olemus
väga väikese energiatarbega seade,
toitub signaali kandvate elektromagnetlainete energiast

näiteid
https://ipo.llnl.gov/technologies/instruments-sensors-and-electronics/batteryless-sensor-using-nanoenergy-harvester

https://www.nature.com/articles/ncomms15032

https://aces-society.org/includes/downloadpaper.php?of=ACES_Journal_October_2018_Paper_12&nf=18-10-12

vt ka
- energiapüük
- Ethernet-toide