Now showing items 21-40 of 58

    • Space Leakage of Power from the Slotline 

      Author: Zehentner, Ján; Macháč, Jan; Lorenz, Petr
      (IEEE, 2001)
      In this paper we present the comprehensive dispersion characteristics of the slotline on thin and low permittivity substrate with a wide slotwidth comprising the bound and space leaky waves with even and odd electric field ...
    • Active Resonator 

      Author: Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2001-07)
      A new electrical component-active resonator-is designed. The component consists of a common passive resonant circuit whose losses are compensated by an extra active circuit. Experimental verification was done with a TE/sub ...
    • Stability of FDTD in Curvilinear Coordinates 

      Author: 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, ...
    • Planar Slot-Patch Antenna 

      Author: Zehentner, Ján; Macháč, Jan; Lorenz, Petr; Mrkvica, Jan
      (IEEE, 2001-09)
      This paper discusses investigations of leaky wave radiation from the slotline made on a low permittivity substrate. New findings on the field distribution of the space leaky wave propagating on a slotline with a wide slot ...
    • Novel Selected Modes on the Conductor - Backed Slotline 

      Author: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan
      (IEEE, 2002)
      This paper presents a detailed full-wave analysis of the conductor-backed slotline. The occurrence of an even dominant mode is revealed. This mode may propagate alone from dc up to the frequency at which the first leaky ...
    • Wide-Slotted Printed Slotline Radiator 

      Author: 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 ...
    • Comments on Representation of Surface Leaky Waves on Uniplanar Transmission Lines 

      Author: Macháč, Jan; Zehentner, Ján
      (IEEE, 2002-02)
      This paper compares partial waves approximating a surface leaky wave on a uniplanar transmission line with substrate surface waves supported by its substrate. It is shown that their field distributions and the propagation ...
    • Even and Odd Modes on a Conductor-Backed Slotline 

      Author: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan
      (IEEE, 2002-09)
    • Modes on the Standard and Inverted Conductor-Backed Slotline 

      Author: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan; Tuzi, Carlo
      (IEEE, 2003-06)
      This paper recalls modes which can propagate on the conductor-backed slotline. The characteristic of the dominant mode on the CBSL is documented. The ICBSL is a modification of the CBSL placed in a dielectric with permittivity ...
    • The Inverted Conductor-Backed Slotline - a Challenge to Antenna and Circuit Design 

      Author: 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 ...
    • On radio interference filter measurement 

      Author: Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2003-12)
      A new measurement method for on site testing of multiport radio interference filters (RIF) on shielded chamber is designed. The method is based on scalar measurement only and makes possible a pessimistic estimate of the ...
    • Wideband VIP power divider with differential output 

      Author: 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 ...
    • Visualization of leaky waves on planar transmission lines 

      Author: 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 ...
    • Dispersion Characteristics of the Dominant Mode on a Completely Shielded Conductor-Backed Slotline 

      Author: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan
      (IEEE, 2004-06)
      This paper presents an analysis of a completely shielded conductor-backed slotline using the spectral domain technique. Attention is paid to dominant and higher order modes with even symmetry of the transversal electric ...
    • First results of microwave measurement of broadband radio interference filters 

      Author: Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2004-12)
      A vector measurement method for testing multiport interference filters for shielded chambers has been used. Measured data up to 3 GHz are presented. The authors believe that this is the first time such results have been published.
    • A New Concept of PTP Vector Network Analyzer 

      Author: Závodný, Vadim; Hoffmann, Karel; Škvor, Zbyněk
      (IEEE, 2004-12)
      A new concept for vector network analyzers design based on a perturbation two-port (PTP) is presented. The approach uses redundant states of the PTP. The best states of the PTP for a certain place in Smith chart and frequency ...
    • Flat Waveguide with a Longitudinal Slot 

      Author: Zehentner, Ján; Mrkvica, Jan; Macháč, Jan
      (IEEE, 2005-06)
      This paper presents an analysis of a flat slotted waveguide by the spectral domain method finalized by a complex root search procedure. Matching of fields from bounded and unbounded regions at the common interface is ...
    • Left-Handed Coplanar Waveguide 

      Author: Macháč, Jan; Hudlička, Martin; Zehentner, Ján; Spiliotis, Nikolaos G.; Omar, Abbas S.
      (IEEE, 2005-06)
      This paper proposes a new version of a left-handed coplanar waveguide. The line has a fully uniplanar structure without vias and lumped elements. The series capacitors are represented by interdigital capacitors and the ...
    • Planar Transmission Lines in MW and MMW Circuits 

      Author: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan
      (IEEE, 2005-09)
      The analysis of open, particularly slotted planar transmission lines in a wide frequency range is presented in this paper. The full wave approach by the spectral domain method is applied. Theoretical findings and their ...
    • Coplanar Waveguide Transmitting a Left-Handed Wave 

      Author: Macháč, Jan; Hudlička, Martin; Zehentner, Ján; Spiliotis, Nikolaos G.; Omar, Abbas S.
      (IEEE, 2005-10)
      This paper presents a new version of a coplanar waveguide that transmits a left-handed wave. The equivalent circuit of the line unit cell has been derived from the shape of the layout. The values of its elements were ...