Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Introduction to metamaterials

1,524 views

Published on

This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.

Published in: Engineering
  • Be the first to comment

Introduction to metamaterials

  1. 1. Introduction to Metamaterials By Jagadish. M, Assistant Professor, Dept. of ECE, PES Institute of Technology and Management, Shivamogga
  2. 2. Introduction • Metamaterials (MTMs) are artificial structures designed to have properties not available in nature [1] • They are build from periodically arranged unit cells which carries small metallic resonators which interact with external electromagnetic wave. • The manner in which these external electromagnetic waves interact with these metallic “meta-atoms” of a metamaterial determines medium’s electromagnetic properties which may be made to enter highly unusual regimes-such as one where electromagnetic permittivity and magnetic permeability become simultaneously negative.
  3. 3. Introduction contd.. • The response of a metamaterial to an incident electromagnetic wave can be classified by assigning to it an effective permittivity and effective permeability • Such an assignment requires that the unit cell of metamaterials be much smaller than wavelength rreff  0 rreff  0 
  4. 4. Metamaterials with negative effective permittivity in the microwave regime • Metals at optical frequencies are characterized by an electric permittivity that varies with frequency according to Drude’s relation • is the plasma frequency • N, e, m being the electron density, charge and mass • is the rate at which the amplitude of plasma oscillation decreases. • When the medium is characterized by negative electric permittivity. 
  5. 5. Metamaterials with negative effective permeability in the microwave regime • The radius of the ring is r, and the whole arrangement is assumed to be immersed in air • The split ring resonator is equivalent to simple RLC circuit, R being the resistance of the metallic ring L its inductance and C the capacitance between its unconnected ends • The effective magnetic permeability with this medium is given by (1) • We can see that assumes negative values in the range (2) ..1 ..2 
  6. 6. Techniques to examine electromagnetic properties of MTMs Nicolson-Ross-Weir (NRW) technique [2] Field averaging approach[3-4] Curve-fitting approach [5] Dispersion equation method [6]
  7. 7. Applications of MTMs • Enhance radiation pattern and matching properties of antennas [7] • Reduce mutual coupling between antenna elements in array and reduce its size [8] Metamaterial as antenna • The electromagnetic black hole was built using MTMs [9] Metamaterial as cloaks
  8. 8. References 1. M.Lapine and S. Tretyakov, Contemporary notes on metamaterials, IET Microw. Antenna & Propagation1:3-11(2007) 2. D. R. Smith, D. C. Vier, N. Kroll, and S. Schultz, “Direct Calculation of Permeability and Permittivity for a Left-Handed Metamaterial,” Applied Physics Letters, 2000, 2246. 3. J. Lerat, N. Malléjac, and O. Acher, “Determination of the Effective Parameters of a Metamaterial by Field Summation Method,” Journal of Applied Physics, 2006, 084908. 4. A. Pors, I. Tsukerman, and S. I. Bozhevolnyi, “Effective Constitutive Parameters of Plasmonic Metamaterials: Homogenization by Dual Field Interpolation,” Physical Review E, 84, July, 2006, pp. 084908 (1-9). 5. G. Lubowski, R. Schuman, ad T. Weiland, “Extraction of Effective Metamaterial Parameters by Parameter Fitting of Dispersive Models,” Microwave and Optical Technology Letters, 2007, pp. 285-288. 6. R. A. Shore and A. Yaghjian, “Traveling Waves on Two and Three Dimensional Periodic Arrays of Lossless Scatterers,” Radio Science, 42, 2007, RS6S21, doi:10.1029/2007RS003647. 7. K. Gi-Cho, et al., "Ku-band high efficiency antenna with corporateseries- fed microstrip array," in Antennas and Propagation Society International Symposium, 2003. IEEE, 2003, pp. 690-693 vol.4. 8. Jagadish M, T Ramya, Pradeep A S . " Design and Performance Analysis of Compact MIMO Antenna by Mutual Coupling Suppression between Elements ", Vol. 3 - Issue 12 (December - 2014), International Journal of Engineering Research & Technology (IJERT) , ISSN: 2278-0181 , www.ijert.org 9. Qiang Chang, Tie Jun Cui, Wei Xiang Jiang and Ben Geng Cai, “An omnidirectional electromagnetic absorbermade of metamaterials”, New Journal of physics, 2010.

×