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HUAWEI MG323 GSM M2M Module
Hardware Guide
Antenna Interface
Issue 04 (2011-08-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
27
4 Antenna Interface
4.1 About This Chapter
An RF connector or an antenna pad can be used as the connection method of an
antenna interface. When the MG323 module works properly, only one of the
preceding connection methods is used. In addition, the antenna interface must be
used with coaxial cables with 50 ohm characteristic impedance.
4.2 Antenna Installation
The MG323 module supports the following two antenna connection methods: buckled
RF connector U.FL-R-SMT-1(80) manufactured by Hirose, and antenna pad. It is
recommended that you use the buckled RF connector.
When the MG323 module works properly, only one antenna connection method can
be used; otherwise, the RF performance may deteriorate.
If a buckled RF connector is used, it is recommended that you use a 50-ohm coaxial
cable in the U.FL series. The height of the connector increases by 0.8 mm when this
cable is used.
If an antenna pad is used, you need to connect the coaxial cable core to the pad. In
addition, you need to connect the shield ground of the coaxial cable to the reference
ground near the pad. You can choose a suitable direction to weld the RF cable to
meet the installation requirements according to the actual application.
When trying to shorten the opening between the coaxial cable core and the shield
ground, you also need to prevent a short circuit.