Modified Hilbert Resonator-Based Transmission Line Sensor for Moisture Level Estimation of Soil

This article presents a highly sensitive modified Hilbert resonator (HR)-based transmission line sensor for moisture level estimation of soil. The HR sensor offers significant advantages over traditional moisture sensors, as it can remotely respond to different soil moisture levels and enables the detection of even small changes in moisture levels. The sensor’s sensitivity is quantified at 82 (MHz/pp), indicating its ability to detect moisture fluctuations in different soil samples. Experiments were conducted using three soil samples with varying moisture levels, from dry to 20%. The sensor exhibited measurable linear fluctuations in transmitted signals between 4.5 and 6 GHz for all soil samples. These findings demonstrate the sensor’s potential for improved soil management and agricultural practices, making it a promising tool for remote soil moisture-sensing applications. The results highlight the significance of the modified HR-based transmission line sensor in contributing to sustainable resource management and enhanced productivity across various domains.