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Dual-Band Defected Ground Structure Resonators Wireless Power Transfer System Connected to Voltage-Doubler Circuit

Recently, research on multiband wireless power transfer (WPT) systems has drawn attention high efficiency in the air with a small package of WPT size for the possible bio-related application. However, the WPT system itself is not complete without complementary circuit to convert the received RF power to DC. Thus, this paper presents a design method of integrating a predesigned dual-band WPT system to a voltage-doubler (VD) without external circuit configuration. The method proved to be working as experiment RF-DC conversion efficiency recorded to be 35.2% and 37.9% in both bands, respectively with 20 mm working distance through skin, −1.27% and −1.6% dropped from air condition.