Properties and applications of lossy metamaterials
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The complex permittivity (?) and permeability (?) of a material determines the response of the material to electromagnetic radiation. In many cases, the real part of ? and ? are both positive for materials that can be found in nature. Metamaterials (MTMs) are engineered media that are designed to have either a negative permittivity or a negative permeability or both. Negative permittivity and permeability cause electromagnetic waves travelling through this medium to exhibit unusual characteristics.The zero specular reflection layers using double negative (DNG) materials were examined in the first part of this thesis. The equations related to specular absorbers are analyzed based on the transmission line approach and numerical solutions are used in order to generate universal design charts for zero specular reflection absorbers. A MATLAB program is developed in order to generate the universal curves for double-positive (DPS) and DNG materials.Several methods to extract the effective permittivity and permeability of both normal materials and MTMs from measured or simulated scattering parameters were examined in the second part of this thesis. Microwave Studio (MWS) by Computer Simulation Technology (CST) was used to model the materials in a free space environment in order to calculate the S-parameters (S11 and S21) from which the constitutive parameters ? and ? can be extracted. The results were compared to published data.
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Feng, Bo-Kai (Monterey California. Naval Postgraduate School, 2006-09);In the frequency domain all materials can be described electrically by their complex permittivity and permeability. These constitutive parameters determine the response of the material to electromagnetic (EM) radiation. ...
Cotuk, Umit. (Monterey California. Naval Postgraduate School, 2005-09);The complex permittivity ( )Ì and permeability ( Ã¦) of a material determine the response of the material to electromagnetic radiation. Usually, the real parts of Ì and Ã¦ are positive for naturally occurring materials ...
Ting, Choon Boon (Monterey, California. Naval Postgraduate School, 2012-09);Materials are generally classified in terms of their constitutive parameters, the complex permittivity and permeability , in the frequency domain. These parameters are used to determine the response of materials to ...