antenna

Antenna

Amplifier (40)
Antenna (270)
Circuits (1435)
Consumer electronics (474)
Electrode (1090)
Electronic converters (51)
Electronic device (277)
Electronic equipment (61)
Logic gate (59)
Microchip (210)
Multiplexer (10)
Receiver (136)
Sensor (3035)
Transceiver (19)
Transmitter (109)

That led to a prototype cigar-sized antenna that connects phones via public unlicensed airwaves.

The antennas are sold in pairs for $149. 99 with no additional service charges. The antennas make up the network

and the service operates independently from cellular or Wi-fi networks. The signal range is anywhere from 50 miles to several blocks depending on interference.``

A thin, circular antenna spans the perimeter of the deviceoughly tracing a person irisnd harnesses enough energy from the surrounding field to power a small pressure sensor chip.

The problem LÃNARD says is that terahertz radiation typically requires an antenna to achieve coupling into a single nanotube due to the relatively large size of terahertz waves.

and graduate student Xiaowei He does not require an antenna and is thus amenable to simple fabrication.

#Ant-size radios could help create Internet of things A new radio the size of an ant can gather all the power it needs from the same electromagnetic waves that carry signals to its receiving antenna no batteries required.

The antenna had to be small one-tenth the size of a Wi-fi antenna and operate at the incredibly fast rate of 24 billion cycles per second.

a receiving antenna that also scavenges energy from incoming electromagnetic waves; a transmitting antenna to broadcast replies

and relay signals over short distances; and a central processor to interpret and execute instructions. No external components or power are needed.

and collect the resulting signal with a powerful parabolic antenna so that the signal could then be analyzed

The researchers instead developed an ultra-low power tag prototype with an antenna and circuitry that can talk to Wi-fi-enabled laptops or smartphones while consuming negligible power.

and freezing rain from forming directly on antennas. But the domes themselves must also be kept clear of ice that could damage them

Each antenna has its own hase delayow much light is slowed as it passes through the structure.

and can be achieved by altering the V-shaped antennas. The US Air force Office of Scientific research Army Research Office and the National Science Foundation partially funded the research.

and tested a new approach to cloakingâ##by surrounding an object with small antennas that collectively radiate an electromagnetic field.

Eleftheriades and Phd student Michael Selvanyagam s system wraps the mailbox in a layer of tiny antennas that radiate a field away from the box cancelling out any waves that would bounce back.

instead of surrounding what you re trying to cloak with a thick metamaterial shell we surround it with one layer of tiny antennas

and this layer radiates back a field that cancels the reflections from the object. heir experimental demonstration effectively cloaked a metal cylinder from radio waves using one layer of loop antennas.

Currently the antenna loops must be attuned manually to the electromagnetic frequency they need to cancel

and active antennas adjusting to different waves in real time much like the technology behind noise-canceling headphones Work on developing a functional invisibility cloak began around 2006

or light waves could use the same principle as the necessary antenna technology matures. here are more applications for radio than for lightsays Eleftheriades. t s just a matter of technologyâ##you can use the same principle for light

#New giant clam species hid in plain sight One type of giant clam turns out to be two separate species report researchers who discovered the new species on reefs in the Solomon islands and at Ningaloo

Another application could be to improve the energy efficiency of appliances by wirelessly recovering power that is now lost during use. he properties of metamaterials allow for design flexibility not possible with ordinary devices like antennassays Katko. hen traditional antennas are close to each other in space they talk to each other

The antenna is typical of circuitry in devices associated with covert communications espionage or explosives.

#Tunable antenna could end annoying dropped calls Cornell University rightoriginal Studyposted by Anne Ju-Cornell on October 22 2013.

Like a radio tuned to different stations cell phone antennas have tuning circuits that quickly switch frequencies

so you don t need any additional material to make these antennas#Cubukcu says.##We take the same exact platform

and by patterning it with these nanoscale antennas the conversion efficiency of the detector improves 10 times.#

#Our antennas can be engineered to absorb at any wavelength.##While only a proof-of-concept at this stage future research will demonstrate the device s capabilities as a low-cost way of analyzing individual proteins and gas molecules.

and football-field sized antennas.####For#space-based solar power (SBSP), there would be two basic steps,

The microwave transmission that would deliver SBSP s electricity from an orbiting antenna to terrestrial rectennas would be##2 million times the power of that produced by the microwave oven.##

Its included suction cup mount has an##energy antenna##embedded inside to gather electromagnetic activity (such as from#Wi-fi signals) to translate for use as power,

The tag s antenna encodes data#by selectively reflecting or absorbing the signals. This selective reflection makes tiny changes in signal strength that can be detected

The island itself will be glistening from the massive net studded with billions of tiny rectifying antennas designed to convert microwave energy into DC power Next to the antennas is a large substation that sends vast amounts of power through an underwater cable to Tokyo,

The first one involves a huge square panel (measuring over 1 mile per side) that is covered with photovoltaic receptors on the top and transmission antennas on the bottom.

with the cylindrical conducting tube lining the machine functioning as a waveguide for a signal transmitted by an outside antenna.

Antenna weight can be brought down by using antennas that unfurl themselves in space, like those being developed by Sergio Pellegrino at the California Institute of technology.

This means antennas of similar size to today's can be made of lighter materials as they will only have to support their own weight in microgravity, rather than On earth's surface.

The primary culprit in smartphone battery drain is an inefficient power amplifier a component that is designed to push the radio signal out through the phones antennas.

In the robot s watertight chamber are its control circuitry its battery a communications antenna and an inertial measurement unit

For example, many radar antennas are housed in spherical domes, which can collapse catastrophically in very high winds.

In the latest issue of IEEE Transactions on Antennas and Propagation researchers in MIT s Research Laboratory for Electronics describe a new technique that could reduce the number of sensors required for terahertz

In the recent past a team of Princeton professors including Mcalpine created a bionic ear out of living cells with an embedded antenna that could receive radio signals.

or biological cells or to create antennas or photonic components. For this work we focused on creating nanostructures using photosensitive polymers

#Researchers create unique graphene nanopores with optical antennas for DNA sequencing High-speed reading of the genetic code should get a boost with the creation of the world's first graphene nanopores pores measuring approximately 2 nanometers in diameter that feature a"built-in

"optical antenna. Researchers with Berkeley Lab and the University of California (UC) Berkeley have invented a simple,

"With our integrated graphene nanopore with plasmonic optical antenna, we can obtain direct optical DNA sequence detection,

which a hot spot on a graphene membrane formed a nanopore with a self-integrated optical antenna.

and its optical antenna,"says Lee.""Simultaneously correlating this optical signal with the electrical signal from conventional nanopore sequencing provides an added dimension that would be an enormous advantage for high-throughput DNA readout."

"A key to the success of this effort is the single-step photothermal mechanism that enables the creation of graphene nanopores with self-aligned plasmonic optical antennas.

The dimensions of the nanopores and the optical characteristics of the plasmonic antenna are tunable, with the antenna functioning as both optical signal transducer and enhancer.

so that each base-pair fluoresces at a signature intensity as it passes through the junction of the nanopore and its optical antenna."

"In addition, either the gold nanoplasmonic optical antenna or the graphene can be functionalized to be responsive to different base-pair combinations,

"The gold plasmonic optical antenna can also be functionalized to enable the direct optical detection of RNA, proteins, protein-protein interactions, DNA-protein interactions,

"The results of this study were reported in Nano Letters in a paper titled"Graphene nanopore with a Self-Integrated Optical Antenna. e

In an international study University of Melbourne and the National Institute of Standards and Technology in the US found that pairs of closely spaced nano particles made of gold can act as optical antennas.

but can be used to coat glass and plastic as well as radar domes and antennas. In the previous process the nanoribbons were mixed with polyurethane

and hence, optical properties of select antennas. Therefore, one can decide after fabrication, rather than before,

amplifying the light radiation in hot spots regions of the antenna, explains Pietro Giuseppe Gucciardi, a physicist at the Institute for Chemical-Physical Processes, affiliated with the Italian National Research Council CNR, in Messina,

including flexible electronics such as antennas, chemical sensors and strain detectors.""It also would produce transparent electrodes for solar cells and organic light-emitting diodes,

"The terahertz multiplexing system developed by the researchers uses a"leaky wave antenna, "which has"two metal plates placed in parallel to form a waveguide,"according to information from the university."

"Frequency-Division Multiplexing in the Terahertz Range Using a Leaky-Wave Antenna,"in Nature Photonics on September 14.

SV Subba Rao said the phased array radar antenna is stationary while its beam generated by 4,

NASA Spiderfab project intends to 3d print the underlying structures for such objects as antennas and solar panels.

While an antenna could improve communication, an optimally designed, large-scale solar array could power spacecraft, robots, drones, and more.

NASA Spiderfab project intends to 3d print the underlying structures for such objects as antennas and solar panels.

While an antenna could improve communication, an optimally designed, large-scale solar array could power spacecraft, robots, drones, and more.

antenna-rectifier diodes that convert light into DC current, have been built using multiwall carbon nanotubes with integrated nanoscale rectifiers.

The carbon nanotubes in the devices function as antennas for capturing light. When the light waves strike the nanotube antennas,

an oscillating charge is created that travels through the rectifier devices. A small direct current (DC) is created

a device that combines the functions of an antenna and a rectifier diode to convert light directly into DC current.

The antennas had to be sufficiently small enough for coupling optical wavelengths and the rectifier diode had to have the ability to operate rapidly to capture electromagnetic wave oscillations.

which is sufficient for ejecting electrons out of the carbon nanotube antennas upon the absorption of visible light Light in the form of oscillating waves interacts with nanotubes after going through the calcium-aluminum electrode.

which is in a few attofarads. rectenna is basically an antenna coupled to a diode, but when you move into the optical spectrum,

that usually means a nanoscale antenna coupled to a metal-insulator-metal diode. The closer you can get the antenna to the diode

the more efficient it is. So the ideal structure uses the antenna as one of the metals in the diode

which is the structure we made-Prof Baratunde Cola, Georgia Tech The rectennas were grown on rigid substrates

Now, they have a prototype for a new and improved type of rover antenna one that could turn those minutes into hours,

The idea comes from a group working on advanced antenna technology at UCLA, in combination with NASA Jet propulsion laboratory.

The idea is basically to use an array of 256 antenna elements (a 16 x 16 square) all working together to make a uper-antennacapable of directly communicating with Earth.

The reason it works is not just that the array of mini-antennas creates a more powerful signal

and Mars. The additive characteristics of its compound antenna actually work in both directions; not only will it be able to create more powerful signals to transmit back to Earth,

and so the antenna is planned to be mounted on a gimbal arm that can lift the antenna and orient it in any direction.

This unrestrained antenna mount combined with the circular polarization of the signal itself, should also allow the rover to transmit

The device created here is a modification of a common type of antenna designed to operate at THZ wavelengths.

Termed a eaky wave antenna the device is made from two parallel metal plates, forming a waveguide.

compact rectangular box fitted with an antenna, a signal amplifier and a battery, which can be carried easily

he added say, by unfolding antennas. But the futuristic technology is still in its infancy,

A tiny flake of graphene on silicon carbide and a futuristic-looking antenna and there it is the new graphene detector.

We only needed a broadband antenna and the right substrate to create the ideal conditions,

the graphene flake and antenna assembly absorbs the rays, thereby transferring the energy of the photons to the electrons in the graphene.

Then there is also an antenna which acts like a funnel and captures long-wave infrared and terahertz radiation.

The external antenna on the detector captures long-wave infrared and terahertz radiation and funnels it to a graphene flake

A tiny flake of graphene on silicon carbide and a futuristic-looking antenna and there it is the new graphene detector.

We only needed a broadband antenna and the right substrate to create the ideal conditions,

the graphene flake and antenna assembly absorbs the rays, thereby transferring the energy of the photons to the electrons in the graphene.

Then there is also an antenna which acts like a funnel and captures long-wave infrared and terahertz radiation.

conformal electronics and antennas for maximizing space efficiency and reducing aerodynamic drag; and inherently more durable circuits that will withstand the extreme strain, shock,

and strains and report this information through miniature embedded antennas to ground crews or a pilot.

wearable patch and would include an antenna to transmit these biometric signals to the pilot or a ground team.

classical dipole patch antennas have been used.""Now, our technology introduces'metasurfaces'that are much better energy collectors than classical antennas,

"explained Omar M. Ramahi, professor of electrical and computer engineering. Metasurfaces are formed by etching the surface of a material with an elegant pattern of periodic shapes.

"Conventional antennas can channel electromagnetic energy to a load --but at much lower energy absorption efficiency levels,"said Ramahi."

"Our research enables significantly higher energy absorption than classical antennas, "Ramahi said.""This results in a significant reduction of the energy harvesting surface footprint.

#A stretchable far-field communication antenna far wearable electronics The age of wearable electronics is upon us as witnessed by the fast growing array of smart watches, fitness bands and other advanced,

the antenna for far-field communication, is still a challenge,"Muhammad Mustafa Hussain, an Associate professor of Electrical engineering at KAUST, tells Nanowerk.

To complement existing designs for stretchable antenna systems which usually radiate at different resonant frequencies

or the exotic materials used an international team led by Hussain now demonstrates a stretchable and wearable antenna that can provide a single frequency operation

("Metal/Polymer Based Stretchable Antenna for Constant Frequency Far-Field Communication in Wearable Electronics"."The paper will be the front cover article of the print edition.

The team's flexible and stretchable metal thin-film (copper) antenna for far-field communication up to 80 meters

"We fabricated our antenna using a metal/polymer bilayer process the resulting structure combines the conductivity of the metal

"The key reason the antenna needed to be fabricated as a metal/polymer bilayer is that standalone metal thin films are very malleable,

"That means that a metal thin film lateral spring structure cannot be used as a stretchable antenna,

As a result, the key performance parameters of the antenna do not change with bending,

stretching, flexing and twisting hence the antenna can continuously communicate information in the Wifi frequency band

the researchers found that their antenna retains all its essential properties such as gain, radiation pattern, directionality, operation frequency and bandwidth for up to 30%strain and for 2000 stretching cycles.

As a next step, the team will integrate their stretchable antenna into a fully integrated, flexible, stretchable and wearable sensor array for real-time communication of sensor information s

plus different antenna systems coming out of his backpack. So we talked about it, and if he had a heads-up display,

and initiatives-it can be reached through low-power radios, small antennas, and computer laptops if you have the technical know-how.

#New understanding of electromagnetism could enable'antennas on a chip'A team of researchers from the University of Cambridge have unravelled one of the mysteries of electromagnetism,

which could enable the design of antennas small enough to be integrated into an electronic chip.

These ultra-small antennas--the so-called'last frontier'of semiconductor design--would be a massive leap forward for wireless communications.

The purpose of any antenna, whether in a communications tower or a mobile phone, is to launch energy into free space in the form of electromagnetic or radio waves,

however, is that antennas are still quite big and incompatible with electronic circuits --which are ultra-small

"Antennas, or aerials, are one of the limiting factors when trying to make smaller and smaller systems,

dielectric resonators are used already as antennas in mobile phones, for example.""In dielectric aerials, the medium has high permittivity,

"Working with researchers from the National Physical Laboratory and Cambridge-based dielectric antenna company Antenova Ltd, the Cambridge team used thin films of piezoelectric materials, a type of insulator

and this new discovery opens up new ways of integrating antennas on a chip along with other components."

For instance, invisible rods could be used as supports for a miniature antenna complex connecting two optical chips.

but the survey-grade antennas these systems employ are too large and costly for use in mobile devices.

The breakthrough by Humphreys and his team is a powerful and sensitive software-defined GPS RECEIVER that can extract centimeter accuracies from the inexpensive antennas found in mobile devices--such precise measurements were not previously possible.

The researchers anticipate that their software's ability to leverage low-cost antennas will reduce the overall cost of centimeter accuracy,

to extract so-called carrier phase measurements from low-cost antennas. GRID currently operates outside the phone,

For the first time, the researchers were able to show that this mechanical system can be used to coherently manipulate an electron spin embedded in the resonator--without external antennas or complex microelectronic structures.

what's known as a leaky wave antenna. In this case the antenna is made from two metal plates placed in parallel to form a waveguide.

One of the plates has a small slit in it. As terahertz waves travel down the waveguide, some of the radiation leaks out of the slit.

which combines an antenna's function of receiving electromagnetic waves with a rectifier's function of outputting direct current.

The researchers also used computer modeling to design a bowtie-shaped antenna that would effectively capture the enhanced thermal emission.

Simulations predict that an antenna placed near the holey surface could capture 10,000 to 100,000 times more thermal energy than an antenna in open space.

there are antennas that receive signals. This function is assumed by the plexin B2 receptor, which receives a location signal from neighbouring cells,

meaning the antenna, says Worzfeld. In both cases, the damaged kidney was unable to regenerate,

The multiplexer that Mittleman and his colleagues have been working on makes use of what known as a leaky wave antenna.

In this case, the antenna is made from two metal plates placed in parallel to form a waveguide.

#First Optical Rectenna Combined Rectifier and Antenna Converts Light to DC Current Using nanometer scale components,

a device that combines the functions of an antenna and a rectifier diode to convert light directly into DC current.

the carbon nanotubes act as antennas to capture light from the sun or other sources. As the waves of light hit the nanotube antennas,

they create an oscillating charge that moves through rectifier devices attached to them. The rectifiers switch on

making the antennas small enough to couple optical wavelengths, and fabricating a matching rectifier diode small enough and able to operate fast enough to capture the electromagnetic wave oscillations.

enough to drive electrons out of the carbon nanotube antennas when they are excited by light. In operation, oscillating waves of light pass through the transparent calcium-aluminum electrode

allowing electrons generated by the antenna to flow one way into the top electrode. Ultra-low capacitance, on the order of a few attofarads, enables the 10-nanometer diameter diode to operate at these exceptional frequencies. rectenna is basically an antenna coupled to a diode

but when you move into the optical spectrum, that usually means a nanoscale antenna coupled to a metal-insulator-metal diode,

Cola explained. he closer you can get the antenna to the diode, the more efficient it is.

which is the structure we made. The rectennas fabricated by Cola group are grown on rigid substrates,

The service will become available by attaching a special antenna to the roof of a user building.

designed to hold a camera, LED light, an integrated circuit for receiving control instructions and transmitting data, antenna, 1. 5v button battery and, at the rear, the drive unit, to

Additional observations made using the Very Long Baseline Array--an interferometer consisting of 10 identical antennas distributed across the United states

The technology involves beaming radio waves through this simple antenna-and-rubber sandwich. When the device comes under pressure the copper antennas squeeze the rubber insulator and move infinitesimally closer together.

That tiny change in proximity alters the electrical characteristics of the device. Radio waves passing through the two antennas slow down in terms of frequency.

When pressure is relaxed the copper antennas move apart and the radio waves accelerate in frequency.

The engineers proved that this effect was measurable giving them a way to gauge the pressure exerted on the device by tracking the frequency of radio waves passing through the device.

By putting this pyramid-shaped rubber layer between the copper antennas this team of engineers was able to exploit the subtle interactions of radio waves

but can be used to coat glass and plastic as well as radar domes and antennas. This scanning electron microscope image shows a closeup of the nanoribbon network in Rice university's high-density graphene nanoribbon film.

#A Tunable Liquid Metal Antennas for Tuning in to Anything Tuning in is getting to be complicated a thing.

All those need antennas of different lengths and shapes to accommodate the sometimes widely spread wavelength bands.

Monopole antennas, consisting of a single conducting rod, transmit maximum power when their length corresponds to half the wavelength of the RF signal,

"The present solution is to have a switchable filter bank along with switchable and/or multi-band antenna, ays Jacob Adams,

a liquid metal antenna that can continuously adapt to different wavelengths by changing its length inside a capillary.

Such antennas have been developed in the past but with little success because they rely on pneumatic pumps for controlling the length in the capillary,

For centimeter-wavelengths, liquid metal antennas would remain separate elements in the circuitry, but for millimeter waves they could be integrated on microfluidic chips,

says Adams. However even larger liquid metal antennas could be useful in defense communications and radar systems that use bands ranging from a few megahertz to tens of gigahertz,

they could potentially cut down on the'antenna farms'found on large defense platforms, such as on ships and planes,"says Adams

For instance, it could shield antennas in cell towers from each other, lowering crosstalk. Or it could make better solar concentrators,

for example, one of the new prototypes switches its antenna back and forth between modes that absorb and reflect the signal from a nearby Wi-fi router.

capture free over-the-air TV broadcasts on tiny antennas in data centersne antenna per customernd send that content over the Internet to individual subscribers,

Energous charging method uses a transmitter with lots of small antennas to send radio waves to a receiver connected to the gadget being charged.

#Applied Nanotech Tests Ballistic, Blast-Resistant Armor Panels with Printed Electronic Antennas Applied Nanotech, Inc. ANI), a PEN Inc. company (PEN), announces successful completion

and test of fiberglass ballistic and blast-resistant armor panels that incorporate printed electronic antennas capable of sending

The multi-function armor eliminates the need for multiple high-profile communications antenna structures on military vehicles

The armor-incased antennas also have jamming capability to block radio signals such as those used to remotely trigger explosives,

Two wideband low-profile antennas have been developed, each capable of carrying signals at multiple frequencies. Together they provide electronic warfare, jamming and communication capabilities.

combines the knowledge and experience of printed electronics of ANI with the antenna design and modeling capabilities of UT Knoxville and Villanova,

and create a complex antenna structure that not only provides ballistic protection but also may help defeat improvised explosive devices

modeling and testing,"says Dr. Ahmad Hoorfar, Professor and Director of Antenna Research Laboratory, Department of Electrical and Computer engineering, Villanova University y