The term you want to Google is "backscatter" I think. I reckon this might have been what you were looking for: https://www.washington.edu/news/2017/12/05/in-fir

The term you want to Google is "backscatter" I think. I reckon this might have been what you were looking for: https://www.washington.edu/news/2017/12/05/in-first-3-d-printed-objects-connect-to-wifi-without-electronics/ https://www.washington.edu/news/2017/12/05/in-first-3-d-prin...