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CC2590: Pairing range issue (without range extender)

Part Number: CC2590


HI,

i'm developing my own Tx Board. 

it's design is almost same with CC85XX DK Headset.

the only difference with my board and CC85XX DK Headset is CC2590 range extender.

i didn't equip CC2590 on my board and here is my issue.

when i tested pairing range with my board and CC85XX DK Headset, it's pairing range is too short to can't connected over 3 meters.

and stability of connection is also bad. over 5 meters, stability is too bad to can't hear any sounds.

i'm using 2450A18A100 mini 2.45GHz antenna on my board.

what am i doing wrong?

1) range extender is necessary to pairing with another board in long range?

2) if not necessary, did i add another setting or hardware to my board?

any help will be appreciated!