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International Journal of Antennas and Propagation
Volume 2018, Article ID 1692018, 9 pages
Research Article

A Novel Wideband Circularly Polarized Antenna for RF Energy Harvesting in Wireless Sensor Nodes

1Department of Instrumentation and Industrial Informatics, School of Electrical Engineering, Hanoi University of Science and Technology, Hanoi 10000, Vietnam
2University of Grenoble Alpes, Grenoble, France
3Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi 10000, Vietnam

Correspondence should be addressed to Minh Thuy Le; nv.ude.tsuh@hnimel.yuht

Received 16 September 2017; Revised 24 December 2017; Accepted 8 January 2018; Published 11 March 2018

Academic Editor: N. Nasimuddin

Copyright © 2018 Nhu Huan Nguyen et al. 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.


A novel wideband circularly polarized antenna array using sequential rotation feeding network is presented in this paper. The proposed antenna array has a relative bandwidth of 38.7% at frequencies from 5.05 GHz to 7.45 GHz with a highest gain of 12 dBi at 6 GHz. A corresponding left-handed metamaterial is designed in order to increase antenna gain without significantly affecting its polarization characteristics. The wideband circularly polarized antenna with 2.4 GHz of bandwidth is a promising solution for wireless communication system such as tracking or wireless energy harvesting from Wi-Fi signal based on IEEE 802.11ac standard or future 5G cellular. A potential application of this antenna as a receiving antenna for RF-DC device to obtain DC power for a wireless sensor node from Wi-Fi signal is shown.