Electrically Small Supergain Arrays

Details Electrically Small Supergain Arrays Electrically Small Supergain Arrays

2007-08-15

arxiv.org/abs/0708.1988v1

Published in Radio Science, vol. 43, RS3002, 2008

Physics

Classical Physics

10 pages, 11 figures, submitted to IEEE Transactions on Antennas and Propagation (December 2006)

Scientific paper

10.1029/2007RS003747

The theory, computer simulations, and experimental measurements are presented for electrically small two-element supergain arrays with near optimal endfire gains of 7 dB. We show how the difficulties of narrow tolerances, large mismatches, low radiation efficiencies, and reduced scattering of electrically small parasitic elements are overcome by using electrically small resonant antennas as the elements in both separately driven and singly driven (parasitic) two-element electrically small supergain endfire arrays. Although rapidly increasing narrow tolerances prevent the practical realization of the maximum theoretically possible endfire gain of electrically small arrays with many elements, the theory and preliminary numerical simulations indicate that near maximum supergains are also achievable in practice for electrically small arrays with three (and possibly more) resonant elements if the decreasing bandwidth with increasing number of elements can be tolerated.

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