Data Sheet

to inner GND plane. If GND flood copper underside the module then connect
with GND vias to inner GND plane.
 Even when above mentioned condition is satisfied, communication performance
may be significantly deteriorated depending on the structure of the product.
Bluetooth range performance is degraded if a module is placed in the middle of
the main board.
 For main board layout:
o
Avoid running any signal line below module whenever possible.
o No ground plane below antenna.
o
If possible, cut-off the portion of main board below antenna.
Other module mounting examples
Placement of resin or plastic parts