The Electric Currents, Single Layer Shell (ecs) interface (
), which is a legacy interface used to is a legacy interface used to compute electric field, current, and potential distributions in thin conducting shells under conditions where inductive effects are negligible; that is, when the skin depth is much larger than the studied device. It supports stationary, frequency-domain, small-signal analysis, and time-domain modeling on edges in 2D and faces in 3D
Current Conservation is the main node, which adds the equation for the electric potential and provides a Settings window for defining the electrical conductivity as well as the constitutive relation for the electric displacement field and its associated material properties such as the relative permittivity.
When this physics interface is added, these default nodes are also added to the Model Builder—
Current Conservation,
Electric Insulation (the default edge or point condition), and
Initial Values. Then, from the
Physics toolbar, add other nodes that implement, for example, edge or point conditions and current sources. You can also right-click
Electric Currents, Single Layer Shell to select physics features from the context menu.
The Label is the default physics interface name.
The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern
<name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the
name string must be unique. Only letters, numbers, and underscores (_) are permitted in the
Name field. The first character must be a letter.
The default Name (for the first physics interface in the model) is
ecs.
Enter a value or expression for the Shell thickness ds (SI unit: m). The default value is 1 cm.
Select the Activate manual terminal sweep check box to switch on the sweep and invoke a parametric sweep over the terminals. Enter a
Sweep parameter name to assign a specific name to the variable that controls the terminal number solved for during the sweep. The default is
PortName. The generated lumped parameters are in the form of capacitance matrix elements. The terminal settings must consistently be of either fixed voltage or fixed charge type.
The lumped parameters are subject to Touchstone file export. Enter a file path or
Browse for a file. Select a
Parameter format (value pairs) for the Touchstone export —
Magnitude and angle (MA) (the default),
Magnitude in dB and angle (DB), or
Real and imaginary parts (RI). Select an option from the
If file exists list —
Overwrite or
Create new. Select a
Parameter to export —
Z (the default),
Y, or
S.
The dependent variable (field variable) is for the Electric potential V. The name can be changed but the names of fields and dependent variables must be unique within a model.