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A Multiconductor Probe for Broadband Dielectric-Spectrum Measurements

We present a new probe design for broadband dielectric spectrum measurements of powdery and granular materials. Our probe is based on a multiconductor transmission line consisting of a signal conductor surrounded by multiple ground conductors. We present approximate design equations for such a multiconductor structure and perform electromagnetic simulations in order to verify performance of our probe. These simulations mimic a calibration procedure of a probe and also measurements of PTFE, isopropanol, and methanol. Based on those simulated measurements we further extract the dielectric spectrum of the materials under test. Our analysis shows that at least eight ground conductors are required for an accurate measurement in the 0.2−3 GHz frequency range.