POLARIZATION-PRESERVING WAVEGUIDE FILTER AND TRANSFORMER

摘要

A microwave waveguide filter comprises 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; wherein 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.