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A multi-step approach for accurate permittivity measurements of liquids using a transmission line method

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3 Author(s)
Zhao, D. ; Dutch Metrol. Inst., VSL, Delft, Netherlands ; Rietveld, G. ; Teunisse, G.M.

High-precision permittivity measurements of liquids are essential for specifying the specific absorption rate (SAR) of radio frequency power into human tissue. At VSL, a commercial unit is used for these measurements, but for reaching a low uncertainly some inherent disadvantages need to be overcome. In this paper, a multi-step approach is proposed using a combination of curve fitting, nonlinear progressive technique and an improved transmission line model. This approach is applicable even without a priori knowledge of the liquid properties. Using this approach, the applicable frequency range of the commercial unit is successfully extended from 200 MHz 3 GHz to at least 100 MHz-4 GHz, and the accuracy is improved from 2 % to 0.2 % 0.3 %.

Published in:

Precision Electromagnetic Measurements (CPEM), 2010 Conference on

Date of Conference:

13-18 June 2010