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CC-ANTENNA-DK2: HFSS simulates Board#11, not showing Multi-Band (868MHz/2.4GHz)

Part Number: CC-ANTENNA-DK2

Hi TI experts,

I did a simulation of Board#11 using HFSS (according to the DXF found from,  but S11 shows only 2.4GHz but poor at 868MHz.  Can anyone kindly help to check where is the problem please?  (the HFSS file: DK2.aedt)

Thank you very much in advance,