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 the following variables.
- freq = 1.654e9 (The operating frequency.)
- lambda = c0/freq (The wavelength in free space.)
- n = 10 (number of turns for the helix.)
- helix_alpha = 13 (pitch angle of the helix.)
- helix_radius = lambda*cos(helix_alpha*pi/180)/pi/2 (radius of the helix.)
- plate_radius = 0.75*lambda (radius of the ground plate.)
- wire_radius = 0.65e-3 (radius of the helix wire segments.)
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Create the circular base plate of the helix.
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Create the helix
- Definition method: Base centre, radius, pitch angle, turns
- Origin: (0, 0, 0)
- Radius: helix_radius
- Pitch angle: helix_alpha
- Number of turns: n
- Union the helix and ellipse.
- Add a wire port to the start of the line.
- Add a voltage source to the port. (1 V, 0°, 50 Ω).
- Set the frequency to freq