Vol. 22

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Steerable Antenna Using Algorithm Based on Downhill Simplex Method

By Noorsaliza Abdullah and Yoshihiko Kuwahara
Progress In Electromagnetics Research C, Vol. 22, 23-34, 2011


Electronically steerable passive array radiator (ESPAR) antennas are expected to gain prominence in the field of wireless communication, because they can be steered toward a desired signal and they can eliminate interference; in addition, they have a very simple architecture that has significantly low power consumption and are inexpensive to manufacture. In this paper, we proposed an ESPAR antenna that has fastest convergence time. The downhill simplex method is used to maximize the correlation coefficient between the received signal and the reference signal. The simulation results indicate that this antenna can be steered toward the desired signal if one signal is used; in addition, it can eliminate interference if two signals, namely, the desired signal and the delayed signal are used by automatically varying the reactance values.


Noorsaliza Abdullah and Yoshihiko Kuwahara, "Steerable Antenna Using Algorithm Based on Downhill Simplex Method," Progress In Electromagnetics Research C, Vol. 22, 23-34, 2011.


    1. Harrington, R., "Reactively controlled directive arrays," IEEE Transactions on Antennas and Propagation, Vol. 26, No. 3, 390-395, May 1978.

    2. Dinger, R. J., "Reactively steered adaptive array using microstrip patch elements at 4 GHz ," IEEE Transactions on Antennas and Propagation, Vol. 32, 848-856, Aug. 1984.

    3. Preston, S. L., D. V. Thiel, J. W. Lu, S. G. O'Keefe, and T. S. Bird, "Electronic beam steering using switched parasitic elements," Electronic Letters, Vol. 33, No. 1, 7-8, Jan. 1997.

    4. Sibille, A., C. Roblin, and G. Poncelet, "Circular switched monopole array for beam steering wireless communication," Electronic Letters, Vol. 33, No. 7, 551-552.

    5. Vaughn, R., "Switched parasitic elements for antenna diversity," IEEE Transactions on Antennas and Propagation, Vol. 47, No. 2, 399-405, Feb. 1999.

    6. Kamarudin, M. R. B. and P. S. Hall, "Switch beam antenna array with parasitic elements," Progress In Electromagnetics Research B, Vol. 13, 187-201, 2009.

    7. Thiel, D. V. and S. Smith, Switched Parasitic Antennas for Cellular Communication, Artech House, 2001.

    8. Cheng, J., Y. Kamiya, and T. Ohira, "Adaptive beamforming of ESPAR antenna based on steepest descent gradient algorithm," IEICE Transactions on Communication, Vol. E84-B, No. 7, 1790-1800, Jul. 2001.

    9. Sun, C., A. Hirata, T. Ohira, and N. C. Karmakar, "Fast beamforming of electronically steerable parasitic array radiator antennas: Theory and experiment," IEEE Transactions on Antennas and Propagation, Vol. 52, No. 52, 1819-1832, Jul. 2004.

    10. Kuwahara, Y., "Adaptive beamforming on ESPAR antenna by the direct search," IEICE Transactions on Communications, Vol. J89-B, No. 1, 39-44, Jan. 2006.

    11. Abdullah, N. and Y. Kuwahara, "Adaptive beamforming for ESPAR by means of downhill simplex method," IEICE Tech. Report, Vol. 109, No. 218, 37-42, AP 2009-103, Oct. 2009.

    12. Nelder, J. A. and R. Mead, "A simplex method for function minimization," Computer Journal, Vol. 7, No. 4, 308-313, 1965.

    13. William, T. V., H. P. William, A. T. Saul, and P. F. Brian, Numerical Recipes the Art of Scientific Computing, Cambridge University Press, 1993.