| 摘要 |
PROBLEM TO BE SOLVED: To obtain a simple resonator with a high Q and a wide variety of variable resonance frequency range by allowing the resonator to have a photoconductive element connected between two points of a conductive board and a projector to emit a light to the photoconductive element to change the impedance of the photoconductive element. SOLUTION: The conductive disk board 31 that has a slit 30 at its side (upper side) opposite to the side opposing to a dielectric resonator 21 and whose diameter is nearly the same as that of the dielectric resonator 21 is formed by patterning conductors of a printed circuit board, and the photoconductive element 22 is mounted on an outer circumferential part of the conductive disk board 31 by bridging over the slit 30. Furthermore, a hole penetrated through a conductor wall 25 is made to a part of the conductor wall 25 that forms an upper bottom of a cavity and the projector 27 consisting of a semiconductor laser 29 and a lens 26 is placed in the hole. Then a laser beam emitted from the projector 27 is adjusted for its convergence by the lens 26 and the resulting beam is given to the photoconductive element 22 to change the impedance of the photoconductive element 22.
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