OSCILLATOR EQIPPED WINTH DIELECTRIC RESONATOR WHOSE FREQUENY IS TUNED ELECTRONICALLY BY VARACTOR ESPECIALLY AT ABOUT 22GHZ

摘要

PURPOSE: To facilitate the adjustment of an oscillated frequency by arranging 1st and 2nd strip lines in a line, connecting an active element to its terminals, connecting a varactor diode to a 3rd strip line and connecting two dielectric resonators to the 1st strip line. CONSTITUTION: The gate and the drain of an active electronic element having a negative resistance such as a GaAs FET 17 are respectively connected to strip lines 10, 11. One terminal of a varactor diode 26 is connected to a terminal of a strip line 12, and the other terminal is grounded via a strip line 27 and a hole 25. A proper coupling is formed between the varactor 26 and the FET 17 in the dielectric resonator 40. Furthermore, the dielectric resonator 41 is useful to properly adjust an output frequency of an oscillator. By the use of the dielectric resonators 40, 41 the coupling function and a frequency adjustment function are separate to some extent, and the adjustment of the frequency can be executed flexibly and easily more than in the case using only one dielectric resonator. The output frequency is increased/decreased without operating the resonator 40 by changing the height of the dielectric resonator 41.