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Microwave properties of low-loss polymers at cryogenic temperatures

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4 Author(s)
Jacob, Mohan V. ; Dept. of Electr. & Comput. Eng., James Cook Univ. of North Queensland, Townsville, Qld., Australia ; Mazierska, J. ; Leong, K. ; Krupka, J.

Dielectric loss tangent and permittivity of polytetrafluoroethylene (Teflon), high-density (HD) polyethylene, and cross-linked polystyrene (Rexolite) were measured at temperature range from 28 to 84 K and frequency of approximately 18 GHz. The material properties were determined by measurements of the resonant frequency and the Q factor of a TE011 mode cylindrical superconducting cavity containing a sample under test. It has been demonstrated that these materials exhibit very low losses at cryogenic temperatures (2×10-6 for Teflon, 5×10-5 for HD polyethylene and 1.1×10-4 for Rexolite). Due to low losses, these materials can be useful in construction of various high-Q factor microwave devices for operation at cryogenic temperatures

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:50 ,  Issue: 2 )