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5
. Physical Dimensions and PCB Layout
5.2
PCB
Layout
5.2.1
Recommended
PCB
Land
Pattern
16
23
5
5
0.6
1.2
1.2
16
0.6
15.4
13.8
12.4
11.6
10.8
15.4
13.8
12.4
11.6
10.8
Antenna Area
Unit: mm
: Pad
Figure
5
:
Recommended
PCB
Land
Pattern
5.2.2
PCB
Layout
Guide
To achieve the optimum RF performance on a device with on-board antenna, please follow the guidelines be-
low.
The module uses an inverted-F antenna design, and the antenna area of the module should have specific placement
against the base board. The feed point of the antenna should be as close to the board as possible. The PCB
antenna area should be placed outside the base board whenever possible while the module be put as close as
possible to the edge of the base board.
As is shown in Figure
, examples 3 and 4 of the module position on the base board are highly recommended,
while examples 1, 2, and 5 are not recommended.
Espressif Systems