Theoretical derivation of a wireless sensor for accurate environmental perception

To address the limitations of traditional wired measurement methods and the low accuracy of existing wireless passive pressure measurement techniques based on limited data fitting, this study proposes an accurate environmental pressure perception method using a wireless passive sensor. The sensor consists of a rectangular cavity, a thin-plate top cover, and a rectangular sheet antenna with a microchip. Through theoretical derivation, the relationship between antenna strain, top cover deformation, and environmental pressure is established, and an accurate pressure calculation equation is derived. The experimental verification shows that the average relative error of the sensor is 0.3%, the maximum relative error is 0.8%, and it has good stability. The wireless passive sensing system avoids the drawbacks of wired measurement, such as heavy weight, space occupation, and difficult wiring in confined spaces or moving parts, providing a reliable solution for accurate environmental monitoring in aerospace and civil fields.