Lumped Port
Use the Lumped Port node to apply a voltage or current excitation to a domain.
Port Properties
Enter a unique Port Name. It is recommended to use a numeric name.
Select a Type of Port — Cable (the default), Current, or Circuit.
If a Cable is selected as the port type, select the Wave excitation at this port — On (the default) or Off. Select On to apply a voltage excitation to a domain.
If On is selected as the Wave excitation at this port, select the Voltage source type for the input Electric potential Vin (SI unit: V) — Sinusoidal (the default) or User defined.
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If a Sinusoidal type is selected as the Voltage source type, enter the Frequency f0 (SI unit: Hz) and Amplitude V0 (SI unit: V). The default Frequency is 1 GHz and the default Amplitude is 1 V.
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If an User defined type is selected under Voltage, enter the expression for the input Electric potential Vin (SI unit: V). The default expression is sin(2πf0t) V where f0 is 1 GHz
Settings
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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 the expression of a Terminal current Iin (SI unit: A). The default expression is sin(2πf0t) A where f0 is 1 GHz.
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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, Transient Boundary Conditions