Broadband Bent Triangular Omnidirectional Antenna for RF Energy Harvesting

In this letter, a broadband bent triangular omnidirectional antenna is presented for RF energy harvesting. The antenna has a bandwidth for VSWR ≤ 2 from 850 MHz to 1.94 GHz. The antenna is designed to receive both horizontal and vertical polarized waves and has a stable radiation pattern over the en...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2016-01, Vol.15, p.36-39
Main Authors: Arrawatia, Mahima, Baghini, Maryam Shojaei, Kumar, Girish
Format: Article
Language:English
Subjects:
Antenna measurements
Antenna radiation patterns
Broadband
Broadband antennas
Energy harvesting
Impedance
omnidirectional microstrip antenna
quasi-isotropic
Radio frequency
RF energy harvesting
stable radiation pattern
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Summary:In this letter, a broadband bent triangular omnidirectional antenna is presented for RF energy harvesting. The antenna has a bandwidth for VSWR ≤ 2 from 850 MHz to 1.94 GHz. The antenna is designed to receive both horizontal and vertical polarized waves and has a stable radiation pattern over the entire bandwidth. Antenna has also been optimized for energy harvesting application and it is designed for 100 Ω input impedance to provide a passive voltage amplification and impedance matching to the rectifier. A peak efficiency of 60% and 17% is obtained for a load of 500 Ω at 980 and 1800 MHz, respectively. At a cell site while harvesting all bands simultaneously a voltage of 3.76 V for open circuit and 1.38 V across a load of 4.3 k Ω is obtained at a distance of 25 m using an array of two elements of the rectenna.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2015.2427232