Wi-Fi&Bluetooth Module Series
FCM561D-P_Hardware_Design
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Appropriate antenna type and design should be used with matched antenna parameters according to
specific application. It is required to perform a comprehensive functional test for the RF design before
mass production of terminal products. The entire content of this chapter is provided for illustration only.
Analysis, evaluation and determination are still necessary when designing target products.
5.3.1. Pin Antenna Interface (ANT_WIFI/BT)
7
Table 27: ANT_WIFI/BT Pin Definition
5.3.1.1.
Reference Design
A circuit of the RF antenna interface is shown below. For better RF performance, it is necessary to
reserve a π matching circuit and add ESD protection components. Reserved matching components such
as R1, C1, C2, and D1 should be placed as close to the antenna as possible. C1, C2, and D1 are not
mounted by default. The parasitic capacitance of TVS should be less than 0.05 pF and R1 is
recommended to be 0 Ω.
ANT_WIFI/BT
R1
C1
NM
C2
NM
Module
0R
D1
NM
Figure 11: RF Antenna Reference Design
5.3.1.2.
Antenna Design Requirements
Table 28: Antenna Design Requirements
7
The module is provided with one of the two antenna interface designs. For more details, contact Quectel Technical
Support.
Pin Name
Pin No.
I/O
Description
Comment
ANT_WIFI/BT
2
AIO
Wi-Fi/Bluetooth antenna interface
50 Ω characteristic
impedance.
Parameter
Requirement
