| 摘要 |
PROBLEM TO BE SOLVED: To provide a resonator that is miniaturized by changing to step impedance and has high Qo, and to provide a filter having the resonator and a communication device. SOLUTION: On a dielectric substrate 1, a conductive film 10 is formed. The conductive film 10 has conductor openings APa, APb operating as an inductive region and a conductor opening Apc operating as a capacitive region. Contrarily, a resonant element 100, where a multiple step ring resonant element comprising a conductor line aggregate 2' is formed on a substrate 15, is composed and is mounted to the conductor openings APa, APb operating as the inductive region, thus composing the resonator having high Qo. COPYRIGHT: (C)2005,JPO&NCIPI
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