-sections.