SeeedStudio 101990885, User Manual

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2.2 using the wiring
diagram
Fig. 3 Schematic diagram of the radar module and peripheral connections
3. Antenna and housing layout requirements
PCBA: Mount the radar ≥1mm higher than the other devices.
Case: Keep 2-5mm between the radar antenna and other shell surfaces.
Case detection surface: To avoid coverage area performance, keep the non-metallic
case flat and straight to avoid bending.
Fig. 4 Schematic diagram of the radar module and peripheral connections