Design of Dual-Band Inverse Class-F Rectifier for Wireless Power Transfer and Energy Harvesting

• Published in: IEEE microwave and wireless technology letters (Print) Vol. 33; no. 3; pp. 355 - 358
• Main Authors: Nguyen, Dang-An, Bui, Gia Thang, Nam, Hyungseok, Seo, Chulhun
• Format: Journal Article
• Language: English
• Published: IEEE 01.03.2023
• Subjects: Energy harvesting; Energy harvesting (EH); Frequency measurement; Harmonic analysis; harmonic termination; Impedance; inverse class F (class F⁻¹) rectifier; Power system harmonics; Schottky diode; Schottky diodes; Voltage; wireless power transfer (WPT)
• ISSN: 2771-957X; 2771-9588
• DOI: 10.1109/LMWC.2022.3217459

This letter presents a novel methodology for designing high-efficiency dual-band (DB) inverse class F (class <inline-formula> <tex-math notation="LaTeX">\text {F}^{-1} </tex-math></inline-formula>) rectifier for wireless power transfer (WPT) and energy harvesting (EH). Specifically, a proposed DB class <inline-formula> <tex-math notation="LaTeX">\text {F}^{-1} </tex-math></inline-formula> harmonic termination network is employed based on transmission lines (TLINs) which are theoretically analyzed. The closed-form design formulas are derived for providing exact class <inline-formula> <tex-math notation="LaTeX">\text {F}^{-1} </tex-math></inline-formula> harmonic manipulation at two arbitrary frequency bands, enabling a highly efficient DB class <inline-formula> <tex-math notation="LaTeX">\text {F}^{-1} </tex-math></inline-formula> operation. For validation, a Schottky diode-based rectifier is implemented at two target frequencies of 1.9 and 2.45 GHz. The experimental results show that peak power conversion efficiency (PCE) can be achieved over 76% at 1.81 and 2.35 GHz with an input power of 13 dBm. Moreover, the rectifier exhibits a >50% PCE within a wide dynamic range (DR) of 19.5 and 17.5 dB at 1.81 and 2.35 GHz, respectively. To the author's best knowledge, this is the first time a DB diode-based rectifier design with the deployment of a DB harmonic termination mechanism is incorporated with a DB fundamental matching network.