eprintid: 444
rev_number: 6
eprint_status: archive
userid: 5
dir: disk0/00/00/04/44
datestamp: 2011-07-08
lastmod: 2013-07-01 13:19:43
status_changed: 2013-07-01 13:19:43
type: techreport
metadata_visibility: show
item_issues_count: 0
creators_name: Poli, Lorenzo
creators_name: Rocca, Paolo
creators_name: Oliveri, Giacomo
creators_name: Lizzi, Leonardo
creators_name: Massa, Andrea
title: Antenna Array Synthesis Through Time Modulation
ispublished: pub
subjects: TU
full_text_status: public
abstract: In the last years, there has been a renewed interest towards the use of time-modulated arrays (TMAs) thanks to the simplicity in reconfiguring the average pattern of the antenna just modifying the on-off sequence controlling a set of radio-frequency (RF) switches. TMAs have been originally introduced for the generation of low and ultra-low sidelobe patterns for radar arrays [1] thus avoiding the implementation of impracticable excitation tapering with high dynamic range ratios. However, they haven’t received a large diffusion because of the power losses due to the generation of harmonic radiation at multiples of the time-modulation frequency. As a matter of fact, the periodic modulation of the static excitations causes a shift of the radiated power in the sideband radiation (SR) [2] with a consequent reduction of the directivity of the pattern at the carrier frequency.
date: 2011-01
date_type: published
institution: University of Trento
department: informaticat
refereed: FALSE
referencetext: [1] 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. [2] 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. [3] 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. [4] 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. [5] L. Poli, L. Manica, P. Rocca, and A. Massa, “Handling sideband radiations in time-modulated arrays through particle swarm optimization”, IEEE Trans. Antennas Propag., in press. [6] P. Rocca, L. Manica, L. Poli, and A. Massa, "Synthesis of compromise sum-difference arrays through time-modulation," IET Radar, Sonar & Navigation, vol. 3, no. 6, pp. 630-637, Dec. 2009. [7] G. Li, S. Yang, and Z. Nie, “A study on the application of time modulated antenna arrays to airborne pulsed doppler radar,” IEEE Trans. Antennas Propag., vol. 57, no. 5, pp. 1578-1582, May 2009. [8] A. Tennant and B. Chambers, "Time-switched array of phase-switched screens," IEEE Trans. Antennas Propag., vol. 57, no. 3, pp. 808-812, Mar. 2009. [9] L. Manica, P. Rocca, L. Poli, and A. Massa, "Almost time-independent performance in time-modulated linear arrays," IEEE Antennas Wireless Propag. Lett., vol. 8, pp. 843-846, Aug. 2009.
citation:   Poli, Lorenzo and Rocca, Paolo and Oliveri, Giacomo and Lizzi, Leonardo and Massa, Andrea  (2011) Antenna Array Synthesis Through Time Modulation.  [Technical Report]     
document_url: http://www.eledia.org/students-reports/444/1/DISI-11-176.C191.pdf