Reference Design Of Rf Layout - Quectel SC20-WL Hardware Design

Smart Wi-Fi Module Series
SC20-WL Hardware Design
NOTE
π-type
Place the matching components (R1, C1, C2) as close to the antenna as possible.

5.1.1. Reference Design of RF Layout

For user's PCB, the characteristic impedance of all RF traces should be controlled to 50Ω. The
impedance of the RF traces is usually determined by the trace width (W), the materials' dielectric constant,
height from the reference ground to the signal layer (H), and the clearance 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 30: Microstrip Design on a 2-layer PCB
Figure 31: Coplanar Waveguide Design on a 2-layer PCB
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