Quectel LTE Cat M1 & Cat NB2 & EGPRS Module : Product Info : Page 59

LPWA Module Series

BG600L-M3 Hardware Design

BG600L-M3_Hardware_Design 58 / 83

Figure 25: Reference Design of Main Antenna Interface

4.1.4 Reference Design of RF Layout

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,

the height from the reference ground to the signal layer (H), and the spacing 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 26: Microstrip Design on a 2-layer PCB