| 1. |
- Beilina, Larisa, 1970, et al.
(författare)
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Adaptive optimization algorithm for the computational design of nanophotonic structures
- 2016
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Ingår i: International Conference on Electromagnetics in Advanced Applications (ICEAA), 2016. - : IEEE. - 9781467398114
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Konferensbidrag (refereegranskat)abstract
- We consider the problem of the construction of the nanophotonic structures of arbitrary geometry with prescribed desired properties. We illustrate the efficiency of our adaptive optimization algorithm on the construction of nanophotonic structure in two dimensions.
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| 2. |
- Bondestam Malmberg, John, 1988, et al.
(författare)
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Adaptive finite element method for the solution of electromagnetic inverse problem using limited observations
- 2016
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Ingår i: 2016 International Conference on Electromagnetics in Advanced Applications (ICEAA). - : IEEE. - 9781467398114
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Konferensbidrag (refereegranskat)abstract
- We consider the problem of determination of a dielectric permittivity function from boundary observations of an electric field. We summarize our recent theoretical analysis of an adaptive finite element method for this problem, and present new numerical examples.
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| 3. |
- Ivanenko, Yevhen, et al.
(författare)
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Approximation of dielectric spectroscopy data with Herglotz functions on the real line and convex optimization
- 2016
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Ingår i: Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications. - : IEEE. - 9781467398114 ; , s. 863-866
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Konferensbidrag (refereegranskat)abstract
- This paper describes the ongoing research on approximation of frequency dielectric spectroscopy measurement data. The algorithm based on passive approximation, Hilbert transform and Tikhonov regularization for non-uniformly sampled data is derived. The interpolation and extrapolation problems with application to the dielectric spectroscopy measurement data are solved using convex optimization.
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| 4. |
- Jonsson, B. Lars G., et al.
(författare)
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Antenna Q based limitations for small and non-small structures
- 2016
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Ingår i: Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEAA 2016. - : IEEE. - 9781467398114 ; , s. 776-779
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Konferensbidrag (refereegranskat)abstract
- The impedance bandwidth of a small antenna is a critical design parameter. In the present paper, we present stored energies which can be used as a tool to predict the largest possible bandwidth for antenna designs within a given region. These predictions are given in terms of the best possible Q-factor that can be attained within the region. The here presented energies are valid for structures that support both electric and magnetic current densities, beyond the electrically small antenna size. The paper ends with illustrations of the method.
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| 5. |
- Nilsson, Börje, 1949-, et al.
(författare)
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On absence of sources at infinity and uniqueness for waveguide solutions
- 2016
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Ingår i: Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEEA 2016. - : IEEE Press. - 9781467398114 - 9781467398107 ; , s. 780-783
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Konferensbidrag (refereegranskat)abstract
- This paper discusses criteria for establishing uniqueness of wave propagation problems. Causality, or passivity that implies causality, is adopted as the fundamental principle. It is stressed that radiation conditions are not applicable for waveguide modes that carry no active power. The Jones' criteria for causality in the frequency domain, which covers the convectively unstable case, are presented and analysed, the vanishing absorption principle, VAP, in particular. It is proposed to use L2 for a lossy medium but a weighted L2 for the lossless case.
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