Rainbow Electronics GE863-PY - Manual (Page 29)

GE863 Hardware User Guide
1vv0300783 Rev.0 - 10/06/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 29 of 80
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
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 ohm
Input power > 2 W peak power
VSWR absolute
max <= 10:1
VSWR
recommended <= 2:1
When using the Telit GE863, since there's no antenna connector on the module, the antenna must be
connected to the GE863 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, then a PCB line is needed in order to connect with it or with its
connector.