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Antenna

Space

NASA's Dawn spacecraft recovers after two malfunctions

NASA's Dawn spacecraft has recovered from an unexpected phenomenon that resulted in the robotic explorer going into safe mode on September 11, mirroring a similar event that affected the spacecraft three years ago as it approached the protoplanet Vesta. Dawn was launched in September 2007 atop a Delta II-Heavy rocket with a mission to explore Vesta and the dwarf planet Ceres. Read More

Electronics

Ant-sized radios could help connect trillions of devices to the Internet of Things

A team of researchers from Stanford University and the University of California, Berkeley, has created prototype radio-on-a-chip communications devices that are powered by ambient radio waves. Comprising receiving and transmitting antennas and a central processor, the completely self-contained ant-sized devices are very cheap to manufacture, don't require batteries to run and could give the "Internet of Things" (IoT) a serious kick start. Read More

Electronics

BAE Systems develops a flat lens that acts like it's curved

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

Space

New SARAS system speeds up satellite tracking

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

Space

How do you put a big antenna on a tiny satellite? Make it inflatable

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

Science

HAARP ionospheric research program set to continue

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

Science

Wi-Vi system uses Wi-Fi to see through walls

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

Mobile Technology

One-cent rectenna could enable large-scale adoption of NFC at low cost

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

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