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<p>This paper presents the development of a split-ring resonator-based microwave sensor for dielectric constant measurement. The sensor is designed with a square split-ring resonator (SRR) on one side and a coplanar waveguide (CPW) transmission line on the other. The proposed sensor has a size of 35&#xa0;mm × 35&#xa0;mm × 1.27&#xa0;mm and a resonant frequency of 2.67&#xa0;GHz. The sensor is fabricated on an RO3210 substrate with a dielectric constant of 10.2 and a loss tangent of 0.003. The simulation and experimental results show a linear relationship between the resonant frequency shift and the dielectric constant of the test materials. Both results show a good coefficient of determination <i>R</i><sup>2</sup> which is above 0.98. Therefore, the dielectric constant of an unknown material can be determined using the inverse linear regression model. Three known substrate materials, Rogers RT6002, FR4, and Rogers TMM10 were used as test samples to validate the sensor performance. The measured dielectric constants for these three materials were 2.934, 4.323 and 9.531 respectively. The results have good agreement with the standard values provided in the data sheets, with errors of less than 4%.</p>

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Square Split-Ring Resonator-Based Microwave Sensor for Dielectric Constant Measurement

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Zi Xin Oh,
  • Kim Ho Yeap,
  • Zhi Lin Chong,
  • Nor Faiza Abd Rahman

摘要

This paper presents the development of a split-ring resonator-based microwave sensor for dielectric constant measurement. The sensor is designed with a square split-ring resonator (SRR) on one side and a coplanar waveguide (CPW) transmission line on the other. The proposed sensor has a size of 35 mm × 35 mm × 1.27 mm and a resonant frequency of 2.67 GHz. The sensor is fabricated on an RO3210 substrate with a dielectric constant of 10.2 and a loss tangent of 0.003. The simulation and experimental results show a linear relationship between the resonant frequency shift and the dielectric constant of the test materials. Both results show a good coefficient of determination R2 which is above 0.98. Therefore, the dielectric constant of an unknown material can be determined using the inverse linear regression model. Three known substrate materials, Rogers RT6002, FR4, and Rogers TMM10 were used as test samples to validate the sensor performance. The measured dielectric constants for these three materials were 2.934, 4.323 and 9.531 respectively. The results have good agreement with the standard values provided in the data sheets, with errors of less than 4%.