Wideband rectifying metasurface with enhanced efficiency for wireless power transmission via harmonic feedback design.

IF 3.2 2区物理与天体物理 Q2 OPTICS

Optics express Pub Date : 2025-01-27 DOI:10.1364/OE.550134

Huaiqing Liu, Kaisheng Zhu, Changzhou Hua, Taijun Liu, Maosheng Fu, Shuomin Zhong

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引用次数: 0

Abstract

We present a wideband rectifying metasurface (RMS) with enhanced system efficiency for wireless power transmission and energy harvesting. The RMS consists of periodic arrays with integrated diodes, with a high input impedance matched with the diodes, thus eliminating the matching network between metasurface (MS) and rectifier. Besides, a unique harmonic feedback network is embedded in each unit cell, rectifying the high-order harmonic generated by the diode repeatedly, improving the total efficiency over a wide bandwidth. The converted DC power is channeled to one single load through the DC-paths formed by the branches of MS and a series of inductors, avoiding additional DC-combination networks. The MS can effectively capture EM energy at an operating band of 2-3.5 GHz, and the simulated radiation-AC efficiency is up to 99% at 2.8 GHz. A finite 8 × 8 array is fabricated and measured. The total conversion efficiency reaches a peak value of 60.5% at 2.7 GHz when the power density is 25dBm/m², and is greater than 40% from 2.3 GHz to 2.9 GHz, exhibiting a wide bandwidth of 23.1% compared with existing state-of-the-art studies. The integrated MS-based RF energy harvester with the advantages of a simple structure is of great significance for wireless power transfer and energy harvesting applications.

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我们提出了一种宽带整流超表面（RMS），提高了系统效率，用于无线电力传输和能量收集。RMS由集成二极管的周期阵列组成，具有与二极管匹配的高输入阻抗，从而消除了超表面（MS）与整流器之间的匹配网络。此外，在每个单元格中嵌入独特的谐波反馈网络，对二极管产生的高次谐波进行反复整流，提高了宽带宽下的总效率。转换后的直流功率通过由MS支路和一系列电感器形成的直流路径输送到单个负载，避免了额外的直流组合网络。在2 ~ 3.5 GHz工作频段，MS能有效捕获电磁能量，在2.8 GHz工作频段，模拟辐射交流效率高达99%。制作并测量了一个有限的8 × 8阵列。当功率密度为25dBm/m2时，总转换效率在2.7 GHz时达到峰值60.5%，在2.3 GHz至2.9 GHz范围内提高40%以上，与现有研究相比，带宽达到23.1%。基于ms的集成化射频能量采集器具有结构简单的优点，对无线能量传输和能量收集应用具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics express 物理-光学

CiteScore

6.60

自引率

15.80%

发文量

5182

审稿时长

2.1 months

期刊介绍： Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.