Reference Design Of Rf Layout - Quectel AF51Y Hardware Design

Wi-Fi&Bluetooth Module Series
R1
0R
RF_ANT
NM
C2
AF51Y
NM
C3
L1 NM
C4 NM
L2 NM
NM
C1
Figure 10: Reference Circuit for RF Antenna Interfaces

3.10.3. Reference Design of RF Layout

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 11: Microstrip Design on a 2-layer PCB
Figure 12: Coplanar Waveguide Design on a 2-layer PCB
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