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We present a directed high-energy radio wave exposure detection sensor using radio frequency (RF) energy harvesting techniques. The sensor comprises a small dipole antenna and a tunable rectifier circuit. Reverse biasing the diode allows high levels of RF radiation to be detected by the sensor. We also demonstrate how the frequency-dependent nature of the rectifier can be alleviated. The proposed sensor performance is experimentally evaluated in the 5–10 GHz range.more » « lessFree, publicly-accessible full text available July 23, 2024