Wi-Fi&Bluetooth Module Series
FCM561D-P_Hardware_Design
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5.3.1.3.
RF Routing Guidelines
For user’s PCB, the characteristic impedance of all RF traces should be controlled to 50 Ω. The
impedance of the RF traces is usually determined by the trace width (W), the materials’ dielectric
constant, the height from the reference ground to the signal layer (H), and the spacing between RF
traces and grounds (S). Microstrip or coplanar waveguide is typically used in RF layout to control
characteristic impedance. The following are reference designs of microstrip or coplanar waveguide with
different PCB structures.
Figure 12: Microstrip Design on a 2-layer PCB
Figure 13: Coplanar Waveguide Design on a 2-layer PCB
Frequency Range (GHz)
2.400
–2.4835
Cable Insertion Loss (dB)
< 1
VSWR
≤ 2 (Typ.)
Gain (dBi)
1 (Typ.)
Max. input power (W)
50
Input impedance (
Ω)
50
Polarization type
Vertical
