进而结合实际的天线结构，运用矩量法计算了金属盒大小对天线阻抗和方向图的影响。

Then the impacts of metal case size on the input impedances and patterns of antennas are discussed with the moment method.

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本文在矩量法计算曲面偶极子特性数据的基础上对方向性系数进行了优化，得到了曲面偶极子方向性系数的最大值。

Based on the calculation of the characteristic parameters of curved surface dipoles by moment method, the directivities are optimized, the maximum directivities of curved surface dipoles are obtained.

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本文利用钻头不同位置不同方向的惯性矩和挠曲对其弯曲刚性进行解析。

This paper by means of different locations inertia moment of different directions and bending of the drill, analyses its bending rigidity.

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