Bulg. J. Phys. vol.45 no.3 (2018), pp. 264-274

Measurement of Uni- and Bi-Axial Dielectric Anisotropy of Crystalline Samples by Microwave Resonance Method

V. Levcheva, P. Dankov
Faculty of Physics, University of Sofia, 1164 Sofia, Bulgaria
Abstract. Two variants of resonance measurement methods have been described in the paper for characterization of uni- and bi-axial dielectric anisotropy of crystalline samples in the microwave range using cylindrical resonators. The dielectric parameters of several known and some new, unknown crystalline samples have been determined by a pair of cylindrical resonators for modes with excited electric fields in two mutually perpendicular directions (based on the authors' two-resonator method) or by a fixed-mode resonator with different orientations of the sample. The proposed methods include applying of 3D electromagnetic simulators as an auxiliary tool. The obtained results are presented in tabular and graphical form and are compared and discussed. Some conclusions have been drawn related to the measurement accuracy of the applied methods and to the reliability of the results obtained for the anisotropy of different crystalline samples.

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