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PIERS Online
Vol. 4
No. 3
2008
pp: 366-370Circular Polarization GPS Patch Antennas with Self-biased Magnetic FilmsGuomin Yang, Andrew Daigle, Nian-Xiang Sun, and Krishna Naishadham doi:10.2529/PIERS070906120008 Downloads: 1224 Abstract:Magneto-dielectric substrates with thin magnetic films show great potential in realizing electrically small tunable antennas with improved directivity and higher bandwidth than those realized on dielectric substrates. This paper introduces self-biased magnetic films as a practical means to tune a patch antenna by loading a commercially available dielectric substrate. Novel antenna designs with self-biased metallic magnetic films and ferrite films were investigated. These magnetic patch antennas have improved the axial ratio from 1.57 dB to 0.97 dB with respect to the central frequency ranging from 1.575 GHz to 1.562 GHz, a large radiation frequency tunability of about 40% to 80% of the -10 dB bandwidth, and a significantly enhanced directivity.References:1. Wong, K. L., Planar Antennas for Wireless Communications, John Wiley, Hoboken, NJ, 2003. 2. Mosallaei, H. and K. Sarabandi, "Antenna miniaturization and bandwidth enhancement using a reactive impedance substrate," IEEE Trans. Antennas and Propagat., Vol. 52, No. 9, 2403-2414, September, 2004. 3. Brown, A. D., J. L. Volakis, L. C. Kempel, and Y. Y. Botros, "Patch antennas on ferromagnetic substrates," IEEE Trans. Antennas Propagat., Vol. 47, No. 1, 26-32, January, 1999. 4. Bell, J. M., M. F. Iskander, and J. J. Lee, "UWB hybrid EBG/ferrite ground plane for lowprofile array antennas," IEEE Trans. Antennas Propagat., Vol. 55, No. 1, 4-12, January, 2007. 5. Huang, C. Y., J. Y. Wu, and K. L. Wong, "Cross-slot coupled microstrip antenna and dielectric resonator antenna for circular polarization," IEEE Trans. Antennas and Propagat., Vol. 47, No. 4, 605-609, April, 1999. 6. Sun, N. X., J. W. Wang, A. Daigle, C. Pettiford, H. Mosallaei, and C. Vittoria, "Electronically tunable magnetic patch antennas with metal magnetic films," Electronics Letters, Vol. 43, No. 8, 434-435, 2007. |
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