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Spoof Surface Plasmon based Coplanar Waveguide Sensor for Dielectric Sensing Applications
摘要： A highly confined spoof surface plasmon (SSP) based sensor to test the dielectric materials in microwave and terahertz (THz) frequency region is presented. The proposed sensor comprised of the main coplanar waveguide (CPW) line and the defected T-shaped SSP line at the top and bottom of the substrate, respectively. The defect in the SSP line provides stop band, and hence localization of the transmission energy at the defect location. The resonance frequency and localization of the transmission energy can primarily be tuned by varying the height of the defect and the periodicity of the SSP strip. The proposed sensor is numerically optimized and tested in the microwave and THz frequency region using the full wave electromagnetic solver (CST-MWS). The designed sensor conforms the planar geometry, which facilitates its ease of integration to the modern radio frequency (RF) and THz frequency systems. The sensor prototype is fabricated and experimentally tested in the microwave frequency region using a number of standard solid and liquid samples. It is found that the test samples with closely spaced dielectric constant can easily be distinguished using the developed SSP sensor owing to its considerably high quality factor (~165) and hence high resolution. Additionally, the fabricated compact sensor prototype has adequate sensitivity (2.84%) and small sensing area, as a result it helps to test small volume of liquid specimen (order of few microliter), which is generally the case with the biological samples due to their low volume availability.
关键词： dielectric sensing,surface plasmons,coplanar waveguide,quality factor
更新于2025-09-11 14:15:04
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Lorentz Reflect-Phase Detector for Moisture and Dielectric Sensing
摘要： We experimentally investigate a new class of resonant dielectric sensors that are based on reflectance phase measurement in the Lorentzian dispersion regime. The Lorentzian dispersion, also known as anomalous dispersion, is characterized by a strong wave absorption accompanied by a double reversal of the phase (flip-flop phase). Since the Kramer-Kronig relation holds, a phase-slope measurement is enough to completely characterize a dielectric material at in the narrowband microwave spectrum. Due to strong dispersion, the Lorentz sensors are noise immune and are less affected by external circuit changes. Therefore, they can be potentially applied in hostile environments such as high temperature furnaces. The proposed detection method is inspired from the optical measurement technique known as spectroscopic ellipsometry. We apply the anomalous phase detection to estimate dielectric and moisture changes.
关键词： dielectric sensing,microstrip resonators,anomalous dispersion,Lorentzian dispersion,resonant sensors,noise immunity
更新于2025-09-09 09:28:46