The aperture field distribution of the ring focus antenna is reviewed in view of the energy conservation law, and the simple formula for calculating its radiation pattern is deduced.

该文从能量守恒观点出发，讨论了副面为椭圆的环焦天线的口径场分布，并导出了计算其方向图的简单表达式。

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When a target is placed in the focal plane of a focused aperture antenna, the backscattered power from the target may be greatly enhanced by properly choosing the aperture distribution.

当目标处于聚焦天线焦平面上时，可通过选择口径分布来提高目标的后向散射功率。

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For the focusing current distribution over the antenna aperture, the authors have got the field distribution diagrams of the focus and around it.

对于天线口面上的聚焦电流分布，求得了聚焦点及其周围附近的场分布。

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