DUAL MODE BAND-PASS FILTER AND FREQUENCY CONTROL METHOD FOR ATTENUATION ELECTRODE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a dual mode band-pass filter improved in the degree of freedom for design, capable of attaining miniaturization and facilitated in the design and control of an attenuation electrode. ;SOLUTION: Concerning a dual mode band-pass filter 11, a metal film 13 is formed on one side of a dielectric substrate 12 or inside the dielectric substrate, a through hole 13x is formed for coupling two of resonance on the metal film 13, a ground electrode is formed so as to be overlapped with the metal film 13 through at least one part of the dielectric substrate, capacitive coupling of patterns 14 and 15 for capacitor formation is performed to the metal film 13, and the patterns 14 and 15 for capacitor formation comprise an input/output coupling circuit.;COPYRIGHT: (C)2001,JPO