Use the Lumped Port node to apply a voltage or current excitation of a model or to connect to a circuit. A lumped port is a simplification of the port boundary condition.
Enter a unique Lumped 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 User defined for nonuniform ports, for example, a curved port and enter values or expressions in the fields —
Height of lumped port hport (SI unit: m),
Width of lumped port wport (SI unit: m), and
Direction between lumped port terminals ah.
Select Via for excitation or termination of a cylindrical shape of a structure used in a metalized via that is a plated through hole.
For the Terminal type — a
Cable port is available for a voltage driven transmission line and S-parameter calculation.
For Cable, select
On or
Off from the
Wave excitation at this port list to set whether it is an inport (excitation) or a listener port (observation).
If On is selected for the
Wave excitation at this port, select
Voltage or
Power from the
Source type. For the
Voltage source type, enter a
Voltage V0 (SI unit: V), and
Port phase θin (SI unit: rad). For the
Power source type, enter a
Power P0 (SI unit: W) that is the average input power to the lumped port.
Note it is only possible to excite one Cable port at a time if the purpose is to compute S-parameters. In other cases, for example, when more than one inport might be wanted, but the S-parameter variables cannot be correctly computed so if several ports are excited, the S-parameter output is turned off.
The Port Sweep Settings cycle through the ports, computes the entire S-matrix, and exports it to a Touchstone file. When using port sweeps, the local setting for
Wave excitation at this port is overridden by the solver so only one port at a time is excited.