Computational Electromagnetics (CEM)

CEM group concentrates on theoretical research in classical electromagnetic theory. Among the currently developed topics belong radiation properties of electrically small radiators and scatterers and their optimizations. Members of the group have for many years been also involved in classical antenna theory and field propagation in artificial composite materials.

Current research activities are strongly entangled with a “source concept” paradigm, in which all involved field quantities as well as engineering metrics are described solely in terms of electromagnetic sources. The idea of the source concept is sketched in the following figure.

CEM team collaborates with other department’s teams.

Core Members of the Group:


Doctoral Students


Visiting Reseachers

Past Members

      Vit Losenicky
      Michal Masek
Jakub Liska
Jonas Tucek
Vojtech Neuman
Martin Strambach
Lamyae Akrou


  • Virtual Prototyping and Validation of Electromagnetic Systems (2018-2021, TH04010373)
  • Fundamental Bounds on Electromagnetic Radiation and Scattering Phenomena and Associated Realizable Subforms (2019-2021, GA19-06049S)
  • Tools for Synthesis of Antennas and Sensors (2014-2017, TA04010457)
  • Source Concept of Electrically Small Antenna Synthesis  (2015-2017, GA15-10280Y)


Active External Collaborations

  • Brno University of Technology, Czech Republic (Petr Kadlec, Vladimir Sedenka)
  • University of Lund, Sweden (Mats Gustafson, Doruk Tayli, Casimir Ehrenborg)
  • University of Santa Clara, USA (Kurt Schab)
  • KTH Royal Institute of Technology, Sweden (Lars Johnsson)
  • Catholic University of Leuven, Belgium (Guy Vandenbosch)
  • Université Nice Sophia Antipolis (Fabien Ferrero)


Journal Papers (Last Three Years)

Current and Antenna Optimization

  • M. Gustafsson and M. Capek: "Maximum Gain, Effective Area, and Directivity", 2018, eprint arXiv: 1812.07058. [Online]. Available:
  • M. Capek, L. Jelinek, K. Schab, M. Gustafsson, B.L.G. Jonsson, F. Ferrero, and C. Ehrenborg: "Optimal Planar Electric Dipole Antenna", 2018, eprint arXiv: 1808.10755. [Online]. Available:
  • M. Capek, L. Jelinek, and M. Gustafsson: "Shape Synthesis Based on Topology Sensitivity", 2018, eprint arXiv: 1808.02479. [Online]. Available:
  • M. Gustafsson, M. Capek, and K. Schab, "Trade-off Between Antenna Efficiency and Q-Factor", 2017, eprint arXiv: 1802.01476. [Online]. Available:
  • L Jelinek, K. Schab, and M. Capek, "The Radiation Efficiency Cost of Resonance Tuning", IEEE Trans. Antennas Propag, vol. 66, pp. 6716 - 6723, 2018.
  • M. Capek, M. Gustafsson, and K. Schab, "Minimization of antenna quality factor", IEEE Trans. Antennas Propag., vol. 65, pp. 4115 - 4123, 2017.
  • L. Jelinek and M. Capek, "Optimal currents on arbitrarily shaped surfaces," IEEE Trans. Antennas Propag., vol. 65, pp. 329 - 341, 2017.
  • M. Capek and L. Jelinek, "Optimal composition of modal currents for minimal quality factor Q", IEEE Trans. Antennas Propag., vol. 64, pp. 5230 - 5242, 2016.

Characteristic Modes

  • D. Tayli, M. Capek, L. Akrou, V. Losenicky, L. Jelinek, M. Gustafsson, "Accurate and Efficient Evaluation of Characteristic Modes", IEEE Trans. Antennas Propag., vol. 66, pp. 7066 - 7075, 2018.
  • M. Capek, V. Losenicky, L. Jelinek, and M. Gustafsson, "Validating the characteristic modes solvers," IEEE Trans. Antennas Propag., vol. 65, pp. 4134 - 4145, 2017.
  • M. Capek, P. Hazdra, M. Masek, and V. Losenicky, "Analytical representation of characteristic modes decomposition," IEEE Trans. Antennas Propag., vol. 65, pp. 713 - 720, 2017.
  • M. Capek, J. Eichler, and P. Hazdra, "Evaluating radiation efficiency from characteristic currents," IET Microw. Antenna P., vol. 9, pp. 10 - 15, 2015.

Stored Energy and Quality Factor Q

  • K. Schab, L. Jelinek, M. Capek, C. Ehrenborg, D. Tayli, G. A. E. Vandenbosch, M. Gustafsson, "Energy Stored by Radiating Systems," IEEE Access , vol. 6, pp. 10553 - 10568, 2018.
  • K. Schab, L. Jelinek, and M. Capek, "Recoverable energy of dissipative electromagnetic systems," 2017, eprint arXiv: 1701.06313. [Online]. Available:
  • M. Capek and L. Jelinek, "Comments on On Stored Energies and Radiation Q," IEEE Trans. Antennas Propag., vol. 64, pp. 4575 - 4576, 2016.
  • M. Capek, L. Jelinek, and G. A. E. Vandenbosch, "Stored electromagnetic energy and quality factor of radiating structures," Proc. R. Soc. A, vol. 472, pp. 1 - 16, 2016.
  • L. Jelinek, M. Capek, P. Hazdra, and J. Eichler, "An analytical evaluation of the quality factor Qz for dominant spherical modes," IET Microw. Antenna P., vol. 9, no. 10, pp. 1096 - 1103, 2015.
  • M. Capek, L. Jelinek, and P. Hazdra, "On the functional relation between quality factor and fractional bandwidth," IEEE Trans. Antennas Propag., vol. 63, no. 6, pp. 2787 - 2790, 2015.
  • M. Capek and L. Jelinek, "Various interpretations of the stored and the radiated energy density," 2015, eprint arXiv: 1503.06752. [Online]. Available:

Artificial Materials

  • L. Jelinek, O. Kratky, and M. Capek, "An evaluation of polarizability tensors of arbitrarily shaped highly conducting bodies," IET Microw. Antenna P., vol. 11, pp. 852 - 858, 2017.
  • I. Hrebikova, L. Jelinek, and M. G. Silveirinha, "Embedded energy state in an open semiconductor heterostructure," Phys. Rev. B, vol. 92, p. 155303, 2015.

/Edited 19. 12. 2018, MC/