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BM78 Datasheet(PDF) 45 Page - Microchip Technology |
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BM78 Datasheet(HTML) 45 Page - Microchip Technology |
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45 / 60 page  2016 Microchip Technology Inc. Advance Information DS60001380A-Page 45 BM78 8.0 MODULE PLACEMENT For a Bluetooth wireless product, the antenna place- ment 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. Microchip recommends that the areas underneath the antenna on the host PCB should not contain copper on top, inner, or bottom layer. Figure 8-1 illustrates an example of good and poor antenna placement on a host PCB with ground plane. The ground plane can be extended beyond the mini- mum 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 8-1: MODULE PLACEMENT EXAMPLES TABLE 8-1: RECOMMENDED ANTENNA Description Manufacturer Part Number Manufacturer ANT ANT3216A063R2400A PIFA 2.4GHZ L3.2W1.6 ANT3216A063R2400A YAGEO |
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