Creating the Model

Create the model in CADFEKO. Define any ports and sources required for the model. Specify the operating frequency or frequency range for the model.

  1. Define the following variables:
    • lambda = 20 (The wavelength in free space.)
    • freq = c0/lambda (The operating frequency.)
    • radius = 1 (Sphere radius.)
    • epsilon = 36 (Relative permittivity.)
  2. Create a new dielectric labeled diel with relative permittivity set to epsilon.
  3. Create a sphere.
    • Definition method: Centre, radius
    • Centre: (0, 0, 0)
    • Radius: Radius
  4. Set the region of the sphere to diel.
  5. Add a single incident plane wave with θ=180° and ϕ=0°.
  6. Set the frequency to freq (15 MHz)

The geometry is symmetric about the 3 principal planes, but the source is not symmetrical. The electric fields of the incident plane wave are purely X directed for the chosen incident angle.

  1. Specify the symmetry about 3 principal planes:
    1. X=0: Electric symmetry
    2. Y=0: Magnetic symmetry
    3. Z=0: Geometric symmetry
    Tip: Exploit model symmetries (if it exists) in a large or complex model to reduce computational costs.