Positioning An Esp32-S2 Module On A Base Board - Espressif Systems ESP32-S2 Hardware Design Manuallines

3. PCB Layout Design
oscillator part. It is acceptable to route signal traces on this layer, provided that there is a complete GND
plane under the RF and crystal oscillator.
• The fourth layer is the BOTTOM layer, where power traces are routed. Placing any components on this layer
is not recommended.
Below are the suggestions for a two-layer PCB design.
• The first layer is the TOP layer for traces and components.
• The second layer is the BOTTOM layer. Please do not place any components on this layer and keep traces
to a minimum. Ideally, it should be a complete GND plane.
3.2 Positioning an ESP32­S2 Module on a Base Board
If users adopt module-on-board design, they should pay attention to the layout of the module on the base board.
The interference of the base board on the module's antenna performance should be minimized.
The module should be placed as close to the edge of the base board as possible. The PCB antenna area should
be placed outside the base board whenever possible. In addition, the feed point of the antenna should be closest
to the board, as Figure 11
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Figure 11: ESP32­S2 Module Antenna Position on Base Board
Note:
As is shown in Figure 11, the recommended position of ESP32-S2 module on the base board should be:
• Position 3, 4: Highly recommended;
• Position 1, 2, 5: Not recommended.
If the positions recommended are not feasible, please make sure that the module is not covered by any metal shell.
Besides, 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 Figure 12.
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