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Optimum element spacings for Yagi-Uda arrays

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2 Author(s)
Cheng, D. ; Syracuse University, Syracuse NY, USA ; Chen, C.

A method is developed for the maximization of the forward gain of a Yagi-Uda array by adjusting the interelement spacings. The effects of a finite dipole radius and the mutual coupling between the elements are taken into consideration. Currents in the array elements are approximated by three-term expansions with complex coefficients which convert the governing integral equations into simultaneous algebraic equations. The array gain is maximized by the repeated application of a perturbation procedure which converges rapidly to yield a set of optimum, generally unequal, element spacings. This method eliminates the need for a haphazard trial-and-error approach or for interpreting a vast data collection. Illustrative examples are given.

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Antennas and Propagation, IEEE Transactions on  (Volume:21 ,  Issue: 5 )