Patent ID: 7659799

Claim:
A dielectric waveguide filter comprising: a multi-layered structure of dielectric substrates having first and second ground planes at its top and bottom; first, second, and third waveguide resonators disposed on multiple layers within the multi-layered structure; converters for signal transition between input/output ports and the first and third waveguide resonators; first vias for forming the first, second, and third waveguide resonators; second vias disposed at a boundary surface of the first waveguide resonator and the third waveguide resonator; and a metallized pattern located at the boundary surface of the first and third waveguide resonators, wherein the second vias and the metallized pattern are arranged to control cross-coupling of the first and third waveguide resonators and to form an attenuation pole for removing an image wave at a top or bottom of a pass band.