| 摘要 |
PURPOSE:To obtain a dielectric resonator device whose resonance frequency is varied by a control voltage by providing a piezoelectric displacement element and using the displacement of the piezoelectric displacement element so as to move nearly or remotely a frequency adjusting member to/from the dielectric resonator. CONSTITUTION:A cylindrical conductor case 1 has an inner diameter, where cut-off characteristic is attained in the operating frequency region and a (ZrSn)TiO4 ceramic dielectric resonator 2 operated in the TE01delta resonance mode of cylindrical shape is fixed in the case 1 via a cylindrical forsterite spacer 3. A piezoelectric bimorph element 4 of a plate shape being an example jof a piezoelectric displacement element is arranged above the resonator 2 and one end of the element 4 is fixed to the case 1 via an insulation spacer 5. A DC variable voltage is impressed from a power supply to the element 4 and when the voltage is increased, the distance DELTAt between the element 4 and the resonator 2 is reduced. Since an electrode film 7 made of a dielectric material such as silver exists in the element 4, the same effect as seen in a conventional method as the approaching or parting a metallic screw to/from a resonator is attained.
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