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Chapter 5 – Wireless Antennas
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) | 16 |
MultiModem
User Guide
Copyright
Record of Revisions Revision Date Description
Trademarks
Table of Contents
Introduction Product Description
Bluetooth Interface
MultiModem Descriptions
Safety Warnings
Ship Kit Contents
Front Panel
Specifications Wireless Modems with Bluetooth
Packet Data
Setup
Setup and Activation
Switch settings for these configurations
Establish a Wireless Account for EDGE, GPRS, or
Activate the Wireless Modem
SIM commands for Gprs
SIM commands for Edge
Connect the Modem to the Internet Using AT Commands
Cdma Steps for Connecting to the Internet
Gprs and Edge Steps for Connecting to the Internet
Preliminary Information and Steps
Download Sales & Inventory Using an Adapter as Slave
Using a Bluetooth-Enabled PDA to Access the Internet
Application Examples
Overview of the Applications Shown Above
Adapter Setup Steps
ATSW20,472,0,0,1 crlf
Factory Defaults
Send ATSW20,472,0,0,1 cr Reply
Send ATSi,7 crlf
Send ATSW25,1,1,0,0 crlf
Send ATSC,00520204 crlf
Other Commands
Type AT+CSO
Type AT+CREG?
Reply OKcrlf
Wireless Antennas
GSM Radio Characteristics
Cdma Radio Characteristics
Antenna
Bluetooth Antenna Requirements
Multi-Tech Warranty Statement
Repair Procedures for U.S. and Canadian Customers
Repair Procedures for International Distributors
Replacement Parts
Appendix B Waste Electrical Electronic Equipment
Waste Electrical and Electronic Equipment Weee
AT commands
Index