User's Manual

MC46 Hardware Interface Description
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MC46_HD_V03.05 Page 65 of 99 13.11.2003
4.1.1 Antenna pad
The antenna can be soldered to the pad, or attached via contact springs. To provide a
proper ground for the antenna, MC46 comes with a grounding pad located close to the
antenna pad. The positions of both pads can be seen from Figure 28 and Figure 40. The
grounding pad should be connected to the ground plane of the application.
When you decide to use the antenna pad take into account that the pad has not been
intended as antenna reference point (ARP) for the Siemens MC46 type approval. The
antenna pad is provided only as an alternative option which can be used, for example, if the
recommended Hirose connection does not fit into your antenna design.
Also, consider that according to the GSM recommendations TS 45.005 and TS 51.010-01 a
50" connector is mandatory for type approval measurements. This requires GSM devices
with an integral antenna to be temporarily equipped with a suitable connector or a low loss
RF cable with adapter.
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.
MC46 material properties:
MC46 PCB: FR4
Antenna pad: Gold plated pad
4.1.1.1 Suitable cable types
For direct solder attachment, we suggest to use the following cable types:
· RG316/U 50" coaxial cable
· 1671A 50" 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
.