
XT65/XT75 Hardware Interface Overview
4.2 Antenna Pad
s
XT65_XT75_HO_v00.130
Page 22 of 67
2006-10-12
Confidential / Preliminary
Also, consider that according to the GSM recommendations TS 45.005 and TS 51.010-01 a 50
Ω
connector is
mandatory for type approval measurements. This requires GSM devices with an integral antenna to be tempo-
rarily equipped with a suitable connector or a low loss RF cable with adapter.
Figure 3:
GSM antenna pad placement
Notes on soldering:
• To prevent damage to the module and to obtain long-term solder joint properties you are advised to maintain
the standards of good engineering practice for soldering.
• Be sure to solder the antenna core to the pad and the shielding of the coax cable to the ground plane of the
module next to the antenna pad. The direction of the cable is not relevant from the electrical point of view.
XT65/XT75 material properties:
XT65/XT75 PCB: FR4
Antenna pad:
Gold plated pad
4.2.1
Suitable Cable Types
For direct solder attachment, we suggest to use the following cable types:
• RG316/U 50Ohm coaxial cable
• 1671A 50Ohm coaxial cable
Suitable cables are offered, for example, by IMS Connector Systems. For further details and other cable types
please contact
http://www.imscs.com
.
Please note that the GSM antenna must be isolated for ESD and SAR protection (to withstand a voltage resis-
tance up to 8kV air discharge).