Rainbow Electronics GE863-PY - Manual (Page 33)

GE863 Hardware User Guide
1vv0300783 Rev.0 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 33 of 80
This line of transmission shall fulfill the following requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Impedance 50 ohm
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be equipotential to
the GE863-GPS ground pins
Furthermore if the device is developed for the US market and/or Canada market, it shall comply with
the FCC and/or IC approval requirements:
This device is to be used only for mobile and fixed application.
5.5 GPS Antenna - PCB Line Guidelines
• Ensure that the antenna line impedance is 50 ohm;
• 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, 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;
• Place EM noisy devices as far as possible from GE863-GPS antenna line;
• Keep the antenna line far away from the GE863-GPS power supply lines;
• Keep the antenna line far away from the GE863-GPS GSM RF lines;
• If you have EM noisy devices around the PCB hosting the GE863-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 don't have EM noisy devices around the PCB of GE863-GPS, by using a strip-line on the
superficial copper layer for the antenna line, the line attenuation will be lower than a buried one;
5.6 GPS Antenna - Installation Guidelines
• The GE863-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 shall not be installed inside metal cases
• Antenna shall be installed also according Antenna manufacturer instructions.