volume | PIER Journals

Abstract

Pattern synthesis usually involves determining the strengths of the current sources in a given array that yield a specified pattern. Demonstrating that this pattern can be produced by an actual array of physical elements is a step that is rarely included in the discussion. The purpose of this article is to examine how well a numerical model of these sources will match the desired pattern when mutual interactions between the array elements are taken into account. An investigation of this process is described here using NEC (the Numerical Electromagnetics Code), although any wire-antenna computer code could be used. Modeling wire antennas in codes like NEC typically involves specifying the input or exciting voltage of the antenna to find the induced current from which the far field can be obtained. The pattern-synthesis problem for a specified array geometry, by contrast, requires instead finding the exciting voltages that will induce the synthesized currents needed to produce the pattern of interest. The radiation pattern that results can then be compared with the desired pattern to determine how well the physical array performs. Several examples of this approach are included here to demonstrate the process.

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Dr. Edmund K. Miller