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Sensors 2017, 17(8), 1712; doi:10.3390/s17081712

Analysis of the Optimum Gain of a High-Pass L-Matching Network for Rectennas

1
e-CAT Reaserch Group, Department of Electronic Engineering, Castelldefels School of Telecommunications and Aerospace Engineering, Universitat Politècnica de Catalunya, c/Esteve Terradas, 7, 08860 Castelldefels (Barcelona), Spain
2
CSC Research Group, Department of Signal Theory and Communications, Castelldefels School of Telecommunications and Aerospace Engineering, Universitat Politècnica de Catalunya, c/Esteve Terradas, 7, 08860 Castelldefels (Barcelona), Spain
*
Author to whom correspondence should be addressed.
Received: 8 April 2017 / Revised: 29 June 2017 / Accepted: 21 July 2017 / Published: 25 July 2017
(This article belongs to the Special Issue Autonomous Sensors)
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Abstract

Rectennas, which mainly consist of an antenna, matching network, and rectifier, are used to harvest radiofrequency energy in order to power tiny sensor nodes, e.g., the nodes of the Internet of Things. This paper demonstrates for the first time, the existence of an optimum voltage gain for high-pass L-matching networks used in rectennas by deriving an analytical expression. The optimum gain is that which leads to maximum power efficiency of the rectenna. Here, apart from the L-matching network, a Schottky single-diode rectifier was used for the rectenna, which was optimized at 868 MHz for a power range from −30 dBm to −10 dBm. As the theoretical expression depends on parameters not very well-known a priori, an accurate search of the optimum gain for each power level was performed via simulations. Experimental results show remarkable power efficiencies ranging from 16% at −30 dBm to 55% at −10 dBm, which are for almost all the tested power levels the highest published in the literature for similar designs. View Full-Text
Keywords: RF harvesting; rectenna; low-power management; L-matching network; optimum voltage gain; internet of things. RF harvesting; rectenna; low-power management; L-matching network; optimum voltage gain; internet of things.
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gasulla, M.; Jordana, J.; Robert, F.-J.; Berenguer, J. Analysis of the Optimum Gain of a High-Pass L-Matching Network for Rectennas. Sensors 2017, 17, 1712.

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