瞬态激励下圆盘轴向电磁能量的流动规律
ELECTROMAGNETIC ENERGY FLOW PATTERN ON THE AXIS OF A CIRCULAR DISK BY TRANSIENT EXCITATION
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摘要: 本文给出了在瞬态均匀电流分布激励下，圆盘轴线上能量衰减的精确解。当激励波形选为矩形脉冲,且 a/c 时，在靠近源的区域内存在一个能量上升阶段，在达到最大值之后能量开始慢衰减，到无穷远处时即成为球面波衰减；无衰减区域是不存在的；能量上升阶段的范围决定于天线的尺寸以及脉冲的宽度。文中还给出了单频信号激励下，轴线附近的功率流线管。单频解表明：在靠近源的区域内存在一振荡区域，其幅度呈上升趋势，与Silver在1949年得出的结论不同。最后对时域能最上升段进行了解释，并对电磁导弹的一些问题进行了讨论。Abstract: The exact energy flow pattern on the axis of a circular disk by transient excitation is presented. It is shown that non-decaying region does not appear when the source is chosen to be a rectangular pulse, on the contrary, there exists a uprising region on the axis when the width of the pulse is less than a/c. After reaching its maximum value, the energy decays slowly until the law of r-2 is met. The scale of the uprising region is dependent upon the size of the antenna and the width of the pulse. The energy flow line tube excited by a harmonic wave is also given. It is also shown that there is a oscillatory region near the source, the amplitude is also uprising, which is quite different compared with the conclusion drawn by S. Silver (1949). Finally, the phenomenon of energy uprising in time domain is explained and some problems about the electromagnetic missiles are also expounded.
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