Lumped Port
Use the Lumped Port node to apply a voltage or current excitation of a model or to connect to a circuit. The Lumped Port node also defines S-parameters (reflection and transmission coefficients) that can be used in later postprocessing steps.
Port Properties
Enter a unique Port Name. It is recommended to use a numeric name as it is used to define the elements of the S-parameter matrix and numeric port names are also required for port sweeps and Touchstone file export.
Select a Type of Port — Cable (the default), Current, or Circuit.
Settings
If a Circuit port type is selected under Port Properties, this section does not require any selection.
•
If a Cable port type is selected under Port Properties, enter the Characteristic impedance Zref (SI unit: Ω). The default is 50 Ω.
•
If a Current terminal type is selected under Port Properties, enter a Terminal current I0 (SI unit: A). The default is 1 A.
If Cable is selected as the port type, select the Wave excitation at this port checkbox to enter values or expressions for the:
•
Electric potential V0 (SI unit: V). The default is 1 V.
•
Port phase θin (SI unit: rad). The default is 0 radians.
Selected Signal Conductor Line
This section is available only if the Number of signal conductor lines is greater than one. Select an Active line from the available options to which the boundary condition is applied. The selectable items correspond to the Number of signal conductor lines and Dependent Variables settings.
•
S-Parameters and Ports
•
Lumped Ports with Voltage Input
•
Theory for the Transmission Line Boundary Conditions