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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Define the following variables:
- freq = 400e6 (The operating frequency.)
- lambda = c0/freq (The wavelength in free space.)
- lr = 0.477*lambda (Length of the reflector.)
- li = 0.451*lambda (Length of the active element.)
- ld = 0.442*lambda (Length of the directors.)
- d = 0.25*lambda (Spacing between elements.)
- h = 3 (Height of the antenna above ground.)
- epsr = 10 (Relative permittivity of the ground.)
- sigma = 1e-3 (Conductivity of the ground.)
- wireRadius = 1e-3 (Radius of the wire.)
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Create the dipole (driven element) of the Yagi-Uda
antenna.
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Create the reflector of the Yagi-Uda antenna.
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Create the three directors of the Yagi-Uda antenna.
- Create three lines.
Line Start point End point Label 1 (d, -ld/2, h) (d, ld/2, h) director1 2 (2*d, -ld/2, h) (2*d, ld/2, h) director2 3 (3*d, -ld/2, h) (3*d, ld/2, h) director3 - Create a new dielectric called ground with relative permittivity set to epsr and conductivity to sigma.
- Set the lower half space to ground using the exact Sommerfeld integrals.
- Set the frequency to freq.