Wireless Antennas | Multi-Tech Systems MultiModem instruction

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	E	-GSM 900	GSM 1800	GSM 1900
Frequency RX	869 to 894 MHz	925 to 960 MHz		1805 to 1880 MHz	1930 to 1990 MHz
Frequency TX	824 to 849 MHz	880 to 915 MHz		1710 to 1785 MHz	1850 to 1910 MHz
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			50 ohms
VSWR		<2
Typical Radiated Gain			0 dBi on azimuth plane

CDMA Radio Characteristics

	CDMA 800		CDMA 1900
Frequency RX	869 to 894 MHz		1930 to 1990 MHz
Frequency TX	824 to 849 MHz		1850 to 1910 MHz
Impedance		50	ohms
VSWR		<2
Typical Radiated Gain	0 dBi in at least one direction

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)

Multi-Tech Systems MultiModem Wireless Antennas, GSM and Cdma Antenna, GSM Radio Characteristics

Chapter 5 – Wireless Antennas

The Antenna

GSM and CDMA Antenna

GSM Radio Characteristics

CDMA Radio Characteristics