Calibration method for lumped capacitance measurement of complex

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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324 61R, 324 74, 324130, G01R 2726, G01R 138, G01R 3500

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active

042465346

ABSTRACT:
A rapid and accurate method for calibrating an instrument for measuring the reflection coefficient and complex permittivity of unknown dielectric materials in a lumped capacitance method for an automatic network analyzer is described. The method includes the discovery that the capacitance of the instrument filled with air can be calculated by measuring only the reflection coefficients of the instrument filled with air and filled with a standard liquid of known permittivity, without the necessity of calculating the capacitance value from the dimensions of the instrument. The complex permittivity of the unknown can then be calculated by measuring the reflection coefficient of the instrument filled with the unknown dielectric. Complex permittivity measurements are useful in, for example, evaluating the time course of dielectric dispersions in biological samples.

REFERENCES:
Hyde, P. J., "Wide Frequency Range . . . ;" Proc. of the IEE; vol. 117, No. ; Sep. 1970; pp. 1891-1901.
Hewlett-Packard Catalog; 1970; pp. 386-388; Hewlett-Packard Co., Palo Alto, Calif.

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