Data Sheet

W M B T 0 1 ( - s , - s c ) D a t a s h e e t
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8.3. MODULE PLACEMENT EXAMPLES
For a Bluetooth wireless product, the antenna placement affects the performance of
the whole system. The antenna requires free space to radiate the RF signal and it
cannot be surrounded by the ground plane.
Seeed recommends that the areas underneath the antenna on the host PCB should
not contain copper on top, inner, or bottom layer.
The ground plane can be extended beyond the minimum recommended as required
for the main PCB EMC noise reduction. For the best range performance, keep all
external metal away from the ceramic chip antenna that is minimum 15 mm away.
Figure 11 illustrates an example of good and poor antenna placement on a host PCB
with ground plane.
Figure 11 module placement