Hi Emmanuel,
Thank you for reaching out to the Ansys learning forum.
This error occurs if both the top and bottom conductor sheets are shorted. Please see if Auto open region is enabled under in the solution type window. If not, as explicit air region should be added as the default material in Ansys HFSS is PEC.
Kindly go through this video lecture on patch antenna simulation in Ansys HFSS for detailed information on how to set up the simulation - Microstrip Patch Antenna Array - ANSYS Innovation Courses.
Best regards,
Praneeth.
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