Reference Design Of Rf Routing - Quectel EG915U-EU Manual

LTE Standard Module Series

5.2. Reference Design of RF Routing

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,
height from the reference ground to the signal layer (H), and the space 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 28: Microstrip Design on a 2-layer PCB
Figure 29: Coplanar Waveguide Design on a 2-layer PCB
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