Nondestructive measurement of EM-parameters of high-loss materials by two-probes-method

As a non-destructive measurement technique, flanged-open-ended-coaxial-probe-based measurement technique has been attracting a lot of interests in the simultaneous measurement of the complex EM-parameters (i.e. complex permittivity and permeability) of high loss materials. Since at least two complex reflection coefficients under different experimental setting must be obtained to extract two complex parameters simultaneously, in this paper, we proposes a new method, named “Two-Probes-Method”. Two reflections are obtained by using two different coaxial probes. The broadband frequency-swept measurements/simulations are then conducted on two absorbing materials using APC-7 and 3.5mm coaxial probes. The experimental results agree with the reference data, which validates the feasibility and effectiveness of this proposed technique. It should be noted that the proposed method is applicable for in-situ/nondestructive measurements.