Briefs: Communications
Zero-Power Radio Receiver

There are several different types of wireless radio frequency identification (RFID) tags that are truly zero-power radios. Currently, most unpowered wireless RFID tags only have a range of a few meters. There are...

Briefs: Communications
System Integrates High-Speed Data and Wireless Power Transfer

Sources of wireless power — such as wireless cellphone charging pads — require near-physical contact with the pad, limiting the usefulness of a truly wireless power source. Recent...

Briefs: Communications
Tunable, High-Isolation RF/Microwave Circulator

A new high-isolation RF circulator provides enhanced detection ranges (radar) and improved reception (communications) by...

Briefs: Communications
Autonomous Positioning and Navigation Network

Engineers at NASA’s Marshall Space Flight Center have developed a machine-to-machine (M2M) network navigation protocol to...

Briefs: Communications
Paper-Thin Device Acts as a Loudspeaker and Microphone

A paper-thin, flexible device was created that can generate energy from human motion, and can act as a loudspeaker...

Briefs: Communications
Personal Annunciation Device (PAD)

Many industrial and commercial plants, government and private research facilities, and industrial facilities perform potentially dangerous processes. Automated warning and alarm systems alert personnel to...

Briefs: Communications
Mobile Underwater Acoustic Communications

Reliable, long-range acoustic communications (LRAC) is an enabling technology for numerous applications of manned and unmanned underwater systems. For example, with the capability of communicating at long...

Briefs: Communications
A Smooth-Walled Feedhorn with Sub-30-dB Cross-Polarization Over a 30-Percent Bandwidth

The focus of this research was the design, optimization, and measurement of a monotonically profiled, smooth-walled scalar feedhorn with a diffraction-limited...

Briefs: Communications
Wireless Virtual Reality Headset

One of the limits of today's virtual reality (VR) headsets is that they must be tethered to computers in order to process data well enough to deliver high-resolution visuals. Wearing an HDMI cable reduces mobility,...

Briefs: Communications
Wideband Retroreflector

There are many known methods of retransmitting radio wave signals intra-building and inter-building, as well as ground-to-aircraft or ground-to-satellite. Some techniques modulate the reflection coefficient of an antenna....

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