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Extended cavity perturbation technique to determine the complex permittivity of dielectric materials

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3 Author(s)
Meng, Binshen ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Booske, J. ; Cooper, Reid

An improved measurement technique to determine the complex dielectric properties of materials has been developed that extends the validity of the conventional cavity perturbation technique for circular cylindrical rod-shaped samples in circular cylindrical cavities resonating in TM0n0 modes. The method is particularly useful for the dielectric characterization of fragile, low-loss materials that are difficult to machine to typically required thin dimensions. The method further allows for multi-frequency measurements using higher-order radial modes and somewhat alleviates the very small cavity dimensions typically required by the conventional perturbation technique at higher microwave frequencies. A validity criterion for the extended method is given. Measurements of the complex permittivity of NaCl single crystals are presented, showing excellent agreement with theory

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:43 ,  Issue: 11 )

Date of Publication:

Nov 1995

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