Abstract:
Precision agriculture systems enabled by passive, wireless, subsurface soil sensors can provide high resolution data on soil conditions and increase crop yield. These frequency-coded sensor nodes are composed of an antenna, acoustic resonator and capacitive soil moisture sensor. Here, a high performance Al 0.7 Sc 0.3 N Lamb-wave resonator (LWR) for operation in the 902-928 MHz industrial, scientific, medical (ISM) band is fabricated. Its figure of merit is 37% larger than state-of-the-art LWR at similar frequency. The LWR is integrated with a capacitive moisture sensor and its frequency tuning capabilities are demonstrated. A sensitivity of 65 kHz at interrogation ranges of up to 150 m is determined.
Published in: 2023 IEEE/MTT-S International Microwave Symposium – IMS 2023
