IIT Mandi researchers develop a new radar-invisible technology
New Radar invisible Technology
IIT Mandi researchers have created a material/structure that makes stealth vehicles and secret establishments less visible to radar. It is capable of absorbing a wide range of radar frequencies (signals), regardless of the direction from which the radar signal is coming. It can also be used for hiding stealth vehicles and covert establishments from radar by covering their windows or glass panels.
The results of this work are published in the journal, IEEE Letters on Electromagnetic Compatibility Practice and Applications, co-authored by Dr Shrikanth Reddy, Assistant Professor, School of Computing and Electrical Engineering, IIT Mandi and his team Dr Awanish Kumar (First Author) and Jyoti Bhushan Padhi.
About Radars
Radars are used in defence and civil sectors for surveillance, and navigation, to detect and track aircraft, ships, ground vehicles, and movements within covert establishments.
Being invisible to radar is a crucial defence strategy and the ability to evade radar detection can reduce the chances of being targeted by enemy weapons. Any technique that makes things invisible to radar can also be used in the commercial sector to reduce radiation leakages from buildings and make them more secure.
Radar Cross Section reduction makes something less visible to radar. In order to reduce RCS, materials that can absorb radar signals are used, or objects are shaped in a way that makes radar difficult to detect.
“We have developed a technology based on Frequency Selective Surface (FSS) that absorbs a wide range of frequencies used in radar, which makes the surface invisible to radar,” said Dr G Shrikanth Reddy, IIT Mandi.
What are FSS Patterns?
A PET sheet (polyethylene terephthalate) is a common thermoplastic that provides high dimensional stability, excellent mechanical strength and good resistance to creep. It offers resistance to chemicals and provides very low moisture absorption and is a good electrical insulator.
A PET sheet coated with ITO is used in the proposed design to create the FSS patterns. Using laser engraving, the FSS pattern was created on a PET sheet, and due to its symmetrical and lossy nature, the proposed absorber is polarization insensitive and absorbs EM waves in the C, X, and Ku bands.
It has been witnessed that this FSS technology can absorb more than 90 percent of the radar waves at a wide range of frequencies.
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