Design of Dual-Band Inverse Class-F Rectifier for Wireless Power Transfer and Energy Harvesting
Dang‐An Nguyen, Gia Thang Bui, Hyungseok Nam, Chulhun Seo
Abstract
This letter presents a novel methodology for designing high-efficiency dual-band (DB) inverse class F (class <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <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 xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <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 xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <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 xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <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.