Analysing the effect of conical coaxial probe angle in dielectric permittivity measurement

Homa Arab, Cevdet Akyel

Abstract

The aim of this paper is to study the effect of using different cone angles of a conical type coaxial probe in measuring dielectric properties of materials. Reflection coefficient,impedance and dielectric permittivity of six different angles of an open ended coaxial lines are studied. Using probes of sharper cone angles (sharper tips) allows for easier penetration into wide range of biological tissue types, which is an important feature in many biological applications. To demonstrate the accuracy of the numerical model, a parallel experimental study was carried out in the laboratory for the different cone angles. The results are compared and show excellent agreement. Moreover, the end results demonstrate that open-ended conical coaxial probes can be successfully used especially at low frequencies with the advantage of increased accuracy and sensitivity for sharper angles.

Keywords

Finite Element Method, Dielectric constant, Conical coaxial probe

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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