Learning Forum

[KruglovDmitrii]

Dear all,

I am trying to see how a couple of theoretical point current sources would radiate in our substrate, and for that I calculate the fields on a surface of a shpere in MATLAB using analytical formulas, and then save these field into *.and and *.nfd files in a format specified in the HFSS manual. I then go to Excitations->Assign->Linked Field-> Near Field and show the path to the *.and file. HFSS then auto-generates a separate design with the PEC sphere in the origin, and in the main design an excitation pops up under the Excitations tab.

So, what does HFSS do exactly? If I try to create an infinite ground plane in a main design, HFSS gives me an error saying that there's no infinite ground plane in the source design. Why would it care about it? I thought the whole point of Linked Near Fields is that one defines the source, puts it into a little "box", and then imports this box as a source into a different project.

Another thing, when I calculate the directivity of a source in that auto-generated design I get the correct results (e.g. ~1.5 for a point electric dipole), but if I try to calculate how much power is radiated from a dipole I get weird results: I go to Field Calculator and Poynting->Real->SurfaceX->Normal->Integrate->Eval and get very different values for different enclosed surface I calculate the power flow through.

HFSS manual briefly describes how to assign the Linked Near Fields, but it doesn't go into details on what is it actually doing, so any help here would be highly appreciated.

Thanks,

Dmitrii

 

[Anurag Pallaprolu]