Prohlížení Publikační činnost - 13117 dle autora "Macháč, Jan"
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A Double H-Shaped Resonator for an Isotropic ENG Metamaterial
Autor: Macháč, Jan; Rytíř, Martin; Protiva, Pavel; Zehentner, Jan
(IEEE, 2008-10)This paper presents a new planar particle showing negative effective permittivity under irradiation by an electromagnetic wave. The response of this particle, aimed to be sensitive to an electric field, is strongly ... -
A Simple Ultra-Wideband Suspended Stripline Bandpass Filter With Very Wide Stop-Band
Autor: Balalem, Atallah; Menzel, Wolfgang; Macháč, Jan; Omar, Abbas
(IEEE, 2008-03)This letter introduces a simple ultra-wideband suspended stripline filter with a pass-band from 3.1 to 10.6 GHz and a very wide stop-band up to more than 25 GHz. The filter is realized by capacitive coupling of a quasi-lumped ... -
Bandpass Filters on a Modified Multilayer Coplanar Line
Autor: Balalem, Atallah; Hamad, Ehab K. I.; Macháč, Jan; Omar, Abbas S.
(IEEE, 2006-06)The design of compact multilayer coplanar line bandpass filters is presented. These very compact filters make use of the two sides of the substrate of the modified coplanar line. In addition, a transmission zero has been ... -
Comments on Representation of Surface Leaky Waves on Uniplanar Transmission Lines
Autor: 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 ... -
Coplanar Waveguide Transmitting a Left-Handed Wave
Autor: 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 ... -
Dispersion characteristics of leaky waves on lossless and lossy slotlines
Autor: Zehentner, Ján; Macháč, Jan; Migliozzi, Maurizio
(IEEE, 1998-06)This paper deals with the dependence of the type of solution of the determinantal slotline dispersion equation on the location of the poles of its matrix elements. A number of possible solutions above the cut-off frequencies ... -
Dispersion Characteristics of the Dominant Mode on a Completely Shielded Conductor-Backed Slotline
Autor: 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 ... -
Even and Odd Modes on a Conductor-Backed Slotline
Autor: Zehentner, Ján; Macháč, Jan; Mrkvica, Jan
(IEEE, 2002-09) -
Flat Waveguide with a Longitudinal Slot
Autor: 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 ... -
Isotropic Epsilon-Negative Particles
Autor: Macháč, Jan; Protiva, Pavel; Zehentner, Ján
(IEEE, 2007-06)This paper presents two particles with negative permittivity in some frequency band. The response of a single dipole loaded by an inductance is strongly anisotropic. The response of a spider dipole does not depend on the ... -
Leakage Effects of Dominant and Higher Order Modes on Slotline
Autor: Macháč, Jan; Zehentner, Jan
(IEEE, 1996-09)The properties of the slotline when the dominant bound or leaky wave propagates, together with the behaviour of new higher order modes are investigated. The frequency range in which the slotline transmits the bound wave ... -
Leaky Wave Radiation of a Printed Slotline Antenna
Autor: Zehentner, Ján; Macháč, Jan; Lorenz, Petr; Mrkvica, Jan
(IEEE, 2001)This paper presents a theoretical prediction of the field radiated from a uniplanar slotline antenna operating with the leaky wave. Discussion on a possible spectrum of space leaky waves is opened. Several antennas and ... -
Left-Handed Coplanar Waveguide
Autor: 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 ... -
Low Profile Slotted Flat Waveguide Leaky Wave Antenna
Autor: Zehentner, Ján; Macháč, Jan; Zabloudil, Pavel
(IEEE, 2006-06)This paper presents the application of a flat waveguide with a longitudinal slot in the middle of its wider wall for the design of a leaky wave antenna. The antenna radiates into one relatively narrow main beam and its ... -
Microstrip Line on an Artificial Dielectric Substrate
Autor: Macháč, Jan
(IEEE, 2006-07)This letter presents a new version of an artificial dielectric substrate and a microstrip line built on top of this substrate. The substrate is fabricated as a two-dimensional array of metallic posts separated from the top ... -
Microwave reflectivity from gold sputtered nanolayer
Autor: Buchar, Pavel; Macháč, Jan; Zehentner, Ján
(IEEE, 2007-11)This paper deals with reflectivity of a gold layer of nanometer-scale thickness sputtered on a dielectric foil at microwave frequencies. A model of nanometer-scale spheres characterizes the behavior of the layer. For short ... -
Modes on the Standard and Inverted Conductor-Backed Slotline
Autor: 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 ... -
New Bulk Metamaterial
Autor: Macháč, Jan; Buchar, Pavel; Zehentner, Ján; Omar, Abbas S.
(IEEE, 2005-10)The design, analysis, fabrication and measurement of a new bulk metamaterial is reported in this paper. The structure of the new medium is made up of left-handed parallel strips. The series capacitors are realized by short ... -
New Space Leaky Wave Spectrum Components on the Slotline
Autor: Zehentner, Ján; Macháč, Jan
(IEEE, 2000-10)Surface and space leakage of power deteriorates the operation of circuits. On the other hand space leaky waves enable the design of specific radiators. In this paper we therefore investigate the potential of the slotline ... -
Novel Entire Top Surface Planar Leaky Wave Antenna
Autor: Zehentner, Ján; Macháč, Jan; Zabloudil, Pavel
(IEEE, 2007-10)This paper presents the application of a flat waveguide with a longitudinal slot in the middle of its wider wall for the design of a leaky wave antenna. The antenna is fed from a coaxial connector on its bottom, and provides ...