Ok, I have simulated your DXF with two different solver methods:
- full 3D EM using FDTD with Enpire XPU
- planar MoM using ADS Momentum
and get very similar results. In both cases, a fine mesh was used. I have long experience with both tools and consider my results accurate, based on the DXF contents and your substrate specification.
Your DXF has some strange distortion, is that correct? The patches are not oriented exactly along the xy-axis, so I wonder if your DXF export from 3D was done at some angle/perspective? But anyway, based on the actual DXF contents, results are solver-independent.