User's Manual

FC20-N Series Hardware Design
FC20-N_Series_Hardware_Design Confidential / Released 25 /
47
RF_ANT
30
IO
RF antenna pad
50Ω impedance
GND
31
Ground
3.8.2. Operating Frequency
Table 13: Operating Frequency of the Module
Feature
Frequency
Unit
WLAN-2.4GHz
2.412~2.462
GHz
3.8.3. Reference Design
FC20 series module provides an RF antenna pad for antenna connection. The RF trace in host PCB
connected to the module’s RF antenna pad should be microstrip line or other types of RF trace, whose
characteristic impendence should be close to 50Ω. FC20 series module comes with grounding pads
which are next to the antenna pad in order to give a better grounding.
The RF external circuit is recommended as following figure. And a π-type matching circuit should be
reserved for better RF performance. The capacitors are not mounted by default.
RF_ANT
R1
C1
NM
C2
NM
FC20 Series
0R
Figure 8: Reference Circuit for RF Antenna Interface
3.8.4. Antenna Requirements
The following table shows the requirements on RF antenna.