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The Wigner-Smith (WS) time delay matrix relates an electromagnetic system's scattering matrix and its frequency derivative. Previous work showed that the entries of WS time delay matrices of systems excited by propagating waves consist of volume inte
Externí odkaz:
http://arxiv.org/abs/2206.02571
The Wigner-Smith (WS) time delay matrix relates a system's scattering matrix to its frequency derivative and gives rise to so-called WS modes that experience well-defined group delays when interacting with the system. For systems composed of nondispe
Externí odkaz:
http://arxiv.org/abs/2206.01403
The Wigner-Smith (WS) time delay matrix relates an acoustic system's scattering matrix to its wavenumber derivative. The entries of the WS time delay matrix can be expressed in terms of energy density-like volume integrals, which cannot be efficientl
Externí odkaz:
http://arxiv.org/abs/2205.12725
The Wigner-Smith (WS) time delay matrix relates a lossless system's scattering matrix to its frequency derivative. First proposed in the realm of quantum mechanics to characterize time delays experienced by particles during a collision, this article
Externí odkaz:
http://arxiv.org/abs/2205.07347
An integral equation-based approach for the design of dual band stacked metasurfaces which are invariant in one-dimension is presented. The stacked metasurface will generate collimated beams at desired angles in each band upon reflection. The conduct
Externí odkaz:
http://arxiv.org/abs/2103.03676
Autor:
Patel, Utkarsh R., Michielssen, Eric
The WS time delay matrix relates a lossless and reciprocal system's scattering matrix to its frequency derivative, and enables the synthesis of modes that experience well-defined group delays when interacting with the system. The elements of the WS t
Externí odkaz:
http://arxiv.org/abs/2005.03211
Autor:
Patel, Utkarsh R., Michielssen, Eric
Publikováno v:
IEEE Trans. on Antennas \& Propag., vol. 69, no. 2, Feb. 2021
Wigner-Smith (WS) time delay concepts have been used extensively in quantum mechanics to characterize delays experienced by particles interacting with a potential well. This paper formally extends WS time delay theory to Maxwell's equations and explo
Externí odkaz:
http://arxiv.org/abs/2003.06985
This paper presents an adaptive randomized algorithm for computing the butterfly factorization of a $m\times n$ matrix with $m\approx n$ provided that both the matrix and its transpose can be rapidly applied to arbitrary vectors. The resulting factor
Externí odkaz:
http://arxiv.org/abs/2002.03400
Boundary integral equation methods for analyzing electromagnetic scattering phenomena typically suffer from several of the following problems: (i) ill-conditioning when the frequency is low; (ii) ill-conditioning when the discretization density is hi
Externí odkaz:
http://arxiv.org/abs/1903.08217
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