Now showing items 1-16 of 16

  • Analysis of Periodic Errors for Synthesized-Reference-Wave Holography 

    Pidanic, J.; Schejbal, V.; Cermak, D. (Společnost pro radioelektronické inženýrství, 2009-12)
    Synthesized-reference-wave holographic techniques offer relatively simple and cost-effective measurement of antenna radiation characteristics and reconstruction of complex aperture fields using near-field intensity-pattern ...
  • Bistatic and Multistatic Radar Systems 

    Bezousek, P.; Schejbal, V. (Společnost pro radioelektronické inženýrství, 2008-09)
    Radar systems, based on bistatic radar concept attracted a substantial attention in the recent years. Passive coherent location systems using \"transmitters of opportunity\" like radio or TV broadcasters, GSM base stations, ...
  • Broadband Approximations for Doubly Curved Reflector Antenna 

    Schejbal, V.; Pidanic, J. (Společnost pro radioelektronické inženýrství, 2010-12)
    The broadband approximations for shaped-beam doubly curved reflector antennas with primary feed (rectangular horn) producing uniform amplitude and phase aperture distribution are derived and analyzed. They are very valuable ...
  • CAD of Rectangular Microstrip Antennas 

    Schejbal, V. (Společnost pro radioelektronické inženýrství, 1999-09)
    New simple computer-aided design formulas for the rectangular microstrip patch antennas have been developed. The cavity model is used but the more accurate models for open-end effect of microstrip lines and the effective ...
  • Comparison of CAD for Rectangular Microstrip Antennas 

    Schejbal, V.; Novak, J.; Gregora, S. (Společnost pro radioelektronické inženýrství, 2003-04)
    Calculations of several cases for rectangular microstrip antennas using more accurate cavity model have been compared with the conventional cavity calculations, expressions generated by curve fitting to full wave solutions ...
  • Comparison of CAD Formulas, Method of Moments and Experiments for Rectangular Microstrip Antennas 

    Schejbal, V.; Raida, Zbyněk; Novacek, Z. (Společnost pro radioelektronické inženýrství, 2003-04)
    Calculations of several cases for rectangular microstrip patch antennas using more accurate cavity model have been compared with the conventional cavity calculations, expressions generated by curve fitting to full wave ...
  • Comparison of Propagation over Irregular Terrain 

    Schejbal, V. (Společnost pro radioelektronické inženýrství, 1997-09)
    Various cases of electromagnetic wave propagation have been solved such as two obstacles with the sharp edges or the spherical earth especially for low altitude propagation considering several combinations of antenna and ...
  • Gain Estimation of Doubly Curved Reflector Antenna 

    Pidanic, J.; Cermak, D.; Schejbal, V. (Společnost pro radioelektronické inženýrství, 2008-09)
    A simple formula of approximate gain estimation is verified for the doubly curved reflector antenna. Numerical simulations using physical optics and experimental results of the shaped-beam doubly curved reflector antenna ...
  • Improved Analysis of Propagation over Irregular Terrain 

    Schejbal, V. (Společnost pro radioelektronické inženýrství, 2009-04)
    An improved analysis of propagation over irregular terrain using physical optics approximation of vector problem is presented. It offers more reliable numerical simulations for low altitude propagation and diffraction field ...
  • Modeling of 830 nm FSO Link Attenuation in Fog or Wind Turbulence 

    Pesek, J.; Fiser, O.; Svoboda, J.; Schejbal, V. (Společnost pro radioelektronické inženýrství, 2010-06)
    This study is focused on the experimental research of the atmosphere impact on FSO link attenuation. Experiment is performed on a mountain observatory Milesovka of severe weather conditions. The empirical relationships on ...
  • Multipath Propagation of UWB Through-Wall Radar and EMC Phenomena 

    Schejbal, V.; Cermak, D.; Nemec, Z.; Pidanic, J.; Konecny, J.; Bezousek, P.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2006-12)
    The UWB (ultra wide band) radar output signals can be substantially affected due to electromagnetic wave propagation through obstacles (such as walls) and multipath effects, too. Multipath effects are analyzed and simulated ...
  • Optimization of Far-Field Antenna Range 

    Cerny, O.; Dolecek, R.; Kopecky, P.; Schejbal, V.; Zavodny, V. (Společnost pro radioelektronické inženýrství, 2015-12)
    Measurements of test antennas are performed on antenna ranges. The operated microwave far-field outdoor range was built-up in 1970’s and therefore it was not appropriate for the today measurements. Thus, it was decided to ...
  • Propagation over Irregular Terrain 

    Schejbal, V. (Společnost pro radioelektronické inženýrství, 1997-04)
    The computer model and computation accuracy for propagation over irregular terrain are presented. Special attention is paid to computation for low altitude propagation and the finite distance between the antenna and the ...
  • Tropospheric Propagation above Uneven Ground 

    Schejbal, V.; Zavodny, V. (Společnost pro radioelektronické inženýrství, 2017-12)
    This work analyzes the electromagnetic wave propagation above uneven ground, including the troposphere, using physical optics calculation. The new results of numerical simulations using physical optics are presented for ...
  • Two-Dimensional Forward Scattering – Comparisons of Approximate and Exact Solutions 

    Schejbal, V.; Svoboda, P.; Pidanic, J.; Fiser, O. (Společnost pro radioelektronické inženýrství, 2012-04)
    Various methods for analyses of scattering are mentioned and new approximate relationships are derived. Experimental results for thin wire and several numerical simulations of forward scattering using approximate estimations, ...
  • UWB Propagation through Walls 

    Schejbal, V.; Bezousek, P.; Cermak, D.; Nemec, Z.; Fiser, O.; Hajek, M. (Společnost pro radioelektronické inženýrství, 2006-04)
    The propagation of ultra wide band (UWB) signals through walls is analyzed. For this propagation studies, it is necessary to consider not only propagation at a single frequency but in the whole band. The UWB radar output ...