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RCS of a infinite flat metal plate using HFSS 11

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mideoguns

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hfss rcs plate

Hi All,
I'm using HFSS 11 to simulate a infinite flat metal plate. I've created a unit cell, defined master slave boundaries and floquet ports. I parametised the theta scan angle. The problem I'm having is that independent of the incident angle I get reflection coefficient magnitude of 1 for both TM and TE polarizations, which should only happen at normal incidence. Can anyone suggest what I'm doing wrong? I attach the project. Thanks
 

Did you define the metal by a Drude model? Normally metals are modeled in CST as perfect conductors.
 

I did not use the Drude model, I just defined a metal as normal in HFSS i.e a metal of finite conductivity. A look at the boundary solver view shows only the surface is highlighted as expected since there is no need for meshes inside the metal. I thought the drude model had to do with the conductivity of the metal rather than the scattering?
The interesting thing is if I put a dielectric in place of the metal, the reflection and transmision matches theory results obtained using fresnel equations.
 

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