Sökning: "metamaterial"

Visar resultat 21 - 24 av 24 avhandlingar innehållade ordet metamaterial.

  1. 21. Modelling strategies for thin imperfect interfaces and layers

    Författare :Mathieu Gaborit; Peter Göransson; Olivier Dazel; Lucie Rouleau; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; uncertainties; thin layers; numerical methods; simplified models; poroelastic materials; incertitudes; couches fines; méthodes numeriques; modèles simplifiés; matériaux poroélastiques; osäkerheter; tunna lager; numeriska metoder; förenklade modeller; poroelastiska medier; Engineering Mechanics; Teknisk mekanik;

    Sammanfattning : The global trend towards quieter environments has been one of the key topics of acoustics research for years. The recent tightening of the regulations on noise exposure as well as the many reports on the impact of noise on human health confirm this situation and stress ever more the need for innovative mitigation strategies. LÄS MER

  3. 22. Tinkering with Light at the Nanoscale using Plasmonic Metasurfaces and Antennas: From Fano to Function

    Författare :Mikael Svedendahl; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; biosensing; Fano resonances; metamaterials; Surface plasmons;

    Sammanfattning : Surface plasmons are charge density oscillations that can couple strongly to light and be excited in, for instance, thin metal films and metal nanoparticles. The plasmonic excitation squeezes the light down to nanometric length scales, far smaller than the wavelength of the light. LÄS MER

  4. 23. Micromachined Gap Waveguide Devices

    Författare :Sofia Rahiminejad; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MEMS; Gap waveguides; RF; High frequency; GHz; Waveguide;

    Sammanfattning : Gap waveguide technology is a new technology that is well suited for millimeter and submillimeter applications. Compared to conventional rectangular waveguides, this technology does not need any solid conductive walls to confine the wave by utilizing metamaterial surfaces such as "bed of nails" that creates an artificial magnetic conductive surface (AMC). LÄS MER

  5. 24. Integral Identities for Passive Systems and Spherical Waves in Scattering and Antenna Problems

    Författare :Anders Bernland; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dispersion relations; sum rules; physical limitations; Herglotz functions; electromagnetic scattering; antenna theory; spherical wave expansions; antenna measurements; propagation channel measurements;

    Sammanfattning : Sum rules and physical limitations within electromagnetic theory and antenna theory have received significant attention in the last few years. However, the derivations are often relying on application specific and sometimes unsupported assumptions, and therefore a mathematically rigorous and generally applicable approach seems timely. LÄS MER