This paper presents an efficient single-band rectenna for radio frequency energy harvesting at the 2.45 GHz ISM band. For this purpose, a stacked cylindrical dielectric resonator antenna (SCDRA) has been used. The RF harvester has also a matching network and a rectifier. Two different dielectric materials are used to broaden the bandwidth of the antenna and improve the gain at the frequency of 2.45 GHz. The SCDRA has been fed using aperture coupled feed technique. As well known, the antenna converts the electromagnetic waves into electrical signals, however these signals have a low RF power. To overcome this limit, a multi-stage voltage doubler rectifier is used. It allows increasing the efficiency and yields a satisfactory output voltage. Besides, a simple impedance matching network, is placed between the antenna and the rectifier circuit to ensure a maximum power transfer. We used the advanced design system (ADS) simulator for the design of the rectifier and matching network circuit. To investigate the performance of the proposed rectenna, simulation results are presented and discussed. Our rectenna achieves RF to DC conversion efficiency up to 70% with an output voltage of 3 V at an input power of 10 dBm.
Guernine et al. (Sun,) studied this question.