VARIABLE FREQUENCY RESONATOR, VARIABLE FREQUENCY OSCILLATOR, AND VARIABLE-FREQUENCY FILTER

摘要

A variable-frequency resonator has a dielectric strip serving as a main line and a dielectric strip serving as a sub line. A dielectric resonator is disposed therebetween, and a diode board is disposed at an intermediate point of the dielectric strip serving as the sub line. The electrical length of the sub line is switched according to the electrically conductive/open state of the diode. With this switching, the resonant frequency of the dielectric resonator is changed. Therefore, a variable-frequency resonator having a high Q value, a variable-frequency oscillator having a high C/N ratio, and a variable-frequency filter having low loss are implemented.