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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 https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/bluetooth-forum/630896/cc-antenna-dk-rd-2-4-ghz-pcb-antenna-design-files),  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,

P.