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.
- Set the model unit to centimetres.
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Define the following variables:
- freq = 1.645e9 (The operating frequency.)
- lambda = c0/freq * 100 (The wavelength in free space.)
- wa = 12.96 (The width of the waveguide.)
- wb = 6.48 (The height of the waveguide.)
- ha = 55 (The width of the horn.)
- hb = 42.8 (The height of the horn.)
- wl = 30.2 (The length of the waveguide section.)
- fl = wl - lambda/4 (The position of the feed wire in the waveguide.)
- hl = 46 (The length of the horn section.)
- pinlen = lambda / 4.56 (The length of the pin.)
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Create the waveguide section.
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Create a cuboid.
- Definition method: Base corner, width, depth, height
- Base corner (C): (-wa/2, -wb/2, -wl)
- Width (W): wa
- Depth (D): wb
- Height (H): wl
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Create a cuboid.
- Delete the face coincident on the UV plane.
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Create the horn section.
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Create a flare.
- Definition method: Base centre, width, depth, height, top width, top depth
- Bottom width (Wb): wa
- Bottom depth (Db): wb
- Height (H): hl
- Top width (Wt): ha
- Top depth (Dt): hb
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Create a flare.
- Delete the face at the origin and the face opposite to that.
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Create the feed pin.
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Create a line.
- Start point: (0, -wb/2, -fl)
- End point: (0, -wb/2 + pinlen, -fl)
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Create a line.
- Add a wire port (segment) to the base of the line.
- Add a voltage source to the port. (1 V, 0°, 50 Ω).
- Union all parts.
- Set the total source power (no mismatch) to 5W.
- Set the frequency to freq.
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Specify the symmetry about the X=0
plane as Magnetic symmetry.
Tip: Exploit model symmetries (if it exists) in a large or complex model to reduce computational costs.