Patent ID: 6828880
Filing Date: 2004-12-07
Classification: H01P

Abstract:
A bandpass filter comprising a dielectric block having a top surface, a bottom surface and four side surfaces, said dielectric block being constituted of a first portion lying between a first cross-section of the dielectric block and a second cross-section of the dielectric block substantially parallel to the first cross-section and second and third portions divided by the first portion and metal plates formed on one or more of the surfaces of the dielectric block, thereby enabling the first portion of the dielectric block and the metal plates formed thereon to act as an evanescent waveguide, the second portion of the dielectric block and the metal plates formed thereon to act as a first resonator, and the third portion of the dielectric block and the metal plates formed thereon to act as a second resonator, the metal plates including at least one exciting electrode formed on the bottom surface which has the widest area.