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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Create a dielectric medium.
- Label: RogersDuroid5870
- Relative permittivity: 2.2
- Dielectric loss tangent: 0.0012
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Add a planar multilayer substrate (infinite plane) with a conducting layer at
the bottom.
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Select Plane / ground.
- Click Planar multilayer substrate.
- Thickness (Layer 1): 2.5e-3
- Medium (Layer 1): RogersDuroid5870
- Ground plane (Layer 1): PEC
- Z value at the top of layer 1: 0
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Select Plane / ground.
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Create the patch.
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Create a rectangle.
- Definition method: Base centre, width, depth
- Base centre (C): (0, 0, 0)
- Width (W): 39e-3
- Depth (D): 39e-3
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Create a rectangle.
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Create the inset feeds.
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Create a rectangle.
- Definition method: Base corner, width, depth
- Base centre (C): (-1.4e-3, -39e-3/2, 0)
- Width (W): 2.8e-3
- Depth (D): 6.5e-3
- Label: InsetRectangleLarge
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Create another rectangle.
- Definition method: Base corner, width, depth
- Base centre (C): (-1.4e-3/2, -39e-3/2, 0)
- Width (W): 1.4e-3
- Depth (D): 6.5e-3
- Label: InsetRectangleSmall
- Union InsetRectangleSmall with InsetRectangleLarge.
- Copy and rotate the Union by 90 degrees.
- Union all the parts in the tree.
- Delete the two face pairs from the newly created Union1 to complete the inset feeds.
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Create a rectangle.
- Create two microstrip ports on the outer edges of the inset feeds, one port for each feed.
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Create a new network.
- Data type: S-matrix
- Source: Touchstone file
- Number of network terminals: 3
- Browse for the .s3p file.
- Connect the input ports of the patch to the output ports of the network in the schematic view.
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Add a voltage source to GeneralNetwork1.Port1
Note: The voltage source will not be displayed in the schematic view.
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Set the frequency.
- Continuous (interpolated) range
- Start frequency (Hz): 0.8*2.4e9
- End frequency (Hz): 1.2*2.4e9
Note: No output requests are necessary. The intput impedance of the voltage source is computed automatically.