International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1568 A REVIEW PAPER ON TECHNIQUES AND DESIGN OF METAMATERIAL ABSORBER Garima Tiwari 1 , Nikunj Goyal 2 1 Assistant Professor, Dept of Electronics & Communication, Jabalpur Engineering College, Jabalpur, Madhya Pradesh, India 2 ME scholar Dept of Electronics & Communication, Jabalpur Engineering College, Jabalpur, Madhya Pradesh, India ------------------------------------------------------------------------***------------------------------------------------------------------------- Abstract - Metamaterials as they shows unusual electromagnetic wave characteristics that cannot be found in nature are widely used in many engineering applications like negative refraction [1], superlens [4], cloaking [3], antenna miniaturization [2] and so on. In this review paper a survey is conducted on commonly used techniques and different types of designs which is used by author to achieve peaks at different frequency range for an ultrathin, wide band ,affordable metamaterial absorber. KeyWords: Metamaterial absorber, Absorbtion, Unit-cell, Frequency 1. INTRODUCTION In recent years, electromagnetic (EM) metamaterials have gain significant research interests because of their attractive properties. Several important applications, such as super lens [4], cloaking [3], antenna miniaturization [2], absorption and many more have been proposed over the wide EM spectrum covering from microwave to visible regimes. Metamaterials are the artificially developed materials which shows the properties which cannot be available in natural materials like negative refraction index[1], clocking behavior[3], backward propagation, and reverse Doppler effects. Metamaterials shows the unique properties due to physical structure of the composite material irrespective of the chemical properties of the material. Generally, microwave absorbers are extensively used in many applications to reduce the electromagnetic interference in microwave components. But the large thickness (~λ/4) of the conventional microwave absorber structure is one of the major disadvantages. Metamaterial structure are used to remove this disadvantages and can add more benefits over it, where the ultra-thin structures having periodic unit cells can be used to obtain near unity absorption through ohmic and dielectric loss. To develop an Metamaterial absorber with good absorption characteristics different shapes are still being researched for constant improvement and better results. It was found that some geometry might have a wider bandwidth or better absorption characteristics than others at particular microwave frequencies. 2. LITERATURE SURVEY 2.1 N.I. Landy, S. Sajuyigbe, J.J. Mock, D.R. Smith, and W.J.Padilla “PERFECT METAMATERIAL ABSORBER”: Metamaterial absorber has been firstly proposed by Landy that shows maximum absorption at the frequency of 11.65 GHz with 96%.In this design, a single unit cell of the absorber consist of two distinct metallic elements at the front side there is split ring resonator and at the back side there is split-wire. Electric coupling was supplied by the electric ring resonator. This element consisted of two standard split ring resonators connected by the inductive ring parallel to the split-wire. (d) Figure.1 (a)Electric resonator (b)Cutwire (c)Unit cell (d)Simulated result showing Absorbtion,Reflection and Transmission