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 mate
rials’ dielectric constant,
the height
from the reference ground to the signal layer (H)
, and the spacing between RF trace and
g
round (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
