Potato Battery

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IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS, VOL. 2, NO. 1, MARCH 2012

Design Optimization and Implementation for RF Energy Harvesting Circuits
Prusayon Nintanavongsa, Student Member, IEEE, Ufuk Muncuk, David Richard Lewis, and
Kaushik Roy Chowdhury, Member, IEEE

Abstract—A new design for an energy harvesting device is proposed in this paper, which enables scavenging energy from radiofrequency (RF) electromagnetic waves. Compared to common alternative energy sources like solar and wind, RF harvesting has the least energy density. The existing state-of-the-art solutions are effective only over narrow frequency ranges, are limited in efficiency response, and require higher levels of input power. This paper has
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However, given the recent advances in energy efficiency for the circuit components of a sensor (say, diodes that require less forward voltage threshold), and the low-power operation modes supported by the device itself (say, sleep mode consuming only millivolt), there is a visible need for revisiting energy harvesting circuit design that can successfully operate a sensor node.
Fig. 1 shows the components of our proposed energy harvesting circuit. The incident RF power is converted into dc power by the voltage multiplier. The matching network, composed of inductive and capacitive elements, ensures the maximum power delivery from antenna to voltage multiplier.
The energy storage ensures smooth power delivery to the load, and as a reserve for durations when external energy is unavailable. Such a design needs to be carefully crafted: increasing the number of multiplier stages gives higher voltage at the load, and yet reduces the current through the final load branch. This may result in unacceptable charging delays for the energy storage capacitor. Conversely, fewer stages of the multiplier will ensure

2156-3357/$31.00 © 2012 IEEE

NINTANAVONGSA et al.: DESIGN OPTIMIZATION AND IMPLEMENTATION FOR RF ENERGY HARVESTING CIRCUITS

quick charging of the capacitor, but the voltage

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