Experimental Demonstration of Coexistence of Microwave Wireless Communication and Power Transfer Technologies for Battery-Free Sensor Network Systems

Satoshi Yoshida,Yuta Kobayashi,Takumasa Noji,Shigeo Kawasaki,Goh Fukuda

doi:10.1155/2013/357418

Abstract

This paper describes experimental demonstrations of a wireless power transfer system equipped with a microwave band communication function. Battery charging using the system is described to evaluate the possibility of the coexistence of both wireless power transfer and communication functions in the C-band. A battery-free wireless sensor network system is demonstrated, and a high-power rectifier for the system is also designed and evaluated in the S-band. We have confirmed that microwave wireless power transfer can coexist with communication function.

Highlights

Most electrical devices are powered by wires, but wired connections limit the mobility of portable devices and the payloads of cars and spacecraft
We have proposed the wireless information/communication and power transmission (WiCoPT) and wireless sensor and energy transfer (WiSEnT) technologies and provided experimental demonstrations of the feasibility for the coexistence of wireless power transfer (WPT) and communication in a batteryfree wireless sensor network system. 5.80 GHz GaAs high-electron-mobility transistor (HEMT) rectifiers with a 20 MHz band-pass filter (BPF) were designed and evaluated for WiCoPT technology
The fabricated rectifier was used for a WiCoPT demonstration. 400 mW output power was obtained and 1 MSPS quadrature phase shift keying (QPSK) communication with 11.5% error vector magnitude (EVM) was conducted

Summary

Introduction

Most electrical devices are powered by wires, but wired connections limit the mobility of portable devices and the payloads of cars and spacecraft. There are three wireless power transfer (WPT) categories: electromagnetic coupling type [1, 2], magnetic resonance type [3, 4], and microwave radiation type [5, 6]. Coupling- and resonant-type WPT devices using MHz frequencies have been reported [7, 8], but such devices are not suitable for high-speed signal and command transfer or cannot transfer energy over distances of several meters. Microwave WPT shows more promise, since the microwave band is commonly used in applications such as wireless local area network and cellular network systems. WPT-based microwave bands can transfer both energy and command signals over long distances

Methods

Results

Conclusion