Determination of complex permittivity and shielding parameters in microwave frequency range using resonance and transmission based techniques

Abstract

In the present work, microwave measurements have been carried out on natural rubber and with different concentration of expanded graphite in rubber matrix prepared using conventional melt mixing process. The transmission and resonance based techniques are employed to measure the dielectric parameters of composites using a Vector Network Analyzer (VNA). The detailed analysis of reflection loss/ absorption has been carried out with variation of frequency and the thickness of the samples. The transmission based technique in X-band frequency range has been used to extract the shielding parameters of the composite samples. The details of characterization techniques using VNA and the procedures for extracting dielectric and EMI shielding parameters are discussed.