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Open AccessArticle

A Compact Thévenin Model for a Rectenna and Its Application to an RF Harvester with MPPT

1
e-CAT Research 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
Idneo Technologies, c/ Rec de Dalt s/n., 08100 Mollet del Vallès (Barcelona), Spain
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(7), 1641; https://doi.org/10.3390/s19071641
Received: 28 March 2019 / Accepted: 3 April 2019 / Published: 6 April 2019
(This article belongs to the Special Issue Eurosensors 2018 Selected Papers)
This paper proposes a compact Thévenin model for a rectenna. This model is then applied to design a high-efficiency radio frequency harvester with a maximum power point tracker (MPPT). The rectenna under study consists of an L-matching network and a half-wave rectifier. The derived model is simpler and more compact than those suggested so far in the literature and includes explicit expressions of the Thévenin voltage (Voc) and resistance and of the power efficiency related with the parameters of the rectenna. The rectenna was implemented and characterized from −30 to −10 dBm at 808 MHz. Experimental results agree with the proposed model, showing a linear current–voltage relationship as well as a maximum efficiency at Voc/2, in particular 60% at −10 dBm, which is a remarkable value. An MPPT was also used at the rectenna output in order to automatically work at the maximum efficiency point, with an overall efficiency near 50% at −10 dBm. Further tests were performed using a nearby transmitting antenna for powering a sensor node with a power consumption of 4.2 µW. View Full-Text
Keywords: RF harvesting; rectenna; Thévenin model; maximum power point tracking; MPPT; L-matching network; sensor node RF harvesting; rectenna; Thévenin model; maximum power point tracking; MPPT; L-matching network; sensor node
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MDPI and ACS Style

Gasulla, M.; Ripoll-Vercellone, E.; Reverter, F. A Compact Thévenin Model for a Rectenna and Its Application to an RF Harvester with MPPT. Sensors 2019, 19, 1641. https://doi.org/10.3390/s19071641

AMA Style

Gasulla M, Ripoll-Vercellone E, Reverter F. A Compact Thévenin Model for a Rectenna and Its Application to an RF Harvester with MPPT. Sensors. 2019; 19(7):1641. https://doi.org/10.3390/s19071641

Chicago/Turabian Style

Gasulla, Manel; Ripoll-Vercellone, Edgar; Reverter, Ferran. 2019. "A Compact Thévenin Model for a Rectenna and Its Application to an RF Harvester with MPPT" Sensors 19, no. 7: 1641. https://doi.org/10.3390/s19071641

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