Focused microwave power transmission system with high-efficiency rectifying surface

被引：15

作者：

Dong, Yazhou ^{[1
,2
]}

Dong, Shi-Wei ^{[2
]}

Wang, Ying ^{[1
,2
]}

Liu, Shuo ^{[2
]}

Li, Xiaojun ^{[2
]}

Gao, Steven ^{[3
]}

Wei, Gao ^{[1
]}

Ran, Lixin ^{[4
]}

机构：

[1] Northwestern Polytech Univ, Sch Elect & Informat, Xian 710129, Shaanxi, Peoples R China

[2] China Acad Space Technol, Natl Key Lab Sci & Technol Space Microwave, Xian, Shaanxi, Peoples R China

[3] Univ Kent, Sch Engn & Digital Arts, Canterbury, Kent, England

[4] Zhejiang Univ, ARE, Hangzhou, Zhejiang, Peoples R China

来源：

IET MICROWAVES ANTENNAS & PROPAGATION | 2018年 / 12卷 / 05期

关键词：

microwave power transmission; transmitting antennas; rectennas; microwave antenna arrays; optimisation; matrix algebra; microwave metamaterials; metamaterial antennas; microwave power transmission system; high-efficiency rectifying surface; wireless power transmission systems; MPT system; circular polarisation; subwavelength resonant elements; focused transmitting array antenna; high beam collecting efficiency; partial scattering matrix optimisation; left-handed circularly polarised microwave power rectifying surface; output direct current power improvement; radiofrequency-to-DC conversion efficiency; RF-to-DC conversion efficiency; ANTENNA-ARRAY; SATELLITE;

D O I：

10.1049/iet-map.2017.0530

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A focused microwave power transmission (MPT) system with high-efficiency rectifying surface is proposed. This work has two main novel contributions: (i) most of wireless power transmission systems reported so far are non-focused. This study presents the first focused MPT system with circular polarisation; (ii) a novel high-efficiency rectifying surface using sub-wavelength resonant elements is developed. To design a focused transmitting array antenna with high power density at the receiving site and high beam collecting efficiency in the near field, a method based on the optimisation of a partial scattering matrix is employed. A left-handed circularly polarised microwave power rectifying surface consisting of 8x8 sub-wavelength resonant elements is designed and the measured conversion efficiency reaches 57.74%. To validate the concept, an experimental system including one focused transmitting array antenna and one 2x2 elements rectifying surface is implemented and measured, and the improvement of output direct current (DC) power and radiofrequency (RF)-to-DC conversion efficiency compared with non-focused condition is shown. The highest RF-to-DC efficiency of 66.5% is achieved in the focused mode, compared to that of 34.8% only in the non-focused mode as in traditional systems.

引用

页码：808 / 813

页数：6

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