joshua smith

joshua smith


intro’d to Joshua here:

The problem is that communicating via cellphone signals or Wi-Fi takes a lot of power, which means large batteries and thus, bulky, expensive devices.

But this chip in Seattle doesn’t need a radio. And it doesn’t even have a battery at all. It relies on two breakthroughs that could kick-start an Internet of Things sooner than anyone thought possible. “Electronics have got a trillion times more efficient in the last 50 years,” said Joshua Smith, the professor leading the effort to develop the technology. “But the radio signals in the air have been about the same.”

Smith has realized that the whispers of energy contained in everyday television broadcasts, even from many miles away, can be harvested using nothing more than an antenna and some clever electronics. But while this energy is enough to power the newest ultra-efficient sensors, it is still hundreds of times less than is needed for Wi-Fi communication — or traditional Wi-Fi communication, at least. Smith’s revolutionary innovation offers a way for tiny chips to send data to Wi-Fi devices like laptop computers and smartphones without broadcasting anything at all.


The tags could be designed to siphon energy from TV broadcasts, Wi-Fi signals, cellphone towers or a combination of all three.


googling… 2013: Wireless Power Transfer and RF Energy Harvesting: New Options for System Designers



on wanting to get rid of batteries all together.. so harvest from environment

cord elimination.. recharging.. large/heavy

from seattle.. don’t want to rely on sun

pre existing power, ie: tv’s, cell phones

41 min – on need to continue harvesting from smaller and smaller signals

find/follow Joshua:

link twitter

his site:

sensor systems lab site:


worked with Neil Gershenfeld..

energy ness

app chip ness