[建模]关于CST中材料设置问题

大家在设置新材料的时候只是设置相对介电常数吗？损耗角正切呢？设置损耗角正切是写的要在某一个频点下，但是在整个频带下都是常数怎么弄 .. tB0f+ wC  
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节录自CST 自带 Help... h(J$-SUs  
Const. fit tan delta:  This specification is based on a pole-zero dispersion model, defined again by the input of an electric tangent delta value given at the defined frequency and by the model order. %hw4IcWJ|  
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The first order corresponds to a Debye dispersion whereas higher order models are specifically developed to fit a broadband constant imaginary part of the permittivity. They are particularly suitable for low losses (low tangent delta value) materials. As mentioned above, at this frequency point the real part of the permittivity equals the epsilon input on the Material Parameter - General page. {D :WXvI  
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If the User order checkbox is activated the model order will be selected according to the user choice. If the checkbox is deactivated the model order will be automatically determined by the fitting algorithm, selecting the best choice between optimal approximation and smallest possible number of poles. }~ N\A  
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Please note that a perfectly constant tangent delta does not exist in reality; however, the broadband behavior of this formulation represents an almost constant tangent delta curve "L1LL iS  

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不懂，帮顶了