Automotive Module Series
AG525R-GL QuecOpen
Hardware Design
AG525R-GL_QuecOpen_Hardware_Design 73 / 104
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
NOTES
