Huawei ME909u-521 - Page 56

HUAWEI ME909u-521 LTE LGA Module
Hardware Guide
RF Specifications
Issue 05 (2017-12-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
56
3.8 V
LC
LC
LC
ME909u-521
5G WIFI
Other circuit
RF Front End Design Circuit for ME909u-521
There are low pass filter between module MAIN_ANT pad and main antenna
connector for harmonic filtering. The recommend key electrical specification for LPF
and RF front end circuit are respectively listed in Table 4-5 and Figure 4-1
Table 4-5 The recommend key electrical specification for LPF
Parameter
Frequency (Unit: MHz)
Typical Value (Unit: dB)
Insert loss
300–2690
0.4
Attenuation
4900–5950
35
Figure 4-1 The recommend RF front end circuit
ME909u-521
LPF
Matching
Network
Matching
Network
MAIN_ ANT
PCB Placement Suggestion
For PCB placement, we recommend to keep 5 GHz WIFI antenna away from
ME909u-521 module and its main antenna as far as possible.