Wi-Fi&Bluetooth Module Series
FC909A_Hardware_Design 34 / 49
Figure 11: Coplanar Waveguide Design on a 2-layer PCB
Figure 12: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground)
Figure 13: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground)
To ensure RF performance and reliability, the following principles shall be complied with RF layout
design:
Use an impedance simulation tool to accurately control the characteristic impedance of RF traces to
50
Ω.
The GND pins adjacent to RF pins should not be designed as thermal relief pads, and should be fully
