Microwave Wireless Power Transmission Inside a Closed Cavity Based on Novel Frequency Controlling

JING Xiao-wei; JING Jian-wei; YAN Li-ping; LIU Chang-jun

doi:10.12263/DZXB.20230932

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ACTA ELECTRONICA SINICA ›› 2024, Vol. 52 ›› Issue (7) : 2257-2261. DOI: 10.12263/DZXB.20230932

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Microwave Wireless Power Transmission Inside a Closed Cavity Based on Novel Frequency Controlling

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Abstract

With the rapid development of aerospace technology, wireless power transmission (WPT) in the closed cavity has attracted extensive attention.WPT based on frequency control is proposed, which can realize controllable, and high-efficiency wireless charging of multi-directional sensors in electrically large closed cavities (10³× $λ$ ³).The electric field distribution in an electrically large cavity is very sensitive to the change of frequency, and the field distribution in the closed cavity can be controlled by changing frequency.The experimental results show that the highest WPT efficiency at S-band is 96.6%. The measured rectification efficiency of the designed broadband rectifier circuit is up to 80%, and the bandwidth with rectification efficiency higher than 50% is 1.65 GHz.The different working states of dual receivers can be controlled in the frequency band from 2.401~2.495 GHz, which shows its application prospect in wireless power supply for sensors in closed spaces such as aerospace vehicles.

Key words

closed electrically large cavity / frequency control / high efficiency / S-band / microwave wireless power transmission / rectifying circuit

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JING Xiao-wei , JING Jian-wei , YAN Li-ping , LIU Chang-jun. Microwave Wireless Power Transmission Inside a Closed Cavity Based on Novel Frequency Controlling[J]. Acta Electronica Sinica, 2024, 52(7): 2257-2261. https://doi.org/10.12263/DZXB.20230932

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