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Sub-6 GHz Microwave Sensor Targeting Microplastic Detection
Summary
Researchers designed an enhanced sub-6 GHz microwave sensor for low-cost microplastic detection by modifying sensor geometry to better utilize the bandwidth of portable microwave vector network analyzers. Electromagnetic simulations and experimental measurements validated the redesigned sensor, which calibrates resonant frequency as a function of effective permittivity to quantify microplastic concentrations in water.
This paper presents the design of an enhanced microwave sensor for low-cost microplastic detection, offering improved sensitivity within the 6 GHz frequency range. This was achieved by modifying the geometry of a previously published sensor, to fully utilize the bandwidth of new portable Microwave Vector Network Analyzers. Electromagnetic simulations and experimental measurements were conducted to validate the redesigned structure. Furthermore, a dielectric sample was used to simulate the presence of microplastics in water, enabling the calibration of the sensor's resonant frequency as a function of the medium's effective permittivity. Based on electromagnetic simulation results, the sensor would be able to detect concentrations as low as 25 ppm of microplastic dissolved in water. The results demonstrate that the redesigned sensor achieves reliable performance while maintaining low manufacturing cost, making it suitable for in situ environmental monitoring applications.
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