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A novel hybrid approach to the power synthesis of mask-constrained shaped beams by means of concentric-ring isophoric arrays is presented. The basis of this procedure is to use the complex aperture distribution obtained by Elliott–Stern method as a starting point of an innovative algorithm that combines a classical density tapering method with a simulated annealing one. The proposed technique allows to outperform the previous procedures. [ABSTRACT FROM AUTHOR]

Focuses on a study which presented the application of roots searching for fixing nulls with phase-only control in equispaced linear arrays. Discussion on simulated annealing technique; Measurement of null depth; Methodology and results.

Focuses on a study which explored the development of mathematical model for array pattern synthesis in near-zone scatters of three-dimensional vectors. Discussion on simulated annealing technique; Polarization of electromagnetic scattering; Information on simulation process; Methodology and results.

The complexity of antenna array feed networks can be reduced by reducing the number of radiating elements and having the remainder illuminate an auxiliary array of parasitic elements. The performance of such antennas can be optimized by optimization of their geometry. Here we consider parasitic linear arrays of dipoles illuminated by smaller uniformly fed linear arrays so as to generate low-sidelobe sum patterns with good directivity. The results of a FEKO simulation validating the accuracy of the coupling model are presented, and the influence of the relative numbers of active and parasitic dipoles is discussed. [ABSTRACT FROM AUTHOR]

A simple method for synthesising low-sidelobe sum and difference patterns with a common aperture zone is presented. Such a method is based on the perturbation of the Bayliss roots by means of the simulated annealing technique. The appropriate discretisation of the resulting continuous apertures to a linear array would lead to a simplification of its feeding network, mainly due to the above-mentioned shared portion. A complete study is presented to show the scope of the proposed method. [ABSTRACT FROM AUTHOR]

A new antenna concept—the multi-radial travelling wave line antenna — that achieves a broadband conical radiation pattern suitable for use in multiple C-band wireless computer networks is presented. [ABSTRACT FROM AUTHOR]