TC65 Hardware Interface Description
Strictly confidential / Draft
s
TC65_HD_V00.521
Page 65 of 99
24.05.2005
4.2 Antenna
Pad
The antenna can be soldered to the pad, or attached via contact springs. For proper
grounding connect the antenna to the ground plane on the bottom of TC65 which must 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 TC65 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
Ω
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.
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.
TC65 material properties:
TC65 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
.