Warning 3718:Far field condition not met for near field computation of an impressed radiation pattern point source.
Altair EmployeeAnswers
-
This warning occurs when a radiation pattern point source is used too close to neighbouring geometry. A far field condition distance is calculated for the radiation pattern point source. This varies of course with the antenna size and geometry. In FEKO two distances are calculated.
Firstly, when the distance D is large, the far field condition is calculated as 2*D^2/lambda and the warning is printed when the geometry is within distance D.
Secondly, for small D, the far field condition is calculated as lambda/(2*pi) and the warning is printed when the geometry is within this distance.
When the warning is given, users should be aware that results could be inaccurate.
0 -
"Firstly, when the distance D is large, the far field condition is calculated as 2*D^2/lambda".
__What does D stand for? Usually 2*D^2/lambda is far zone distance and D is radiating aperture size. But if i had a point source with imported pattern (.ffe file), where FEKO get's D??? Or FEKO analyzes width of radiation pattern, freq and estimates D (delta_Theta_deg=51*D/lambda)? Or D is another distance??
__In my case i have point source instead of waveguide array (pattern width is about 10 degrees ). Source mainly radiates in z direction. I placed it inside a hole (diameter about 3 lambda) in the reflector.
Will this affect modeling results, accounting for array radiates primarily in z diection and weekly in xz plane?
0