Espressif Systems ESP8684 Series, Руководство по проектированию аппаратного обеспечения, Страница: 16 / 28

3 PCB Layout Design
The module should be placed as close to the edge of the base board as possible. The side of the module
carrying the on-board PCB antenna should be placed outside the base board whenever possible. In addition, the
feed point of the antenna should be closest to the board. In the following example figures, positions with mark
✓
are strongly recommended, while positions without a mark are not recommended.
1 2 3
4 5
Base board
Feed Point
Figure 10: Placement of ESP8684 Modules on Base Board
If the positions recommended are not feasible, please make sure that the module is not covered by any metal
shell. Besides, the clearance area outside the antenna should be kept clean (namely no copper, routing,
components on it) and as large as possible, as shown in Figure 11 . If there is base board under the antenna area,
it is recommended to cut it off to minimize its impact on the antenna.
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ESP8684 Series Hardware Design Guidelines v1.1