If we ever charge the phone from Wi-Fi signals?

Date:

2019-02-13 22:30:15

Views:

2828

Rating:

1Like 0Dislike

Share:

If we ever charge the phone from Wi-Fi signals? Source:

Our eyes are tuned only to a narrow band of possible wavelengths of electromagnetic radiation, about 390-700 nanometers. If you would like to see the world on different wavelengths, you would know that in an urban area you illuminated even in the dark — everywhere infrared radiation, microwaves and radio waves. Part of this electromagnetic radiation to the environment is emitted by objects that scatter everywhere their electrons, and part transfers radio signals and signals that are the basis of our communication systems. All this radiation also carries energy.

the

What if we could harness the energy of electromagnetic waves?

Researchers from Massachusetts Institute of technology presented a study that appeared in the journal Nature, where it is described as embarked on the practical implementation of this goal. They developed the first fully flexible device that can convert energy from Wi-Fi signals into usable direct current electricity.

Any device that can convert AC signals (AC) to direct current (DC), called rectennas: rectifying antenna (rectifying antenna). The antenna picks up electromagnetic radiation, transforming it into alternating current. It then passes through the diode, which converts it to direct current for use in electrical circuits.

For the First time rectenna was proposed in the 1960-ies and even used to demonstrate a model helicopter powered by microwaves, 1964 inventor William brown. At this stage, futurists have dreamed of wireless power transmission over long distances and even use recten to collect solar energy on satellites and transmission to Earth.

the

Optical rectenna

Today the new technologies at the nanoscale enables many new things. In 2015 researchers from the Georgia Institute of Technology collected the first optical rectenna, able to cope with high frequencies in the visible spectrum from carbon nanotubes.

While these new optical rectenna have have a low efficiency, about 0.1%, and therefore can not compete with the growing efficiency of photovoltaic solar panels. But the theoretical limit for solar cells based on rectan probably higher than the limit Shockley-Kusser for solar cells, and can reach 100% when illuminated by radiation of a certain frequency. This enables efficient wireless energy transfer.

The New part of the device MIT, takes advantage of the flexible radio frequency antenna which can capture wavelengths associated with the Wi-Fi signals and convert them to alternating current. Then, instead of the traditional diode to convert this to DC, the new device uses "two-dimensional" semiconductor thickness of only a few atoms, creating a voltage that can be used to power wearable devices, sensors, medical devices or electronics large area.

New rectenna consist of such "two-dimensional" (2D) materials — molybdenum disulfide (MoS2), which is only three atoms thick. One of its remarkable properties is the reduction of parasitic capacitance — the tendency of materials in electrical circuits to act as capacitors that hold a certain amount of charge. In electronics, the DC's may limit the speed of signal converters and the ability of devices to respond to high frequency. New rectenna of molybdenum disulfide have a parasitic capacitance an order of magnitude below those that have been developed to date that allows the device to capture signals up to 10 GHz, including in the range of a typical Wi-Fi devices.

Such a system would be less problems associated with batteries: its life cycle would be much longer the electrical device is charged from ambient radiation would not be necessary to dispose of components, as in the case with batteries.

"What if we could develop electronic systems that wrap around the bridge or which will cover the whole trunk, the walls of our office, and provide electronic intelligence to everything that surrounds us? How will you provide energy for all this electronics?", asks co-author Tomas Palacios, a Professor of electrical engineering and computer science at the Massachusetts Institute of technology. "We invented a new way to power electronic systems of the future."

Using 2D materials allows you to cheaply produce a flexible electronics that will potentially allow us to place it on a large area for collection of radiation. Flexible devices could equip a Museum or a road surface, and it would be much cheaper than using rectenna of traditional silicon semiconductors or gallium arsenide.

the

is it Possible to charge the phone from Wi-Fi signals?

Unfortunately, this option seems highly unlikely, although for many years the topic of "free energy" fooling people again and again. The problem is the energy density of signals. The maximum power that can be used by the access point Wi-Fi without a special license for broadcasting, typically 100 milliwatts (mW). These 100 mW radiated in all directions, spreading over a surface area of a sphere the center of which is the access point.

Even if your mobile phone has gathered all this power with 100%efficiency to charge the iPhone battery still would need days, and a small area of the phone and its distance from the access point will severely limit the amount of energy that he could gather from these signals. New device from MIT can capture about 40 milliwatts of energy when exposed to a typical density Wi-Fi at 150 milliwatts: this is not enough to power the iPhone, but for simple display or remote wireless sensor.

For this reason, much more likely that wireless charging for larger gadgets will rely on an induction charging device, which can power the device at a distance of one meter, if between the wireless charger and charging facility nothing.

However, the ambient RF energy can be used to power certain types of devices, you think, was a Soviet radios? And the coming "Internet of things" definitely will use these models supply. It remains only to create sensors with low power consumption.

Co-author with jesús Grajal from the Technical University of Madrid, sees a potential application in implantable medical devices: a pill that the patient can swallow, give health information back to the computer for diagnostics. "Ideally I would not want to use a battery to power such systems, because if they miss lithium, the patient could die," says Grahl. "It is much better to collect energy from the environment to nourish these little laboratories inside the body and transmit data to external computers."

The Current efficiency of the device is about 30-40% compared to 50-60% for traditional rectan. Along with concepts such as piezoelectricity (the materials that generate electricity by physical compression or stretching), electricity generated by the bacteria and heat to the environment, "wireless" electricity could become one of the power sources for microelectronics of the future.

I Hope you don't mind the fact that this method of charging for phone not suitable? Tell us .

Recommended

Can genes create the perfect diet for you?

Can genes create the perfect diet for you?

Diet on genotype can be a way out for many, but it still has a lot of questions Don't know what to do to lose weight? DNA tests promise to help you with this. They will be able to develop the most individual diet, because for this they will use the m...

How many extraterrestrial civilizations can exist nearby?

How many extraterrestrial civilizations can exist nearby?

If aliens exist, why don't we "hear" them? In the 12th episode of Cosmos, which aired on December 14, 1980, co-author and host Carl Sagan introduced viewers to the same equation of astronomer Frank Drake. Using it, he calculated the potential number ...

Why does the most poisonous plant in the world cause severe pain?

Why does the most poisonous plant in the world cause severe pain?

The pain caused to humans by the Gimpi-gympie plant can drive him crazy Many people consider Australia a very dangerous place full of poisonous creatures. And this is a perfectly correct idea, because this continent literally wants to kill everyone w...

Comments (0)

This article has no comment, be the first!

Add comment

Related News

Called the second reason for the existence of liquid water on Mars

Called the second reason for the existence of liquid water on Mars

in the Summer of 2018, the researchers found signs of the presence under the ice caps of the South pole of Mars. According to radar equipment of the Mars Express, the lake is at a depth of 1.5 km, and extends for over 20 km. Initi...

Trump has set a goal to make America first in the field of artificial intelligence

Trump has set a goal to make America first in the field of artificial intelligence

Artificial intelligence could be invented in the United States, but other countries, including Canada and France took major steps to support the development of this technology and benefit from it. And so Donald trump, the US Presi...

Under the ice of Greenland found a huge crater: how many?

Under the ice of Greenland found a huge crater: how many?

In November 2018 under the Greenland glacier Hiawatha were found with a diameter of about 31 kilometers. Geologists were very surprised to find, as they already tend to think that thick layer of ice fully aligns like depression. T...

Multicellular organisms appeared much earlier than expected

Multicellular organisms appeared much earlier than expected

Until now it was thought that most of the time was inhabited by a stationary single-celled organisms and multicellular creatures appeared on it only 600-650 million years ago. A new discovery scientists have completely disproved t...

Earth may be completely deprived of insects for the next hundred years

Earth may be completely deprived of insects for the next hundred years

the Fauna of insects is shrinking so fast that it can completely disappear in the next century, the report says scientists from Sydney and Quislings universities and the Chinese Academy of agricultural Sciences in Beijing. Having ...

Ionalit the size of a coin flies without wings, propellers and moving parts

Ionalit the size of a coin flies without wings, propellers and moving parts

Flying robots the size of insects are usually designed to mimic biological insects, because the biological insects are considered as masters of efficient small flight. These microapparatus flying with flapping wings (FMAV) are app...

As electromagnetic waves from lightning affect living cells?

As electromagnetic waves from lightning affect living cells?

At any point in time, in different parts of the world, thundering about 2000 thunderstorms. from the constant lightning strikes resonates in the zone between the earth's surface and the ionosphere, which is why there is such a thi...

Scientists weaned mosquitoes drink blood and spread disease

Scientists weaned mosquitoes drink blood and spread disease

Some mosquito species are actively spreading a huge number of deadly diseases, which includes yellow fever and zika virus. They are transferred between organisms while drinking the blood, so the scientists decided to come up with ...

Experiment: find out whether the fish themselves in the mirror?

Experiment: find out whether the fish themselves in the mirror?

This is very strange to realize, but the ability to recognize her own face in the mirror — this is a very rare skill in the animal world. People are able to learn yourself approximately 15 months of age — it is also capable of som...

Scientists have identified

Scientists have identified "neurological patterns" of consciousness

a New study using functional magnetic resonance imaging (fMRI) shows that the picture of the brain of a person in a vegetative state or minimal consciousness state different from the pattern of activity of the human brain, in cons...

The last four years have been the hottest in modern history

The last four years have been the hottest in modern history

that global warming can cause , has long been known. Unfortunately, many people do not realize the seriousness of the problem, as climate changes occur so slowly that without a comparison of the temperature indicators of various y...

The laser was able to juggle drops

The laser was able to juggle drops

Suspended by means of a laser beam micrometer glycerin drops begin to move in orbits, which in form resemble the trajectory of the balls of the juggler. By this unexpected discovery physics came from Germany and Sweden, which are ...

Mice were able to restore amputated fingers by using two protein

Mice were able to restore amputated fingers by using two protein

Perhaps in the future people will be able to restore lost limbs — in any case, suggesting medical experiments. Scientists already know that under certain conditions, the body can grow bone, but they still failed to fix the signs o...

By the end of the 21st century most of the oceans will change color

By the end of the 21st century most of the oceans will change color

climate Change causes significant changes in the state of phytoplankton in the World ocean, and a new study has shown that in coming decades these changes will greatly affect the color of the ocean, enhancing its blue and green re...

In Africa, found traces of ancient glaciers

In Africa, found traces of ancient glaciers

Can you believe that once upon a time, in the lands of Africa were passing huge glaciers? If you consider that throughout the long history of the continents changed their location, this may be. Geologists already have strong evide...

Proven: bacteria sacrifice themselves to protect the colony from antibiotics

Proven: bacteria sacrifice themselves to protect the colony from antibiotics

Despite its tiny size, bacteria are incredibly tricky. To protect themselves and their colony from the effects of antibiotics, can they evade danger by being in hibernation, or to develop a genetic resistance to the drugs. Researc...

Proved that the female brain remains young longer than men

Proved that the female brain remains young longer than men

that between male and female brains, there are structural differences, scientists have known for a long time. So, in 2017, researchers from the Amen Clinics have studied 20 000 photos of the brain and found that the female brain i...

Three projects of geoengineering that can fix or break the Earth

Three projects of geoengineering that can fix or break the Earth

From the growing forest area of the continent to call for rain, scientists began to propose, test and even implement large-scale geo-engineering projects to radically transform the planet. These projects are designed to solve prob...

Found a part of the brain that makes people laugh and feel euphoric

Found a part of the brain that makes people laugh and feel euphoric

a Surgical operation on the brain is an extremely complex process, during which patients sometimes it's important to keep in mind. It is necessary that the surgeon at any time to speak with the person and make sure that its lingui...

Our galaxy was not the flat disc, as previously thought

Our galaxy was not the flat disc, as previously thought

the results of the study by an international team of astronomers, Astronomy journal Nature, suggests that our home galaxy the milky Way is not like a flat "pancake", as was previously assumed. Closer to the edges of the galaxy bec...