In most cases, it is not recommended to include the interior of good conductors in the simulation. When using the Terminal on the domain level, the interior unknowns for the electric potential are automatically replaced by a single constant, thus avoiding numerical problems arising from a very high material contrast. If one instead uses the Terminal on the boundary level, it is recommended to exclude the interior of the associated conductor from the domain selection for the main Electrostatics node.
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Charge to prescribe the total charge deposited on the terminal boundaries. Enter the total charge Q0. The default is 0 C, which corresponds to a uncharged floating electrode.
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Voltage to specify a fixed electric potential at the terminal. Enter an electric potential V0. The default is 1 V.
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To correctly calculate the terminal charge and the corresponding capacitances, if Voltage Terminal is used on boundaries between The Electrostatics Interface and The Electrostatics, Boundary Elements Interface, let the dependent variable for The Electrostatics, Boundary Elements Interface be the same as the dependent variable for The Electrostatics Interface and disable Electric Scalar-Scalar Potential Coupling. How to set the name for the dependent variable is described in the Dependent Variables section. Since the Electric Scalar-Scalar Potential Coupling is disabled, add manually a Fully Coupled node to the Stationary Solver below the Solution node in the Solver Configurations.
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Circuit to specify a terminal connected to an Electrical Circuit physics interface that models an external circuit. The Terminal node provides a current-voltage characteristic to the circuit.
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The Electrical Circuit Interface requires a current from the Terminal, so the Circuit terminal type can only be used in Time Dependent or Frequency Domain studies, in which the current can be computed as the time derivative of the charge.
The Circuit type cannot be used together with a terminal sweep.
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Terminated to connect the terminal to an impedance that might represent a load or a transmission line. When Terminated is selected, the scattering parameters (S-parameters) are computed. The Terminated setting can only be used in frequency-domain studies.
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Enter a Terminal power P0 to specify the input power at this terminal from the transmission line. This excitation can be toggled using a port sweep.
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Select an option from the Characteristic impedance from list to define the value of the impedance — Physics interface or User defined. For Physics interface the Reference impedance Zref defined on the Settings window for the physics under Sweep Settings is used. For User defined enter a specific impedance Zref for this terminal. The default is 50 Ω.
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Studies and Solvers in the COMSOL Multiphysics Reference Manual
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For a voltage terminal type example, see Dielectric Shielding Comparison: Application Library path ACDC_Module/Capacitive_Devices/dielectric_shielding_comparison.
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