TRANSISTOR OSCILLATOR WITH DIELECTRIC RESONATOR

Abstract

Generators stabilized by dielectric resonators have found wide application in communications, radar, radio navigation and electronic warfare. A large number of works have been devoted to their research, but increasing requirements for them forces radio equipment developers to look for new technical solutions. Especially important is the stability of the frequency of microwave generators under the influence of vibrations, shocks, temperature changes, changes in supply voltage. The influence of external influencing factors leads to the appearance of parasitic signal parameters – frequency departures, expansion of the spectral line, increase of harmonics and subharmonics. The purpose of this work is to measure the parasitic parameters of the output signal. The object of the study is a serial microwave generator. The paper gives a brief description of it. The generator has the following requirements: – calculation of a dielectric resonator; – simulation of a microstrip filter from the frequency multiplier; – operating frequency 17490 ± 3.5 MHz; – output power of at least 10 dBm; – load resistance 50 ohms; – supply voltage 15 V; – consumption current no more than 215 mA. As the results of the study are presented: – frequency run-out in 15 minutes after switching on; – frequency dependence on supply voltage; – the spectrum of the output signal in the 100 kHz band; – the spectrum of the output signal in the 20 GHz band. The results obtained can be used by students and teachers of radio engineering disciplines, engineers – developers of radio equipment. The article complements the well-known results on the experimental study of generators in terms of parasitic parameters of the output signal. For novice researchers, the experimental technique may be useful.