User's Manual

LTE Module Series
BG96-NA Hardware Design
BG96-NA_Hardware_Design Confidential / Released 45 / 64
ANT_MAIN
R1 0R
C1
Module
Main
antenna
NM
C2
NM
Figure 23: Reference Circuit of RF Antenna Interface
Place the π-type matching components (R1, C1, C2) as close to the antenna as possible.
5.1.4. Reference Design of RF Layout
For user’s PCB, the characteristic impedance of all RF traces should be controlled as 50 ohm. 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.
Figure 24: Microstrip Line Design on a 2-layer PCB
NOTE