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Quectel BC66 - Reference Design of RF Layout

Quectel BC66
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NB-IoT Module Series
BC66 Hardware Design
BC66_Hardware_Design 38 / 59
Module
RF_ANT
R1 0R
C1
NM
C2
NM
GND
GND
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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