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3.8. RF Antenna Interfaces
ANT_BT and ANT_WIFI is the RF antenna pin, and the RF port requires 50 Ω characteristic impedance.
3.8.1. Operating Frequency
The operating frequency of FC800L is shown in the following.
Table 1: Operating Frequency of the Module
Feature
2.4 GHz WLAN
5 GHz WLAN
Bluetooth
3.8.2. Pin Definition of RF Antenna Interface
Pin definitions of the antenna interface are shown in the following table:
Table 2: Pin Definition of RF Antenna Interfaces
Pin Name
Pin No.
ANT_BT
2
ANT_WIFI
9
3.8.3. Reference Design of RF Antenna Interfaces
FC800L module provides an RF antenna pin for Wi-Fi & Bluetooth antenna connection. The RF trace in
host PCB connected to the module's RF antenna pin should be microstrip line or other types of RF trace,
with characteristic impendence close to 50 Ω. FC800L module comes with grounding pins which are next
to the antenna pin to give a better grounding.
A reference circuit for the RF antenna interface is shown below. It is recommended to reserve a π-type
matching circuit for better RF performance, and ESD protection devices are designed at the same time.
Matching components C1, R1, L1~L4 and protection devices D1, D2 should be placed as close as possible
to the antenna. Inductors (L1~L4) are not installed by default.
FC800L_Hardware_Design
Frequency
2.400–2.4835
5.150–5.850
2.402–2.480
I/O
Description
AIO
Bluetooth antenna interface
AIO
Wi-Fi antenna interface 0
Wi-Fi&Bluetooth Module Series
Unit
GHz
GHz
GHz
Comment
50 Ω impedance
50 Ω impedance
30 / 50
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