Need 2-layer reference design for 433MHz LoRa

[comisarpetzi]

Hello,

the reference design STDES-WL5U2SBB (MB1791) specifies a frequency range between 470-530 MHz. I plan to run LoRa on 433MHz with 10 dBm. I do not wish to use a 4-layer PCB in my product design. This seems to be the only version that has 2-layers and falls roughly within the frequency range.

I am using the STM32WL55CCU6.

Would this design still work with 433/434 MHz?

Best Regards,
Daniel

PS. I have manufactured the 868MHz MB1874-LP and this works great.

[Sarra.S]

Hello @comisarpetzi 

Looking at Table 2 in the data brief, all the designs that target [433 MHz]/15 dBm, are 4-layer PCBs. 

433MHz is still considered to be part of the Lower Band, but the actual compatibility can depend on various factors including the configuration of the LoRa modulation, the antenna design, and the surrounding RF environment.