I originally used a Perf_E as the bottom ground of an metamaterial antenna simulation(driver modal). The size of the ground was the same as the airbox and connected to the Lumped Port. But I found the size shouldn't be right (too large). Then I reduced the size of the bottom ground to the same of the antenna model (i.e. the finished antenna). Then the number of tetrahedral is increased to the unbelievable 2 millions! The simulation time is unbelievable long and slow and it used up all the 16G memory.
What wrong could it be?
smaller size of the Ground would force radiation in opposite direction, result in very sensitive current distribution.
In HFSS when the current distribution change on meshes are high, the solver increase meshes in these regions
You can re-size radiation box and ground plane so the ground would be bigger than antenna size and smaller than radiation box
try to make a ground plan gigger that the antenna radiator between 2 and 4 Lambda. the rardiation box can't affect o lot your computation time.
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