Abstract
We present a microwave method for the dielectric characterization of small liquids based on a metamaterial-based sensor The proposed sensor consists of a micro-strip line and a double split-ring resonator (SRR). A large electric field is observed on the two splits of the double SRRs at the resonance frequency (1.9 GHz). The dielectric property data of the samples under test (SUTs) were obtained with two measurements. One is with the sensor loaded with the reference liquid (REF) and the other is with the sensor loaded with the SUTs. Additionally, the principle of extracting permittivity from measured changes of resonance characteristics changes of the sensor loaded with REF and SUTs is given. Some measurements were carried out at 1.9 GHz, and the calculated results of methanol–water mixtures with different molar fractions agree well with the time-domain reflectometry method. Moreover, the proposed sensor is compact and highly sensitive for use of sub-wavelength resonance. In comparison with literature data, relative errors are less than 3% for the real parts and 2% for the imaginary parts of complex permittivity.
Highlights
Materials can be divided into electric and magnetic media
The sensor has been designed by the micro-strip line technology
The complex permittivity of the samples under test (SUTs) can be obtained by two sensor is dramatically improved
Summary
Materials can be divided into electric and magnetic media. Dielectric materials are represented only using relative complex dielectric constant, while magnetic materials are denoted by relative complex dielectric constant and magnetic conductivity. A new type of microwave resonance device has been developed using artificial electromagnetic materials (meta-materials) [19,20,21]. Meta-material-inspired devices are employed ensure dielectric characterization of the SUT because of their compactness and high Q -factor. Several novel or modified microwave and terahertz sensors using meta-materials are being meta-materials are being presentedapplications, for various for measurement applications, for instance, presented for various measurement instance, thin-film and electrically smallthin-film sample and electrically small sample sensing, rotation, displacement, and strain sensing [22,23,24]. Satisfiesfor theminiaturization, demands for and be fabricated using PCBusing technology It satisfies theitdemands miniaturization, a compact size, a low cost, and high sensitivity in sensing applications.
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