Nondestructive complex permittivity measurement of conducting materials using open-ended coaxial probes

Abstract

In regard to their physical properties, intrinsically conducting polymers are very good candidates for electronic applications. In this paper, we present the open-ended coaxial method to measure the complex permittivities of Polyaniline/Polyurethane conducting composites at nearly percolation threshold in microwave band. At the microwave frequencies, the permittivities follow the power law (e proportional to f-s) in agreement with the hopping theory. For blends with 1% of Pani, the loss factor (tan S) had interesting value (tan S = 3.2 at IGHz) for using as microwave absorbing materials. ©2006 IEEE.