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—This letter presents a low-cost knight's helm shape double-sided printed circuit board (PCB) antenna of size 3 cm 3 cm for ultra-wideband (UWB) application. The antenna has a return loss of more than 10 dB, constant group delay and gain flatness over the frequency range set by the Federal Communications Commission (FCC) for UWB application. Satisfactory(More)
—Wireless power transfer is demonstrated mathematically and experimentally for M primary coils coupled to N secondary coils. Using multiple primary coils in parallel has advantages over a single primary coil. First, the reduced inductance of the transmitting coils makes the amplifier less sensitive to component variations. Second, with multiple receiving(More)
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