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.
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Define the following variables:
- freq = 100e6 (The operating frequency.)
- d = 0.004 (Plate thickness.)
- a = 2 (Width of plate.)
- b = 1 (Depth of plate.)
- epsr = 7 (Relative permittivity.)
- tand = 0.03 (Loss tangent.)
- thetai = 20 (Zenith angle of incidence.)
- phii = 50 (Azimuth angle of incidence.)
- etai = 60 (Polarisation angle of incident wave.)
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Create the thin dielectric sheet.
- Create a dielectric with the relative permittivity set to epsr, dielectric loss tangent to tand. Rename its label to substrate.
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Create a single-layered dielectric.
- Label: thin_dielsheet
- Thickness: d
- Dielectric material: substrate
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Create a rectangular plate centered at the origin in the XY plane.
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Create a rectangle.
- Definition method: Base centre, width, depth
- Base centre: (0, 0, 0)
- Width: a
- Depth: b
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Create a rectangle.
- Set the face medium of the rectangular plate to thin_dielsheet.
- Add a single incident plane wave source from direction θ=thetai and ϕ = phii. Set the polarisation angle to etai.
- Set the frequency to freq.
The model geometry is symmetric about the 3 principal axes, but the source is not symmetrical.
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Specify the symmetry about 2 principal planes:
- X=0: Geometric symmetry
- Y=0: Geometric symmetry
Tip: Exploit model symmetries (if it exists) in a large or complex model to reduce computational costs.