Simplified Dielectric Property Determination for Wearable Applications Using Dual CPW Lines

This paper presents an enhanced dual transmission-line method for evaluating the dielectric properties of known and unknown materials, significantly improving upon traditional techniques. The proposed method simplifies the experimental setup by eliminating the need for constructing transmission lines or additional processing on unknown materials, utilizing a straightforward simulation model created with the EM simulator CST and requiring only low-cost experimental equipment. It operates independently of prior knowledge concerning the substrate dielectric constant, streamlining data processing and saving time. Furthermore, the method demonstrates high accuracy in comparison to reference values. Applied in this study, it verified the dielectric properties of unknown cowhide leather and two commercial substrates, RO3010 and RT5880. The computed root-mean-square errors (RMSEs) were 24.1% for RT5880 and 3% for RO3010, confirming the method's effectiveness. Overall, this improved approach provides a reliable and efficient alternative for material characterization in dielectric property determination.