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Optimal virtual element patterns for adaptive arrays

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2 Author(s)
Salonen, I. ; IDC, Helsinki Univ. of Technol., Espoo, Finland ; Vainikainen, P.

A major problem in the use of small arrays is the perturbation in the element patterns due to mutual coupling and diffraction effects. The element patterns differ from each other and need to be corrected in order to obtain an array pattern that is close to the desired one. A matrix method can be used to correct the element patterns by modifying the original input/output weights to corresponding weights for corrected elements and vice versa. In this paper the main goal of the array correction is the maximal identity of the element patterns. In addition to identical element patterns the corrected array is characterized by uniform element spacing, which can be chosen to differ significantly from the element spacing in the real array making the corrected array more like a pure virtual array. For the array correction the linear least square error method has been used. To show the applicability of the virtual array, this method is applied to a typical beam scan case, and also over a frequency band.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:54 ,  Issue: 1 )

Date of Publication:

Jan. 2006

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