Shift in anti-resonance frequency using CADFEKO vs EDITFEKO

Shan25_22239

Dear FEKO support team,

I have a wire antenna placed on an infinite ground plane modelled using CADFEKO and EditFEKO tools. The antenna geometry is identical in both the models, but I observe a shift in the impedance real and imaginary parts.   

In the CADFEKO model each wire segment is defined as a copper medium.  

and in the EDITFEKO model a SK card is added to define skin depth of the wire segment. The option "Exact expression for the skin effect" is used when modeling skin depth.

Can you please have a look at the attached models and let me know why there is a difference between the FEKO simulations?

 

  

 

Community-Pasted-Attachment-1661276435398.png

manu_spline_helix_onlyantenna.cfx

wire_helix_runningFine_1.pre

Madelé

Dear @Shan25

Have a closer look at the meshes of the two models. If you change the meshes to be more similar, you should get matching results. The EDITFEKO model has smaller mesh elements for the body part, while it has a larger feed segment than the CADFEKO model (note the "Maximum wire segment length" specified at the IP card in the EDITFEKO model).

Kind regards
Madelé