I  had  design  multi-element  structure  for  MIMO  antenna  system  with  desire resonating frequency  of  3.5 GHz.  But  if  the  same  structure is  simulated  with  adaptive  mesh  option  the  resonating  frequency shift to 3.6.

And   when  I  use  same  structure  in  HFSS  the  resonating  frequency  is  3.7.

I  wonder  why  this  shift of  resonating frequency  is  occurring... 

 

Or   Their   should  be  some  proper  manual  or  notes  about accuracy  of  CST  microwave  result.

And  When   I  fabricated  my  antenna  the  resonating frequency  was  3.8...

Your  suggestion  in this  regard  will  be  highly  appreciated.

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