RESONANCE FREQUENCY ADJUSTMENT MECHANISM FOR DIELECTRIC RESONATOR

摘要

PURPOSE:To make the change of no-load Q by the adjustment of a resonance frequency small, to stably fix a tuning rod after the adjustment without using an adhesive material or the like and to easily perform readjustment. CONSTITUTION:A hole 14 is provided in the axial center part of a dielectric resonator 11 and the tuning rod 15 is screwed and inserted to the hole 14. A female screw 14a is formed on the inner peripheral surface of the hole 14, a male screw 15a is formed on the outer peripheral surface of the tuning rod 15 and resin layers 16 and 17 are respectively formed on the surfaces of the female screw 14a and the male screw 15a. The tuning rod 15 is composed of the dielectric material of low loss and a high dielectric constant and the resin layers 16 and 17 are composed of the resin material of low loss provided with elasticity.