Specifications

WM_PRJ_Q2501_PTS_001 – 003

March 2004

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3.4 Antenna specifications

3.4.1 GSM.DCS Antenna

A GSM/DCS dual-band antenna shall work in these frequency bands and 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

VSWR Rx max 1.5 : 1

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 the Tx.

All aspects of this specification will be fulfilled even with a VSWR max. of 2:1 for

the Rx and the Tx.

3.4.2 GPS antenna

The GPS antenna must fulfill the following requirements:

Characteristics GPS

Frequency RX 1575.42 MHz +/-1.023 MHz

Impedance 50 Ohms

VSWR Rx max 1.5 : 1

Polarization RHCP

Antenna gain 15 dB typ.

45 dB max.

Typical radiated gain 5 dBi in one direction at least

Supply voltage 3 V or 5 V

Supply current 10 mA max. for internal supply

(internal LDO)

50 mA max. for external supply

(GPS_VANT input)

Note:



If a classical patch antenna is followed by an LNA, care must be taken

when placing the antennas: the DCS1800 transmission can saturate the

GPS thus decreasing the GPS performances.



if combined antennas are used, isolation of GSM/DCS & GPS is a key

parameter.