Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3086877
Keywords
dielectric resonators; optical resonators; permittivity; Q-factor; titanium compounds; whispering gallery modes
Categories
Funding
- Engineering and Physical Sciences Research Council
- EPSRC [EP/F067828/1, EP/F035853/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F035853/1, EP/F067828/1] Funding Source: researchfish
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The highest Q-factor resonators employ whispering gallery modes in single-crystal sapphire but have poor temperature stability. Rutile was the first dielectric material used to construct a microwave dielectric resonator. However, its very high temperature coefficient of permittivity made it unsuitable for practical applications. This paper reports a high Q-factor (50 000) and temperature-stable spherical Bragg reflector resonator based on polycrystalline rutile operating at 29.9 GHz. Temperature stability is achieved by adjusting the electric filling factor of a spherical shell so that in combination with its highly negative temperature coefficient of permittivity, the effect of thermal expansion is exactly cancelled out.
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