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

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

699

Lastpage

702

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 WGE_7,0,0 and the WGH_9,0,0) 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International

Conference_Location

Seattle, WA

ISSN

1075-6787

Print_ISBN

0-7803-7028-7

Type

conf

DOI

10.1109/FREQ.2001.956366

Filename

956366