Define an aperture or slot in a ground plane using aperture triangles.
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Select the face where you want to apply the aperture triangles.
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From the right-click context menu, select
Properties.
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On the Face properties dialog, click the
Solution tab.
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Under Solve with special solution method, in the
drop-down list select Planar Green's function
aperture.
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Click the OK to apply the aperture triangles and
to close the dialog.