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This letter presents a high-power resonant inverter using an enhancement mode gallium nitride (eGaN) device with magnetic resonant coupling (MRC) coils at 13.56 MHz for wireless power transfer (WPT). The power inverter driving the transmitting coils is based on a class $\Phi _2$ inverter, a single-switch topology with low switch-voltage stress, and fast transient response. The implementation utilizes...