User's Manual

FLC-BTM403 Datasheet
Flaircomm Microelectronics Confidential
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8. Recommended PCB Layout and Mounting Pattern
A very important factor in achieving maximum Bluetooth performance is the placement of a module
with on-board antenna designs onto the carrier board and corresponding PCB layout. There should
be no any trace, ground and vias in the area of the carrier board underneath the module’s on-board
antenna section as indicated in Figure 20. Antenna portion of the module must be placed at least
20mm away from any metal part and the antenna should not be covered by any piece of metal. The
antenna of the module MUST be kept as far from potential noise sources as possible and special care
must also be taken with placing the module in proximity to circuitry that can emit heat. The RF part
of the module is very sensitive to temperature and sudden changes can have an adverse impact on
performance.
Figure 20: Leave 20mm Clearance Space from the Module Built-in chip Antenna