Data Sheet

Hangzhou Grom Technology Co.,Ltd.
Add: Room800,Building3#,Longtan Rd 16#,Cangqian street, Hangzhou City, China. 311121
Website：www.gromiot.com 9
2.4. Antenna Specifications
2.4.1 Use U.FL to connect external antenna:
Picture 2-3. U.FL connector
2.4.2 Integrated ceramic antenna:
Picture 2-4. Ceramic antenna
Attention when using ceramic antenna：
1. Please avoid installing the module in a complete metal enclosure.
2. Please avoid placing high profile components/metal next to antenna （1 cm at least,
suggest more than 2.7 cm）.
3. ZigBee module should not be placed next to consumer electronics which might
interfere with ZigBee's RF frequency band, like transformer.
User should try to avoid other components or line interfere ceramic antenna when
designing board：
 Wires or other components avoid surrounding ceramic antenna
 Ceramic antenna should be extended to the board
 Don’t use metal shell to cover the PCB antenna
******Soldering way for convert ceramic antenna to U.FL:
U.FL soldering way：C3=2.7nh, R4=NC, R3=2.7pF, C16=2.7nh
Picture 2-4. Components Location
Ceramic antenna
U.FL connector