HIGH FREQUENCY FILTER USING COPLANAR LINE RESONATOR

摘要

PROBLEM TO BE SOLVED: To provide a high frequency filter capable of forming a plurality of attenuation poles and reducing an insertion loss. SOLUTION: The high frequency filter includes a CPW type resonator comprising a ground conductor formed at one principal side of a substrate and having an opening, and a center conductor provided in the opening; input/output signal lines comprising microstrip lines formed on the other principal side of the substrate and electromagnetically coupled to the resonator. At least one of the input output signal lines includes a traversing part for traversing the resonator and electromagnetically coupled to the resonator to form a loop line for enclosing the one or the other end of the resonator. Further, the high frequency filter is configured to include a stub that is extended from the traverse part of the loop line while being overlapped with the center conductor. COPYRIGHT: (C)2006,JPO&NCIPI