Author details

Abdul Quddious<sup>1</sup> \*, Marco A. Antoniades<sup>1</sup> , Photos Vryonides<sup>2</sup> and Symeon Nikolaou<sup>2</sup>

1 Department of Electrical and Computer Engineering, University of Cyprus, Nicosia, Cyprus

2 Frederick University and Frederick Research Center, Nicosia, Cyprus

\*Address all correspondence to: quddious.abdul@ucy.ac.cy

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

As can be seen in the IC schematic, the enabling terminal (EN) must be connected with the output of the voltage doubler. When the rectified voltage and thus the VEN voltage gets higher than 0.43 V, the DC voltage on the output terminal becomes equal to the Vcc biasing voltage, which can be anywhere between 0.9 and 1.8 V. This way the DC-to-DC booster output voltage can be elevated up to 1.8 V assuming that the rectified voltage is higher than 0.43 V. Figure 18b indicates how the output voltage of the booster (VBooster) goes from 0 to 1.8 V depending on the continuous variation of the rectified voltage at the output of the voltage-doubler rectifier (VRectified) and whether this is larger or smaller than the minimum VEN

Power management unit (a) schematic of DC-to-DC power booster and (b) measured voltage across DC-to-DC power booster and rectifier output with variable distance between transmitter and rectenna at 15 dBm

1.6 GHz energy harvesting system (a) simulated and measured |S11| of PIFA antennae, (b) measured |S11|of 1.6 GHz rectifier, (c) 1.6 GHz rectenna system on Roger RO4003C, and (d) simulated and measured efficiency

voltage, which is 0.43 V.

Figure 17.

Figure 18.

210

and rectified voltage vs. input power [10].

Recent Wireless Power Transfer Technologies

transmitted power from the signal generator [10].
