Abstract

AbstractAntennas having highly complicated configuration can be analyzed numerically by the recently proposed moment method and/or remarkably improved computer system, and many analyzed results have also been reported. However, on the other hand, some problems, such as convergence in the moment method, numerical solution of a current distribution feed point, and nonphysical oscillations at an edge, have been pointed out. Although in the analysis of wire antennas, assumptions of slice generator, finite gap generator, or annular ring of magnetic current are used adequately as a feed, it is necessary to know how different is the numerical calculation between them. This paper considers an integral equation obtained with a boundary condition at antenna surface and axis, and an integral equation obtained using an axis current approximation. These integral equations were calculated numerically for a linear dipole antenna applying the moment method. As a result, the difference of numerical solution by a difference of feed formula was clarified.

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