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With New Technology, Chinese Fighter Jets Could Fly Under the Radar
15 December 2015
[DIGEST: Defense One, Popular Mechanics, Daily Mail, Tech Times, National Security News]
Chinese scientists have invented a new material that could allow fighter jets and other warcraft to hide from radars, making them virtually invisible with current technology.
<p><a href="http://www.popularmechanics.com/military/research/a18165/chinese-researchers-develop-stealth-material-for-jets/" target="_blank"><span style="font-weight: 400;">Current advanced radar technology</span></a><span style="font-weight: 400;"> works by broadcasting signals at ultrahigh frequencies, which bounce off objects, like jets. The returning microwave signals are detected by antennae, allowing technicians to identify objects and gain a rough understanding of their size, even when concealed by clouds or fog.</span></p><p><div id="action_button_container"></div></p><p><span style="font-weight: 400;">While there are currently materials in use that can absorb these ultrahigh frequencies, they have historically been </span><a href="http://www.defenseone.com/technology/2015/11/chinese-scientists-unveil-new-stealth-material-breakthrough/123622/?oref=d-dontmiss" target="_blank"><span style="font-weight: 400;">too thick</span></a><span style="font-weight: 400;"> to be practical in the construction of fighter jets. </span></p><p><span style="font-weight: 400;">Until now. </span></p><p><span style="font-weight: 400;">In a paper published by a team of scientists from China’s Huazhong University of Science and Technology in the </span><a href="http://scitation.aip.org/content/aip/journal/jap/118/18/10.1063/1.4934683" target="_blank"><span style="font-weight: 400;">Journal of Applied Physics</span></a><span style="font-weight: 400;">, the team described their newly-developed radar-defeating surface. This material, called “</span><a href="http://www.popularmechanics.com/military/research/a18165/chinese-researchers-develop-stealth-material-for-jets/" target="_blank"><span style="font-weight: 400;">active frequency selective surface material</span></a><span style="font-weight: 400;">,” or AFSS, is comprised of copper resistors and capacitors that</span></p><p><div data-conversation-spotlight=""></div></p><p><b></b></p><p><span style="font-weight: 400;">absorb microwave energy and other ultrahigh frequency signals. The AFSS is sandwiched between a metal slab, a layer of metal honeycomb and a circuit board with semi-conducting diodes and capacitors. </span></p><p><span style="font-weight: 400;">The AFSS can be stretched, or “tuned,” to absorb a wide range of frequencies, including ultrahigh frequencies. It is the </span><a href="http://www.dailymail.co.uk/sciencetech/article-3315132/Building-ultimate-stealth-bomber-Material-hides-objects-advanced-radars-lead-undetectable-fighter-jets.html" target="_blank"><span style="font-weight: 400;">first time</span></a><span style="font-weight: 400;"> that stretching technology has been used in AFSS to expand the bandwidth of the waves it can absorb.</span></p><p><span style="font-weight: 400;">The key to AFSS is its depth. At only 0.04 millimeters, the “proposed absorber is almost ten times thinner than conventional ones,” said </span><a href="http://www.defenseone.com/technology/2015/11/chinese-scientists-unveil-new-stealth-material-breakthrough/123622/?oref=d-dontmiss" target="_blank"><span style="font-weight: 400;">Wenhua Xu</span></a><span style="font-weight: 400;">, one of the paper’s authors. The width makes it practical—for the first time-- for </span><a href="http://www.nationalsecurity.news/2015-11-17-did-china-just-make-a-breakthrough-in-stealth-technology.html" target="_blank"><span style="font-weight: 400;">application on military jets</span></a><span style="font-weight: 400;">. If the radar-absorbing material works as intended, it would prevent all of the microwave signals from bouncing back, masking the aircraft’s true size. In practical terms, this means a technician could be fooled into thinking a </span><a href="http://www.defenseone.com/technology/2015/11/chinese-scientists-unveil-new-stealth-material-breakthrough/123622/?oref=d-dontmiss" target="_blank"><span style="font-weight: 400;">jet was just a passing bird</span></a><span style="font-weight: 400;">.</span></p><p><span style="font-weight: 400;">While the level of detail regarding the components and structure of the new material suggests that the Chinese are not attempting to secretly develop this technology, it does leave some worried. The paper is further evidence of China’s </span><a href="http://www.popularmechanics.com/military/research/a18165/chinese-researchers-develop-stealth-material-for-jets/" target="_blank"><span style="font-weight: 400;">significant advances</span></a><span style="font-weight: 400;"> in stealth technology. Stealth is considered to be one of the </span><a href="http://www.defenseone.com/technology/2015/11/chinese-scientists-unveil-new-stealth-material-breakthrough/123622/?oref=d-dontmiss" target="_blank"><span style="font-weight: 400;">key technologies</span></a><span style="font-weight: 400;"> of modern warfare –and a vital component to the United States’ military dominance over the past century. The paper, which was sponsored by a Chinese government foundation grant, is causing some to question whether China has </span><a href="http://www.techtimes.com/articles/106816/20151115/china-develops-stealth-material-that-can-hide-jets-ships-from-radar.htm" target="_blank"><span style="font-weight: 400;">already adopted</span></a><span style="font-weight: 400;"> this technology on their current fighter jets. And if so, for just how long China has been flying under the figurative—and literal—radar. </span></p>
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