eprintid: 466 rev_number: 4 eprint_status: archive userid: 5 dir: disk0/00/00/04/66 datestamp: 2011-03-25 lastmod: 2013-07-01 09:33:28 status_changed: 2013-07-01 09:33:28 type: techreport metadata_visibility: show item_issues_count: 0 creators_name: Poli, Lorenzo creators_name: Rocca, Paolo creators_name: Manica, Luca creators_name: Massa, Andrea title: Handling SidebandRadiations in Time-Modulated Arrays through Particle Swarm Optimization ispublished: pub subjects: TU full_text_status: public keywords: Linear Arrays, Time-Modulated Arrays, Pattern Synthesis abstract: In this letter, the minimization of the power losses in time-modulated arrays is addressed by means of a suitable strategy based on Particle Swarm Optimization. By properly modifying the modulation sequence, the method is aimed at reducing the amount of wasted power, analytically computed through a very effective closed-form relationship, while constraining the radiation pattern at the carrier frequency below a fixed sidelobe level. Representative results are reported and compared with previously published solutions to assess the effectiveness of the proposed approach. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. date: 2009-09 date_type: published institution: University of Trento department: informaticat refereed: TRUE referencetext: [1] H. E. Shanks and R. W. Bickmore, “Four-dimensional electromagnetic radiators,” Canad. J. Phys., vol. 37, pp. 263-275, Mar. 1959. [2] W. H. Kummer, A. T. Villeneuve, T. S. Fong , and F. G. Terrio, “Ultra-low sidelobes from time-modulated arrays,” IEEE Trans. Antennas Propag., vol. 11, no. 6, pp. 633-639, Nov. 1963. [3] R.W. Bickmore, “Time versus space in antenna theory,” in Microwave Scanning Antennas, R. C. Hansen, Ed. Los Altos, CA: Peninsula, 1985, vol. III, ch. 4. [4] J. C. Brégains, J. Fondevila, G. Franceschetti, and F. Ares, “Signal radiation and power losses of time-modulated arrays,” IEEE Trans. Antennas Propag., vol. 56, no. 6, pp. 1799- 1804, Jun. 2008. [5] S. Yang, Y. B.Gan, A. Qing, and P. K. Tan, “Design of a uniformamplitude timemodulated linear array with optimized time sequences,” IEEE Trans. Antennas Propag., vol. 53, no. 7, pp. 2337-2339, Jul. 2005. [6] A. Tennant and B. Chambers, “Time-switched array analysis of phase-switched screens,” IEEE Trans. Antennas Propag., vol. 57, no. 3, pp. 808-812, Mar. 2009 . [7] J. Fondevila, J. C. Brégains, F. Ares, and E. Moreno, “Application of time modulation in the synthesis of sum and difference patterns by using linear arrays,” Microw. Opt. Technol. Lett., vol. 48, pp. 829-832, 2006. [8] S. Yang, Y. B. Gan, and A. Qing, “Sideband suppression in time-modulated linear arrays by the differential evolution algorithm,” IEEE Antennas Wireless Propag. Lett., vol. 1, pp. 173-175, 2002. [9] S. Yang, Y. B. Gan, and P. K. Tan, “A new technique for power-pattern synthesis in timemodulated linear arrays,” IEEE AntennasWireless Propag. Lett., vol. 2, pp. 285-287, 2003. [10] J. Fondevila, J. C. Brégains, F. Ares, and E.Moreno, “Optimizing uniformly excited linear arrays through time modulation,” IEEE Antennas Wireless Propag. Lett., vol. 3, pp. 298- 301, 2004. [11] J. Kennedy, R. C. Eberhart, and Y. Shi, Swarm Intelligence. San Francisco, CA: Morgan Kaufmann, 2001. [12] S. Yang, Y. B. Gan, and P. K. Tan, “Evaluation of directivity and gain for time-modulated linear antenna arrays,” Microw. Opt. Technol. Lett., vol. 42, no. 2, pp. 167-171, Jul. 2004. [13] C. L. Dolph, “A current distribution for broadside arrays which optimizes the relationship between beam width and sidelobe level,” Proc. IRE, vol. 34, pp. 335-348, 1946. citation: Poli, Lorenzo and Rocca, Paolo and Manica, Luca and Massa, Andrea (2009) Handling SidebandRadiations in Time-Modulated Arrays through Particle Swarm Optimization. [Technical Report] document_url: http://www.eledia.org/students-reports/466/1/DISI-11-024.R182.pdf