User's Manual

GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.2 – 2011-06-15
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights
Reserved. Page 47 of 97
used for those OEM modules must not exceed 3dBi gain for
mobile and fixed operating configurations.
7.1.2. GE864-QUAD V2/GPS GSM Antenna – PCB line
Guidelines
When using the Telit GE864-QUAD V2 or GE864-GPS module, since
there's no antenna connector on the module, the antenna must
be connected to the GE864-QUAD V2 or GE864-GPS through the PCB
with the antenna pad.
In the case that the antenna is not directly developed on the
same PCB, hence directly connected at the antenna pad of the
GE864-QUAD V2 or GE864-GPS, then a PCB line is needed in order
to connect with it or with its connector.
This line of transmission shall fulfill the following
requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Impedance
50 ohm
Max
Attenuation
0,3 dB
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be
equipotential to the GE864-QUAD V2 ground pins
This transmission line should be designed according to the
following guidelines:
• Ensure that the antenna line impedance is 50 ohm;
• Keep the antenna line on the PCB as short as possible,
since the antenna line loss shall be less than 0,3 dB;
• Antenna line must have uniform characteristics, constant
cross section, avoid meanders and abrupt curves;
• Keep, if possible, one layer of the PCB used only for the
Ground plane;
• Surround (on the sides, over and under) the antenna line
on PCB with Ground, avoid having other signal tracks
facing directly the antenna line track;
• The ground around the antenna line on PCB has to be
strictly connected to the Ground Plane by placing vias
once per 2mm at least;