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Associate II
May 7, 2025
Question

STM32WB5MMG Antenna Placement relative to a LoRa antenna

  • May 7, 2025
  • 1 reply
  • 310 views

I am desiring to place the STM32WB5MMG on a board design that already has a large LoRa Antenna. I am reviewing the datasheet and reading over the design suggestions for placing the module. 

In particular, I am trying to implement the design with this guidance: 

Hbburnha_0-1746639776189.png

Where d is 22 mm and c is 27 mm. I am trying to decide between two different design choices. 

Option A:

Hbburnha_1-1746639902214.png

Option B:

Hbburnha_2-1746639920801.png

In both options I can satisfy the conductive enclosure requirements above, but I prefer option B since it will be easier to route. However I am concerned about placing one Antenna so close to another antenna. 

Will my LoRa antenna affect the STM32MMWB5MMG Antenna negatively in the second design?

1 reply

STTwo-32
Technical Moderator
May 26, 2025

Hello @Hbburnha 

For such a recommendation, I suggest you have a look at this training and the AN5165. You can also try to find a RF design expert that may give you a recommendation for the best solution.

Best Regards.

STTwo-32