Telit Wireless Solutions GE863-QUAD - Manual (Page 22)

GE863-QUAD
GE863-PY
1vv0300715 Rev. 1 - 19/09/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 22 of 79
5 Antenna
The antenna connection and board layout design are the most important part in the full product design
and they strongly reflect on the product overall performances, hence read carefully and follow the
requirements and the guidelines for a proper design.
5.1 GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE863-
QUAD/PY device shall fulfil the following requirements:
ANTENNA REQUIREMENTS
Frequency range Standard Dual Band GSM/DCS frequency
range or
Standard Quad Band GSM/DCS/PCS
frequency range if used for all four bands
Bandwidth 80 MHz in GSM900, 70MHz in GSM850 &
170 MHz in DCS & 140 MHz PCS band
Gain Gain < 3dBi
Impedance 50 ohm
Input power > 2 W peak power
VSWR absolute
max <= 10:1
VSWR
recommended <= 2:1
When using the Telit GE863-QUAD/PY, since there's no antenna connector on the module, the
antenna must be connected to the GE863-QUAD/PY through the PCB with the antenna pad.
In the case that the antenna is not directly developed on the same PCB, hence directly connected at
the antenna pad of the GE863-QUAD/PY, then a PCB line is needed in order to connect with it or with
its connector.
This line of transmission shall fulfil the following requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Impedance 50 ohm
Max Attenuation 0,3 dB
No coupling with other signals allowed
Cold End (Ground Plane) of antenna shall be equipotential to
the GE863-QUAD/PY ground pins
Furthermore if the device is developed for the US market and/or Canada market, it shall comply to the
FCC and/or IC approval requirements: