This report describes the development of two methods of deter-mining the on-axis microwave power density in both the Fresnel and Fraunhofer regions, for circular-aperture antennas with any arbi¬trary, axial1y symmetric aperture illumination. Both methods have been programmed for digital computation. These methods are described and are applied to a number of different aperture distributions which could conceivably occur in practice. The resultant on-axis fields are compared and some conclusions relating the aperture distribution and the resulting on-axis fields-are made.
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