Conductivity Measurement of E-textiles using a Microstrip Ring Resonator

A conductivity measurement technique applicable for highly conductive textile materials is
presented in this work. We employ a microstrip ring resonator as a test fixture to ease sample
preparation and to increase measurement sensitivity. With this, the conductivity of a thin textile can be measured up to 106 S/m at 2 GHz. The conductivity value is extracted by comparing the measured and simulated transmission coefficients in an active learning iterative solver based on the surrogate-based optimization. The conductive textiles under test were Zelt and silver-coated e-textile, and the resulted conductivities are 2.29x105 and 3.47x105 S/m, respectively. These values are close to the DC conductivity given by the manufacturers.