Antenna Requirements; Reference Design Of Rf Layout - Quectel NB-IoT Module Series Hardware Design

4.1.2. Antenna Requirements

To minimize the loss on RF trace and RF cable, please pay attention to the antenna design. The following
tables show the requirements on NB-IoT antenna.
Table 14: Antenna Cable Insertion Loss Requirements
Band
LTE B5/B8/B12*/B13*/B17*/
B18*/B19*/B20/B26*/B28*
LTE B1/B2*/B3/B25*/B66*
NOTE
"*" means under development.
Table 15: Required Antenna Parameters
Parameters
Frequency Range
VSWR
Gain (dBi)
Max Input Power (W)
Input Impedance (Ω)
Polarization Type

4.1.3. Reference Design of RF Layout

For user's PCB, the characteristic impedance of all RF traces should be controlled as 50Ω. The
impedance of the RF traces is usually determined by the trace width (W), the materials' dielectric constant,
the distance between signal layer and reference ground (H), and the clearance between RF trace and
ground (S). Microstrip line or coplanar waveguide line is typically used in RF layout for characteristic
impedance control. The following are reference designs of microstrip line or coplanar waveguide line with
different PCB structures.
BC66_Hardware_Design
Requirements
Cable Insertion loss <1dB
Cable Insertion loss <1.5dB
Requirements
Depend on the frequency band(s) provided by the network operator
≤2
1
50
50
Vertical
NB-IoT Module Series
BC66 Hardware Design
34 / 50