Study Of Circular Arrays Of Radial And Tangential Dipoles

Study of Circular Arrays of Radial and Tangential Dipoles

The circular arrays investigated consist of N identical center-fed cylindrical dipoles which lie in the plane of a circle and whose centers are equally spaced around the circumference of the circle. In the case designated 'tangential arrays' the elements are placed tangential to the circle and in the case designated 'radial arrays' they are placed radial to the circle. This study first presents the derivation of the integral equations defining the vector potential over the surfaces of the elements. These equations are reduced to a single integral equation by using sequence terminal voltages. The Gaussian quadrature formula for numerical integration is used to solve the equation for each sequence. Methods of obtaining the sequence terminal admittances are also described. Experimental results are compared with theory for a driven monopole in a tangential array positioned on a ground-plane. Radiation patterns determined from the numerical currents are compared with those obtained from assumed sinusoidal currents. (Author).

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