The nano photonic crystal antennas for mobile phones existed for several years

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Nov 6, 2007, 4:06:43 AM11/6/07
By electronic translator.


The antennas nano photonic crystal for mobile phones existed
for several years.
They have no lobes radiation (EMF) and communicate directly with the
mobile phone of the user.
Nobody is irradiated because the uplink and downlink in radio is the
size of a hair.
The only problem now is the cost which is about 15 to 20 times more
expensive than a antenna and the same for a mobile phone.
Only manufacturing can reduce the price.

CNRS : The National Center for Research Scientique is an agency of the
French state.

If you like we can translate English PDF document.



File :


Les antennes nanométriques à cristaux photoniques pour la téléphonie
mobile existent
depuis plusieurs années.

Elles n’ont pas de lobes d’irradiation et communiquent directement avec
le téléphone portable de l’utilisateur.

Personne n’est irradié parce que la liaison montante et descendante en
radiofréquences est de la grandeur d’un cheveu.

Le seul problème est actuellement le prix de revient qui est environ 15
à 20 fois plus cher qu’une antenne et pareil pour un téléphone mobile.
Seul la fabrication industrielle peut faire baisser le prix.

CNRS : Centre National de la Recherche Scientifique est un organisme de
l’état Français.

Si vous le souhaitez nous pouvons traduire en anglais le document PDF.




*De :* Andrew Michrowski
*Envoyé :* lundi 5 novembre 2007 23:36
***Objet :* Nanoradio 10,000 Times Thinner Than Human Hair (Listen)

You may find this development noteworthy and significant in social,
cultural and political contexts.

Andrew Michrowski


*Cal physicists make a radio 10,000 times thinner than a human hair*

Physicists at UC Berkeley say they have produced the world's smallest
radio out of a single carbon nanotube that is 10,000 times thinner than
a human hair.

Professor Alex Zettl led a team that developed the minuscule filament,
which can be tuned to receive AM or FM transmissions.

The first song it played? "Layla" by Derek & the Dominos. Eric Clapton's
unmistakable guitar riff can be heard on a scratchy recording of the
nanoradio's output posted by Zettl online.

<< Listen to the 'Layla' recording
Courtesy Zettl Research Group, Lawrence Berkeley National Laboratory and
University of California at Berkeley >>

Zettl said the device, built by graduate student Kenneth Jensen, is the
first radio within the size range of nanotechnology, which covers
inventions no larger than 100 billionths of a meter. The nanoradio is
100 billion times smaller than the first commercial radios of the early
20th century. It is a thousand times smaller than the most minute radios
in use today, which are based on silicon chip technology.

The research team has no commercial partners yet, but Zettl said the
practical applications of the nanoradio could include cell phones,
climate-monitoring systems and radio-controlled diagnostic probes that
could move through the human bloodstream.

"Maybe the kids will be wearing these instead of iPods, inside their
ears," Zettl said.

As long as 10 years ago, scientists had managed to build individual
components of a radio on the nanoscale, he said. But Zettl and his
colleagues figured out how to make a single nanotube perform all the
functions of a radio: It serves as an antenna, tuner, amplifier and
demodulator. The demodulator eliminates any frequencies from a radio
transmission except the signal to be played, such as a song.

"I hate to sound like I'm selling a Ginsu knife - 'But wait, there's
more! It also slices and dices!' - but this one nanotube does
everything," Zettl said.

The key to this feat was making the nanoradio work differently from
conventional radio electronics. The first step in that old technology is
to convert radio waves into pulses of electronic current. By contrast,
the nanotube absorbs the radio transmission and physically vibrates in
response, like a tuning fork or the tiny hairlike structures inside the
human ear. The filament has one end mounted in an electrode, but the
other end is free. Its vibrations change the patterns in an electric
field created by a battery. The varying electronic patterns become
sounds or music audible through headphones.

Jensen's choice for one of the first songs played on the nanoradio was
"Good Vibrations" by the Beach Boys.

But there is indeed more. The nanotube can also function as a
transmitter. Theoretically, thousands of nanoradios distributed through
the air or in the bloodstream could send back signals about air quality
or the state of a patient's cells, Zettl said.

Carbon nanotubes are immensely strong compounds made of carbon atoms
linked in a structure that looks like chicken wire. The carbon sheets
can be formed into hollow tubes. Zettl's research team tweaked the
nanotube structures and found that multi-walled cylinders - tubes within
tubes - were better for picking up AM and FM transmissions.
Single-walled nanotubes were best for receiving the frequencies used in
cell phones.

The team built a transmitter in the lab based on conventional
electronics, and first proved that the nanoradio could pick up and play
"Layla" about 10 months ago. But the scientists held the news for
publication in the journal Nano Letters, which posted it online on
Wednesday. Along with Jensen and Zettl, the co-authors of the paper were
UC Berkeley postdoctoral fellow Jeff Weldon and physics graduate student
Henry Garcia. The project was funded by the National Science Foundation
and the Department of Energy.

Hear a recording of the first song ever played on a nanotube radio at

/E-mail Bernadette Tansey at

This article appeared on page **C - 1** of the San Francisco Chronicle




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