Relative permittivity of gold at radio-frequencies

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What is the relative permittivity of gold at radio-frequencies or specifically around 15-20MHz?
 

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Born2bwire
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Model it as a PEC, if you really want to be specific though, wikipedia gives the conductivity as being 45.2 mega-mhos. The conductivity and permittivity will probably not change until you get into the terahertz range. Then, some metals, like silver I know, will behave as a plasma.
 

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