Prohlížení Publikační činnost - 13117 dle názvu

Zobrazují se záznamy 47-58 z 58

    • Stability of FDTD in Curvilinear Coordinates 

      Autor: Pauk, Lukáš; Škvor, Zbyněk
      (IEEE, 2001-07)
      A new approach suitable for determination of the maximal stable time step for the finite-difference time domain (FDTD) algorithm in curvilinear coordinates is presented. It is based on a modified variable separation method, ...

    • Static model of DH laser 

      Autor: Macháč, J.
      (IEEE, 1983-04)
      A method of complex analysis of the double-heterostructure stripe-geometry laser, based on a new static model, is presented. The optical field distribution in the active region of the laser is described by the wave equation. ...

    • Surface leaky waves and their measurement 

      Autor: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan; Sarnowski, Marcin K.; Polívka, Jiří
      (IEEE, 1998-10)
      A new approach to experimental identification of surface leaky waves on printed-circuit lines is presented in this paper. Active radiometry is used for field probing even in the near field zone. The measurement is adjusted ...

    • The Distributed Oscillator at 4 GHz 

      Autor: Divina, Lukáš; Škvor, Zbyněk
      (IEEE, 1998-12)
      This paper describes the design and experimental verification of a tunable oscillator based on a microwave distributed amplifier. The oscillator met design expectations, being capable of continuous tuning over the range ...

    • The Inverted Conductor-Backed Slotline - a Challenge to Antenna and Circuit Design 

      Autor: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan; Tuzi, Carlo
      (IEEE, 2003-10)
      The characteristics of modes on the conductor-backed slotline, the inverted conductor-backed slotline and on its modification in which the top dielectric layer with higher permittivity has a finite thickness, are presented ...

    • Triple Wire Medium for Use in Isotropic Metamaterials 

      Autor: Hudlička, Martin; Macháč, Jan
      (IEEE, 2007-10)
      In this paper a triple wire medium is described as an isotropic negative permittivity medium. A numerical experiment was performed to validate the propagation of electromagnetic waves inside the wire lattice below the ...

    • Upper Cut-Off Frequency of the Bound Wave and New Leaky Wave on the Slotline 

      Autor: Zehentner, Ján; Macháč, Jan; Migliozzi, Maurizio
      (IEEE, 1997-06)
      This paper contributes to a more profound understanding of uniplanar circuit behaviour. A simple closed-form formula providing the upper cut-off frequency of the bound wave propagating over the slotline is presented. A new ...

    • Use of Nano-Grids in a Waveguide 

      Autor: Zehentner, Ján; Macháč, Jan; Zabloudil, Pavel
      (IEEE, 2006-09)
      A new concept of passive waveguide circuits is presented. It is based on a combination of the standard rectangular waveguide with a metal uniform linear polarization grid of nano thickness. The grid is deposited on a polymer ...

    • Visualization of leaky waves on planar transmission lines 

      Autor: Macháč, Jan; Zehentner, Ján; Mrkvica, Jan
      (IEEE, 2004-05)
      This paper presents a visualization of leaky waves excited by delta-gap sources on planar transmission lines, namely the 2nd surface and space leaky modes on the slotline, and the dominant and surface leaky modes on the ...

    • Waveguide bandpass filters with attenuation of higher-order passbands 

      Autor: Menzel, Wolfgang; Macháč, Jan
      (IEEE, 1993-09)
      A new method is proposed to provide additional attenuation to higher-order passbands of metal waveguide bandpass filters. To this end, shunt waveguide sections with cut-off frequencies are included into the filter structure. ...

    • Wide-Slotted Printed Slotline Radiator 

      Autor: Macháč, Jan; Zehentner, Ján; Lorenz, Petr; Mrkvica, Jan
      (IEEE, 2002)
      This paper summarizes the investigation of radiation from the slotline made on a thin low permittivity substrate. The slot radiates the space leaky wave of the first order. The dispersion characteristic of this wave is ...

    • Wideband VIP power divider with differential output 

      Autor: Sokol, V.; Hoffmann, K.; Škvor, Z.
      (IEEE, 2003-12)
      A novel wideband VIP power divider with out of phase outputs was designed and experimentally verified. The phase difference 180° ±5° and the amplitude difference ± 0.8 dB of output signals were achieved in 4-26 GHz frequency ...