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SIM548C Hardware Design
5 Antenna interface
5.1 GSM Antenna
The RF interface has an impedance of 50Ω. To suit the physical design of individual applications
the module offers alternatives:
Recommended approach: antenna connector on the component side of the PCB
Antenna pad and grounding plane placed on the bottom side.
To minimize the loss on the RF cable, it need be very careful to choose RF cable. We recommend
the insertion loss should be meet following requirement:
GSM850/GSM900<0.5dB
DCS1800/PCS1900<1.0dB
5.1.1 GSM Antenna connector
The module use MURATA's MM9329-2700 RA1 RF connector on the module side, we
recommend user use MURATA's MXTK92XXXXX as matching connector on the application side.
Please refer to appendix for detail info about MURATA's MXTK92XXXXX.
5.1.2 GSM Antenna pad
The antenna can be soldered to the pad, or attached via contact springs. To help you to ground the
antenna, The module comes with a grounding plane located close to the antenna pad. The antenna
pad of the module is shown as the following figure:
SIM548C_HD_V1.01
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09.05.2008
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