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Thin coil of current E-field in HFSS

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shmiv

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Hi,

I'm looking to extract the E-field (at various distances) for a thin coil in free space with a specified sinusoidal current in HFSS.

I have a thin 2D coil (10 µm thick) drawn as a sheet and set as a Perfect E boundary. It has a radius of 10 mm. I've created a gap of 10 µm at the left end of the coil, and filled that in with another 2D sheet that's designated as the current excitation at the default of 1 A. The coil is inside a vacuum open radiation boundary.

In running the simulation at 450 MHz, everything converges just fine. However, when I look at the E-field 2 mm above the coil, it clearly has the right shape (rotational E-field only), but is not centered on the coil. It almost looks as though the current source is leaking/radiating outside the coil. If I rotate the coil and the location of the current source, this "center" moves with it.

Did I not define the current excitation correctly? Or should I use a different source? The E-field looks right except for where it is centered. Any help is greatly appreciated! I've attached my archived simulation, as well as pictures of the source and vector E-field.

Thanks :)
 

Attachments

  • coil_source_closeup.png
    coil_source_closeup.png
    195.9 KB · Views: 21
  • Efield_vector_coil.jpg
    Efield_vector_coil.jpg
    467.4 KB · Views: 22
  • current_loop_free_space_HFSSmodel.zip
    37.6 KB · Views: 0

nitinwa33

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If I am not wrong, you have neglected the thickness and just defined a 2D sheet for the coil (In order to make it perfect E) ? If yes, instead of that I would recommend you to define a 3D coil and assign it as a pec material. Now that you have a thickness, define current source on the face of the coil. Please note that you cannot use copper/Aluminum instead of PEC material. Reason being Copper/ Aluminum and other materials use 'Solve inside' option which obstructs open radiation boundary problem where as 3D PEC material doesnt use 'solve inside' option.

Hope this helps you.
 

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