A broadband stripline technique for characterizing relative permittivity and permeability (article)

This is the author accepted manuscript. The final version is available from IEEE via the DOI in this record.The dataset associated with this article is located in ORE at: https://doi.org/10.24378/exe.503We present a stripline design and calibration method allowing the extraction of relative permittivity of single dielectric samples in the 200 MHz – 50 GHz range. The simultaneous extraction of relative permittivity and permeability is also illustrated by characterizing a set of samples comprising magnetic inclusions over the same frequency range. The calibration method involves the use of seven measurements of the stripline scattering parameters (S-parameters) with different length shorts inserted. From these measurements, it is possible to determine the reflections at the transition regions of the stripline to correct the measured S-parameters for characterization. By quantifying a range of samples with increasing percentage volume filling of barium titanate in polyurethane for the case of dielectric samples, and carbonyl iron powder (CIP) for magnetic samples, this work demonstrates a reliable method for the broadband characterization of composite materials.This work was supported by The Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom and The Defence Science and Technology Laboratory (DSTL) of The United Kingdom, via the EPSRC Center for Doctoral Training in Metamaterials (Grant No. EP/L015331/1