Patent ID: 7663452

Claim:
A waveguide filter with a signal input port at a first end and a signal output port at a second end, comprising: a plurality of metal-bounded ridge-waveguide sections in a cascade configuration including interspersed metal-bounded evanescent-mode coupling regions and having a first end and a second end; and a ridge-waveguide port coupling network at each said end of the cascade assembly for connecting the assembly to respective filter signal ports, wherein each said ridge-waveguide port coupling network includes: a ridge-waveguide element selected from the group consisting of a uniform ridge waveguide section, an iris, a fin, a post, a ridge notch, and an evanescent-mode section; and a circuit element selected from the group consisting of a transition from a strip-type transmission line to ridge waveguide, a strip-type transmission-line element, a conventional lumped reactive circuit element, and combinations thereof.