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Antenna

A 12-hour observation of an ASKAP test field (Image: Ian Heywood and the ACES team/CSIRO)

In preparation for the Square Kilometer Array (SKA) radio telescope project set to start construction in 2018, the CSIRO’s recently unveiled Australia SKA Pathfinder (ASKAP) radio telescope array has been used to demonstrate and prove the technology involved. With the images it has captured so far, it has also shown its ability to operate as a fully-fledged radio telescope in its own right.  Read More

The technology could allow antennas to fit seamlessly into the skins of aircraft and other...

Anyone who’s ever needed a pair of thick eyeglasses has a firm idea that lenses are the one thing where form follows function. However, BAE Systems and Queen Mary’s School of Electronic Engineering and Computer Science in London have put paid to that idea with a flat lens that works like a conventional curved lens, yet without any reduction in bandwidth performance. Using a combination of composite metamaterials and transformational optics for the first time, they have created a lens that's able to bend electromagnetic waves, yet isn't bound by its shape for its function.  Read More

DARPA plans to re-purpose RQ-7 Shadow UAVs to provide even the most remote US forces with ...

The Defence Advance Research Projects Agency (DARPA) plans to extend connectivity for forward military units with the use of small Wi-Fi-hosting drones. The aim of the Mobile Hotspots project is to provide a reliable, mobile source of bandwidth to all echelons of the military on a scale unthinkable using current methods.  Read More

ESA's 15 m-diameter dish antenna at the European Space Astronomy Centre (ESAC), near Madri...

As you might expect, acquiring a signal from a satellite traveling at speeds of over 17,400 mph can be a tricky business. A new system called SARAS, which is a Spanish acronym for "Fast Acquisition of Satellites and Launchers," more than doubles the effective area of the receiving dish antenna, allowing the signal to be acquired much faster.  Read More

One of the Mylar test antennas

CubeSats are certainly in the process of revolutionizing the satellite industry. They can serve many of the same functions as full-sized satellites, but at a size of 10 x 10 x 10 cm (3.9 x 3.9 x 3.9 in) and a mass of under 1.33 kg (2.9 lb), they’re much cheaper to build and get into orbit. With that smaller overall size, however, comes smaller onboard antennas. These severely limit CubeSats’ communications range, restricting them to fairly low orbits. That may be about to change, though, as MIT is developing larger, inflatable antennas.  Read More

HAARP operational site on the edge of Denali State Park northeast of Anchorage, Alaska (Ph...

Reports that the High Frequency Active Auroral Research Program (HAARP) had been shut down permanently were apparently a bit premature. According to HAARP program manager James Keeney, the facility is only temporarily off the air while operating contractors are changed. So why does anyone care? Despite being associated with various natural disasters over the past two decades by the conspiracy fringe, HAARP is in reality a facility for studying the ionosphere. Let's take a look at the goings on at HAARP – past, present, and future.  Read More

A new Wi-Fi-based 'Wi-Vi' system can track people moving behind walls (Image: Christine Da...

Researchers at MIT's Computer Science and Artificial Intelligence Laboratory have developed what could become low-cost, X-ray vision. The system, known as "Wi-Vi," is based on a concept similar to radar and sonar imaging, but rather than using high-power signals, this tech uses reflected Wi-Fi signals to track the movement of people behind walls and closed doors.  Read More

The rectenna label utilizes NFC technology to transmit data, using power harvested from th...

By now, we’ve all become quite used to seeing QR codes on products, price tags and advertisements – just scan the code with your smartphone’s camera, and it’s converted into readable information. Soon, however, those codes could be facing competition from something known as the rectenna. It’s an inexpensive label-like device that transmits data to a near-field communication (NFC)-enabled smartphone, using that phone’s radio waves as its power source.  Read More

Researchers at the military technology firm Chamtech have developed a special aerosol spra...

Soon, you may be able to correct your cell phone's signal problems by spraying on an antenna. Researchers at the military technology firm Chamtech have developed a special aerosol spray that can essentially add an antenna to whatever it's sprayed on and improve the network coverage in the area. The spray essentially covers a surface with thousands of nanocapacitors. Those nanocapacitors align themselves on the surface, and create a wireless antenna for the devices located in the area. The idea is essentially the nanocapactitors take care of all of the hard work involved in finding a wireless signal, making it easier for your phone or tablet to get connected and stay connected to a network.  Read More

Onur Hamza Karabey and his prototype liquid crystal antenna

Vehicles such as cars, ships and aircraft need to stay in stable contact with earth-orbiting satellites, in order for on-board functions like GPS, internet access and satellite television reception to work properly. As the vehicles move, their orientation to those satellites changes, so electronically-redirectable phased-array antennas are typically required. According to scientists at Germany's Technische Universität Darmstadt, however, these are "either very expensive or only sluggishly redirectable." That's why doctoral candidate Onur Hamza Karabey is working on a low-cost, fast-performing alternative - a liquid crystal antenna.  Read More

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