Ambient RF Harvesting in Office Environment for IoT Sensor

Bachelor thesis (2018)

Authors

B.D. Meekes Electrical Engineering, Mathematics and Computer Science
V.J.F. Waegenaere Electrical Engineering, Mathematics and Computer Science

Contributors

G. de Graaf (supervisor 1)
M. Popov (supervisor 2)
Faruk Uysal (supervisor 2)
J.E.J. Schmitz (supervisor 2)
Faculty
Electrical Engineering, Mathematics and Computer Science
Copyright: © 2018 Bauke Meekes, Victor Waegenaere
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Published Date

02-07-2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

This report discusses one part of a project consisting of three parts. The goal of the project is to design a battery less sensor powered by RF energy fields present in an office environment. The sensor is able to measure the temperature and is able to communicate wirelessly using a low power communication protocol. In this project the use case of a building is explored. This thesis treats the RF energy harvesting part, which scavenges the RF power out of the ether and delivers it to the rectifier to convert and store the energy. First the spectrum has been analyzed to determine the most suitable frequency band. An antenna has been designed to harvest as much power at the chosen frequency. To make the power transfer from the antenna to the rectifier as efficient as possible, a matching circuit for matching the impedances is implemented. In this report, a Planar Inverted-F Antenna is designed to meet all the given requirements.