Compact Design of Highly-Efficient Dual-Band Voltage Doubler Rectifier by Using Second-Harmonics Suppression for Wireless Power Transfer

This paper proposes compact design for high-efficiency voltage doubler rectifier with dual-band operation based on second-harmonics suppression. The proposed structure consists of two main parts: dual-second harmonic suppression and dual-band fundamental matching. The novelty of the proposed structure compared to published rectifiers is that both parts are optimized in design when only two transmission lines are employed for each part. Furthermore, the design process of the proposed structure was clearly presented in this paper through equations derived from transmission line theory, and this methodology is validated by a topology implemented at two frequencies of 2.45 GHz and 5.8 GHz. The measurement results of the fabricated voltage doubler rectifier show that the peak PCEs are relatively high (over 79% at 2.55 GHz and over 70% at 5.55 GHz) while the size is the most compact (only 20mm x 27mm) in comparison with published works.