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Dielectric Measurements on Polymeric Materials by Using Superconducting Microwave Resonators

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This paper deals with the theoretical and practical investigation of a test method using superconducting cavity and helical resonators in an oscillator loop, which aIIows precision measurements to be performed on solid dielectrics in the range of 0.1-10 GHz, and below 9 K. The underlying formulas are an extension of the well-known perturbation formalism and are not restricted to low temperatures. Our experiments resulted in unloaded quality factors of Q = 5˙ 107, between 0.2 and 10 GHz, with a maximum Q (2.2 K, 0.19 GHz) of 9˙ 108, which enabled us to observe the smallest loss tangent so far: tan delta (2.2 K, 6.5 GHz) = (3.7 ± 5 percent)˙ 10-7 in polyethylene.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:25 ,  Issue: 12 )