User's Manual

GE864- QUAD Har dwar e User Guide
1vv0300872 Rev.1 2010-04-02
- All Rights Reserved. Page 35 of 77
7. Antenna
The antenna connection and board layout design are the most important part in the
full product design and they strongly reflect on the pr oduct overall per formances,
hence read carefully and follow the requirements and the guidelines for a proper
design.
7.1. GSM Antenna Requirements
As suggested on the Product Description the antenna and antenna line on PCB for a
Telit GE864-QUAD device shall fulfill the following requirements:
ANTENNA REQUIREMENTS
Fr equency r ange
Depending by frequency band(s) pr ovided
by the network operator, the customer
shall use the most suitable antenna for
that/those band(s)
Bandwidth
70 MHz in GSM850, 80 MHz in GSM900,
170 MHz in DCS & 140 MHz PCS band
Gain
Gain < 3dB i
Im pedance
50 Ω
Input power
> 2 W peak power
VSWR absol ute
max
<= 10:1
VSWR
r ecom mended
<= 2:1
When using the Telit GE864-QUAD, since there is no antenna connector on the
module, the antenna must be connected to the GE864-QUAD 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 GE864-QUAD, then a PCB line is needed
in order to connect with it or with its connector.
This line of transmission shall fulfill the following requirements:
ANTENNA LINE ON PCB REQUIREMENTS
Im pedance
50 Ω
Max Attenuation
0,3 dB
No coupling with other signal s al l owed
Col d End (Gr ound Pl ane) of antenna shal l be
equipotential to the GE864-QUAD gr ound pins