Impedance as function of frequency
Altair EmployeeAnswers
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Hello @RG888,
I would suggest that you look at the Getting Started Guide and the Examples Guide for some help on learning about the basic mechanics of how to use FEKO. Specifically,
- 'Examples Guide A-1: Dipole example' will give you an example of a dipole
- 'Examples Guide A-7: Log Periodic antenna' will give you an example of how to plot impedance over frequency
I hope that helps!
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Andries
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Hello andries,
Thank you for your suggestions. Yes example guide is good way .
Finally, I got the plot .
Thanks
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Altair Forum User said:
Hello @RG888,
I would suggest that you look at the Getting Started Guide and the Examples Guide for some help on learning about the basic mechanics of how to use FEKO. Specifically,
- 'Examples Guide A-1: Dipole example' will give you an example of a dipole
- 'Examples Guide A-7: Log Periodic antenna' will give you an example of how to plot impedance over frequency
I hope that helps!
Andries
__Hello dear Altair Feko staff. In FEKO exhamples guide, you consider thin dipole (radius/length=1/1000), working at roughly 75 MHz frequency. It is well known, that 'such a dipole has a feedpoint impedance consisting of 73 Ω resistance and +43 Ω reactance' (from wiki). But in your exhamples guide i see
real part imag. part magnitude phase
Impedance in Ohm 7.8729E+01 3.6658E+01 8.6845E+01 24.97__So in manual Re(Z)=78.7 Ohm and this number differ's from theory. I improved mesh (from 'standard' to 'fine') and performed simulation. I expected Re(Z) to be closer to 73 Ohm. But i've got 81.9 Ohm (see picture below). Can you explain me why can't i approach 73 Ohm value.
__PS: I am still using old version of FEKO 7.0. May be this is the problem....
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