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- W4386737266 abstract "An improved planar microwave sensor comprising a resistor-embedded top microstrip line and a ground-etched complementary split-ring resonator (CSRR), designed on a 1.6 mm Taconic substrate (εr=2.2), is presented to assess the quality of recycled cooking oils. The proposed resonant sensor exhibits an improved quality factor, and a reasonably larger shift in the resonant parameters under loading conditions, thereby facilitating the detection of even slight variations in electrical and chemical properties of low-loss dielectric samples. The enhanced performance of the proposed sensor is attributed to incorporating a specific valued lumped resistor on the top side of a microstrip line, which helps in coupling the maximum electric field to the CSRR and providing an extreme improvement in the S21 notch (-40 dB) near resonance. The proposed sensor is designed and simulated using the full wave simulator, the CST MWS. The equivalent circuit model is developed using the ADS to understand the behavior of the circuit in detail. An analytical formulation is implemented using MATLAB, which provides a definite relationship between the small value of the resistor connected on the top of the microstrip line, and the S <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>21</sub> value near resonance. Several fresh and recycled cooking oil samples are measured, and it is observed that their acid values get degraded from 1.5 to even 9.4 indicating the toxic nature of the recycled oils and their adverse effect on human health. The acid value of the oil samples in the present situation is obtained under a controlled chemical environment by developing an empirical relationship between this parameter and the normalized frequency and the S21 notch. The fabricated sensor provides a substantially higher value of fractional sensitivity (~25 MHz/mgKOHgm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-1</sup> ), and larger deviation in the S21 notch level (~ 3.33 dB/mgKOHgm <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-1</sup> ), for a unit change in the oil rancidity." @default.
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- W4386737266 date "2023-01-01" @default.
- W4386737266 modified "2023-10-12" @default.
- W4386737266 title "An Improved Microwave Sensor for Qualitative Assessment of Recycled Cooking Oils" @default.
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- W4386737266 doi "https://doi.org/10.1109/tim.2023.3315410" @default.
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