Defining an Infinite Ground Plane
Define a perfectly conducting (PEC) infinite ground plane. An infinite ground plane is an efficient method to model a large ground plane compared to a discretised, finite sized ground plane.
Define the infinite ground plane.
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On the Construct tab, in the Structures
group, click the
Planes/Arrays icon. From the drop-down list, select 
Plane / Ground.
-
On the Plane / Ground dialog, from the
Definition method
drop-down list, select Perfect electric
(PEC) ground plane at Z=0.
Figure 1. The Plane / Ground dialog. 