Abstract
A dual-band non-destructive dielectric constant sensor based on the complementary split ring resonators is presented. The resonators for both bands use the complementary split ring structure of different sizes. Numerical simulation demonstrates that the resonating frequency and quality factor is dependent on the variation of dielectric constant and loss tangent, making it a potential structure for dielectric measurement. To search for the optimal thickness for measurement, parametric study is conducted and the retrieval expressions are obtained for both bands. The measured results indicate an accuracy of 1.5% in comparison with the data in the literature. In addition, the effect of air gap has been analyzed, showing that it is an important error source and eliminating such effect can improve the measurement accuracy.
Highlights
Dielectric constant is fundamental physical property for dielectric or insulating materials [1]
An improved circular complementary split ring resonator (CSRR) structure is reported in Ref. [19], where higher quality factor and sensitivity has been reached than the single slit CSRR structure
This paper investigated the feasibility of dual-band CSRR structure for dielectric constant measurement
Summary
Dielectric constant is fundamental physical property for dielectric or insulating materials [1]. One of the resonators is so called the complementary split ring resonator (CSRR) sensor It can measure the dielectric constant of a material with high sensitivity [18]. [19], where higher quality factor and sensitivity has been reached than the single slit CSRR structure These sensors, are still working in a single band. To extract the exact values of these components, full wave simulation using HFSS in couple with ADS simulation has to be conducted [26] After mounting the sample to the top of each CSRR resonator, the resonating frequency undergoes shift, and the quality factor will show variation with the loss tangent
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