For ports, driven modal case

• The excitation's magnitude specifies time-averaged incident power in watts.
• If you are using a symmetry plane, remember to scale the input signal appropriately. For example, if you have one symmetry plane, use an input value of 0.5 watts to excite the full structure with 1 watt; if you have two symmetry planes, use an input value of 0.25 watts to excite the full structure with 1 watt, and so forth.
• Generally, use the default value of 1. This specifies that the solution's E- and H-fields be scaled such that the excitation wave delivers 1 watt of power. To view the solution at some other power, enter a positive value.
• Only port-mode combinations with non-zero magnitudes will be used.

For voltage and current sources

• The source magnitude for voltage and current sources specifies peak value volts and peak value amperes, respectively.
• If you have defined multiple voltage and current sources, you can "remove" them by setting their magnitudes to 0. This enables you to easily observe the effects that individual or specific groups of sources have on the problem.

For incident waves

• Source magnitude specifies peak value E-field in volts per meter.
• When you scale the incident E-field, the scattered E-field and the total E-field are scaled as well.
• This scaling factor affects all incident angles in the incident wave setup.

For ports, driven terminal case

• The excitation's magnitude specifies peak value volts. This is the sum of the incident and reflected waves at this terminal. See the equations here.

For Eigenmodes

• Source magnitude is unitless and represents a relative value.
• When you enter a scaling factor for an eigenmode the relative source magnitude is amplified by this value. Exactly one eigenmode must be excited by setting its scaling factor to a non-zero positive number.

Ports of Transient Network solutions

• See Ports and Edit Sources Behavior for Transient Network