Patent ID: 8704619
Filing Date: 2014-04-22
Classification: H01P

Abstract:
1. A bandpass filter comprising: a laminated body comprising a plurality of laminated dielectric layers; a ground electrode disposed on a bottom surface of said laminated body; a plurality of strip-shaped first resonance electrodes that are disposed side by side so as to be electromagnetically coupled to each other on a first interlayer of said laminated body, and each one end thereof is operable to be connected to a standard potential to function as a resonator that resonates at a first frequency; a plurality of strip-shaped second resonance electrodes that are disposed side by side on a second interlayer different from said first interlayer of said laminated body so as to be electromagnetically coupled to each other, and each one end thereof is operable to be connected to the standard potential to function as a resonator that resonates at a second frequency which is higher than said first frequency; a strip-shaped first input coupling electrode that is disposed on a third interlayer located between said first interlayer and said second interlayer of said laminated body, facing a first region over more than half the length, in the longitudinal direction, of a first resonance electrode on an input stage of said plurality of first resonance electrodes and electromagnetically coupled to the first region, and that has an electrical signal input point into which first electrical signals are input; a strip-shaped first output coupling electrode that is disposed on said third interlayer of said laminated body, facing a second region over more than half the length, in the longitudinal direction, of a first resonance electrode on an output stage of said plurality of first resonance electrodes and electromagnetically coupled to the second region, and that has an electrical signal output point from which second electrical signals are output; a second input coupling electrode that is disposed on said third interlayer of said laminated body, and that is facing a second resonance electrode on an input stage of said plurality of second resonance electrodes and electromagnetically coupled to the second resonance electrode on the input stage of said plurality of second resonance electrodes; and a second output coupling electrode that is disposed on said third interlayer of said laminated body, and that is facing a second resonance electrode on an output stage of said plurality of second resonance electrodes and electromagnetically coupled to the second resonance electrode on the output stage of said plurality of second resonance electrodes; and wherein: said plurality of first resonance electrodes and said plurality of second resonance electrodes are disposed orthogonally to each other in a direction of lamination of said laminated body, a first portion of said first input coupling electrode faces the first resonance electrode on the input stage of said plurality of first resonance electrodes, said second input coupling electrode is connected to a side farther in the longitudinal direction from said electrical signal input point than the center of said first portion of said first input coupling electrode, said first electrical signals are input into the second input coupling electrode via said first input coupling electrode, a second portion of said first output coupling electrode faces the first resonance electrode on the output stage of said plurality of first resonance electrodes, said second output coupling electrode is connected to a side farther in the longitudinal direction from said electrical signal output point than the center of said second portion of said first output coupling electrode, and said second electrical signals are output from the second output coupling electrode via said first output coupling electrode.