Quectel Smart Wi-Fi Module Series, User Manual, Page: 23 / 43

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Figure 10: Reference Circuit Design for Wi-Fi/BT Anternna
Place the
π-type 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 as 50Ω. The
impedance of the RF traces is usually determined by the trace wid
th (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 11: Microstrip Line Design on a 2-layer PCB
Figure 12: Coplanar Waveguide Line Design on a 2-layer PCB
NOTE: