Quectel BC65 - Reference Design of RF Layout

NB-IoT Module Series
BC65 Hardware Design
BC65_Hardware_Design 37 / 55
Table 19: Required NB-IoT Antenna Parameters
4.2. 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 trace and
ground (S). Microstrip or coplanar waveguide is typically used in RF layout for characteristic impedance
control. The following are reference designs of microstrip or coplanar waveguide with different PCB
structures.
.
Figure 24: Microstrip Design on a 2-layer PCB
Figure 25: Coplanar Waveguide Design on a 2-layer PCB
Parameters
Requirements
Frequency range
703–2170 MHz
VSWR
≤ 2
Efficiency
> 30 %
Max input power (W)
50
Input impedance (Ω)
50