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Chapter 5 – Wireless Antennas
The Antenna
The antenna sub-system and integration in the application is a major issue: Choice of antenna (type, length,
performances, thermal resistance, etc.) These elements could affect wireless performances such as sensitivity and
emitted power.
GSM and CDMA Antenna
The integrated modem antenna connector is a SMA connector. The SMA connector incorporates a 'Screw-on' action
in order to make the connection easier while providing an excellent RF performance. An additional advantage is its
small physical size, which is 50% of the standard MCX connector.
This type of connector is suitable for the standard ranges of flexible and semi-rigid cables. The characteristic
impedance of the MMCX coaxial connector is 50 ohm. The antenna manufacturer must guarantee that the antenna
will be working according to the radio characteristics presented in the table below.
GSM Radio Characteristics
GSM 850
869 to 894 MHz
Frequency RX
824 to 849 MHz
Frequency TX
RF Power Stand 2W at 12.5% duty cycle 2W at 12.5% duty cycle 1W at 12.5% duty cycle 1W at 12.5% duty cycle
Impedance
VSWR
Typical Radiated Gain
CDMA Radio Characteristics
Frequency RX
Frequency TX
Impedance
VSWR
Typical Radiated Gain
An antenna that meets the requirements for use with the SocketWireless product is included with your purchase.
Multi-Tech Systems, Inc. MultiModem Wireless EDGE, GPRS, & CDMA Modem with Bluetooth (S000390B)
E-GSM 900
GSM 1800
925 to 960 MHz
1805 to 1880 MHz
880 to 915 MHz
1710 to 1785 MHz
50 ohms
<2
0 dBi on azimuth plane
CDMA 800
869 to 894 MHz
1930 to 1990 MHz
824 to 849 MHz
1850 to 1910 MHz
50 ohms
<2
0 dBi in at least one direction
Chapter 5 – Wireless Antennas
GSM 1900
1930 to 1990 MHz
1850 to 1910 MHz
CDMA 1900
16
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