Defining the Excitation

Accessing Excitation Settings

Navigate to:
Setup tab > Excitation panel
Two excitation types available (Fig. 1):

1. Discrete Sources
2. Incident Field

Discrete Sources

• Purpose: Calculate current distribution using voltage/current sources on wires
• Power Configuration:
  • Specified Input Power: Sources auto-adjust to achieve target power (Watts)
  • Unspecified Power: Sources remain constant; power becomes output result

Incident Field (Plane Wave Excitation)

Define an incident plane wave’s direction and polarization:

Key Parameters

Parameter	Description	Units/Values
E-Field Major Axis	Linear: RMS amplitude (V/m) Elliptical: Major axis of polarization ellipse	V/m
Axial Ratio	Minor/major axis ratio: – Positive: Right-handed ellipse – Negative: Left-handed ellipse – Zero: Linear polarization	Unitless
Phase Reference	Phase shift at coordinate origin	Degrees
Gamma	Linear: Polarization angle from incidence plane Elliptical: Major axis angle from incidence plane	Degrees
Theta	Zenith angle of incidence	Degrees
Phi	Azimuth angle of incidence	Degrees

3D Visualization

Click 3D View (Fig. 3) to interactively set:

• Wave direction
• Polarization state

Note

When an incident plane wave is used as the excitation, any discrete sources present will be ignored during the simulation.

Note

When an incident plane wave is used as the excitation, the calculated far-field and near-field results represent the scattered fields. The resulting radiation pattern is the scattered field pattern, observed in the far-field region where the scattered field amplitude decays with the inverse of the distance (1/r), and the scattered power density decays with the inverse square of the distance (1/r²) from the structure.