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 Millimetres.
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Define the following variables.
- epsr = 2.62 (The relative permittivity of the substrate.)
- patch_rad = 17.5 (The radius of the patch.)
- line_len = 79 (The length of the strip line.)
- line_width = 4.373 (The width of the strip line.)
- offset = 0 (The distance between the patch centre and the feed line.)
- substrate_d = 3.18 (The height of the substrate.)
- f_min = 2.8e9 (The minimum frequency.)
- f_max = 3.2e9 (The maximum frequency.)
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Create a dielectric medium.
- Dielectric loss tangent: 0
- Relative permittivity: epsr
- Label: substrate
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Create the circular patch.
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Create an ellipse.
- Centre point: (0, 0, 0)
- Radius (U): patch_rad
- Radius (V): patch_rad
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Create an ellipse.
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Create the feed line.
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Create a rectangle.
- Definition method: Base corner, width, depth.
- Base corner: (-line_width/2, 0, -substrate_d/2).
- Width (W): line_width
- Depth (D): line_len
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Create a rectangle.
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Add a planar multilayer substrate (infinite plane) with a conducting layer at
the bottom.
- Add a Plane / ground.
- Click Planar multilayer substrate.
- Thickness (Layer 1): substrate_d
- Medium (Layer 1): substrate
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Create a microstrip port
- Click on the short edge (beginning) of the feed line.
- Add a voltage source to the port. (1 V, 0°, 50 Ω).
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Set the frequency.
- Continuous (interpolated) range
- Start frequency (Hz): f_min
- End frequency (Hz): f_max
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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.