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FIBOCOM SU806 Series Hardware Guide
Page 57 of 86
4 Antenna Interface
SU806D-EAU series module support 2/3/4G main antenna/diversity reception antenna, WIFI/BT antenna
and GNSS antenna.
4.1
MAIN/DRX Antenna
SU806D-EAU series module provides two 2G/3G/4G antenna interfaces. The ANT_MIAN is used to
receive and transmit RF signal, the ANT_DRX is used for diversity reception.
Table 4-1 Main/DRX pin definition
Pin Name
Pin Number
I/O
Description
Note
ANT_MAIN
87
AI/AO
2G/3G/4G main antenna
-
ANT_DRX
131
AI
Diversity reception antenna
-
4.1.1
Antenna Reference Design
When use the SU806D-EAU series module, it is necessary to connect the antenna pin with the RF
connector or antenna feed point on the main board via an RF trace. Microstrip trace is recommended for
RF trace, with insertion loss within 0.2dB and impedance at 50Ω.A π-type circuit is reserved between the
module and the antenna connector (or feed point) for antenna debugging. Two parallel components are
directly connected across the RF trace and should not pull out a branch, as the figure shows:
Module
ANT_MAIN
ANT_DRX
0R
NC
NC
Main_Antenna
Diversity_Antenna
NC
0R
NC