The Uniform Element is available in 3D. When the Type of lumped port is set to Multielement uniform under Lumped Port Properties, this subnode is available from the context menu (right-click the Lumped Port parent node) or from the Physics toolbar, Attributes menu.

Enter a unique Uniform element name. Enter values or expressions in the fields — Direction between uniform element terminals ah. The Direction between uniform element terminals defines the electric potential polarity, as ah points in the direction of the electric field.