Title :
Quasi-optical stabilisation of millimetre wave sources
Author :
Smith, G.M. ; Lesurf, J.C.G.
Author_Institution :
Dept. of Phys. & Astron., St. Andrews Univ., Fife, UK
Abstract :
A novel tunable quasi-optical scheme is presented to provide stabilization of both fundamental and second-harmonic oscillators at w-band (75-100 GHz), with excellent isolation from the load. A reduction of phase noise by more than 40 dB on free-running Gunn oscillators at 90 GHz was demonstrated with single sideband phase noise better than -120 dBc/Hz at 100 kHz away from the carrier. This stabilization scheme uses external high-Q transmission and reaction stabilizing cavities, where coupling was achieved by using beam-splitters with low power loss. This technique is applicable to almost any existing oscillator at W-band or above, at any frequency.<>
Keywords :
Gunn oscillators; cavity resonators; frequency stability; microwave oscillators; semiconductor device noise; solid-state microwave circuits; 75 to 100 GHz; MM-wave source stabilisation; beam-splitters; external high-Q cavity resonators; free-running Gunn oscillators; fundamental oscillators; isolation from load; phase noise reduction; quasi-optical stabilisation scheme; second-harmonic oscillators; single sideband phase noise; stabilizing cavities; tunable quasi-optical scheme; w-band; Diodes; Frequency; Gunn devices; Local oscillators; Microwave oscillators; Noise reduction; Optical noise; Phase noise; Tunable circuits and devices; Wideband;
Conference_Titel :
Microwave Symposium Digest, 1992., IEEE MTT-S International
Conference_Location :
Albuquerque, NM, USA
Print_ISBN :
0-7803-0611-2
DOI :
10.1109/MWSYM.1992.188080
