Layout Guidelines; Rf Routing Guidelines - Quectel BG95 A-GL Series Hardware Design

5.3. Layout Guidelines

The following layout guidelines should be taken into account in application designs.
Maximize the distance between the GNSS antenna and the main antenna.

Digital circuits such as (U)SIM card, USB interface, camera module, display connector, and SD card

should be kept away from antennas.
Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar

isolation and protection.
Keep 50 Ω characteristic impedance for the ANT_GNSS trace.
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Refer to Chapter 5.2 for GNSS antenna reference design and antenna installation information.

5.4. RF Routing Guidelines

For user's PCB, the characteristic impedance of all RF traces should be 50 Ω. The impedance of the RF
traces is usually determined by trace width (W), the materials' dielectric constant, the height from the
reference ground to the signal layer (H), and the space between RF traces and grounds (S). Microstrip or
coplanar waveguide is typically used in RF layout to control characteristic impedance. The following are
reference designs of microstrip or coplanar waveguides with different PCB structures.
BG95xA-GL_Hardware_Design
Figure 33: Microstrip Design on a 2-Layer PCB
LPWA Module Series
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