Investigation of the dispersion law of materials by means of multi-length TDR data

In this contribution a method for retrieving the dispersion law of a material under test (MUT) is proposed, based on TDR measurements. In particular, we propose a multilength approach for TDR measurements in reflection mode repeated at several frequencies. By replacing the multi - frequency measurements with measurements using multi-length TDR probe at each frequency, it is possible to retrieve the complex equivalent permittivity of the MUT in a band of interest. The algorithm has been validated vs. numerical full wave data simulated with the commercial code CST Microstudio.