Positioning A Esp32 Module On A Base Board - Espressif Systems ESP32 Hardware Design Manuallines

2. SCHEMATIC CHECKLIST AND PCB LAYOUT DESIGN
• The second layer is the BOTTOM layer, where power traces are routed. Placing any components on this
layer is not recommended. Do not route any power or signal traces under or around the RF and crystal
oscillator, so that there is a complete GND plane, which is connected to the Ground Pad at the bottom of
the chip.

2.2.1.2 Positioning a ESP32 Module on a Base Board

If users adopt on-board design, they should pay attention to the layout of the module on the base board. The inter-
ference of the base board on the module's antenna performance should be reduced as much as possible.
It is recommended that the PCB antenna area of the module be placed outside the base board while the module
be put as close as possible to the edge of the base board so that the feed point of the antenna is closest to the
board.
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5
Note:
As is shown in Figure 11, the recommended position of ESP32 module on the base board should be:
• Position 3: Highly recommended;
• Position 4: Recommended;
• Position 1, 2, 5: Not recommended.
If the positions recommended are not suitable, please make sure that the module is not covered by any metal
shell. The antenna area of the module and the area 15 mm outside the antenna should be kept clean, (namely no
copper, routing, components on it) as shown in the Figure 12:
Espressif Systems
Figure 11: ESP32 Module Antenna Position on Base Board
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Base Board
15 ESP32 Hardware Design Guidelines V2.1
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