basic parameters in ie3d for cpw

Im trying to simulate a CPW fed slot antenna which is dual polarized. So I have two ports feeding the antenna. I am trying to figure out my mistakes in setting up my basic parameters (layers) because I keep getting a 100% radiation efficiency. I thought something was wrong with how im meshing it but the efficiency doesnt change when I refine my mesh. Also, I excited the antenna using the method from the manual on Electric current model (differential) for CPW port

I defined the layers as follow:

Ztop = 1e+015 T = 1e+015 Epsr = 1
Ztop = .508 T = .508 Epsr = 3.38
Ztop = 0 Epsr = 1

and I defined my metallic strip with a conductivity of copper

Can anyone help?