THE JOURNAL OF APPLIED PHYSICS HAS THE ENTIRE ABSTRACT, DETAILS, RESULTS <HERE>.
A NEW 'STEALTH MATERIAL'
"We believe it is possible to design an absorber that is both thin and that exhibits a broad bandwidth for near-meter microwave applications.
In this paper, we present an ultra-thin broadband AFSS absorber with a stretching transformation (ST) pattern for use in UHF applications. Using the transmission line (TL) model, we give the resonance frequency and the real part of the input impedance as functions of loaded and distributed parameters. "
"This result suggests that AFSS absorbers are practical candidates for broadband applications.
Our measurements and simulated results indicate that this AFSS absorber can be thin and achieve a broad bandwidth simultaneously."
WHAT DOES IT MEAN?
"China Has Developed an Aircraft “Wrap” to Keep Their Jet Fighters Under the Radar"
[The paper] ] details a material just 5/16 of an inch thick that can safeguard stealth planes against ultra-high-frequency (UFH) radar detection.
The majority of the airplanes currently flying the skies stay hidden from radar detection in two ways: (1) through their body geometry that reflects radio waves away from their receivers, and (2) due to materials that absorb the waves.
According to the source, aircraft such as the B-2 Spirit bomber, the F-22 and F-35 fighters are using such technologies, and it’s the Pentagon’s way to protect nuclear bombers, spy planes and so on.
These aircraft do share one weakness, though, which is the UHF radar, which can pick up traces of the plane that older generation radars miss.
That’s where China’s new technology comes in."
THIS MAY NOT SEEM LIKE A BIG DEAL, BUT IT IS.
Their proposed absorber is nearly ten times thinner than conventional ones.
That layer of material is placed under a. 04 mm thick layer of copper resistors that the scientists call an "active frequency selective surface material", or AFSS for short.
Experts said modern radar uses arrays of antennas that help the microwave energy to see through clouds, fog or smoke.
Something through which these waves would be absorbed would succeed in being unnoticed and it is the belief of the team that this can be done by the tunable new material at UHF or Ultra-High Frequency.
The new material, according to the scientists, would be able to absorb the energy so that the entire signal wouldn't make it back to the radar receiver.
Provided that signal is missing, an aircraft could look more like a high-flying bird."
IT CAN ALSO BE USED ON SHIPS.
CHINA has bankrolled more than 40 separate research efforts over the last three years, all aimed at developing technology that intends to quite literally render people and objects invisible.
A FEW OF THE MOST PROMISING TECHNOLOGIES (AS OF 2013) :
A team at the Nanjing University of Aeronautics and Astronautics, for instance, was funded by the National Natural Science Foundation of China to develop "full invisibility" technology and material for hypersonic jets similar to NASA's X-43A scramjet. The hypersonic vehicle could be used to delivered nuclear warheads around the globe with speed at least five times faster than sound.
Professor Ma Yungui, an optical engineering specialist at Zhejiang University, said his team would soon announce their latest finding: a device that stops objects being detected by heat sensors or metal detectors.