Espressif Systems ESP32 Design Manuallines page 13

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�� Note:
As shown in Figure 2-3, the recommended position for an ESP32 module on the baseboard is:
Position 3: Highly recommended.
Position 4: Recommended.
Position 1, 2, 5: Not recommended.
If the recommended positioning requirements cannot be met, please at least make sure
that the module is not covered by any metal shell, and the module's antenna area plus 15
mm outwards is kept clear (no copper, routing, components) as shown in Figure 2-4.
The module's antenna area should be as far away from other parts as possible, especially
from the audio output. The antenna area is recommended to be in the opposite direction of
the audio output, or at least at 90 degrees if the former cannot be satisfied. For example:
Espressif
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Figure 2-3. ESP32 Module Antenna Position on Baseboard
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Figure 2-4. Clearance Zone for ESP32 Module's Antenna on the Baseboard
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2. PCB Layout Design
2019.01