How Do I Obtain Resonance for a Loop Antenna in HFSS?

- April 19, 2022 at 3:57 pm
  
  Hyperion
  Subscriber
  
  I am trying to make a loop antenna, as below, which has a perimeter of roughly 25 cm. Loop antennae have a perimeter of one wavelength at resonance, so this antenna should resonate at 3e8/0.25=1.2e9 Hz = 1.2GHz. I have simulated it several ways (single solution frequency, broadband; fast, discrete and interpolating sweeps), but none of them show a resonance there. Note that there is no ground plane under the antenna, as the port is between the two open faces of the trace and one side acts as the ground. Does anyone have any experience with this, or an idea of what's wrong?
  Screenshot 2022-04-19 095819.jpg
- May 2, 2022 at 12:00 pm
  
  Praneeth
  Ansys Employee
  
  Please provide more details to help us serve you better.
  Have you defined all the required details in your model? How is the port excited? Please check once.
  Please provide a snapshot highlighting all the parts of it.
  All the very best Praneeth.
- May 3, 2022 at 8:37 am
  
  Hyperion
  Subscriber
  
  Hi all I found out that in making an antenna without a ground plane the radiation boundary cannot touch the underside of the antenna. That probably is common knowledge, but in the tutorials I could find (all of which had ground planes), the radiation boundary could touch the underside of the substrate, since the ground plane blocks radiation. Once I changed the boundary to not touch the antenna at all and to be much further from all points on the antenna, the simulation works.
  -Hyperion
- May 3, 2022 at 8:37 am
  
  Hyperion
  Subscriber
  
  Hi all I found out that in making an antenna without a ground plane the radiation boundary cannot touch the underside of the antenna. That probably is common knowledge, but in the tutorials I could find (all of which had ground planes), the radiation boundary could touch the underside of the substrate, since the ground plane blocks radiation. Once I changed the boundary to not touch the antenna at all and to be much further from all points on the antenna, the simulation works.
  -Hyperion

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