Rf Routing Guidelines - Quectel RG520N-AT Hardware Design

requirement.
2. If the module is designed with a passive antenna, then the VDD circuit is not needed.
3. Keep the characteristic impedance for ANT_GNSS trace as 50 Ω.
π-type
4. Place the
5. Keep digital circuits such as (U)SIM card, USB interface, camera module, display connector and SD
card away from the antenna traces.
6. The isolation between each antenna trace on PCB is recommended to be more than 75 dB.
7. Keep at least 15 dB isolation between GNSS and cellular antennas to improve the receiving
sensitivity.

5.3. RF Routing Guidelines

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 materials' dielectric constant,
the height from the reference ground to the signal layer (H), and the spacing 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 waveguide with different PCB
structures.
RG520N-AT_Hardware_Design
matching components as close to the antenna as possible.
Figure 38: Microstrip Design on a 2-layer PCB
5G Module Series
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