Spray-on Nanoparticle Mix Turns Trees Into Antennas

The spray-on antennas also extend the range of existing antennas by 100x

2 min read

A small company called ChamTech Operations based in Utah has developed a nanoparticle mix that can be sprayed on any vertical object—like a tree—and make that object act as a high-powered antenna.

Not only can the sprayed-on nanoparticles make trees into antennas, but it can also extend the range of an existing antenna by a factor of 100, according to one of the principals of the company, Anthony Sutera. For instance, in RFID tags the nanoparticle spray extended the readable range of the tag from a mere five feet (1.5 meters) to 700 feet (200 m).

The material that Chamtech came up with contains nanoparticles that when sprayed on a surface act as nanocapacitors. The nanocapacitors charge and discharge very quickly and don’t create any heat that can reduce the efficiency of your typical copper antenna. The trick was to get the nanocapacitors to spread out in just the right pattern.

While watching the unassuming Sutera deliver his presentation (see below), I have to confess to being a bit incredulous.

But from the little I could find out about the technology, it seems to be what Sutera claims. A patent was issued last month. However, as far as some of the capabilities for the spray-on antenna, I haven’t been able to confirm them.

Nonetheless it’s not without precedent for nanoparticles to improve antenna range. Last year researchers at the University of Illinois used nanoparticles to create a 3-D antenna for cellphones. In that case, the 3-D antennas that the research team developed were an order of magnitude better—using such performance metrics as gain, efficiency, bandwidth, and range—than the typical monopole designs.

This product seems to take it all to another level. Perhaps most intriguing from an everyday electronics user perspective is that they sprayed the nanoparticles onto an iPhone antenna and put it into a Faraday cage. When they compared the dBm from the standard antenna to the one they sprayed, they measured an increase of 20 dBm from the standard antenna.

Another intriguing application, Sutera suggests in the video, is using the spray-on material in the white lines of the highway. This could make it possible to have high bandwidth connectivity in your car.

In the meantime, it appears that the technology was originally intended for military applications. According to the video, the military was suitably impressed.

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3D-Stacked CMOS Takes Moore’s Law to New Heights

When transistors can’t get any smaller, the only direction is up

10 min read
An image of stacked squares with yellow flat bars through them.
Emily Cooper

Perhaps the most far-reaching technological achievement over the last 50 years has been the steady march toward ever smaller transistors, fitting them more tightly together, and reducing their power consumption. And yet, ever since the two of us started our careers at Intel more than 20 years ago, we’ve been hearing the alarms that the descent into the infinitesimal was about to end. Yet year after year, brilliant new innovations continue to propel the semiconductor industry further.

Along this journey, we engineers had to change the transistor’s architecture as we continued to scale down area and power consumption while boosting performance. The “planar” transistor designs that took us through the last half of the 20th century gave way to 3D fin-shaped devices by the first half of the 2010s. Now, these too have an end date in sight, with a new gate-all-around (GAA) structure rolling into production soon. But we have to look even further ahead because our ability to scale down even this new transistor architecture, which we call RibbonFET, has its limits.

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