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Basic NEC with Broadcast Applications by J.L. Smith

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8.1 Objective

One of the objects of a NEC-2 analysis is to calculate a close approximation of an array's driving point impedances when the array elements are in the active condition. In this instance, the active condition is defined as the condition that exists when the elements are driven by the currents and phases that yield the desired pattern. In association with that objective, it is generally believed that if the array elements are modeled such that their calculated self-impedances match the measured self-impedances of the elements of the physical array under passive conditions (i.e., with no drive currents applied) then, because the ...

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