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Design of wide-band arrays for low side-lobe level beam patterns by simulated annealing

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3 Author(s)
Cardone, G. ; CRS4 Center for Adv. Studies, Res. & Dev. in Sardinia, Cagliari, Italy ; Cincotti, G. ; Pappalardo, M.

We address the window design problem of linear arrays to be used in wide-band beamforming systems. During last decades, stochastic optimization algorithms have proven to be very efficient in optimal beamforming synthesis, but most research interest has focused on linear and two-dimensional arrays under narrow-band excitation. In the present paper, we introduce a general approach, based on the simulated annealing optimization algorithm, to design uniformly spaced wide-band arrays that generate low side-lobe level beam patterns. The effectiveness of different beam pattern formulations is evaluated within the proposed framework; we also consider three different methods to control the side-lobe level, yielding different array performances. Moreover, we investigate the influence of the frequency bandwidth on the optimized beam patterns.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:49 ,  Issue: 8 )