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Help me ! it is incorrect about simulation of 915MHZ antenna

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jimliu12

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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 .

55_1163924674.jpg


but use HFSS

may i is wrong ?

this is Z

31_1163924572.jpg


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

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