关于wire segment radius 设置问题？

为什么我在仿真在一个平面上的两个单极子天线间耦合度时，设置不同的单极子的wire segment radius 中local wire radius 的值时，得出的结果不同且出入很大，请问这是怎么回事?仿真频率为230MHz，，，我的wire segment length设置为（1/12）*lamda，wire segment radius 为五分之一的wire segment length，local wire radius 则更小，但若设的更细的话结果也会随之改变。

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請參考這個準則. 手冊有提到
2.2.2 Meshing guidelines regarding element sizes
During meshing the following general rules should be adhered to:
Segments
• The segment length l should be smaller than a tenth of the free space wavelength.
• Note also that the segment current flows only in the axial direction. Thus segments should not be too short relative to the wire radius. Ideally the segment length should be at least four times the radius.
• When modelling a conductive surface by means of a wire grid, the radius should be chosen so that the wire area in one direction is approximately the same as the area of the original surface. This leads to
r ≈ l/2π , (2-1)
where r is the radius and l is the segment length which should be about a tenth of a wavelength.
• For wire - surface junctions (so called connection points) the radius of the attached wire segment must be small as compared to the size of the triangular patches attached at this connection basis function. As reference for the triangle size, the triangle edges attached to the connection point are used. The length of these edges must be large as compared to the wire segment radius.