Smart Module Series
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6.5. Reference Design of RF Layout
For user’s PCB, the characteristic impedance of all RF traces should be controlled as 50 Ω. The
impedance of the RF traces is usually determined b
y the trace width (W), the materials’ dielectric constant,
the distance between signal layer and reference ground (H), and the clearance between RF trace and
ground (S). Microstrip line or coplanar waveguide line is typically used in RF layout for characteristic
impedance control. The following are reference designs of microstrip line or coplanar waveguide line with
different PCB structures.
Figure 34: Microstrip Line Design on a 2-layer PCB
Figure 35: Coplanar Waveguide Line Design on a 2-layer PCB
