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Träfflista för sökning "LAR1:lu ;pers:(Gustafsson Mats);lar1:(lnu);conttype:(refereed);lar1:(kth)"

Search: LAR1:lu > Gustafsson Mats > Linnaeus University > Peer-reviewed > Royal Institute of Technology

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1.
  • Ivanenko, Yevhen, et al. (author)
  • Passive Approximation and Optimization Using B-Splines
  • 2019
  • In: SIAM Journal on Applied Mathematics. - : SIAM PUBLICATIONS. - 0036-1399 .- 1095-712X. ; 79:1, s. 436-458
  • Journal article (peer-reviewed)abstract
    • A passive approximation problem is formulated where the target function is an arbitrary complex-valued continuous function defined on an approximation domain consisting of a finite union of closed and bounded intervals on the real axis. The norm used is a weighted L-p-norm where 1 <= p <= infinity. The approximating functions are Herglotz functions generated by a measure with Holder continuous density in an arbitrary neighborhood of the approximation domain. Hence, the imaginary and the real parts of the approximating functions are Holder continuous functions given by the density of the measure and its Hilbert transform, respectively. In practice, it is useful to employ finite B-spline expansions to represent the generating measure. The corresponding approximation problem can then be posed as a finite-dimensional convex optimization problem which is amenable for numerical solution. A constructive proof is given here showing that the convex cone of approximating functions generated by finite uniform B-spline expansions of fixed arbitrary order (linear, quadratic, cubic, etc.) is dense in the convex cone of Herglotz functions which are locally Holder continuous in a neighborhood of the approximation domain, as mentioned above. As an illustration, typical physical application examples are included regarding the passive approximation and optimization of a linear system having metamaterial characteristics, as well as passive realization of optimal absorption of a dielectric small sphere over a finite bandwidth.
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2.
  • Ludvig-Osipov, Andrei, et al. (author)
  • Fundamental Bounds on Transmission Through Periodically Perforated Metal Screens With Experimental Validation
  • 2020
  • In: IEEE Transactions on Antennas and Propagation. - : IEEE. - 0018-926X .- 1558-2221. ; 68:2, s. 773-782
  • Journal article (peer-reviewed)abstract
    • This article presents a study of transmission through arrays of periodic sub-wavelength apertures. Fundamental limitations for this phenomenon are formulated as a sum rule, relating the transmission coefficient over a bandwidth to the static polarizability. The sum rule is rigorously derived for arbitrary periodic apertures in thin screens. By this sum rule we establish a physical bound on the transmission bandwidth which is verified numerically for a number of aperture array designs. We utilize the sum rule to design and optimize sub-wavelength frequency selective surfaces with a bandwidth close to the physically attainable. Finally, we verify the sum rule and simulations by measurements of an array of horseshoe-shaped slots milled in aluminum foil.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed  (2)Undo refine
Author/Editor
Jonsson, B. Lars G. (2)
Gustafsson, Mats (2)Undo refine
Ivanenko, Yevhen (2)
Toft, Joachim, 1964- (1)
Lundgren, Johan (1)
Nilsson, Börje, 1949 ... (1)
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Sjoberg, Daniel (1)
Nordebo, Sven, 1963- (1)
Luger, Annemarie (1)
Ehrenborg, Casimir (1)
Ericsson, Andreas (1)
Ludvig-Osipov, Andre ... (1)
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University
Royal Institute of Technology  (2)Undo refine
Lund University (2)
Linnaeus University  (2)Undo refine
Stockholm University (1)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Engineering and Technology (2)

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