WT11i-A-AI4 Bluegiga Technologies, WT11i-A-AI4 Datasheet - Page 16

• Manufacturer Part Number: WT11i-A-AI4
• Description: Bluetooth / 802.15.1 Modules WT11i Class1 2.1+EDR Chip Ant, iWRAP 4.0
• Manufacturer: Bluegiga Technologies

Specifications of WT11i-A-AI4

• Rohs: yes
• Class: 1
• Frequency Band: 2.4 GHz
• Sensitivity: - 83 dBm
• Operating Supply Voltage: 3.3 V
• Output Power: 17 dBm
• Interface Type: GPIO, UART, USB
• Antenna Connector Type: Chip
• Maximum Operating Temperature: + 85 C
• Dimensions: 35.8 mm x 14.5 mm x 2.3 mm
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

4 Layout Guidelines
WT11i is pin compatible with WT11 despite of slightly different external dimensions. For new design it
recommended to follow the land pattern shown in the figure below.
Figure 11: Recommended PCB land pattern for WT11i
Do not place any copper under the antenna. The minimum recommended keep out area is shown in the figure
12. Any dielectric material in close proximity to the antenna will effect on the impedance matching of the
antenna by lowering the resonance frequency. Figure 13 shows how different FR4 thickness under the
antenna effect on the resonance frequency. Recommended PCB thickness for the PCB is 1.6 mm – 2.8 mm.
Avoid placing plastic cover closer than 3 mm from the antenna as this will also tune the resonance frequency
downwards.
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