# 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:
• Set the model unit to millimetres (mm).
• d = 15.2 (The spacing for periodic boundary condition.)
• fmin = 2e9 (The minimum frequency.)
• fmax = 12e9 (The maximum frequency.)
• armLength = 13.3 (The arm length of the cross.)
• armWidth = 1.9 (The arm width of the cross.)
• stubLength = 5.7 (Stub length at the end of the cross.)
• stubWidth = armWidth (Stub width at the end of the cross.)
2. Create the main arm of the cross.
1. Create a rectangle centred at the origin.
• Definition method: Base centre, width, depth
• Base centre: (0, 0, 0)
• Width: armWidth
• Depth: armLength
3. Create the stub rectangle.
1. Create a rectangle centred at the origin.
• Definition method: Base centre, width, depth
• Base centre: (0, 0, 0)
• Width: stubLength
• Depth: stubWidth
4. Translate the stub rectangle as follows:
• From: (0, -stubWidth/2, 0)
• To: (0, -6.65, 0)
5. Copy and mirror the stub across the XZ plane.
There should now be a stub at each end of the main arm.
6. Copy and rotate all the parts by 90°.
7. Union all the parts and simplify Union1.
8. Add a single incident plane wave with θ=0° and ϕ=0°.
9. Set a continuous frequency range from fmin to fmax.