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.
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If a Cable port type is selected under Port Properties, enter the Characteristic impedance Zref (SI unit: Ω). The default is 50 Ω.
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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:
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Electric potential V0 (SI unit: V). The default is 1 V.
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Port phase θin (SI unit: rad). The default is 0 radians.
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S-Parameters and Ports
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Lumped Ports with Voltage Input
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Theory for the Transmission Line Boundary Conditions