Slowly Decreasing Property of Ultra-Wide Band Pulse

Under transient excitation the energy transmitted by an antenna of finite size to a faraway receiver can decrease much more slowly than the usual R-2. With circular radiating antenna, the analytical and numerical results of axial energy of Gauss pulse are offered by electromagnetic theory. According to uniform current distribution model, the character of axial radiation of disk radiator is divided to none-decreasing region, slowly decreasing region, and fast decreasing region. The slowly decreasing property of electromagnetic wave is confirmed through experiment. With comparison, the theoretical result well agrees with the experimental result.