IMPROVEMENT OF THE PERMITTIVITY MEASUREMENT BY A 3D FULL-WAVE ANALYSIS OF A FINITE FLANGED COAXIAL PROBE.

Open-ended coaxial probes are commonly employed for the dielectric characterization of materials due to several well-known advantages. This measurement technique, consisting in measuring a relfection coefficient, Γ involves an inversion procedure: given the measured Γ the unkown complex permittivity, εM of the material under test (MUT) is computed by means of an electromagnetic (EM) model of the probe contacting the MUT. For this purpose, a mixed analytical/empirical/full-wave optimization to permittivity measurement is here proposed. The experimental results obtained by a 3D full-wave mode of the finite-flanged coaxial probe in the 2–3 GHz range, are discussed by comparing with those computed according to an analytical EM model involving an infinite flange [1]. Thee effect of the flange size on the permittivity measurement precision is also analyzed. [ABSTRACT FROM AUTHOR]