
GE865 Hardware User Guide
1vv0300799 Rev.9 – 27-07-2009
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 32 of 70
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 product overall performances, 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 GE865 device shall fulfil the following requirements:
ANTENNA REQUIREMENTS
Frequency range
Depending by frequency band(s) provided 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 < 3dBi
Impedance
50
Ω
Input power
> 2 W peak power
VSWR absolute max
≤
10:1
VSWR recommended
≤
2:1
When using the GE865, since there's no antenna connector on the module, the
antenna must be connected to the GE865 through the PCB with the antenna pad (BGA
Ball H5).
In the case that the antenna is not directly developed on the same PCB, hence directly
connected at the antenna pad of the GE865, then a PCB line is needed in order to
connect with it or with its connector.