Title :
Novel temperature control of a sapphire loaded cavity oscillator from the difference frequency of WGE and WGH modes
Author :
Tobar, Michael E. ; Ivanov, Eugene N. ; Hartnett, John G. ; Locke, Clayton R.
Author_Institution :
Univ. of Western Australia, Crawley, WA, Australia
fDate :
6/23/1905 12:00:00 AM
Abstract :
Novel temperature control circuits have been designed to stabilize the temperature of a Sapphire Loaded Cavity (SLC) Whispering Gallery resonator-oscillator and improve its medium-term frequency stability. The temperature control sensor operates from the difference frequency between Whispering Gallery quasi-TE (WGH) and quasi-TM (WGE) modes (dual-mode operation), which have different temperature coefficients of frequency due to the anisotropy of sapphire. The design concept was verified at room temperature at 9 GHz with a SLC resonator capable of supporting two orthogonal modes (the WGE7,0,0 and the WGH9,0,0) separated by 79 MHz. A discussion of the noise performances of different configurations of dual-mode SLC oscillators is presented
Keywords :
cavity resonators; frequency stability; microwave oscillators; sapphire; temperature control; 9 GHz; Al2O3; dual-mode operation; medium-term frequency stability; noise performances; orthogonal modes; sapphire loaded cavity; temperature control circuits; temperature control sensor; whispering gallery resonator oscillator; Anisotropic magnetoresistance; Copper; Electromagnetic heating; Filling; Frequency; Microwave oscillators; Polarization; Probes; Temperature control; Temperature sensors;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-7028-7
DOI :
10.1109/FREQ.2001.956366
