Implementation Note; Pcb Layout On Host Pcb - Laird BT800 series Hardware Integration Manual

BT800 Hardware Integration Guide
Version 0.2
13 I
MPLEMENTATION NOTE
13.1

PCB Layout on Host PCB

Checklist (for PCB):
MUST locate BT800/BT810 module close to the edge of PCB.
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Use solid GND plane on inner layer (for best EMC and RF performance).
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Place GND vias close to module GND pads as possible
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Route traces to avoid noise being picked up on VCC supply.
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Antenna Keep-out area:
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Ensure there is no copper in the antenna keep-out area on any layers of the host PCB.
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Keep all mounting hardware and metal clear of the area to allow proper antenna radiation.
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For best antenna performance, place the BT800 module on the edge of the host PCB,
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preferably in the corner with the antenna facing the corner.
A different host PCB thickness dielectric will have small effect on antenna.
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Figure 18: Recommend Antenna keep-out area (in White) used on the BT800
13.1.1 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 40mm
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top/bottom and 30mm left or right.
Metal close to the BT800 chip monopole antenna (bottom, top, left, right, any direction) will have
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degradation on the antenna performance. How much; that is entirely system dependent which
means some testing by customer required (in their host application).
Anything metal closer than 20mm will start to significantly degrade performance (S11, gain,
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radiation efficiency).
It is best that the customer tests the Range with mock-up (or actual prototype) of the product to
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assess effects of enclosure height (and material whether metal or plastic).
Americas: +1-800-492-2320 Option 2
Europe: +44-1628-858-940
Hong Kong: +852-2923-0610
www.lairdtech.com/bluetooth
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