Analysis of aperture antenna radiation characteristics fed by impulse signal on time domain

The influence of equivalent surface currents was introduced and the farfield directivity was amended which was more adaptive to describe the aperture radiation characteristics. It was concluded that wide impulse, small aperture, severe tapered field in aperture, or obvious spherical wavefront would lead to bad directivity. By holding the spherical wavefront in proper extent, it could achieve a farfield with flat lobe around boresight and sharp falling at certain angle. By investigating the radiation characteristics of different aperture in time domain, it was easier to analyze the practical impulse antenna in a short time.