Problem with the creation of an isotropic antenna.

User: "Student_21133"
Student_21133
Altair Community Member
Updated by Student_21133

Hello,

I have a problem with the creation of an isotropic antenna.

Feko does not have a native isotropic antenna model, so I created the attached file ("Isotropic Antenna.txt" with a ".ffe" extension) which defines a far field antenna radiating everywhere:

- Re(Etheta) = 1

- Im(Etheta) = 0

- Re(Ephi) = 1

- Im(Ephi) = 0

I was waiting for a perfect spherical radiating diagram, but when I make this antenna radiating by launching the Feko solver, I obtain the attached images : a magnitude artefact at theta=0 for Etheta and Ephi, and an ugly result for the total electric field.

Would anyone have any thought about this ?

Thnak you in advance.

E_Phi_Magnitude.jpg
E_Phi_Phase.jpg
E_Theta_Magnitude.jpg
E_Theta_Phase.jpg
E_Total_Magnitude.jpg
Isotropic Antenna.txt

Find more posts tagged with

English
Feko
v2022.1
Sort by:
1 - 2 of 21
    User: "Torben Voigt"
    Torben Voigt
    Altair Employee
    Accepted Answer
    Updated by Torben Voigt

    Hi @Student ,

    This is a problem of the display. Feko sees tiny differences and wants to show them. You can simply set the Individual Range to e.g. 1.41 - 1.42 and you should have a smooth image:

    image

    Best regards,
    Torben

    User: "Student_21133"
    Student_21133
    Altair Community Member
    OP
    Updated by Student_21133

    Thank you very much for your answer.

    It works well and I now have a smooth image.
    But I still find it strange that Feko computes a variable total field value while having the same Etheta and Ephi in any direction as input data.

    Thank you again. 

Quick Links