I am a newbie on antenna, after study a lot from internet, get some knowledge about it.

PCB board is 1mm, composed by 9 layers:

1. Top Solder Mask      ==> 0.5mil
2. Top Copper           ==> 1.35mil(1oz)
3. PP 7628              ==> 7mil 
4. Inner Copper         ==> 1.35mil
5. Main                 ==> 20mil 
6. Inner Copper         ==> 1.35mil
7. PP 7628              ==> 7mil
8. Bottom Copper        ==> 1.35mil
9. Bottom Solder Mask   ==> 0.5mil

Total: about 40mil

PP7628 DK=4.2~4.7(4.7,<1GHz), use 4.3 for 2.4GHz. width=13mil,  Z=49~50ohm,  ceramics antenna Z=50ohm, perfect matched. So after this calculation, I changed board height from 0.8mm to 1mm and use line width 13mil for antenna.