Reference Design Of Rf Layout - Quectel BG95 Series Hardware Design

LPWA Module Series
BG95 Hardware Design
Figure 22: Reference Circuit of RF Antenna Interface

5.1.4. 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 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 23: Microstrip Line Design on a 2-layer PCB
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