User Manual

Advanc
e
Information
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2015 Microchip Technology Inc.
page
27
BM78SPPS5MC2 , RN4678
12.0 ANTENNA PLACEMENT RULE
For Bluetooth product, antenna placement will affect whole system performance.
Antenna need free space to transmit RF signal, it can’t be surround by GND plane.
Here are some examples of good and poor placement on a Main Application board with GND plane.
FIGURE 12-1: KEEP OUT AREA SUGGESTION FOR ANTENNA
For more detail free space of antenna placement design, you can reference the design rule of
antenna produce vendor.