Theory of Electromagnetic Field

Department of Electromagnetic Field
Technická 2, 166 27 Praha 6
tel. 224352279,

Who we are?

We are a research group engaged in basic research of transmission lines and in metamaterials, as well as in applications such as development of new planar antennas. We also work on the propagation of UWB signals and UWB pulse generators.

Jan Macháč
He is a leader of the research team. He deals with the design and modeling of electromagnetic fields and his main interest is in the area of metamaterials, planar lines and antennas.

Lukáš Jelínek
He deals with the general solution of electromagnetic fields, mainly in the area of metamaterials. He designs new types of metamaterial particles.

Vítězslav Pankrác
His main research interests are in the solution of electromagnetic problems in electrical power engineering, namely with the modeling and design of high-power electrical apparatus such as power transformers and reactors.

Michal Bláha
He deals with design and modeling of metamaterials. His main interest is in coupling of single metamaterial particles and their frequency tuning.

Václav Kotlan
He deals with a mathematical analysis and modeling of open planar transmission lines. His main interest is in a wave excitation on these lines.

Pavel Protiva
He deals with the solution of electromagnetic fields in the time domain, mainly with applications of UWB signals, design of appropriate generators and signal processing.

Vít Bečvář
He deals with the design of passive and active metamaterials. His main interest is in coupling of single metamaterial particles and their frequency tuning. He also participates in research of active particles.

Which kind of research we are doing

We deal with applications and research in the field of RF and microwave technology. Using mathematical analysis and numerical simulations we solve electromagnetic fields and the propagation of signals in the environment. The aim is to expand scientific knowledge in the field of microwave transmission lines, metamaterials and processing of UWB signals. We also deal with own realization of RF and microwave circuits, metamaterial particles and transmitting and receiving devices for UWB.

What is it good for

Metamaterials are artificial materials (usually composite), which does not occur spontaneously in nature. The difference from any other materials is in negative permittivity or permeability. Thus metamaterials can have a negative refractive index. This can be used to produce lenses without having to grind. Metamaterials can be used to guide electromagnetic waves at specific frequency around the object and cause its apparent "invisibility." UWB signals can be successfully used for the propagation through various materials and using reflection to detect objects invisible to the human eye - it is possible to "see" behind the wall. Basic research on planar microwave transmission lines is necessary for their further applications in microwave circuits. Our working group participates to expand general knowledge about the open planar transmission lines.

What we are working on

We are working on frequency-tunable metamaterial particles. We also study a cupling between several interacting particles. Our designed metamaterial particles are directly manufactured and tested by measuring their parameters.

In the area of broadband UWB signals we are working on the possibility of detecting people behind the walls of any kind, including its exact location. It is necessary to design special UWB pulse generators and detectors, which are also the output of our working group.

In the area of open planar transmission lines we focus on analysis of slotline-type lines. We solve the problem of modes excitation along the lines.

Who founds our research

Our research is granted:

  • GAČR 102/09/0314 - "Investigation of Metamaterials an Microwave Structures with the Help of Noise Spectroscopy and Magnetic Resonance"
  • GAČR 102/08/H018 - "Modelling and Simulation of Fields"
  • Research Plan MSM6840770014 - "Research in the Area of the Prospective Information and Navigation Technologies"

Cooperation

  • University of Magdeburg, Germany
  • University of Seville, Spain
  • FEKT VUT Brno
  • ÚPT AV ČR Brno
  • Retia, a.s. Pardubice

Selected Publications

Impacted Journal papers in 2010:
  • . M. Lapine, L. Jelinek, R. Marques, and M. J. Freire: "Exact modelling method for discrete finite metamaterial lens", IET Microwaves, Antennas & Propagation, Vol. 4, pp. 1132.1139, 2010
  • . L. Jelinek, R. Marques: "Artifcial magnetism and left handed media from dielectric rings and rods", J. Phys.: Condens. Matter, Vol. 22, pp. 025902, 2010
  • . V. Delgado, R. Marques, L. Jelinek: "Analytical theory of extraordinary optical transmission through realistic metallic screens", Optics Express, Vol. 18, pp. 6506-6515, 2010
  • . M. J. Freire, L. Jelinek, R. Marques, M. Lapine: "On the applications of mir=-1 metamaterial lenses for magnetic resonance imaging", Journal of Magnetic Resonance, Vol. 203, pp. 81.90, 2010
  • . L. Jelinek, R. Marques, J. Machac: "Fishnet Metamaterials - Rules for refraction and limits of homogenization", Optics Express, Vol. 18, pp. 17940-17949, 2010
  • . M. Lapine, L. Jelinek, M. J. Freire, R. Marques: "Realistic metamaterial lenses: Limitations imposed by discrete structure", Physical Review B, Vol. 82, pp. 165124, 2010
  • . P. Protiva, J. Mrkvica, J. Machac: "Ultra-Wideband Pulse Waveform Generation Based on Combining Subnanosecond Gaussian Pulses", Microwave and ptical Technology Letters, Vol. 52, No. 11, pp. 2401-2405 November 2010
  • . P. Protiva, J. Mrkvica, J. Machac: "A Compact Step Recovery Diode Subnanosecond Pulse Gnerator", Microwave and Optical Technology Letters, Vol. 52, No. 2, pp. 438-440, February 2010
  • . V. Kotlan, F. Mesa, J. Machac: "Numerical and Experimental Study of the Voltage Excited Along a Slotline by a Current Source", Radio Science, 45, RS1004, January 2010
  • . V. Kotlan, J. Machac: "High-frequency Crosstalk Between Two Parallel Slotlines", IET Microwaves, Antennas & Propagation, Volume 4, Issue 12, p.2240.2246, December 2010