Why can't wires cross in NEC (Method of moments code)?
时间：03-30
整理：3721RD
点击：
I know with NEC, two wires must not cross. If you want them to cross at a point x1,y1,z1, then all wires passing trough the point x1,y1,z1 must either start or finish there. So for example, to have two wires cross, one would need to split each wire into two, so one has 4 wires, all joining at x1,y1,z1 and not two wires that cross there.
I don't know if this is mainly a limitation of how NEC was written, or there's a good fundamental reason the method of moments can't handle such a situation.
I can think of issues where the assumptions made in the MoM will be invalid if the wires cross. For example, charge is assumed to be uniformily distributed around the wire, but if a wire cross another wire, then that wont be true. But if insead of crossing, the wires are joined at a point, then NEC is happy.
I'm just trying to work out in my own mind exactly what the limiting factor is. It is a limition of NEC or the MoM? If the latter, what is the reason the MoM breaks down in such a case?
Dave
I don't know if this is mainly a limitation of how NEC was written, or there's a good fundamental reason the method of moments can't handle such a situation.
I can think of issues where the assumptions made in the MoM will be invalid if the wires cross. For example, charge is assumed to be uniformily distributed around the wire, but if a wire cross another wire, then that wont be true. But if insead of crossing, the wires are joined at a point, then NEC is happy.
I'm just trying to work out in my own mind exactly what the limiting factor is. It is a limition of NEC or the MoM? If the latter, what is the reason the MoM breaks down in such a case?
Dave