Universal Zero Specular Reflection Curves for MetaMaterials
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Materials are generally classified in terms of their constitutive parameters, the complex permittivity and permeability epsilon in the frequency domain. These parameters are used to determine the response of materials to electromagnetic EM radiation. Materials found in nature have positive real parts for both epsilon and mu. In recent years, researchers have shown that a new class of materials called metamaterials MTMs, characterized by inclusions of various shapes and materials that are small compared to wavelength, result in an effectively homogeneous medium with the unique properties of negative real and which cause EM waves traveling through the medium to exhibit unusual characteristics. Zero specular reflection layers for four material types such as double positive DPS, double negative DNG, epsilon-negative ENG and mu-negative MNG materials are examined in this thesis. For each defined type of MTM, the transcendental equations are derived and solved numerically to generate curves for zero specular reflection. A MATLAB program was developed to generate universal curves for DPS, DNG, ENG, and MNG materials. The results were discussed and evaluated to determine wave behavior in each type of MTM as well as how they can be used as a matched-surface radar-absorbing material RAM for military application. The results were compared to published data.
- Radiofrequency Wave Propagation