Huawei MU509 - Antenna Interface Design Guide

HUAWEI 30 mm × 30 mm LGA Module
Hardware Migration Guide
LGA Interface Differences
Issue 08 (2016-12-12)
HUAWEI Proprietary and Confidential
Copyright © HUAWEI Technologies Co., Ltd.
33
2.5.2 Antenna Interface Design Guide
To implement compatibility among the Huawei 30 mm × 30 mm LGA modules, pay
attention to antenna interfaces pin 107 (MAIN_ANT), pin 111 (GPS_ANT), and pin
115 (AUX_ANT).
Pay attention to the interface differences among the MU509 and other 30 mm × 30
mm LGA modules.
Table 2-12 Differences of the antenna interface in pad size and function
Pin
No.
Interface
Name
MU509
MC509
MU609
ME909u
ME209u-
526
MU709
ME909s
107,
111
and
115
Antenna
interface
ANT
pad size
1.5 mm × 1.0 mm
1.02 mm × 0.82 mm
ANT
function
Main (pin 107)
Main (pin 107),
AUX (pin 115),
GPS (pin 111)
Main (pin 107),
AUX (pin 115)
Main (pin
107),
AUX (pin
115)
RF Signal Trace in the Main Board Design of Customers
It is recommended that you design antenna interfaces as follows:

The antenna signal trace must be as short as possible, and controlled with 50 Ω
impedance.

The antenna interfaces pin 107, pin 111, and pin 115 should be also controlled
with 50 Ω impedance.

A π matching network must be reserved for radio frequency (RF) trace between
output pins of MAIN_ANT, AUX_ANT, and GPS_ANT and antenna interfaces.
There is an example of the matching network for MAIN_ANT as shown in Figure
2-17 .The components of G_C1, G_L1, and G_L2 compose a π matching
network. The G_C2 is for DC blocking and matching design. The matching
network for AUX_ANT and GPS_ANT are the same as the MAIN_ANT.