- no battery needed! [RFID and Contactless Technology](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3802/RFIDandContactlessTechnology.pdf)

[PHYSICS BEHIND RFID SMART CARD SECURITY IN CONTEXT OF PRIVACY](https://pdfs.semanticscholar.org/1895/7854a72b34349872563d48b91337906c86ea.pdf) MSc Thesis

> radiated power in the form of air-pressure variations of 10^(-6) watts at 400 cps
[Communication by Means of Reflected Power](https://pdfs.semanticscholar.org/778e/09875edcabd7d9c5a5425e7b5788882ee9cc.pdf)

- [Wi-Fi Backscatter: Internet Connectivity for RF-Powered Devices](http://iotwifi.cs.washington.edu/files/wifiBackscatter.pdf)

## decisive niches for low-energy harvesters??

[Radio-Frequency Rectifier for Electromagnetic Energy Harvesting: Development Path and Future Outlook](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3747/RF%2Benergy%2Bharvesting.pdf)
> The MTJ technology using MgO barrier is only ten years
> old, but it is already manufactured for massive MRAM
> applications. Although the fabrication process of spindiode
> is very complex, spindiode can benefit from a large market
> of MRAM that could guarantee an easy fabrication,
> eventually at a lower cost. From the understanding of
> rectification mechanisms, MTJ is clearly favored by the
> spin-dependent transport, and even if actual responsivity is
> very low because of a weak nonlinearity with the current
> spindiode samples available to us, a high responsivity is
> expected if the spindiode can be engineered to meet the
> requirements of nonlinearity. In some cases, the spintorque diode effect could also provide a step further to
> reach higher performances. As for parasitic limitations,
> research efforts on interfacial resistance are expected to
> play a positive role in improving the frequency behavior.

## [What If Your Fitbit Could Run on a Wi-Fi Signal?](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3879/What%2BIf%2BYour%2BFitbit%2BCould%2BRun%2Bon%2Ba%2BWi-Fi%2BSignal_%2B-%2BScientific%2BAmerican.pdf)

MIT-based research

- [The Limits Of Energy Harvesting](https://semiengineering.com/the-limits-of-energy-harvesting/)
> Why the promise of unlimited power in end devices has achieved only spotty success.

[Batteryless energy harvester](http://energy.mit.edu/news/batteryless-energy-harvester/)
**Running electronics on body heat**

- [Can Electronic Devices Harvest Energy on Their Own?](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/3878/Can%2BElectronic%2BDevices%2BHarvest%2BEnergy%2Bon%2BTheir%2BOwn_%2B-%2BMIT%2BTechnology%2BReview.pdf)
Clever approaches to gathering ambient energy could lead to new applications.