Vol. 11

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues

Pattern Optimization in an UWB Spiral Array Antenna

By Amir Jafargholi and Manouchehr Kamyab
Progress In Electromagnetics Research M, Vol. 11, 137-151, 2010


We have proposed a new architecture for an array in which the elements are placed on a spiral curve in order to obtain an ultra wideband (UWB) radiation pattern. In addition, array factor and bandwidth of the proposed spiral array are calculated. Simulated results obtained by SuperNEC and CST software have shown good agreement with the analytic calculations. Although the proposed antenna array is wideband in nature, it lacks desirable efficiency, due to poor front to back ratio (FBR) and sidelobe level (SLL). In this paper, we have chosen three different approaches in order to improve the e±ciency of proposed array. First, the effect of length and thickness tapering of elements has been studied. Second, we have used Genetic Algorithm (GA) to optimized pattern shape. Finally, the influence of metamaterial cover on array performance has been investigated. Although the first and second methods improve the radiation pattern, the array bandwidth is reduced. It is shown that the third method improves array directivity and FBR by 5-7 dB and 15-17 dB respectively within the frequency band of operation.


Amir Jafargholi and Manouchehr Kamyab, "Pattern Optimization in an UWB Spiral Array Antenna," Progress In Electromagnetics Research M, Vol. 11, 137-151, 2010.


    1. Allen, B., M. Dohler, E. E. Okon, W. Q. Malik, A. K. Brown, and D. J. Edwards, "Ultra-wideband Antennas and Propagation for Communications, Radar and Imaging," John Wiley, New York, 2007.

    2. Rajagopalan, A., G. Gupta, A. S. Konanur, B. Hughes, and G. Lazzi, "IEEE Trans. Antennas Propag.," Increasing channel capacity of an ultrawideband MIMO system using vector antennas , Vol. 55, No. 10, 2880-2887, Oct. 2007.

    3. Ren, Y.-J. and K. Chang, "An ultrawideband microstrip dual ring antenna for millimeter-wave applications," IEEE Trans. Antennas Propag., Vol. 6, 457-459, 2007.

    4. Panduro, M. A. and C. del Rio Bocio, "Design of beam-forming networks for scannable multi-beam antenna arrays using corps," Progress In Electromagnetics Research, Vol. 84, 173-188, 2008.

    5. Emadi, M., K. H. Sadeghi, A. Jafargholi, and F. Marvasti, "Co channel interference cancellation by the use of iterative digital beamforming method," Progress In Electromagnetics Research, Vol. 87, 89-103, 2008.

    6. Jafargholi, A., M. Mousavi, M. Emadi, and M. Nayebi, Wide-band nulling by five elements spiral array antenna, 6-th International Conference on ITS Telecommunications, 446-448, 2006.

    7. Weng, Z.-B., Y.-C. Jiao, G. Zhao, and F.-S. Zhang, "Design and experiment of one dimension and two dimension metamaterial structures for directive emission ," Progress In Electromagnetics Research, Vol. 70, 199-209, 2007.

    8. Liang, L., C. H. Liang, L. Chen, and X. Chen, "A novel broadband EBG using cascaded mushroom-like structure," Microw. Opt. Technol. Lett., Vol. 50, No. 8, 2167-2170, 2008.

    9. Alu, A., F. Bilotti, N. Engheta, and L. Vegni, "Metamaterial covers over a small aperture," IEEE Trans. Antennas Propag., Vol. 54, No. 6, 1632-1643, Jun. 2006.

    10. Xu, H., Z. Zhao, Y. Lv, C. Du, and Luo, "Metamaterial superstrate and electromagnetic band-gap substrate for high directive antenna," Int. J. Infrared Milli. Waves, Vol. 29, 493-498, 2008.

    11. Zhu, F., Q. Lin, and J. Hu, "A directive patch antenna with a metamaterial cover," Proceedings of Asia Pacific Microwave Conference, 2005.

    12. Huang, C., Z. Zhao, W. Wang, and X. Luo, "Dual band dual polarization directive patch antennausing rectangular metallic grids metamaterial ," J. Infrared Milli. Terahz Waves, Vol. 30, 700-708, 2009.

    13. Temelkuaran, B., M. Bayindir, E. Ozbay, R. Biswas, M. Sigalas, G. Tuttle, and K. M. Ho, "Photonic crystal-based resonant antenna with a very high directivity," Journal of Applied Physics, Vol. 87, 603-605, 2000.

    14. Enoch, S., G. Tayeb, P. Sabouroux, N. Guerin, and P. Vincent, "A metamaterial for directive emission," Physical Review Letters, Vol. 89, 213902, 2002.

    15. Ju, J., D. Kim, W. J. Lee, and J. I. Choi, "Wideband high-gain antenna using metamaterial superstrate with the zero refractive index," Microw. Opt. Technol. Lett., Vol. 51, No. 8, 1973-1976, 2009.

    16. Yang, F. and Y. Rahmat-Samii, Electromagnetic Band Gap Structures in Antenna Engineering, Cambridge University Press, 2008.

    17. Nakano, H., K. Kikkawa, N. Kondo, Y. Iitsuka, and J. Yamauchi, "Low-profile equiangular spiral antenna backed by an EBG reflector ," IEEE Trans. Antennas Propag., Vol. 57, No. 5, 1309-1318, May 2009.