STUDY OF CIRCULAR ARRAYS OF RADIAL AND TANGENTIAL DIPOLES.
Interim Scientific rept.,
AUBURN UNIV ALA ANTENNA STUDY GROUP
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The elements of the circular antenna arrays investigated in this study consist of N identical center-fed cylindrical dipoles whose centers are equally spaced around the circumference of a circle. This study first presents the derivation of the integral equations defining the vector potential over the surfaces of the elements. The reduction of these equations to a single integral equation is then obtained by the introduction of sequence voltages for the terminal voltages. A numerical solution of this equation for each sequence is then developed employing the Gaussian quadrature formula for numerical integration. These solutions yield the sequence currents for sequence terminal voltages of unit magnitudes. The sequence patterns are then obtained utilizing the predetermined sequence currents. The FORTRAN IV computer program developed for the computation of these currents and patterns is listed in the Appendices. Finally, an experimental investigation is discussed for the measurement of the current distribution on a driven monopole in a tangential array positioned on a groundplane. Included in this discussion are detailed drawings of the experimental apparatus constructed for these measurements. The results of this investigation are then compared with the results of the theoretical investigation. Author
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