User's Manual

BT900-Sx Hardware Integration Guide
Intelligent BTv4.0 Dual Mode Module
Americas: [phone] Option 2
Europe: [phone]
Hong Kong: [phone]
www.lairdtech.com/bluetooth
33 CONN-HIG-BT900
Note: 1. BT900 module placed on edge of host PCB.
2. Copper cut-away on all layers in “antenna Keep-out” area under BT900 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
40mm top/bottom and 30mm left or right.
 Metal close to the BT900-SA chip monopole antenna (bottom, top, left, right, any direction)
will have 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,
radiation efficiency).
 It is best that the customer tests the Range with mock-up (or actual prototype) of the
product to assess effects of enclosure height (and material whether metal or plastic).
6.4 External Antenna Integration with BT900-SC
Please refer to the regulatory sections for FCC, IC, CE, and Japan for details of use of BT900-Sx
with external antennas in each regulatory region.
The BT900 family has been designed to operate with the below external antennas (with a
maximum gain of 2.0 dBi). The required antenna impedance is 50 ohms. See Table 19.
External antennas improve radiation efficiency.
Table 19: External antennas for the BT900
External Antenna Part
Number
Mfg. Type Gain (dBi) Connector
Type
BT900 Part
number
S181FL
-
L
-
RMM
-
2450S
Nearson
Dipole
2.0
uFL
Note1
BT900
-
SC
EBL2449A1
-
15UFL
Laird
PCB
Dipole
2.
0
uFL
Note1
BT900
-
SC
MAF94
190
Laird
Dipole
2.0
uFL
BT900
-
SC
MAF94019
Laird
Dipole
1.5
uFL
BT900
-
SC
Note 1:
Antenna manufacturer Laird contact information:
Sales:
Tel:
Email: