Marathwada Mitra Mandal’s Polytechnic, Thergaon,
Pune-33
Radar Absorbing Materials
Seminar Topic
Group Members
• Mr. Shaunak Aphale 130202
• Mr. Yash Gaikwad 130211
• Mr.Pranil Ghosalkar 130214
• Mr. Pragat Tiwari 1302
What is a RADAR?• RADAR is an object-detection system that
uses radio waves to determine the range, altitude, direction, or speed of objects.
• RADAR stands for RAdio Detection And Ranging.
• RADAR Works on the principle of Microwaves
Uses of a RADAR
• It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.
• For defense and security purposes.
Radar Absorbing Materials
• Radar-absorbent material, or RAM, is a class of materials used in stealth technology to disguise a vehicle or structure from radar detection.
• A common misunderstanding is that RAM makes an object invisible to radar.
• A radar-absorbent material can significantly reduce an object's radar cross-section in specific radar frequencies, but it does not result in "invisibility" on any frequency.
• Bad weather may contribute to deficiencies in stealth capability.
Radar Absorbing Materials
Types of RAMs
• Foam Absorber
• Jaumann Absorber
• Split Ring Resonator Absorber
• Iron Ball Paint Absorber
Foam Absorber• Foam absorber is used as lining of
anechoic chambers for electromagnetic radiation measurements.
• This material typically consists of a fireproofed urethane foam loaded with conductive carbon black in mixtures and cut into square pyramids with dimensions set specific to the wavelengths of interest.
Foam Absorber
Jaumann Absorber
• A Jaumann absorber or Jaumann layer is a radar-absorbent device.
• Being a resonant absorber, the wave can resonate at two frequencies, the Jaumann layer produces two absorption maxima across a band of wavelengths.
Jaumann Absorber
Split Ring Resonator Absorber
• Split ring resonators (SRR) in various test configurations have been shown to be extremely effective as radar absorbers.
• This technology uses photographic process to create a resist layer on a thin (~0.007") copper foil on a dielectric backing (thin circuit board material) that is etched into a tuned resonator arrays.
Split Ring Resonator Absorber
Iron Ball Paint• It contains tiny spheres coated with
carbonyl iron or ferrite.
• Radar waves induce molecular oscillations from the alternating magnetic field in this paint, which leads to conversion of the radar energy into heat.
• The heat is then transferred to the aircraft and dissipated.
Iron Ball Paint
Thank You!
References
• http://www.livescience.com/32943-how-stealth-planes-evade-enemy.html
• http://www.alibaba.com/showroom/iron-ball-paint-suppliers.html
• http://www.alaska.net/~chazmo/stealth.html• http://en.wikipedia.org/wiki/Iron_ball_paint
KEEP CALM
USE R.A.M. FOR RADAR
AND
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