Liquid and Solid Material Sensing Using Metamaterial
Mohammad Tariqul Islam, Md. Rashedul Islam · 2023
In this chapter, metamaterial sensors with high sensitivities and quality factors are designed for microwave sensing applications since metamaterials have received significant attention and have potential for the construction of high-sensitivity sensors. The advantage of employing metamaterial sensors is that they can be utilized to construct passive wireless sensors as microwave devices, as opposed to existing technology, which requires accompanying circuitry to measure and transmit data. The study focuses on not only the metamaterial structure design, which creates exceptional properties, but also on the desire for high sensitivity, compact size, good transmission notches, correct field enhancement, and a better effective medium ratio. The tri circle split ring resonator shaped metamaterial sensor shows a better performance with a significant sensitivity of -83 dB (mg/L), and a 170 MHz resonance frequency shift between clean and waste engine oils. The effective medium ratio, quality factor and sensitivity of the compact SRR shaped metamaterial sensor are 13.54, 325, 12.03% for a permittivity change of 0.092; an 11.53% change for a MUT thickness change of 0.5 mm is also observed. The developed sensor can be used to distinguish various materials (liquids, solids) and their thickness using the microwave frequency.