GE9
GE9
GE9
GE910 Hardware User Guide
10 Hardware User Guide
10 Hardware User Guide
10 Hardware User Guide
1vv0300962 Rev.4 2012-06-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 34 of 73
Mod. 0805 2011-07 Rev.2
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.
6.2.
GSM Antenna - PCB line Guidelines
•
Make sure that the transmission line’s characteristic impedance is 50
Ω
;
•
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;
•
The ground surrounding the antenna line on PCB has to be strictly connected to the main
Ground Plane by means of via holes (once per 2mm at least), placed close to the ground
edges facing line track;
•
Place EM noisy devices as far as possible from GE910 antenna line;
•
Keep the antenna line far away from the GE910 power supply lines;
•
If EM noisy devices are present on the PCB hosting the GE910, 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 EM noisy devices are not present around the line, the use of geometries like Microstrip
or Grounded Coplanar Waveguide has to be preferred, since they typically ensure less
attenuation if compared to a Stripline having same length;
