Microwave characterisation of CaF2 at cryogenic temperatures using a dielectric resonator technique

Jacob, Mohan V., Mazierska, Janina, Ledenyov, Dimitri, and Krupka, Jerzy (2003) Microwave characterisation of CaF2 at cryogenic temperatures using a dielectric resonator technique. Journal of the European Ceramic Society, 23 (14). pp. 2617-2622.

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Properties of calcium fluoride (CaF2) have been well researched at UV, visible and IR range of frequencies but not at microwave frequencies. In this work we report the loss tangent and the real part of relative permittivity var epsilonr of CaF2 measured in the temperature range 15–81 K and at frequency 29.25 GHz. The tanδ and var epsilonr were determined by measurements of the resonant frequency and the Q0-factor of a TE011 mode cylindrical copper cavity with superconducting plates containing the sample under test. The measured var epsilonr of CaF2 was found to change from 6.484 to 6.505, and the tanδ from 3.1×10−6 to 22.7×10−6 when temperature was varied from 15 to 81 K. Due to the low losses CaF2 can be useful in construction of high Q-factor microwave circuits and devices operating at cryogenic temperatures.

Item ID: 801
Item Type: Article (Research - C1)
ISSN: 1873-619x
Keywords: dielectric materials; calcium fluoride; microwave properties
Date Deposited: 24 Oct 2006
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091201 Ceramics @ 100%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890199 Communication Networks and Services not elsewhere classified @ 80%
86 MANUFACTURING > 8616 Computer Hardware and Electronic Equipment > 861603 Integrated Circuits and Devices @ 20%
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