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Showing results for tags 'nearfield'.
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Hi all, I wanted to understand how the far field from a near field response from another simulation works. I have a circular waveguide junction problem where I find the aperture field distribution and make it the input of the next simulation as a source to find the far field from it. I have put a PEC surface around the near field source (Not above or below) so that the near field acts as a slot (magnetic virtual current source). I expected to see radiation towards both half of the space but I see on one side like as if there is a PEC surface below that too. However, for some other configuration I do see some radiation towards the other half space. I wanted to understand what exactly happens. I am attaching both models. circular_2wg_10modes_FF_from_NF.cfx circular_5wg_10modes_FF_from_NF.cfx
Hello, I am a Feko 2017.1 user. I have a Cartesian surface plot of near field (electric field) (horizontal axis is X, vertical axis is Y, and Z position is fixed). How can I export the data points of this configuration in dat or txt format for post-processing? Please advise. Thanks in advance.
What are the reasons, why the reflected coefficient (Er/Ei) is too law? Can it be because of reflection coefficient is per definition the maximum amlitude of Er devided to maximum amplitude of Ei and my scattered near field at that point is not necessarily equal to the max. Amplitude. (i have drawn it in the picture with Vin and Vref) ------ I calculated only scattered near field. r - reflected, i -incident I have three mediums, the red one in the middle has the eff. permitivity of 18 at GHz, the 2 on the sides the eff. permitivity of 1(air) according to Fresnel Equations r = (n2 - n1) / (n2 + n1) = 0.8947 if i just take my nearfield data at the boundary and divide it with 1V/m incident field, i become r = 0.2
Hi AltairHW I'm using FEKO 14.410 EDU edition and experimenting with the script example https://www.feko.info/support/lua-scripts/radiation-hazard-iso-surfaces/radiation-hazard-iso-surfaces-wizard When running this code I receive an error when setting p1.IsoSurface.Value = 41 "POSTFEKO 14.0.410-277905 (x64) c:\Development\Workspace\win64_Maintenance\utilities\geometry\include\common_RangeOf.hxx (41): Assertion failed: !isEmpty() " If I comment out this line the script completes without error. I can't determine why p1 is failing to set the value. What is strange is p2 is a duplicate of p1 and it will set p2 value without error. p1 = app.Views:Item(views+1).Plots:Add(scaledNearField) p1.Visible = false p1.PlotType = "Iso-surface" p1.Legend.Position = "None" p1.Label = ("RMS_Public" .. append_to_label) p1.Visualisation.Opacity = 40 p2 = p1:Duplicate() p2.Label = ("RMS_Occupational" .. append_to_label) p2.Visualisation.Opacity = 40 -- ERROR OCCURS HERE WHEN SETTING p1's isosurface value -- If I comment out this line the script completes without error -- note that p2 successfully sets the value without error!? p1.IsoSurface.Value = 41 p1.Visible = true -- p2 is a duplicate of p1 -- can set p2 value without error p2.IsoSurface.Value = 92 p2.Visible = true regards David