Specifications

WM_PRJ_Q2501_PTS_002 - 001
March 2004
confidential ©
Page: 54 / 79
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 0.5 dB can be considered as a maximum value for loss between the
module and an external connector.
3.5.2 GSM/GPRS antenna connection
3.5.2.1 Antenna specifications
The GSM/GPRS antenna must fulfil the requirements given in the table
hereafter.
A dual-Band antenna will work in these frequency bands and must have the
following characteristics:
Characteristics E-GSM 900 DCS 1800
Frequency TX 880 to 915 MHz 1710 to 1785 MHz
Frequency RX 925 to 960 MHz 1805 to 1880 MHz
Impedance 50 Ohms
Rx max 1.5 : 1
VSWR
Tx max 1.5 : 1
Polarization Linear
Typical radiated
gain
0 dBi in one direction at least
Note
:
 WAVECOM recommends a VSWR max. of 1.5:1 for the Rx and Tx.
Nevertheless, all aspects of this specification will be fulfilled even with a
VSWR max. of 2:1 for the Rx and the Tx.
 the DC impedance presented by the GSM/GPRS connection is floating.
Nevertheless, there is no problem when using antennas that present a
short to ground.
GSM antenna providers:
Refer to paragraph 9.6.