Study of Metamaterial on Efficiency of DGS-based MISO-WPT system

In this paper, we propose a multiple-input single-output (MISO) wireless power transfer (WPT) system using a stacked meta-surface structure for achieving a high transmission distance. We started by studying two coupled DGS resonators one is a transmitter and the other is a receiver, each resonator is excited by a microstrip line to transfer power at a frequency of 670 MHz. In order to improve the power transfer efficiency, five extra DGS transmitters are employed. Therefore, the proposed multiple-input transmitter is composed of six DGS resonators printed on one layer of a single substrate. On the other side, the receiver is a single DGS resonator. The size of the transmitter and receiver are 46.4mm $\times 30.7$ mm and 15mm $\times 15$ mm, respectively. The stacked meta-surface is in three layers. And the size of it is 25.4mm $\times 25$ mm. In measurement, the WPT efficiency of the MISO system with meta-surface is a maximum of 31.1% higher than that of the MISO system without meta-surface.

I. Introduction

Wireless power transfer (WPT) has nowadays become essential in lots of fields, such as implantable medical devices [1], [2]. Internet of things (IoT) applications [3], and consumer electronics [4]. A conventional single-input single-output (SISO) system has some limitations such as limited transmission distance or low WPT efficiency. Also, when it comes to data transmission, a multi-input-single-output (MISO) system always performs better than the SISO one [5]. Moreover, the use of the MISO system can obtain a higher WPT efficiency than the SISO one [6].