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The power scavenging circuit looks to not be the same frequency as the communications radio circuit due to antenna size differences. Likely it's harvesting pow
by bradfa 12y ago
The power scavenging circuit looks to not be the same frequency as the communications radio circuit due to antenna size differences. Likely it's harvesting power from 2.4 GHz or similar frequency and then using the higher (24 GHz-ish) band for comms. With a decent meshing protocol this would be quite interesting, although latency with many many short hops will be horrid.
- bravo22 12y agoThe antenna is way too small for 2.4GHz. It makes sense for higher frequency (60GHz or whatever he said in the video). You can power harvest RF waves straight up but what you absorb gives you very little to rebroadcast again. There are others doing work on this for sensors you could embed into say a wall to give you the pressure reading of the concrete (a simple piezo say) but those usually modulate an RF wave (similar to NFC) instead of rebroadcasting.
- bravo22 12y agoThe antenna is way too small for 2.4GHz. It makes sense for higher frequency (60GHz or whatever he said in the video). You can power harvest RF waves straight up but what you absorb gives you very little to rebroadcast again. There are others doing work on this for sensors you could embed into say a wall to give you the pressure reading of the concrete (a simple piezo say) but those usually modulate an RF wave (similar to NFC) instead of rebroadcasting.