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Analyzing the near and far field using finite element method

机译：使用有限元法分析近距离场

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In this paper, the railgun is assumed to be an antenna and simulated with finite element method. The caliber of railgun is 10 mm × 10 mm, rail thickness is 10mm and rail length is 400mm. Normally, one assumes that the railgun is operated in the far-field and the near-field region, and radiation patterns are computed in the far-field region where the transmitted wave of the transmitting antenna resembles a spherical wave from a point source that only locally resembles a uniform plane wave. At first, the H-field on the cross section of the rails is computed and shown in figure. Next, power radiation and the maximum value of the E-field in the near and far field are obtained as a function of frequency and shown in the some figures. Polar radiation patterns for versus frequency (1 kHz to 1 MHz) in the near and far field region are calculated as a function of angle and given in the some polar figures. Finally, three dimensional radiation patterns for both regions are shown in the some figures.
机译：在本文中，所述轨道炮被假设为天线和采用有限元法模拟的。轨道炮的口径为10mm×10mm的，轨厚度为10mm和轨道长度为400mm。通常，一个假定轨道炮在远场和近场区域中操作，和辐射图案在远场区域计算，其中发射天线类似于球面波的透射波从点源，只有当地类似于均匀平面波。首先，在轨道的横截面的H场被计算并且在图中示出。接着，功率的辐射，并在近场和远场E场的最大值作为频率的函数获得，并在一些附图中示出。在近场和远场区域相对于频率（1kHz至1MHz的）极化辐射模式被计算为角的函数，并在某些极性附图给出。最后，对于这两个区域的三维辐射图形中示出了一些数字。

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