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Sökning: LAR1:lu > Sjöberg Daniel > Lunds universitet > (2010-2011)

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31.
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32.
  • Sjöberg, Daniel, et al. (författare)
  • Physical bounds on the all-spectrum transmission through periodic arrays: oblique incidence
  • 2010
  • Ingår i: Europhysics Letters. - : IOP Publishing. - 0295-5075. ; 92, s. 1-34009
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The performance of a low-pass screen designed to block electromagnetic waves in a stop-band is shown to have an upper bound defined by the static electric and magnetic polarizability per unit area of the screen. The bound is easy to calculate for all angles of incidence and polarizations, and applies regardless of how complicated the screen's microstructure is. For a homogeneous dielectric sheet the bound for TM polarization is more restrictive than the bound for TE, but this is not generally true for a screen with microstructure. The results are verified by measurements and simulations of oblique transmission through an array of split ring resonators, printed on a dielectric substrate.
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33.
  • Sjöberg, Daniel, et al. (författare)
  • Realization of a matching region between a radome and a ground plane
  • 2010
  • Ingår i: Progress In Electromagnetics Research Letters. - 1937-6480. ; 17, s. 1-10
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • In order to reduce the monostatic signature of the junction between a radome and the metallic structure to which it is attached, a tapered resistive sheet can be used. In this paper, we describe an easy method to realize this tapering using geometric variations on a subwavelength scale, with a significant reduction of the number of processing steps as a result.
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34.
  • Sten, Johan C.-E., et al. (författare)
  • Low-frequency scattering analysis and homogenisation of split-ring elements
  • 2011
  • Ingår i: Progress In Electromagnetics Research B. - 1937-6472. ; 35, s. 187-212
  • Tidskriftsartikel (refereegranskat)abstract
    • A key structure in so-called metamaterial mediums is the elementary split-ring resonator. We consider in this paper the low-frequency electromagnetic scattering by a split-ring particle modelled as a perfectly conducting wire ring, furnished with a narrow gap, and derive analytical solutions for the electric and magnetic dipole moments for different kinds of incidence and polarisation in the quasi-static approximation. Through a vectorial homogenisation process, the expressions discovered for the dipole moments and the related polarisability dyadics are linked with the macroscopic constitutive equations for the medium. We further show that the condition for resonance of a medium consisting of simple split-rings cannot be achieved by means of the given quasi-static terms without violating the underlying assumptions of homogenisation. Nevertheless, the results are applicable for sparse medium of rings, and we derive numerical guidelines for the applicability with some examples of the effect of the considered split-ring medium on electromagnetic wave propagation.
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  • Resultat 31-34 av 34

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