HIgh impedance surface with ADS

R u looking for how to model that 3D structure in ADS ?

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I don't have much of an idea about High impedance surfaces, But if u can show me the structure that u wish to simulate, den i can give u the steps to follow.. ADS is a 2.5D simulator and is good for planar circuit design. Unless u need a MOM solution for ur 3D structure, I suggest u try HFSS which gives better results for 3D structure..!