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Ioannidis, Andreas
Publications (9 of 9) Show all publications
Nilsson, B., Ioannidis, A., Ivanenko, Y. & Nordebo, S. (2016). On absence of sources at infinity and uniqueness for waveguide solutions. In: Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEEA 2016: . Paper presented at 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEEA, 19-23 Sept. 2016 (pp. 780-783). IEEE Press
Open this publication in new window or tab >>On absence of sources at infinity and uniqueness for waveguide solutions
2016 (English)In: Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEEA 2016, IEEE Press, 2016, p. 780-783Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
IEEE Press, 2016
National Category
Mathematical Analysis
Research subject
Mathematics, Applied Mathematics; Physics, Waves and Signals
Identifiers
urn:nbn:se:lnu:diva-60614 (URN)10.1109/ICEAA.2016.7731515 (DOI)2-s2.0-85007301251 (Scopus ID)978-1-4673-9811-4 (ISBN)978-1-4673-9810-7 (ISBN)
Conference
2016 18th International Conference on Electromagnetics in Advanced Applications, ICEEA, 19-23 Sept. 2016
Available from: 2017-02-09 Created: 2017-02-09 Last updated: 2017-06-09Bibliographically approved
Nordebo, S., Cinar, G., Gustafsson, S., Ioannidis, A. & Nilsson, B. (2014). Asymptotic analysis of non-discrete radiating modes for open waveguide structures. Mathematical methods in the applied sciences, 37(2, Special Issue), 251-256
Open this publication in new window or tab >>Asymptotic analysis of non-discrete radiating modes for open waveguide structures
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2014 (English)In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 37, no 2, Special Issue, p. 251-256Article in journal (Refereed) Published
Abstract [en]

This paper presents an asymptotic analysis of non-discrete radiating modes with applications in waveguide theory. As a main application, the radiating modes of an open waveguide structure with circular geometry is considered. A generalized Jordan's lemma is used to justify that field components can be calculated as the sum of discrete and non-discrete modes, that is, as the sum of residues of poles and an integral along the branch-cut defined by the transversal wavenumber of the exterior domain. An asymptotic expression is derived for field components at large distance along the waveguide and supplemented with rigorous upper and lower error bounds. A numerical example regarding the axial symmetric 0th order transverse magnetic modes of a thin copper wire in water is included to demonstrate that there may be a non-trivial balance between the contributions from discrete and non-discrete modes.

Place, publisher, year, edition, pages
John Wiley & Sons, 2014
National Category
Engineering and Technology
Research subject
Physics, Waves and Signals
Identifiers
urn:nbn:se:lnu:diva-27488 (URN)10.1002/mma.2821 (DOI)000328520100016 ()2-s2.0-84890790594 (Scopus ID)
Available from: 2013-07-09 Created: 2013-07-09 Last updated: 2017-12-06Bibliographically approved
Ioannidis, A., Nilsson, B. & Nordebo, S. (2013). A mathematical framework for propagation in an open cavity. In: Proceeding of 2013 URSI International Symposium on Electromagnetic Theory (EMTS): International Conference Center HiroshimaHiroshima, Japan, May 20-24, 2013. Paper presented at 2013 International Symposium on Electromagnetic Theory, (EMTS), Hiroshima, 20-23 May, 2013 (pp. 1043-1046). IEEE Press
Open this publication in new window or tab >>A mathematical framework for propagation in an open cavity
2013 (English)In: Proceeding of 2013 URSI International Symposium on Electromagnetic Theory (EMTS): International Conference Center HiroshimaHiroshima, Japan, May 20-24, 2013, IEEE Press, 2013, p. 1043-1046Conference paper, Published paper (Refereed)
Abstract [en]

The purpose of this paper is to establish a formal mathematical framework for the electromagnetic wave propagation in an arbitrary cavity. The walls of the cavity are not assumed perfectly conducting and we use the transmission boundary conditions for the tangential fields. Our main tool is the Laplace transform. The focus here is on the modeling and detailed proofs or calculations are not provided.

Place, publisher, year, edition, pages
IEEE Press, 2013
Series
URSI International Symposium on Electromagnetic Theory, ISSN 2163-405X
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Physics, Waves and Signals
Identifiers
urn:nbn:se:lnu:diva-25988 (URN)000327180500267 ()978-1-4673-4939-0 (ISBN)
Conference
2013 International Symposium on Electromagnetic Theory, (EMTS), Hiroshima, 20-23 May, 2013
Available from: 2013-05-31 Created: 2013-05-31 Last updated: 2017-01-10Bibliographically approved
Nordebo, S., Gustafsson, S., Ioannidis, A., Nilsson, B. & Toft, J. (2013). On the generalized Jordan's lemma with applications in waveguide theory. In: Proceeding of 2013 URSI International Symposium on Electromagnetic Theory (EMTS): International Conference Center Hiroshima, Hiroshima, Japan, May 20-24, 2013. Paper presented at International Symposium on Electromagnetic Theory (EMTS), May 20-23, 2013, Hiroshima (pp. 1039-1042).
Open this publication in new window or tab >>On the generalized Jordan's lemma with applications in waveguide theory
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2013 (English)In: Proceeding of 2013 URSI International Symposium on Electromagnetic Theory (EMTS): International Conference Center Hiroshima, Hiroshima, Japan, May 20-24, 2013, 2013, p. 1039-1042Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents two variants of a generalized Jordan's lemma with applications in waveguide theory. As a main application is considered an asymptotic analysis for open waveguide structures with circular geometry. In particular, the generalized Jordan's lemma can be used to justify that field components can be calculated as the sum of discrete and non-discrete modes, i.e., as the sum of residues and an integral along the branch-cut defined by the transversal wavenumber of the exterior domain. An explicit example regarding the axial symmetric TM0 modes of a single core transmission line, wire, or optical fibre is included to demonstrate the associated asymptotic behavior for a typical open waveguide structure.

Series
URSI International Symposium on Electromagnetic Theory, ISSN 2163-405X
Keywords
Dispersion, Educational institutions, Electromagnetics, Geometry, Optical waveguides, Standards
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Physics, Waves and Signals
Identifiers
urn:nbn:se:lnu:diva-25987 (URN)000327180500266 ()978-4-88552-277-2 (ISBN)
Conference
International Symposium on Electromagnetic Theory (EMTS), May 20-23, 2013, Hiroshima
Available from: 2013-05-31 Created: 2013-05-31 Last updated: 2017-01-11Bibliographically approved
Nordebo, S., Ioannidis, A. & Nilsson, B. (2013). Reduced volume integral formulations for an open waveguide based on the cylindrical vector wave expansion. In: PIERS 2013 Stockholm: Progress in Electromagnetics Research Symposium : Proceedings. Paper presented at Progress in Electromagnetics Research Symposium, PIERS 2013 Stockholm, 12 August 2013 through 15 August 2013, Stockholm (pp. 633-637). Electromagnetics Academy
Open this publication in new window or tab >>Reduced volume integral formulations for an open waveguide based on the cylindrical vector wave expansion
2013 (English)In: PIERS 2013 Stockholm: Progress in Electromagnetics Research Symposium : Proceedings, Electromagnetics Academy , 2013, p. 633-637Conference paper, Published paper (Refereed)
Abstract [en]

A Fourier representation of the electric field volume integral equation for an open and cylindrically symmetrical waveguide is given in this paper. The waveguide material is assumed to be isotropic, non-magnetic and with an arbitrary radial variation in the relative permittivity. The Fourier representation yields a system of one-dimensional integral equations, one system for each azimuthal index and where the Fourier variable for the longitudinal direction plays the role of a spectral parameter. The integral equation is of the second kind and has a kernel that is generally discontinuous on the diagonal and singular at the origin. In the axial symmetric case, it can readily be shown that the elements of the matrix kernel belong to an L2-space, and hence that the integral operator is compact and the analytic Fredholm theorem is applicable.

Place, publisher, year, edition, pages
Electromagnetics Academy, 2013
Series
Progress in Electromagnetics Research Symposium, ISSN 1559-9450
National Category
Physical Sciences Mathematics
Research subject
Natural Science, Physics; Natural Science, Mathematics
Identifiers
urn:nbn:se:lnu:diva-59326 (URN)000361384200132 ()2-s2.0-84884756886 (Scopus ID)9781934142264 (ISBN)
Conference
Progress in Electromagnetics Research Symposium, PIERS 2013 Stockholm, 12 August 2013 through 15 August 2013, Stockholm
Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2018-05-17Bibliographically approved
Costanza, G. & Ioannidis, A. (2013). Remarks on the mathematical solution of the hollow cavity eigenvalue problem. In: Progress in Electromagnetics Research Symposium: . Paper presented at Progress in Electromagnetics Research Symposium, PIERS 2013 Stockholm, 12 August 2013 through 15 August 2013, Stockholm (pp. 79-83). Electromagnetics Acad.
Open this publication in new window or tab >>Remarks on the mathematical solution of the hollow cavity eigenvalue problem
2013 (English)In: Progress in Electromagnetics Research Symposium, Electromagnetics Acad. , 2013, p. 79-83Conference paper, Published paper (Refereed)
Abstract [en]

We discuss the eigenvalue problem for a perfectly conducting hollow cavity under a strict functional analytic point of view. We make use of a variant of the classical spectral theorem for compact selfadjoint operators and we pay extra attention on the null space of the Maxwell operator. We also discuss the corresponding inhomogeneous problem, where currents are present, even when they may depend on the fields.

Place, publisher, year, edition, pages
Electromagnetics Acad., 2013
Series
Progress in Electromagnetics Research Symposium, ISSN 1559-9450
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
urn:nbn:se:lnu:diva-59327 (URN)2-s2.0-84884799516 (Scopus ID)9781934142264 (ISBN)
Conference
Progress in Electromagnetics Research Symposium, PIERS 2013 Stockholm, 12 August 2013 through 15 August 2013, Stockholm
Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2018-05-17Bibliographically approved
Argyropoulou, E. & Ioannidis, A. (2013). The eigenvalue problem for a bianisotropic cavity. In: PIERS proceedings 2013: Progress in Electromagnetics Research Symposium. Paper presented at Progress in Electromagnetics Research Symposium, PIERS 2013 Stockholm, 12 August 2013 - 15 August 2013, Stockholm (pp. 858-862). Electromagnetics Acad
Open this publication in new window or tab >>The eigenvalue problem for a bianisotropic cavity
2013 (English)In: PIERS proceedings 2013: Progress in Electromagnetics Research Symposium, Electromagnetics Acad , 2013, p. 858-862Conference paper, Published paper (Refereed)
Abstract [en]

We discuss the eigenvalue problem for a perfectly conducting bianisotropic cavity. We formulate the corresponding mathematical problem and we give a characterization of the eigenelements (non-zero eigenfrequencies and modes) via a perturbation argument involving the eigenelements of the hollow cavity.

Place, publisher, year, edition, pages
Electromagnetics Acad, 2013
Series
Progress in Electromagnetics Research Symposium, ISSN 1559-9450
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
urn:nbn:se:lnu:diva-59328 (URN)000361384200180 ()2-s2.0-84884800305 (Scopus ID)9781934142264 (ISBN)
Conference
Progress in Electromagnetics Research Symposium, PIERS 2013 Stockholm, 12 August 2013 - 15 August 2013, Stockholm
Available from: 2017-05-08 Created: 2017-05-08 Last updated: 2018-05-17Bibliographically approved
Nilsson, B., Nordebo, S., Gustafsson, S. & Ioannidis, A. (2012). Long distance source localization in waveguides with complicated structure. In: 2012 International Conference on Mathematical Methods in Electromagnetic Theory (MMET): . Paper presented at 14th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), Kharkiv Natl Acad Municipal Econ, Kharkiv, UKRAINE, AUG 28-30, 2012 (pp. 415-418). Los Almitos: IEEE
Open this publication in new window or tab >>Long distance source localization in waveguides with complicated structure
2012 (English)In: 2012 International Conference on Mathematical Methods in Electromagnetic Theory (MMET), Los Almitos: IEEE, 2012, p. 415-418Conference paper, Published paper (Other academic)
Abstract [en]

With the purpose of source localization in high voltage direct current submarine power cables general layered waveguide models are investigated. It is concludes that the non-discrete modes can usually be ignored in comparison with the least attenuated discrete mode. Only a finite number of discrete modes are of importance for a band limited signal. Accurate analytical expressions are derived in the time domain for both discrete and non-discrete electromagnetic waveguide modes for large distances together with an error analysis.

Place, publisher, year, edition, pages
Los Almitos: IEEE, 2012
National Category
Physical Sciences
Identifiers
urn:nbn:se:lnu:diva-24515 (URN)10.1109/MMET.2012.6331242 (DOI)000312848800090 ()2-s2.0-84870807151 (Scopus ID)978-1-4673-4478-4 (ISBN)
Conference
14th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), Kharkiv Natl Acad Municipal Econ, Kharkiv, UKRAINE, AUG 28-30, 2012
Note

Conference: 14th International Conference on Mathematical Methods in Electromagnetic Theory (MMET) Location: Kharkiv Natl Acad Municipal Econ, Kharkiv, UKRAINE Date: AUG 28-30, 2012

Available from: 2013-02-22 Created: 2013-02-22 Last updated: 2017-04-24Bibliographically approved
Ioannidis, A., Kristensson, G. & Stratis, I. G. (2012). On the Well-Posedness of the Maxwell System for Linear Bianisotropic Media. SIAM Journal on Mathematical Analysis, 44(4), 2459-2473
Open this publication in new window or tab >>On the Well-Posedness of the Maxwell System for Linear Bianisotropic Media
2012 (English)In: SIAM Journal on Mathematical Analysis, ISSN 0036-1410, E-ISSN 1095-7154, Vol. 44, no 4, p. 2459-2473Article in journal (Refereed) Published
Abstract [en]

The time-dependent Maxwell system is supplemented with the constitutive relations of linear bianisotropic media and is treated as a neutral integro-differential equation in a Hilbert space. By using the theory of abstract Volterra equations and strongly continuous semigroups we obtain general well-posedness results for the corresponding mathematical problem.

Keywords
Maxwell system, linear bianisotropic media, neutral integro-differential equation
National Category
Mathematics
Research subject
Natural Science, Mathematics
Identifiers
urn:nbn:se:lnu:diva-22706 (URN)10.1137/100817401 (DOI)000310137800010 ()2-s2.0-84866126377 (Scopus ID)
Available from: 2012-12-05 Created: 2012-12-05 Last updated: 2017-12-07Bibliographically approved
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