Patent ID: 6580338
Filing Date: 2003-06-17
Classification: H01P

Abstract:
A filter, comprising:a dielectric block; first and second adjacent plated resonator holes located in the dielectric block, each of the plated resonator holes having a stepped configuration with a large sectional area portion corresponding to an open circuit end of the plated resonator hole and a small sectional area portion corresponding to a closed circuit end of the plated resonator hole, a central axes of the large sectional area portion being offset from a central axis of the small sectional area portion; the large sectional area portions of the first and second resonator holes being elongated in a direction perpendicular to an alignment direction defined by an imaginary line extending between the central axes of the two large sectional area portions; an input/output means located in the area of the small cross sectional area portion of the first resonator hole in such a manner that the coupling degree between the first plated resonator hole and the input/output means is determined primarily by the distance between the small cross sectional area portion of the first plated resonator hole and the input/output means whereby the coupling between the first and second plated resonator holes is determined substantially independently of the coupling between the first plated resonator holes and the input/output means.