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The energy harvesting system, which consists of a high-Q ferrite rod antenna and a high-efficiency rectifier, was developed to efficiently harvest power from AM broadcasting radio waves. The rectifier and its impedance matching to the antenna were optimally designed using a newly proposed simple equation-based rectifier model. The system was tested in the field and demonstrated excellent performance, harvesting 1.25 μW of DC power at a distance of 6.35 km from an AM radio station transmitting 500 kW of radio waves at 774 kHz.
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Kotani et al. (2024) studied this question.
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