User's Manual

BL652
Datasheet
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
49
© Copyright 2016 Laird. All Rights Reserved
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
 The BL652-SA antenna is tuned when BL652-SA is sitting on development board (host PCB) with size of 120
mm x 93 mm.
 A different host PCB thickness dielectric will have small effect on antenna.
 The antenna-keep-out defined in the Host PCB Land Pattern and Antenna Keep-out for BL652-SA section.
 Host PCB land pattern and antenna keep-out for the BL652 applies when the BL652-SA is placed in the
corner of the host PCB. When BL652-SA cannot be placed as such, it must be placed on the edge of the host
PCB and the antenna keep out must be observed. Figure 9 shows an example.
Figure 9: Antenna keep-out area (shown in red), corner of the BL652 development board for BL652-SA module.
Antenna Keep-out Notes:
Note 1
The BL652 module is placed on the edge of the host PCB.
Note 2
Copper cut-away on all layers in the Antenna Keep-out area under BL652 on host PCB.
6.3.2 Antenna Keep-out and Proximity to Metal or Plastic
Checklist (for metal /plastic enclosure):
 Minimum safe distance for metals without seriously compromising the antenna (tuning) is 40 mm
top/bottom and 30 mm left or right.
 Metal close to the BL652-SA chip monopole antenna (bottom, top, left, right, any direction) will have
degradation on the antenna performance. The amount of that degradation is entirely system dependent,
meaning you will need to perform some testing with your host application.
BL652-SA module
Antenna Keep
-out