HFSS15: Incident Gaussian Beam Wave

An incident Gaussian Beam wave propagates in one direction and is of Gaussian distribution in the directions perpendicular to its direction of propagation.

1. Click HFSS>Excitations>Assign>Incident Wave>Gaussian Beam.

2. Select the Vector Input Format as Cartesian or Spherical coordinates.

3. Enter the X-, Y-, and Z-coordinates of the Excitation Location and/or Zero Phase Position (the origin for the incident wave).

4. Click Next.

5. If you selected Cartesian, the Incident Wave Source: Cartesian Vector Setup page appears. Define the propagation vector, k, and the E-field polarization vector, E₀:

a. Enter the X-, Y-, and Z-components for k vector in the X, Y, and Z boxes.

b. Enter the coordinates for E₀ vector in the X, Y, and Z boxes.

A single incident wave will be defined. Continue with Step 8 below.

6. If you selected Spherical, the Incident Wave Source: Spherical Vector Setup page appears.

a. Under IWavePhi, enter Start and Stop points and the number of sweep Points.

Click View Point List to see the values of f.

b. Under IWaveTheta, enter values for Start, Stop, and Points.

Click View Point List to see the values of q.

c. Enter the f and q components of E₀ in the Phi and Theta boxes.

A spherical grid is created when q is swept through each f point. At each grid point, an incident wave is present traveling towards the origin of the coordinate system for the design. The number of incident waves and grid points can be calculated by multiplying the number of f points by the q points.

7. Click Next. The Incident Wave Source: Gaussian Beam Options page appears.

8. Select the Beam Width at Focal Point. By definition, this refers to the radius (w_o) of the beam waist (not the diameter), where the beam waist is the minimum width. To restore the default (10 mm), click the Use Defaults button.

9. Click Finish.The incident wave you defined is added to the Excitations list in the Project.