Hi,

    一般2D pattern 按x,y,z方向有三个切面做发射扫描，然后再在这三个面内不同的转角上有不同的增益和天线效率，这样就形成了2D方向图。

谢谢！

Jun

Hi,

    Please keep the gap as big as possible between antenna and plastic case. It recommends to leave the gap over 3-5 mm.

Regards,

Jun

Hi, 

    Basically there is no problem with your calculation method. But the battery life is heavily related to your application.  The packet longth, data rate, output power, duty cycle, and sleep mode factors impact the battery life. I think you can get 1 year life base on these factors' appropriate configuration.

Regards,

Jun

Hi,

     The 2.4GHz Zigbee only supports DSSS-OQPSK modulation. When you configure the chip into Zigbee protocol, the modulation is set this modulation automatically.

Regards,

Jun

Hi Vegard,

     What's your performance difference requirements between 868MHz and 915MHz?  I think you can use each reference circuits for both band if the difference < 1dB. You can compare it if you have the demo boards. You can get refer to following application note for the reference circuits: https://www.silabs.com/documents/public/application-notes/AN648.pdf

Regards,

Jun

Hi,

    You can use 868MHz reference design for your 865-867MHz band. Please read the following application note for reference circuits:

https://www.silabs.com/documents/public/application-notes/AN648.pdf

Regards,

Jun

Hi Drauzio,

     There is no data for noise figure with EFR32MG chip. But it recommends to use the external LNA to improve the sensitivity, the sensitivity maybe 3-5dB improved according to your external LNA's noise figure.

     For the SAW usage, it recommends to use if there is strong interfere close to carrier. Please refer to the blocking performance of the chip to decide the SAW usage.

Regards,

Jun

Hi,

     You should connect it with setting  'Debug Mode' to Out. Please try to connect your customer board to BRD4001A with 10-pin mini simplicity debug connector for a try.

Regards,

Jun

You should connect these debug signals to P800 connector of BRD4001A, and power your custom board with external power supply since the pin1 of P800 is only for detect and not for power.

Regards,

Jun

Hi,

    It is possible damaged by EOS or ESD. Please contact your local FAE or sales man for further RMA analyse.

Regards,

Jun