| 摘要 |
PURPOSE: A resonator, a filter, a duplexer, and a high-frequency circuit apparatus are provided to reduce the conductor loss of an electrode and achieve low-loss operation by forming an electrode formed in a region where the vertical electric field component is zero or close to zero. CONSTITUTION: In the interface between a dielectric and an electrode of the resonator, there are provided a D-region wherein the vertical component of the electric field is large and an S-region wherein the vertical component of the electric field is zero or nearly zero. On the side surfaces of the dielectric which belong to the D-region, divided single-layer conductor films(4) are formed, and on each end surface of the dielectric of the dielectric which is the S-region, a thin-film multilayer electrode is formed. The respective conductor thin films of the thin-film multilayer electrode are connected alternately with the single-layer conductor films(4). By this structure, through the respective conductor thin films of the thin-film multilayer electrode in the S-region, a current having identical amplitude and identical phase flows radially with the symmetrical axis as the center realizing a low-loss thin-film multilayer operation in the S-region.
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