Suitable Cable Types; Figure 3: Gsm Antenna Pad Placement - Siemens XT65 Hardware Overview

XT65/XT75 Hardware Interface Overview
4.2 Antenna Pad
Also, consider that according to the GSM recommendations TS 45.005 and TS 51.010-01 a 50Ω 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.
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).
XT65_XT75_HO_v00.130
Confidential / Preliminary

Figure 3: GSM antenna pad placement

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2006-10-12