GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.5 – 2011-10-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 51 of 94
7.3.4.
GPS Antenna - PCB Line Guidelines
Ensure that the antenna line impedance is 50
Ω
.
Keep the antenna line on the PCB as short as possible to reduce the loss.
Antenna line must have uniform characteristics, constant cross section, avoid
meanders and abrupt curves.
Keep one layer of the PCB used only for the Ground plane, if possible.
Surround (on the sides, over and under) the antenna line on PCB with Ground,
avoid having other signal tracks facing directly the antenna line of 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.
Place EM noisy devices as far as possible from GE864-GPS antenna line.
Keep the antenna line far away from the GE864-GPS power supply lines.
Keep the antenna line far away from the GE864-GPS GSM RF lines.
If you have EM noisy devices around the PCB hosting the GE864-GPS, such as
fast switching ICs, take care of the shielding of the antenna line by burying it
inside the layers of PCB and surround it with Ground planes, or shield it with a
metal frame cover.
If you do not have EM noisy devices around the PCB of GE864-GPS, use a strip-
line on the superficial copper layer for the antenna line. The line attenuation will
be lower than a buried one.
7.3.5.
GPS Antenna - Installation Guidelines
The GE864-GPS due to its characteristics of sensitivity is capable to perform a
Fix inside the buildings. (In any case the sensitivity could be affected by the
building characteristics i.e. shielding).
The Antenna must not be co-located or operating in conjunction with any other
antenna or transmitter.
Antenna must not be installed inside metal cases.
Antenna must be installed also according Antenna manufacturer instructions.
