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