Reference Design Of Rf Layout - Quectel BC66 Hardware Design

NB-IoT Module Series
BC66 Hardware Design
A reference design of the RF interface is shown as below.
GND R1 0R
RF_ANT
GND
C1 C2
Module
NM NM
Figure 23: Reference Design of NB-IoT Antenna Interface

4.4. 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 height 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.
.
Figure 24: Microstrip Line Design on a 2-layer PCB
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