Design and optimization of compact array rectennas for harvesting wireless power

Abraray, Abdel Ghafour; Fernandes, Telmo, Telmo Rui Carvalhinho Cunha, Telmo R.; Maslovski, Stanislav I.

http://hdl.handle.net/10400.8/14355

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Authors

Abraray, Abdel Ghafour

Fernandes, Telmo, Telmo Rui Carvalhinho Cunha, Telmo R.

Maslovski, Stanislav I.

Abstract(s)

The problem of maximization of the power received by an array of compact antennas connected to a number of loads (such as rectifiers) through an optimal matching network is investigated, analytically, numerically and by means of a prototype. The matching network is optimized to match the antennas and load impedances. A decrease in conversion efficiency may be caused by the parasitic capacitance of the rectifier diode. To overcome this issue, we propose an improved detector topology. In this topology, a series inductor L is included in the conventional half bridge detector in order to compensate the effect of the rectifier parasitic capacitance. This LC resonance technique, significantly increases the available DC output power. Measured maximum values of the rectifier's RF-to-DC conversion efficiency of 30% and 50% have been obtained for input power levels ranging from −10 dBm and −2 dBm, at frequencies of approximately 1.84 GHz. The output DC voltage of the rectifier with two input signals of 0 dBm was measured to be 3.10 V at 1.84 GHz.

Keywords

Array of compact antennas Maximization of power Matching network Rectifier

URI

http://hdl.handle.net/10400.8/14355

Citation

A. G. Abraray, T. R. Fernandes and S. I. Maslovski, "Design and optimization of compact array rectennas for harvesting wireless power," The Loughborough Antennas & Propagation Conference (LAPC 2018), Loughborough, 2018, pp. 1-6, doi: 10.1049/cp.2018.1485.