Title :
Microwave properties of low-loss polymers at cryogenic temperatures
Author :
Jacob, Mohan V. ; Mazierska, Janina ; Leong, Kenneth ; Krupka, Jerzy
Author_Institution :
Dept. of Electr. & Comput. Eng., James Cook Univ. of North Queensland, Townsville, Qld., Australia
fDate :
2/1/2002 12:00:00 AM
Abstract :
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
Keywords :
Q-factor; cryogenics; dielectric losses; dielectric materials; microwave materials; permittivity; polymers; 18 GHz; 28 to 84 K; Q-factor; Rexolite; Teflon; cross-linked polystyrene; cryogenic temperature; cylindrical superconducting cavity; dielectric loss tangent; high-density polyethylene; microwave properties; permittivity; polymer; polytetrafuoroethylene; resonant frequency; Cryogenics; Dielectric loss measurement; Dielectric measurements; Frequency measurement; High definition video; Permittivity measurement; Polyethylene; Polymers; Superconducting materials; Temperature measurement;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
