Loss tangent measurements of dielectric substrates from 15K to 300K with two resonators: investigation into accuracy issues

Loss tangent of medium, low and very low loss dielectric substrates (including Rogers RT Duroid 5880 and 6010.2, LaAlO/sub 3/, LSAT, MgO and quartz) was measured at varying temperatures with two TE/sub 01/spl delta// dielectric resonators to ensure verification of the tests. Accuracy of the measurements has been investigated and discussed for a superconducting single post and a copper split post resonators in a temperature range from 15K to 300K.

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