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Arrays With Electrically Long Elements


  • Ronald W. P. King,

  • Sheldon S. Sandler


A new method is described for determining the properties of arrays of parallel elements that are at least a wavelength long. This is a first step in a study of the behavior of arrays when the elements are driven by pulsed instead of steady-state voltages. The new solution for the distributions of current in and driving-point admittances of the coupled elements makes use of a method of successive approximations in which the boundary condition on the tangential electric field is satisfied separately for the induced and the driven current. The procedure begins with the known solution for an isolated, electrically long antenna and modifies this to take account of the mutual interaction. Graphs of the currents in electrically long two- and three-element arrays are shown, and driving-point admittances are given.

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