Patent ID: 7245194

Claim:
A resonator comprising a stack substrate obtained by stacking dielectric layers and conductor layers, said stack substrate including: a grounding conductor layer formed on one end of said stack substrate; and a resonant-pattern conductor formed in a plurality of conductor layers in a stacking direction and having one pair of resonant electrodes each having one end as a short-circuiting end connected to the grounding conductor layer and the other end as an open end, the resonant-pattern conductor being provided opposite the grounding conductor layer via at least one dielectric layer, and wherein the open-end side of one of the resonant electrodes is a signal input terminal and the open-end side of the other one of the resonant electrodes is a signal output terminal, and wherein the pair of resonant electrodes are formed symmetrically in any one of a loop shape and a spiral shape across said plurality of conductor layers in the stacking direction.