Relative Permittivity Measurement of 3D-textile

Abstract

The paper deals with the relative permittivity determination of the 3D-textile by a transmission line method (TLM). Measuring points are shifted to avoid inaccuracies caused by transitions between a coaxial cable and a microstrip line. A substrate where the microstrip line is designed is composed of three layers where one layer (3D-textile) has unknown permittivity. The relative permittivity of the 3D-textile is calculated from effective permittivity by a conformal mapping method.