resistive materials - mode supressors

Hello,

I am trying to analyze in CST a waveguide assembly which includes a resistive card made of a material which has a resistivity of 150 ohm/square.

How do I define the material properties?

Any suggestion would be appreciated.

Thanks

Kato01

I think you can define it as a thin sheet of lossy metal and set its conductivity so that its surface resistance is equal to 150 Ohms ( I do not remember the equation but I think Rs = sqrt(w * mu/(2*sigma))