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中文摘要：
在瞬态激励下,通过有限尺寸的天线辐射到远端的电磁能量可以比通常的按距离二次方衰减规律更慢。根据电磁理论,给出了平面圆形单元辐射器在亚纳秒高斯脉冲激励条件下,轴线能量传播特性的解析计算公式和数值模拟结果。按照均匀电流分布模型,将平面圆形单元辐射器的轴线辐射分为不衰减段、慢衰减段和快衰减段三部分。通过实验,直接验证了电磁波的慢衰减特性,在实验误差范围内,理论计算与实验结果能较好符合。
英文摘要：
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.
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