Dual mode self-equalized bandpass filters

Abstract From the Canadian patent

A waveguide self-equalized bandpass filter which comprises a plurality of axially disposed resonant cavities including at least two dual mode cavities. Cross couplings are provided in the dual mode cavities to create a zero-phase difference in the transmission of transverse electric waves. The cross couplings are disposed along the length of the dual mode cavities and along an axis parallel to the longitudinal axis of the filter to achieve passband equalization. The filter may comprise resonant cavities exclusively made of square or cylindrical dual mode cavities or of two cascaded dual mode cavities and a plurality of single mode cavities, the single mode cavities being then axially …