Antennas

Microwave antennas deployed for spaceborne radiometers are diffraction-limited, with typical beam efficiency of about 90%, and provide relatively poor selectivity against radiation from celestial bodies (Moon, Sun, galaxy) when they are...

Non-Linear Junction Detection is a well-known technique for detecting electronics that utilize semiconductor (solid-state) junctions. The current state of the art for finding hidden electronics — such as electronic eavesdropping devices — using this technology has a maximum range of about 2 m, and more...

Many methods have been developed for interrogation of wireless passive sensors. Surface acoustic wave (SAW) sensors and RF reflection sensors can receive and reflect electronic magnetic waves that are broadcast and received by the antennas....

Researchers from North Carolina State University have developed a technique for controlling the surface tension of liquid metals by applying very low voltages, opening the door to a new generation of reconfigurable electronic circuits, antennas and other technologies. The technique hinges on the...

As a high school student at a study program in Japan, Brian Trease would fold wrappers from fast-food cheeseburgers into cranes. He loved discovering different origami techniques in library books.Today, Trease, a mechanical engineer at NASA’s Jet Propulsion Laboratory in Pasadena, California,...

Using radio signals from satellite navigation systems, Scientists at Chalmers Department of Earth and Space Sciences have developed and tested a Global Navigation Satellite System (GNSS) tide gauge, an instrument that measures the sea level.The GNSS tide gauge uses radio signals from satellites in orbit...

Wireless Telemetry System Captures Complex Flight of Dragonflies Duke University electrical engineers have developed a wirelessly powered telemetry system that is light and powerful enough to allow scientists to study the intricate neurological activity of dragonflies as they capture...

University of Michigan engineering researchers are working on a global satellite project that would help predict the intensity of a hurricane while it is developing. In coordination with NASA, Michigan Engineering Professor Chris Ruf is working on the Cyclone Global Navigation Satellite...

Antennas, filters, amplifiers, and mixers are building blocks that are utilized in many existing defense weapons and Department of Defense (DoD) systems. In this white paper from Emerson & Cumming, new and emerging transceiver technologies as well as military applications are discussed.

A prototype wireless data-acquisition system has been developed as a potential replacement for a wired data-acquisition system heretofore used in testing rocket engines. The traditional use of wires to connect sensors, signal-conditioning circuits, and data acquisition circuitry is...