Antenna Interface; Pin Definition Of Rf Antenna Interface; Operating Frequency; Reference Designs - Quectel FC21 Hardware Design

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
Pin Name Pin No.
GND 28
GND 29
RF_ANT 30
GND 31

3.7.2. Operating Frequency

Operating frequency is as bellow.
Table 17: Operating Frequency
Feature
2.4GHz WLAN
5GHz WLAN
BT 4.2

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.
FC21_Hardware_Design
I/O Description
Ground
Ground
IO Wi-Fi/BT antenna pad
Ground
Frequency
2.412~2.472
5.180~5.825
2.402~2.48
Wi-Fi&BT Module Series
FC21 Hardware Design
Comment
50Ω impedance
Unit
GHz
GHz
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]:
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