Realizing Efficient Wireless Power Transfer Using Small Folded Cylindrical Helix Dipoles

Author

Yoon, Ick-Jae ; Ling, Hao

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX, USA

Volume

9

fYear

2010

fDate

7/2/1905 12:00:00 AM

Firstpage

846

Lastpage

849

Abstract

We demonstrate that electrically small antennas can be designed to approach the recently derived theoretical bounds for wireless power transfer. Short dipole coupling is first simulated to determine the antenna design specifications for efficient coupling beyond the coupled mode region. Electrically small (kr=0.31) but highly efficient folded cylindrical helix (FCH) dipoles with 50- input impedance are designed. The power transfer efficiency (PTE) between two such antennas is simulated for the colinear and parallel configurations. Two FCH dipoles are constructed, and the PTE between them is measured and compared to the simulation. The measured results show a PTE of 40% at a distance of 0.25 (0.39 m at 195 MHz) in the colinear configuration.

Keywords

VHF antennas; circular waveguides; dipole antennas; dipole coupling; electric moments; helical antennas; radiocommunication; FCH dipoles; PTE; dipole coupling; electrically small antennas; folded cylindrical helix; frequency 145 MHz; wireless power transfer efficiency; Antenna measurements; Dipole antennas; Helical antennas; Impedance; Receiving antennas; Coupled mode region; electrically small antennas; power transfer efficiency (PTE); wireless power transfer;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2010.2068534

Filename

5551173