The Surface Current Sensor Definition allows users to collect either transient or steady-state data. A definition must accompany a surface current sensor in order to specify where the data will be collected. The equations for transient and steady-state surface currents are

\begin{eqnarray} J_s(t) &=& \hat n\times H(t) \\ \tilde {J_s} &=& \hat n\times \tilde H \end{eqnarray}where

$J_s(t) = $ time-domain surface current

$H(t) = $ time-domain magnetic field tangent to the outside of the surface

$\tilde {J_s} = $ frequency-domain complex surface current phasor

$\tilde H = $ frequency-domain complex magnetic field phasor tangent to the outside of the surface

$\hat n = $ surface normal

Users can access the Surface Current Sensor Definition Editor by either right-clicking on the Definitions branch of the Project Tree and selecting New Surface Current Sensor Definition, or double-clicking on an existing definition in the Project Tree.