| 摘要 |
A coplanar resonator comprising first center electrodes each having open ends and a ground electrode which extends along either side thereof is formed on the upper plane of a dielectric substrate, and second center electrodes and a perimeter electrode are formed on the lower plane of the dielectric substrate, so as to face the above center electrodes and ground electrode. A filter, duplexer, and communication device using this resonator are provided, thereby reducing the size of the resonator part formed of electrode patterns on a dielectric substrate, facilitating reduction in size of the overall device, and increasing no-load Q.
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