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目前越来越有必要使用外导体开槽孔的同轴电缆。槽孔保证了沿电缆传输的一定能量的“输出”,以实现与移动体进行无线通讯,或者在一定的控制空间产生必要的电磁场电平。这时对通过一定尺寸、形状和方向的槽孔所产生的电磁场予以确定,是有实际意义的。槽孔尺寸在电气上往往是比较小的,但与电缆外导体半径有可比性。因此,在这种情况下就不能利用有关文献[1、2]所述对称标准密度编织(88～92％)电缆上已成功应用的结果。这一算题的精确解具有很大的难度,究其原因。一是槽孔内电磁场分量分布的复杂性,二是在文献中还未提出过实际可行方式的进展结果。
It is now more and more necessary to use a coaxial cable slotted with an outer conductor. The slots ensure a certain amount of “output” of energy transmitted along the cable for wireless communication with the moving body or for generating the necessary electromagnetic field levels in a controlled space. In this case, it is of practical significance to determine the electromagnetic field generated by the slots of a certain size, shape and orientation. Slot dimensions are often electrically small, but comparable to the radius of the outer conductor of the cable. Therefore, in this case, the results that have been successfully applied to the symmetrical standard density braid (88-92%) described in the literature [1,2] can not be used. Exact solutions to this problem have great difficulty, the reason. The first is the complexity of the distribution of electromagnetic field components in the slot. The second is that no progress has been made in the literature on the practical and feasible ways.