Product Info

Wi-Fi&BT Module Series
FC21 Hardware Design
FC21_Hardware_Design 28 / 52
3.7. Antenna Interface
Pin 30 is the RF antenna pad. And the RF port has an impedance of 50Ω.
3.7.1. Pin Definition of RF Antenna Interface
Table 16: Pin Definition of RF Antenna Interface
3.7.2. Operating Frequency
Operating frequency is as bellow.
Table 17: Operating Frequency
3.7.3. Reference Designs
FC21 module provides an RF antenna pad for Wi-Fi/BT 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, with
characteristic impendence close to 50Ω. FC21 module comes with grounding pads which are next to the
antenna pad in order 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. The capacitors are not mounted by default.
Pin Name Pin No. I/O Description Comment
GND 28 Ground
GND 29 Ground
RF_ANT 30 IO Wi-Fi/BT antenna pad 50Ω impedance
GND 31 Ground
Feature Frequency Unit
2.4GHz WLAN 2.412~2.472 GHz
5GHz WLAN 5.180~5.825 GHz
BT 4.2 2.402~2.48 GHz
批注 [RL12]: 中文里有这个射
频天线 Layout 参考指导章节，
是否需要添加
批注 [RL13R12]: