Open AccessRectifying surface with optimal RF‐to‐DC efficiency insensitive to polarisation collimation
Author(s) -
Li Ran,
Chen Zheda,
Huangfu Jiangtao,
Ran Lixin,
Ye Dexin
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.0195
Subject(s) - energy conversion efficiency , collimated light , optics , physics , impedance matching , electrical impedance , optoelectronics , range (aeronautics) , materials science , computer science , laser , quantum mechanics , composite material
A rectifying surface for energy harvesting with optimal RF‐to‐DC efficiency insensitive to polarisation collimation is presented based on metasurface and branch‐line coupler. The metasurface captures two orthogonal components of incident wave by two separate loads with high efficiency. A 90° branch‐line coupler is introduced to redistribute two polarisation‐dependent components into two invariant equipower outputs, aiming to preserve continuous impedance‐matching between metasurface and rectifiers for maximised conversion efficiency. The proposed rectifying surface has been fabricated and measured. The measured fluctuation ranges of capture and conversion efficiency are smaller than 2 and 0.5%, respectively, agreeing well with authors’ prediction. They expect a wide range of applications to emerge from this novel concept in the future.