Constantinos Valagiannopoulos, PhD

Assistant Professor

Accepting PhD Students

  • 1006 Citations
  • 20 h-Index
20042021
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Research Output 2004 2019

  • 1006 Citations
  • 20 h-Index
  • 88 Article
  • 38 Conference contribution
  • 1 Conference article
  • 1 Review article
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Conference contribution
2019

Revisiting beamforming under the prism of inverse methods

Valagiannopoulos, C. & Kovanis, V., Jan 1 2019, Physics and Simulation of Optoelectronic Devices XXVII. Osinski, M., Witzigmann, B. & Arakawa, Y. (eds.). SPIE, 109120Q. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 10912).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Inverse Method
Prism
beamforming
Beamforming
Prisms
2018

Achieving Anomalous Refraction with Metasurfaces Composed by Two Ordinary Dielectric Materials

Tsitsas, N. L. & Valagiannopoulos, C., Nov 13 2018, 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena, METAMATERIALS 2018. Institute of Electrical and Electronics Engineers Inc., p. 395-397 3 p. 8534170

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Refraction
Integral equations
integral equations
refraction
rods

Nonlinear waves in hyperbolic metamaterials: Focus on solitons and rogues

Boardman, A. D., Grimalsky, V. V., Guo, T., Kibler, B., McNiff, J., Nefedov, I., Rapoport, Y., Argyropoulos, C. & Valagiannopoulos, C., Jan 1 2018, Metamaterials XI. SPIE, Vol. 10671. 106710L

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Metamaterials
Nonlinear Waves
Solitons
nonlinear equations
solitary waves

On self-oscillating wireless power transfer

Tretyakov, S., Valagiannopoulos, C., Ra'Di, Y. & Simovski, C., Jan 2 2018, 2017 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems, COMCAS 2017. Institute of Electrical and Electronics Engineers Inc., Vol. 2017-November. p. 1-3 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microwaves
microwaves
receivers
electric generators
antennas
1 Citation (Scopus)

Optimized Operation of Photonic Devices with Use of Ordinary Bulk Materials

Valagiannopoulos, C., Nov 13 2018, 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena, METAMATERIALS 2018. Institute of Electrical and Electronics Engineers Inc., p. 495-497 3 p. 8534066

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Photonic devices
Refraction
photonics
Scattering
Fabrication
2017
1 Citation (Scopus)

Mitigating Snell's-Law reflection and transmission with metasurfaces of ordinary dielectrics

Tsitsas, N. L. & Valagiannopoulos, C. A., Oct 11 2017, Proceedings of the 2017 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017. Institute of Electrical and Electronics Engineers Inc., p. 1160-1163 4 p. 8065474

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wave transmission
boundary value problems
Boundary value problems
Integral equations
integral equations
2016

Analytical investigations of ground modifications assisting the detection of a buried object

Valagiannopoulos, C. A., Tsitsas, N. L. & Sihvola, A. H., Sep 19 2016, 2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016. Institute of Electrical and Electronics Engineers Inc., p. 783-786 4 p. 7571519

Research output: Chapter in Book/Report/Conference proceedingConference contribution

inclusions
radar antennas
Radar antennas
ground penetrating radar
Antenna grounds

Conjugately-matched uniaxial metamaterials make extremely efficient absorbers, emitters, and reflectors

Valagiannopoulos, C. A., Simovski, C. R. & Tretyakov, S. A., Nov 16 2016, 2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2016. Institute of Electrical and Electronics Engineers Inc., p. 379-381 3 p. 7746406

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Photonic devices
Metamaterials
Electromagnetic waves
reflectors
absorbers
1 Citation (Scopus)

Guessing the texture of magnetic samples assisted by Aharonov-Bohm effect

Valagiannopoulos, C. A., Alù, A., Dimakis, A. & Marengo, E. A., May 31 2016, 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. Institute of Electrical and Electronics Engineers Inc., 7481443

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Magnetic permeability
Wave functions
Electron beams
textures
Textures

Radiation-enhancing reflector

Valagiannopoulos, C. A. & Tretyakov, S. A., May 31 2016, 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. Institute of Electrical and Electronics Engineers Inc., 7481933

Research output: Chapter in Book/Report/Conference proceedingConference contribution

reflectors
Radiation
radiation
Evanescent fields
Antenna reflectors
2015

Aberration-free planar focusing based on parity-time symmetric nonlocal metamaterials

Monticone, F., Alu, A. & Valagiannopoulos, C. A., Oct 22 2015, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). Institute of Electrical and Electronics Engineers Inc., Vol. 2015-October. p. 252-253 2 p. 7304512

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Metamaterials
Aberrations
Lenses
Imaging techniques
Refraction

Amplifying the response of a buried object by depositing a passive layer on the ground

Valagiannopoulos, C. A., Tsitsas, N. L. & Sihvola, A. H., Sep 2 2015, 2015 Computational Electromagnetics International Workshop, CEM 2015. Institute of Electrical and Electronics Engineers Inc., p. 28-29 2 p. 7237424

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Inclusion
Detectability
Numerical Results
Configuration
Line

Blacker than ideally black: Double negative conjugately matched cylinders

Vehmas, J., Valagiannopoulos, C., Tretyakov, S. & Maslovski, S., Nov 30 2015, 2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2015. Institute of Electrical and Electronics Engineers Inc., p. 511-513 3 p. 7342506

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Metamaterials

Cloaking a bump inside a single isotropic lossless dielectric

Valagiannopoulos, C. A., Tsitsas, N. L. & Sihvola, A. H., Aug 27 2015, 2015 9th European Conference on Antennas and Propagation, EuCAP 2015. Institute of Electrical and Electronics Engineers Inc., 7228455

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Integral equations
Permittivity
conduction
wave reflection
far fields
2 Citations (Scopus)

Excitation of a grounded lossy dielectric slab by an external complex source point beam

Tsitsas, N. L. & Valagiannopoulos, C. A., Aug 27 2015, 2015 9th European Conference on Antennas and Propagation, EuCAP 2015. Institute of Electrical and Electronics Engineers Inc., 7228895

Research output: Chapter in Book/Report/Conference proceedingConference contribution

point sources
Boundary value problems
Fourier transforms
slabs
Scattering

PT-symmetric metamaterial systems for aberration-free imaging and wave manipulation

Monticone, F., Valagiannopoulos, C., Savoia, S., Fleury, R. & Alu, A., Nov 30 2015, 2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2015. Institute of Electrical and Electronics Engineers Inc., p. 223-225 3 p. 7342581

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Metamaterials
Aberrations
Lenses
Optical instruments
Imaging techniques
2013
1 Citation (Scopus)

A grating from coated PEC cylinders functioning as an electromagnetic absorber

Valagiannopoulos, C. A. & Tretyakov, S. A., 2013, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 1986-1987 2 p. 6711651

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electromagnetic waves
Boundary value problems
2 Citations (Scopus)

Approximating the mechanism of perfect electromagnetic boundaries by using magneto-dielectric materials

Valagiannopoulos, C. A. & Sihvola, A. H., 2013, Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013. p. 1036-1039 4 p. 6632400

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric conductors
Boundary value problems
Scattering

Computationally efficient optimization of coupling tapers for transmission-line networks under obliquely incident illumination

Valagiannopoulos, C. A. & Alitalo, P., 2013, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 420-421 2 p. 6710871

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric lines
Lighting
Computer simulation

Concealing a perfectly conducting object with edges inside a dielectric superstrate

Valagiannopoulos, C. A. & Tsitsas, N. L., 2013, Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013. p. 1269-1272 4 p. 6632451

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Integral equations
Permittivity
Scattering
Computer simulation

Low interaction of an arbitrarily large PEC cylinder with em waves filtered through a layered structure

Valagiannopoulos, C. A., 2013, 2013 7th European Conference on Antennas and Propagation, EuCAP 2013. p. 2238-2242 5 p. 6546689

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Circular cylinders
Electromagnetic waves
Electromagnetic fields
Lighting

On enhancing the field in the vicinity of a metamaterial wedge with use of an auxiliary dielectric tip

Valagiannopoulos, C. A. & Sihvola, A., 2013, 2013 7th European Conference on Antennas and Propagation, EuCAP 2013. p. 3452-3456 5 p. 6546951

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nanotips
Metamaterials
Electromagnetic fields
Electrostatics
Permittivity
8 Citations (Scopus)

Optimal directional pattern design utilizing arbitrary microphone arrays: A continuous-wave approach

Delikaris-Manias, S., Valagiannopoulos, C. A. & Pulkki, V., 2013, 134th Audio Engineering Society Convention 2013. p. 1-10 10 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

microphones
continuous radiation
decomposition
audio signals
Fourier series
2012
1 Citation (Scopus)

A Cartesian cloaking comprised of gradually sparser dielectric layers exploiting Snell's law

Valagiannopoulos, C. A., 2012, Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012. p. 2688-2692 5 p. 6206412

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electromagnetic waves
Electromagnetic fields

Cloaking a microstrip antenna: Integral equation modeling

Valagiannopoulos, C. A. & Tsitsas, N. L., 2012, Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications, ICEAA'12. p. 383-386 4 p. 6328654

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microstrip antennas
Integral equations
Antennas
Receiving antennas
Metamaterials
2 Citations (Scopus)

Concentrating the electromagnetic power in a grounded dielectric slab excited by an external Gaussian beam

Tsitsas, N. L. & Valagiannopoulos, C. A., 2012, International Conference on Mathematical Methods in Electromagnetic Theory, MMET. p. 304-307 4 p. 6331251

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gaussian Beam
Gaussian beams
Dielectric films
concentrating
slabs
2 Citations (Scopus)

Dielectric-coated PEC cylinders which do not scatter electromagnetic waves

Valagiannopoulos, C. A., Alitalo, P. & Tretyakov, S., 2012, Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications, ICEAA'12. p. 90-91 2 p. 6328595

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Magnetic moments
Electromagnetic waves
Scattering

Efficient evaluation of the Green's function for a bended coplanar waveguide

Valagiannopoulos, C. A., 2012, Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012. p. 2191-2195 5 p. 6206304

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Coplanar waveguides
Green's function
Waveguides
Boundary conditions

Electromagnetic cloaking of PEC cylinders with a single isotropic and homogeneous layer

Valagiannopoulos, C. A. & Alitalo, P., 2012, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 6348712

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Anisotropy
Permittivity
Scattering
1 Citation (Scopus)

The influence of refractive index, excitation and observation on PEC/PMC boundary realization

Valagiannopoulos, C. A. & Sihvola, A. H., 2012, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 6348494

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Refractive index
2011
4 Citations (Scopus)

Analytical model for coupling of waves between a homogeneous medium and a volumetric transmission-line network

Valagiannopoulos, C. A., Alitalo, P. & Tretyakov, S. A., 2011, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 2597-2600 4 p. 5997056

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Analytical models
Electric lines
Metamaterials
Periodic structures
Refraction
6 Citations (Scopus)

Conversion of evanescent waves into propagating modes by passing through a metamaterial prism: An iterative approximation method

Valagiannopoulos, C. A. & Simovski, C. R., 2011, Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. p. 95-99 5 p. 5782599

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Evanescent fields
Metamaterials
Prisms
5 Citations (Scopus)

On adjusting the characteristics of a low-index slab antenna with a finite set of metallic pins

Valagiannopoulos, C. A., 2011, Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. p. 913-917 5 p. 5782588

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Metamaterials
Radiators
Boundary value problems
Antennas
Substrates
12 Citations (Scopus)

Simple cloak for antenna blockage reduction

Alitalo, P., Valagiannopoulos, C. A. & Tretyakov, S. A., 2011, IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 669-672 4 p. 5996800

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Horn antennas
Antennas
Computer simulation
2010

Convergence and oscillations in method-of-auxiliary-sources analyses of dielectric scattering problems

Valagiannopoulos, C. A., Tsitsas, N. L. & Fikioris, G., 2010, Proceedings - 2010 12th International Conference on Electromagnetics in Advanced Applications, ICEAA'10. p. 665-668 4 p. 5651472

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric conductors
Scattering

Electromagnetic wave scattering by quasi-homogeneous obstacles

Tsitsas, N. L. & Valagiannopoulos, C. A., 2010, Proceedings of the 9th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering: Advanced Topics in Scattering and Biomedical Engineering. World Scientific Publishing Co. Pte Ltd, p. 169-176 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electromagnetic wave scattering
Far-field Pattern
Wave Scattering
Electromagnetic Scattering
Electromagnetic Wave
2008

Complex resonant frequencies of multi-layered spherical microstrip antennas

Valagiannopoulos, C. A. & Tsitsas, N. L., 2008, Mathematical Methods in Electromagnetic Theory, MMET, Conference Proceedings. p. 213-215 3 p. 4580943

Research output: Chapter in Book/Report/Conference proceedingConference contribution

spherical antennas
microstrip antennas
matrix methods
resonant frequencies
methodology
2004
1 Citation (Scopus)

On choosing kernel and feed when analyzing dipole antennas via integral equations

Valagiannopoulos, C. A. & Fikioris, G., 2004, Mathematical Methods in Electromagnetic Theory, MMET, Conference Proceedings. p. 257-259 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

dipole antennas
electrical impedance
integral equations
function generators
delta function