Guidance Request: Improving RF Range for STM32WB55RGV7 Design

[Priya1]

Dear STMicroelectronics Support Team,

I hope this message finds you well.

We are currently using the STM32WB55RGV7 MCU as per your datasheet recommendation, we have designed RF1 Section with a Low-Pass Filter circuit, Like below attached image.

This circuit covered range was very low with Low pass Filter.

 

-The RF distance covered as very low distance compared with another one board with the same STM32WB55RGV7 MCU with band Pass filter Circuit. here I have included the Schematic image below.

Below attached Circuit was highest range covered circuit with Band pass filter,

 

-If I want to increase the RF Range in this circuit, which one is the best method, and what is different between Band pass and low pass Filter ?

 

 

[STTwo-32]

Hello @Priya1 

For the best RF performance, I suggest you follow the recommendations of the chapter 5.3.1 of the AN5165.

Best Regards.

STTwo-32