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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 687256, 9 pages
Research Article

Flexible Hilbert-Curve Loop Antenna Having a Triple-Band and Omnidirectional Pattern for WLAN/WiMAX Applications

School of Electronics Engineering, Kyungpook National University, Sankyuk-dong Puk-gu, Daegu 702-701, Republic of Korea

Received 14 December 2011; Revised 20 January 2012; Accepted 25 January 2012

Academic Editor: Ana Collado

Copyright © 2012 Dang-Oh Kim 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 triple-band flexible loop antenna is proposed for WLAN/WiMAX applications in this paper. The proposed antenna is formed by the third-order Hilbert-curve and bending type structure which provides flexible characteristics. Even though the radius of the curvature for bending antennas is changed, a triple-band feature still remains in the proposed antenna. Moreover, the antenna exhibits the characteristics of omnidirectional radiation pattern and circular polarization. To verify the receiving performance of antenna, a simulation on the antenna factor was conducted by an EM simulator. Based on these results, the suggested antenna makes a noteworthy performance over typical loop antennas.