User's Manual

Appendix B – Sourcing Guide for Connectors/Peripherals
Wireless ModemModule MTMMC-C Developer's Guide 23
Appendix B – Sourcing Guide for Connectors and
Peripheral Devices
CDMA Antenna
The integrated modem antenna connector is a MMCX connector. The MMCX connector incorporates a 'Snap On'
latching action in order to make the connection easier with 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.
Radio Characteristics
CDMA 850 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
<1.5
Typical
Radiated
Gain
0 dBi in at least one direction
MMCX Plug
The ModemModule requires an MMCX plug to connect to an antenna.
MMCX Connector Example (right angle type)
Antenna
An antenna with matting connector can be ordered, for example, from:
IMS Connectors Systems GMBH
http://www.imscs.com/
MMCX / SMA Adapter
A small MMCX / SMA adapter can be ordered, for example, from:
Amphenol
http://www.amphenol.com/
Order No: 908-31100