Hello,
The manufacturer of the chip antenna AT9520 is:
ACX
Advanced Ceramic X
TEL :+886-3-5987008 ext 292
FAX :+886-3-5987001
Mail :acx@acxc.com.tw
Website: www.acxc.com.tw
Address :ACX Corp.
16 Tzu Chiang Road, Hsinchu Industrial District, Hsinchu Hsien,Taiwan,330
I used this antenna as referenced by Freescale and thre results was satisfactory, (same sight distance if you compare it with SARD boards). Complete P/N of this antenna is: AT9520-B2R4HAAT/CF
Regards,
SamRam