An uncooled microwave oscillator with 1-million effective Q-factor

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 si...

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Bibliographic Details
Main Author: Tsarapkin, D.P.
Format: Conference Proceeding
Language:English
Subjects:
Bipolar transistors
Bridges
Dielectrics
Filtering
Microwave filters
Microwave oscillators
Phase noise
Q factor
Resonator filters
Temperature
Online Access:Request full text
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Summary: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 Q/sub /spl phi//- factor was /spl les/3 /spl times/ 10/sup 5/ at room temperature. An effective (loaded) oscillator Q-factor of greater than 3 /spl times/ Q/sub /spl phi//, i.e., of about 1 million, was realized.< >
DOI:10.1109/FREQ.1993.367477