Reference Design Of Rf Layout - Quectel BC66 Hardware Design

NB-IoT Module Series
BC66 Hardware Design
GND R1 0R
RF_ANT
GND
C1 C2
Module
NM NM
Figure 24: Reference Design of NB-IoT Antenna Interface

4.4. Reference Design of RF Layout

For users' PCB, the characteristic impedance of all RF traces should be controlled to 50Ω. 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 clearance 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 25: Microstrip Design on a 2-layer PCB
Figure 26: Coplanar Waveguide Design on a 2-layer PCB
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