User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 54 of 89
Furthermore if the device is developed for the US and/or
Canada market, it must comply to the FCC and/or IC approval
requirements:
This device is to be used only for mobile and fixed
application.
7.5. GPS Antenna-PCB Line Guidelines (HE863-
EUG/NAG/AUG only)
 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 HE863-
EUG/NAG/AUG antenna line;
 Keep the antenna line far away from the HE863-
EUG/NAG/AUG power supply lines;
 Keep the antenna line far away from the HE863-
EUG/NAG/AUG WCDMA/GSM RF lines;
 If you have EM noisy devices around the PCB hosting
the HE863-EUG/NAG /AUG, 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
HE863-EUG/NAG /AUG, by using a strip-line on the
superficial copper layer for the antenna line, the
line attenuation will be lower than a buried one;