A polarization‐insensitive metamaterial absorber for moisture‐sensing applications of agriculture products

Abstract

This study evaluates the metamaterial absorbance and sensing applications of a novel wheel‐shaped resonator with triangular spokes. Electromagnetic simulation software, CST Microwave Studio, is used to investigate the numerical results before experimental verification. The proposed absorber exhibits perfect absorption properties at 10.42 GHz, with an absorbability of 99.85%. The designed sensor has been tested for estimating the moisture content of agricultural products, specifically almond kernels. The proposed prototype exhibits an excellent figure of merit and high sensitivity of 58.14 and 11.29 GHz/moisture content percentage, respectively. Additionally, the resonant peak of the sensor shifts by approximately 430 MHz when there is a 4% incremental alteration in the moisture content of the analyzed test sample. The designed sensor shows a high linearity in detecting small variations in moisture level, making it a favorable choice for sensing applications due to its compact size and flat shape.

Microstrip and Metamaterial Embedded Patch Antenna Sensors for Determination of Moisture in Rice, Wheat, and Pulse Grains

“…[12][13][14][15][16][17][18][19][20][21] A large number of researchers in this field are becoming interested in metamaterials due to their exceptional electrical and magnetic properties, which have a variety of applications including absorption, sensing, polarization rotation, perfect lenses, source shifting and imaging, etc. [22][23][24][25][26][27] These sensors have certain unique qualities, including a simple design, ease of fabrication, low cost, high-quality factor and sensitivity, and reliability. Metamaterial absorbers, with minor structural changes, have the potential to sense temperature, pressure, and humidity, identify substances and their electrical properties like permittivity, sense gases, and biomolecules, and assess the quality of agricultural products.…”