simulation the ceramic antenna , is microstrip .

use PCAAD 5.0 ,

TOP METAL width 32mm
long 23mm.
cremic width 42mm ,long 34mm.thickness 2mm
ground is 80mm *80mm pec conductor .

ceramic Er is 50

the result(cavity model ) is center frequency 939MHZ .

but use HFSS

may i is wrong ?

this is Z

i think the result is wrong , pls any body help me !