[求助]XFDTD中的Wire和Port设置问题

XFDTD中的Wire和Port具体作用是什么，设置的依据是什么。比如我要仿真一个周期性金属网格的电磁波透过率，该如何 .. H?$gHZPI  
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周期性金属网格仿真，最好考虑线金属模型的FDTD，不知XFDTD有这个功能没有？

请教一下什么是线金属模型的FDTD，有参考资料吗？谢谢

关于wire模型，就是一种理想导体金属线，XFDTD可以设置不同粗细的wire—— -~ H?R  
出处：XFDTD 6.3 ReferenceManual.pdf ]BaK8mPl  
Thin Wires |SuN3B4e  
Thin wire materials may be used in special situations where a wire with a radius much M+-1/vR *@  
smaller than the cell size is required.  In most cases, material #1 (PEC), will serve well ,
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as a wire.  However, in cases where the wire radius is important to the calculation and is xbD]EC  
less than approximately 1/5 the cell size, the thin wire material may be used to /dwj:g0y  
accurately simulate the correct wire dimensions.   BjV;/<bt  
Thin wire materials are subject to several restrictions due to the special modifications +%?\#EQJ  
they require on the field update equations. Thin wires may not meet at 90 degree angles 1-~sj)*k  
and they may not be located on adjacent cell edges. There must be a minimum of one ,$bK)|pGV  
non-thin wire cell between any two adjacent thin wire cells.   Attaching thin wire materials (x140_TH~  
end-to-end is the desired method of using this material type.   !XQ
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If a feed or port will be connected to a thin wire, the cell edge at the feed should also be X.[8L^ldh  
thin wire material, not free space.  For example, if a dipole antenna is simulated in thin gp NAM"  
wire material, the feed "gap" should also be thin wire. Failing to use thin wire material in )M_|r2dDq3  
the feed gap will lead to incorrect impedance and gain results. If you do add a feed or oD=+  
port to thin wire materials, you may not specify inductance or capacitance values to that N7-LgP  
port because these will interfere with the thin wire calculation.  However, resistor values aPm2\Sq$  
(series or parallel) may be used. %:yVjb,Yf  
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关于wire上的port设置，一定要直接在金属wire上的网格直接设置port

十分感谢楼上版主的指导。请教一下，Port的作用是什么，仿真电磁场的传播为什么要设置它？