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Proceedings Paper

Impedance optimization of wireless electromagnetic energy harvesters for maximum output efficiency at µW input power
Author(s): Antwi Nimo; Dario Grgic; Leonhard M. Reindl
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Paper Abstract

This work presents the optimization of radio frequency (RF) to direct current (DC) circuits using Schottky diodes for remote wireless energy harvesting applications. Since different applications require different wireless RF to DC circuits, RF harvesters are presented for different applications. Analytical parameters influencing the sensitivity and efficiency of the circuits are presented. Results showed in this report are analytical, simulated and measured. The presented circuits operate around the frequency 434 MHz. The result of an L-matched RF to DC circuit operates at a maximum efficiency of 27 % at -35 dBm input. The result of a voltage multiplier achieves an open circuit voltage of 6 V at 0 dBm input. The result of a broadband circuit with a frequency band of 300 MHz, achieves an average efficiency of 5 % at -30 dBm and open circuit voltage of 47 mV. A high quality factor (Q) circuit is also realized with a PI network matching for narrow band applications.

Paper Details

Date Published: 27 March 2012
PDF: 14 pages
Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83410W (27 March 2012); doi: 10.1117/12.914778
Show Author Affiliations
Antwi Nimo, Albert-Ludwigs-Univ. of Freiburg (Germany)
Dario Grgic, Albert-Ludwigs-Univ. of Freiburg (Germany)
Leonhard M. Reindl, Albert-Ludwigs-Univ. of Freiburg (Germany)

Published in SPIE Proceedings Vol. 8341:
Active and Passive Smart Structures and Integrated Systems 2012
Henry A. Sodano, Editor(s)

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