Title :
An uncooled microwave oscillator with 1-million effective Q-factor
Author_Institution :
Radio Eng. Fac., Moscow Power Eng. Inst., Russia
Abstract :
Calculations reveal the possibility of 10-15 dB flicker phase noise reduction in a bridge-type oscillator. A super-low phase noise S-band bipolar transistor oscillator based on a shielded sapphire disc dielectric resonator (SDDR) used as a filtering circulator bridge is considered. With shielding sizes optimized, the SDDR Qφ- factor was ⩽3 × 105 at room temperature. An effective (loaded) oscillator Q-factor of greater than 3 × Qφ, i.e., of about 1 million, was realized
Keywords :
Q-factor; bridge circuits; dielectric resonator oscillators; flicker noise; microwave oscillators; phase noise; 10 to 15 dB; Al2O3; Q-factor; S-band bipolar transistor oscillator; SDDR; bridge-type oscillator; filtering circulator bridge; flicker phase noise; shielded sapphire disc dielectric resonator; uncooled microwave oscillator; Bipolar transistors; Bridges; Dielectrics; Filtering; Microwave filters; Microwave oscillators; Phase noise; Q factor; Resonator filters; Temperature;
Conference_Titel :
Frequency Control Symposium, 1993. 47th., Proceedings of the 1993 IEEE International
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-0905-7
DOI :
10.1109/FREQ.1993.367477
