User's Manual

Wi-Fi&Bluetooth Module Series
FC41D_Hardware_Design
27 / 46
3.13.4. IPEX Connector
The mechanic size of the IPEX connector
(MPN: 20579-001E, MHF 4L Receptacle) provided by the
FC41D module are as follows.
Figure 10: IPEX Connector Size
3.13.5. RF Antenna Reference Design
FC41D module is equipped with RF antenna pad for connecting Wi-Fi/Bluetooth antennas. The RF trace
between main PCB and the module RF antenna pin must be the microstrip line or other types of RF trace,
and the characteristic impedance should be close to 50 Ω. The GND pin of FC41D series module is close
to the antenna solder pad for better grounding effect.
The circuit of RF antenna interface is shown below. In order to achieve better RF performance, it is
necessary to reserve LC and π matching circuit. Matching components such as R1, L1, C1, C2, C3
should be placed as close to the antenna as possible, L1, C1, C2, C3 is not mounted by default.