To see the effect of a metasurface on an incident plane wave, I can use E Field& H field monitor for near field in frequency domain solver with unit cell boundaries and floquet port excitation. But to have far field, I can use farfield/RCS monitor if I can exclude sidewalls, based on :

https://space.mit.edu/RADIO/CST_online/mergedProjects/3D/special_postpr/special_postpr_pp_farfield.htm

section:

Farfield Contribution of Unit Cells / Periodic Structures

but I don't know how to exclude sidewalls.

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