ELEDIA

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A large number of electronic devices exploits multiple wireless standards in modern mobile applications. The dimensions of such products (e.g., mobile handsets) are becoming smaller and smaller following the users’ needs and thanks to the progress of the modern integrated circuit technology. In this framework, it is usually necessary to integrate the RF-part (i.e., the different wireless interfaces) in only one antenna, thus yielding to multi-standard antennas. The design of these radiating systems is highly challenging since a high degree of miniaturization is also required.
In such a framework, fractal shapes have been proposed as a suitable solution for both miniaturization and multi-band issues, while spline-based shapes have been demonstrated very good Ultra-Wideband (UWB) properties.
   
Mobile handsets, smartphones, multi-purpose portable devices

Multiband S11 behaviour
Wideband S11 behaviour
   

 

 

 
Members of the ELEDIA Research Center have developed several cutting edge design approaches for the synthesis of miniaturized perturbed fractal multi-band and spline UWB antennas, based on the exploitation of Evolutionary Optimization, whose capability to deal with electromagnetic problems has been widely demonstrated. This kind of approach enables the formulation of the synthesis problem in terms of an optimization one, which is usually casted either in the time or in the frequency domain (depending on the specific application), where a set of unknown representative geometrical descriptors are tuned through an iterative process aimed at fitting suitable requirements/constraints on the electrical behavior in the desired band(s). The features of the arising designs have been also widely demonstrated through the fabrication and measurement of printed antenna prototypes, which is done in the ELEDIA Research Center facilities.
Fractal-based multi-band geometry
Spline-based UWB geometry

Keywords: Multi-band Antennas, UWB Antennas, Fractal, Spline, Mobile Handsets, Smartphones, Portable Devices, Evolutionary Design


See Also
  • M. D. Migliore, D. Pinchera, A. Massa, R. Azaro, F. Schettino, and L. Lizzi, “An investigation on UWB-MIMO communication systems based on an experimental channel characterization,” IEEE Transactions on Antennas and Propagation, vol. 56, no. 9, pp. 3081-3083, September 2008.
    doi:10.1109/TAP.2008.928814
  • L. Lizzi, F. Viani, R. Azaro, and A. Massa, “A PSO-driven spline-based shaping approach for ultra-wideband (UWB) antenna synthesis,” IEEE Transactions on Antennas and Propagation, vol. 56, no. 8, pp. 2613-2621, August 2008.
    doi:10.1109/TAP.2008.927544
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    doi:10.2528/PIERB10080511
  • L. Lizzi, G. Oliveri, and A. Massa, “A time-domain approach to the synthesis of UWB antenna systems,” Progress in Electromagnetic Research, vol. 122, pp. 557-575, 2012.
    doi:10.2528/PIER11103003
  • L. Lizzi and A. Massa, “Dual-band printed fractal monopole antenna for LTE applications,” IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 760-763, 2011.
    doi:10.1109/LAWP.2011.2163051
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    doi:http://dx.doi.org/10.1163/156939312798954865
  • L. Lizzi and G. Oliveri, “Hybrid design of a fractal-shaped GSM/UMTS antenna,” Journal of Electromagnetic Waves and Applications, vol. 24, no.5/6, pp. 707-719, March 2010.
    doi:10.1163/156939310791036386
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    doi:10.1109/LAWP.2011.2179631
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    doi:10.1109/LAWP.2007.894157
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    doi:10.2528/PIERC12101204
  • F. Viani, M. Salucci, F. Robol, and A. Massa, "Multiband fractal Zigbee/WLAN antenna for ubiquitous wireless environments," Journal of Electromagnetic Waves and Applications, vol. 26, no. 11-12, pp. 1554-1562. 2012.
    doi:10.1080/09205071.2012.704553  
  • R. Azaro, L. Debiasi, E. Zeni, M. Benedetti, P. Rocca, and A. Massa, "A hybrid prefractal three-band antenna for multi-standard mobile wireless applications," IEEE Antennas and Wireless Propagation Letters, vol. 8, pp. 905-908, 2009.
    doi:10.1109/LAWP.2009.2028627  
  • L. Lizzi, F. Viani, and A. Massa, "Dual-band spline-shaped PCB antenna for Wi-Fi applications," IEEE Antennas and Wireless Propagation Letters, vol. 8, pp. 616-619, 2009.
    doi:10.1109/LAWP.2009.2021993
    R. Azaro, F. Viani, L. Lizzi, E. Zeni, and A. Massa, "A monopolar quad-band antenna based on a Hilbert self-affine pre-fractal geometry," IEEE Antennas and Wireless
  • Propagation Letters, vol. 8, pp. 177-180, 2009.
    doi:10.1109/LAWP.2008.2001428 
  • L. Lizzi, F. Viani, E. Zeni, and A. Massa, "A DVBH/GSM/UMTS planar antenna for multimode wireless devices," IEEE Antennas and Wireless Propagation Letters, vol. 8, pp. 616-619, 2009.
    doi:10.1109/LAWP.2009.2022962
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    doi:10.1002/mop.23208