Reference Design Of Rf Layout - Quectel QuecOpen AG521R-NA Hardware Design

Automotive Module Series
AG521R-NA QuecOpen Hardware Design
ANT_DIV function is enabled by default. AT+QCFG="diversity",0 command can be used to disable receive
diversity. See document [3] for details of the command.

4.1.4. Reference Design of RF Layout

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.
Figure 32: Microstrip Design on a 2-layer PCB
Figure 33: Coplanar Waveguide Design on a 2-layer PCB
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