HFSS15: Infinite Ground Planes

To simulate the effects of an infinite ground plane, select the Infinite ground plane check box when setting up a perfect E, finite conductivity, or impedance boundary condition. The selection only affects the calculation of near- and far-field radiation during post processing. The 3D Post Processor models the boundary as a finite portion of an infinite plane.

Conceptually, a boundary condition designated as an infinite ground plane divides the problem region into the half above it, where the entire model resides, and the half below it, where the radiated fields are set to zero. Antenna parameters involving radiated power will be consistent with these properties.

Lossy ground planes may be approximated by selecting the Infinite ground plane check box when assigning a finite conductivity or impedance boundary. The effects of these boundaries are incorporated into the field solution in the usual manner, but the radiated fields in the 3D Post Processor are computed as if the lossy ground planes were perfectly conducting.

When defining an infinite ground plane, keep the following requirements in mind:

• An infinite ground plane in a model must be exposed to the background.

• An infinite ground plane must be defined on a planar surface.

• The total number of infinite ground planes and symmetry planes cannot exceed three.

• All infinite ground planes and symmetry planes must be mutually orthogonal.

• For impedance, layered impedance, or finite conductivity boundaries only one infinite ground plane can exist in a design. For perfect E boundary conditions, multiple antenna ground planes are supported