User's Manual

GE865 Hardware User Guide

1vv0300799 Rev.11 – 13-07-2010

This transmission line shall fulfill the following requirements:

ANTENNA LINE ON PCB REQUIREMENTS

Characteristic Impedance

50Ω

Max Attenuation

0,3 dB

Coupling with other signals shall be avoided

Cold End (Ground Plane) of antenna shall be equipotential to

the GE865 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. In order to re-use the

Telit FCC/IC approvals the antenna(s) used for this transmitter must be installed to

provide a separation distance of at least 20 cm from all persons and must not be co-

located or operating in conjunction with any other antenna or transmitter. If antenna is

installed with a separation distance of less than 20 cm from all persons or is co-located

or operating in conjunction with any other antenna or transmitter then additional

FCC/IC testing may be required. End-Users must be provided with transmitter

operation conditions for satisfying RF exposure compliance.

Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed

operating configurations.

7.2 GSM Antenna - PCB line Guidelines

Make sure that the impedance is 50Ω ;

Keep line on the PCB as short as possible, since the antenna line loss shall be less

than around 0,3 dB;

Line geometry should have uniform characteristics, constant cross section, avoid

meanders and abrupt curves;

Any kind of suitable geometry / structure (Microstrip, Stripline, Coplanar, Grounded

Coplanar Waveguide...) can be used for implementing the printed transmission line

afferent the antenna;

If a Ground plane is required in line geometry, that plane has to be continuous and

sufficiently extended, so the geometry can be as similar as possible to the related

canonical model;

Keep, if possible, at least one layer of the PCB used only for the Ground plane; If

possible, use this layer as reference Ground plane for the transmission line;

It is wise to surround (on both sides) the PCB transmission line with Ground, avoid

having other signal tracks facing directly the antenna line track.

Avoid crossing any un-shielded transmission line footprint with other signal tracks on

different layers;