User's Manual

Telit GE863-GPS

Hardware User guide

1vv0300714, Rev. ISSUE#0, - 21/02/06

4.5 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;

4.6 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.