Huawei Technologies Co. Ltd UM01-HW 用户手册
MC703 CDMA EV-DO Wireless Module V100R001
Product Description
Issue 1.00 (2009-9-10)
Huawei Proprietary and Confidential
Page 17 of 40
Figure 2-2 shows the RF connector. The interface on the RF connector are pointed by the red
arrows. The antenna pad is located at the bottom of the RF connector. A coaxial cable can be
soldered on the antenna pad for connecting an external antenna to the UM01-HW UMTS
module.
arrows. The antenna pad is located at the bottom of the RF connector. A coaxial cable can be
soldered on the antenna pad for connecting an external antenna to the UM01-HW UMTS
module.
The RF connector and antenna pad can only be applied alternatively. When using the antenna
pad, make sure that the surface of the soldering points is smooth to reduce the impact of the
soldering on RF signals.
pad, make sure that the surface of the soldering points is smooth to reduce the impact of the
soldering on RF signals.
Figure 2-2 RF connector
The antenna whose gain value is less than 1 dBi is recommended.
According to the cabling of the circuit board, adjust the reference value of each component.
You can connect an inductor of 68 nH to 100 nH for electrostatic discharge (ESD) protection
to the ground. Pay attention to the impedance matching and ESD protection capability or
lightning protection capability of the antenna.
You can connect an inductor of 68 nH to 100 nH for electrostatic discharge (ESD) protection
to the ground. Pay attention to the impedance matching and ESD protection capability or
lightning protection capability of the antenna.