volume | PIER Journals

Abstract

Accurate characterization of magnetodielectric materials is required for the development of microwave sensors and high-frequency communication systems. This study proposes a compact planar microwave sensor that uses a single dual-Split-Ring Resonator (SRR) to simultaneously measure permittivity and permeability. The core innovation lies in the spatial segregation of electric-field-dominant and magnetic-field-dominant sensing regions within a unified resonator framework, which effectively suppresses the mutual interference between the dielectric and magnetic sensing channels. Designed to resonate at 4.15 GHz, the sensor's performance was evaluated through full-wave electromagnetic simulations and experimental validation using six different materials under test (MUT) (including Magtrex555 and various Rogers's substrates). Sixty independent measurements were conducted to ensure reliability. The experimental results demonstrate high sensitivity, with 144.2 MHz/ε_r for permittivity and 45.4 MHz/μ_r for permeability. The proposed sensor enables characterization across a measured permittivity range of 2.2-6.5 and a permeability range of 1-6, demonstrating its capability to evaluate both dielectric and magnetic properties within the specified measurement domain. The proposed sensor achieved average characterization accuracies of 96.93% and 98.81% for permittivity and permeability, respectively, with minimum errors as low as 0.03%. These results confirm that dual-SRR architecture provides a robust, repeatable, and non-destructive solution for magnetodielectric material characterization with a highly compact form factor.

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Dr. Yusnita Rahayu

Dr. Evelyn Davina Amanda

Dr. Yohanes Galih Adhiyoga