BM62 datasheet(40/70 Pages) MICROCHIP

40 / 70 page

BM62/64

DS60001403A - Page 40

 2016 Microchip Technology Inc.

FIGURE 6-2:

ANTENNA 3D RADIATION PATTERN AT 2441 MHZ

6.2

Module Placement Guidelines

For a Bluetooth product, the antenna placement

affects the performance of the whole system. The antenna

requires free space to radiate RF signals and it cannot be

surrounded by the ground plane. Microchip recommends

that the areas underneath the antenna on the host PCB

must not contain copper on top, inner, or bottom layer as

illustrated in Figure 6-1.

A low-impedance ground plane will ensure the best radio

performance (best range, lowest noise). The ground

plane can be extended beyond the minimum recommen-

dation, as required for the main PCB EMC noise reduc-

tion. For the best range performance, keep all external

metal at least 15 mm away from the on-board PCB trace

antenna.

Figure 6-3 and Figure 6-4 illustrate examples of good

and poor placement of the BM62/64 module on a host

board with GND plane.

TABLE 6-1:

BM62/64 ANTENNA

CHARACTERISTICS

Parameter

Values

Frequency

2400 MHz ~ 2480 MHz

Peak Gain

1.927 dBi

Efficiency

73.41%

BM62 Datasheet(PDF) 40 Page - Microchip Technology