Product Info

Wi-Fi&BT Module Series
AF50T Hardware Design
AF50T_Hardware_Design 28 / 52
3.10. RF Antenna Interfaces
The following table shows the pin definition of RF antenna interfaces.
Table 15: Pin Definition of RF Antenna Interfaces
Pin Name Pin No. I/O Description Comment
ANT_WIFI0 28 IO BT and 2.4/5 GHz WLAN antenna interface 0 50 Ω impedance
ANT_WIFI1 33 IO 2.4/5 GHz WLAN antenna interface 1 50 Ω impedance
ANT_BT 25 IO Reserved dedicated BT antenna interface 50 Ω impedance
3.10.1. Operating Frequency
Table 16: Operating Frequency of the Module
Feature Frequency Unit
2.4 GHz WLAN
2.412–2.472
GHz
5 GHz WLAN
5.180–5.825
GHz
BT
2.402–2.480
GHz
3.10.2. Reference Design of RF Antenna Interfaces
AF50T module provides three RF antenna interfaces for antenna connection. A reference circuit design
for an RF antenna interface is shown below.
It is recommended to reserve a π-type and LCs matching circuit for better RF performance, and add a
TVS for ESD protection. the π-type matching components (C3, C4, and R1), the LCs (C1, C2, L1 and L2)
and TVS (D1) should be placed as close to the antenna as possible. The capacitors and inductors are not
mounted by default. the parasitic capacitance of TVS should be less than 0.05 pF