The highest -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 -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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Research Article| February 27 2009
Temperature-stable and high -factor Bragg reflector resonator
Jonathan Breeze, Jerzy Krupka, Anthony Centeno, Neil McN Alford; Temperature-stable and high -factor Bragg reflector resonator. Appl. Phys. Lett. 23 February 2009; 94 (8): 082906. https://doi.org/10.1063/1.3086877
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