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Wireless power transfer (WPT) working at several megahertz (MHz), 6.78 or 13.56 MHz, is widely considered to be a promising candidate for charging electronic devices. The so-called Class $E^2$ converters combining the soft-switching-based Class $E$ power amplifier (PA) and Class $E$ rectifier are known to be suitable for high-frequency applications with improved efficiency. However, the charging...
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