ELEDIA

Special Session @MIWAI 2017 organized by ELEDIA@UTB
The ELEDIA Research Center announces that Dr. Minh-Son Dao (Director ELEDIA@UTB), Dr. Federico Viani (ELEDIA@UniTN) and Dr. Saleem Mohamad (ELEDIA@UTB) will…
Ing. Ahmed won the "Student Competition Award" at QNDE-2017
The ELEDIA Research Center is pleased to announce that Ing. S. Ahmed won among all the applicants disciplines into "Student Competition…
IEEE-JMMCT Special Section on MbD
The ELEDIA Research Center is pleased to announce an upcoming Special Section of the IEEE Journal on Multiscale and Multiphysics…
R. J. Mailloux has joined ELEDIA
The ELEDIA Research Center is pleased to announce that Dr. R. J. Mailloux is member of the ELEDIA Teaching Staff.…
 
 
A modern antenna system should be able to maintain high quality communication links through a suitable modification of its operating conditions (i.e., radiation pattern and frequency band) to avoid jammings and interference signals from external sources. In this framework, time-modulated arrays have proved to be very flexible systems since they allow to reconfigure the radiated pattern just acting on the state (on/off) of a set of RF switches inserted in the feed network: thanks to these features, they can be considered as very good candidates for the new generation transmission systems controlled via software, the Software Defined Radio (SDR), since they allow to completely reconfigure the beam in a reliable and simple way through digital signals in function of the working scenario.
   
Satellite systems for wireless communications, radar applications, antenna for cellular base stations, earth observation

 

 

Pulse Sequence
 
Unfortunatly, the use of time-modulation technique in antenna array synthesis produces undesired radiations that correspond to a power wasting that affect array performance: to overcome this drawback, members of the ELEDIA Research Center have developed innovative strategies in order to get the suitable pulse sequences exciting the elements of the array that allow to synthesize a desired pattern at the work frequency minimizing the amount of wasted power in the sideband radiation. Several approaches based on the particle swarm optimization have been proposed in order to achieve the best compromise between the simplicity of reconfiguration of the system and the power loss, considering both communication and radar applications. Moreover, the possibility to exploit the sideband radiations for useful purposes have been investigated with the aim of synthesizing multi-beam patterns at different harmonic frequencies radiated by a single antenna system.

 

Antenna Sketch

 

Synthesized Beam Pattern

Keywords: Time-Modulation, Time-Modulated Arrays, Harmonic Beamforming, Adaptive Antenna Systems, Particle Swarm Optimization


See Also
  • L. Poli, P. Rocca, L. Manica, and A. Massa, "Handling sideband radiations in time-modulated arrays through particle swarm optimization," IEEE Trans. Antennas Propag., vol. 58, no. 4, pp. 1408-1411, Apr. 2010. 
    doi:10.1109/TAP.2010.2041165
  • 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, Nov. 2009. 
    doi:10.1049/iet-rsn.2009.0058
  • L. Poli, P. Rocca, L. Manica, and A. Massa, "Time modulated planar arrays - analysis and optimisation of the sideband radiations," IET. Microw. Antennas & Propag., Vol. 4, Iss. 9, pp. 1165-1171, 2010. 
    doi:10.1049/iet-map.2009.0379
  • L. Poli, P. Rocca, L. Manica, and A. Massa, "Pattern synthesis in time-modulated linear arrays through pulse shifting," IET. Microw. Antennas & Propag., Vol. 4, Iss. 9, pp. 1157-1164, 2010. 
    doi:10.1049/iet-map.2009.0042
  • P. Rocca, L. Poli, G. Oliveri, and A. Massa, "Synthesis of time-modulated planar arrays with controlled harmonic radiations," J. Of Electromagn. Waves and Appl., vol. 24, no. 4, pp. 827-838, 2010. 
    doi:10.1163/156939310791036304
  • L. Poli, P. Rocca, G. Oliveri, and A. Massa, "Adaptive nulling in time-modulated linear arrays with minimum power losses," IET. Microw. Antennas Propag., vol. 5, no. 2, pp. 157-166, 2011. 
    doi:10.1049/iet-map.2010.0015
  • P. Rocca, L. Poli, G. Oliveri, and A. Massa, "Synthesis of Sub-Arrayed Time Modulated Linear Arrays Through a Multi-Stage Approach", IEEE Trans. Antennas Propag., vol. 59, no. 9, pp. 3246-3254, Sep. 2011. 
    doi:10.1109/TAP.2011.2161535
  • L. Poli, P. Rocca, G. Oliveri, and A. Massa, "Harmonic beamforming in time-modulated linear arrays through particle swarm optimization," IEEE Trans. Antennas Propag., vol. 59, no. 7, pp. 2538-2545, Jul. 2011. 
    doi:10.1109/TAP.2011.2152323
  • L. Poli, P. Rocca, G. Oliveri, and A. Massa, “Failure correction in time-modulated linear arrays,” IET Radar, Sonar & Navigation, vol. 8, no. 3, pp. 195-201, Mar. 2014.
    doi:10.1049/iet-rsn.2013.0027
  • P. Rocca, Q. Zhu, E. T. Bekele, S. Yang, and A. Massa, “4D arrays as enabling technology for cognitive radio systems,” IEEE Transactions on Antennas and Propagation - Special Issue on “Antenna Systems and Propagation for Cognitive Radio,” vol. 62, no. 3, pp. 1102-1116, Mar. 2014.
    doi:10.1109/TAP.2013.2288109
  • E. T. Bekele, L. Poli, M. D'Urso, P. Rocca, and A. Massa, "Pulse-shaping strategy for time modulated arrays - Analysis and design," IEEE Trans. Antennas Propag., vol. 61, no. 7, pp. 3525-3537, July 2013.
    doi:10.1109/TAP.2013.2256096
  • P. Rocca, L. Poli, G. Oliveri, and A. Massa, "Adaptive nulling in time-varying scenarios through time-modulated linear arrays," IEEE Antennas Wireless Propag. Lett., vol. 11, pp. 101-104, 2012.
    doi:10.1109/LAWP.2012.2183849
  • P. Rocca, L. Poli, and A. Massa, "Instantaneous directivity optimization in time-modulated array receivers," IET Microwaves, Antennas & Propagation, vol. 6, no. 14, pp. 1590-1597, Nov. 2012.
    doi:10.1049/iet-map.2012.0400
  • P. Rocca, L. Poli, L. Manica, and A. Massa, "Synthesis of monopulse time-modulated planar arrays with controlled sideband radiation," IET Radar, Sonar & Navigation, vol. 6, no. 6, pp. 432-442, 2012.
    doi:10.1049/iet-rsn.2012.0005
  • L. Poli, P. Rocca, and A. Massa, "Sideband radiation reduction exploiting pattern multiplication in directive time-modulated linear arrays," IET Microwaves, Antennas & Propagation, vol. 6, no. 2, pp. 214-222, 2012.
    doi:10.1049/iet-map.2011.0159