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CC-ANTENNA-DK2: Board#3 S params

Part Number: CC-ANTENNA-DK2

Hi TI team,

On Board#3, supposed to be a dual-band 868MHz-2.4GHz. When I measure the S11 of this board, I get picks at 2.0GHz (and 4.7GHz) which is very far from 2.4GHz, plus there is nothing at 868MHz.

(To be sure, I measured 2 different kits but they both gave the exact same results)

Does it mean the user need to determine his own tuning adaptation to get those frequencies back to 868 and 2400MHz ?

I know this is a Fractus product, but you positionned 5 components on the board, I was thinking the goal of these components were the tuning for the expected dual-band frequencies.