Now showing items 1-11 of 11

  • Design of Primary Feeds for 32m KDDI Antenna System IBA-4 in Cassegrain Configuration 

    Galuscak, R.; Watanabe, M.; Hazdra, P.; Takeda, S.; Seki, K.; Prochazka, M.; Uchiyama, Y. (Společnost pro radioelektronické inženýrství, 2008-04)
    Physically large dimensional dish antennas in Cassegrain configuration have played an important role in satellite communications during the past several decades. Recently, however, emerging new technologies have begun to ...
  • Dual-band Loop Feed with Enhanced Performance 

    Galuscak, R.; Hazdra, P. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper is aimed on specific problems of electrically small and deep dish parabolic antennas. Since these antennas may suffer with low efficiency authors describe design and optimization of simple dual-band loop prime-focus ...
  • Evaluation of the Input Impedance and Impedance Quality Factor of a Dipole in Spatial and Spectral Domains 

    Cerveny, M.; Hazdra, P. (Společnost pro radioelektronické inženýrství, 2017-12)
    In classic antenna analysis, there exist several methods of calculating input impedance when the source distribution of an antenna is known. The well-known induced EMF method, based on spatially distributed currents, is ...
  • Excitation of a Conducting Cylinder Using the Theory of Characteristic Modes 

    Pascawati, A.; Hazdra, P.; Lonsky, T.; Aziz, M. R. K. (Společnost pro radioelektronické inženýrství, 2018-12)
    This paper describes the application of the theory of characteristic modes to excite a conducting cylinder representing the chassis of a rocket. Mode excitation is achieved by cutting H-shaped slots on the cylinder at ...
  • An Introduction to the Source Concept for Antennas 

    Hazdra, P.; Capek, M.; Masek, M.; T. Lonsky (Společnost pro radioelektronické inženýrství, 2016-04)
    Antenna parameters particularly relevant to electrically small antenna design are reviewed in this paper. Source current definitions are accentuated leading to the introduction of the source concept which advantageously ...
  • L-System Tool for Generating Fractal Antenna Structures with Ability to Export into EM Simulators 

    Hazdra, P.; Mazanek, M. (Společnost pro radioelektronické inženýrství, 2006-06)
    An L-System (Lindenmayer system) is a scheme primarily developed in the area of the computer science for simulating the development of biological structures. It has also been found very useful for generating the geometry ...
  • Microwave Antennas and Circuits Modeling Using Electromagnetic Field Simulator 

    Hazdra, P.; Polivka, M.; Sokol, V. (Společnost pro radioelektronické inženýrství, 2005-12)
    Electromagnetic field simulators have become a widely used tool in a design process of microwave circuits and systems. A proper usage of electromagnetic (EM) field simulators allows substantial reduction of the design time ...
  • On the Modal Superposition Lying under the MoM Matrix Equations 

    Hazdra, P.; Hamouz, P. (Společnost pro radioelektronické inženýrství, 2008-09)
    This paper shows an interesting sight on the correspondence between total current solution obtained by the Method of Moments and by the Characteristic modes respectively. Derivation is based on representation of a matrix ...
  • TCAD - A Progressive Tool for Engineers 

    Vobecky, J.; Voves, J.; Hazdra, P.; Adamcik, I. (Společnost pro radioelektronické inženýrství, 1993-04)
    The semiconductor industry is continuously striving to improve the performance of electron devices and circuits. It implies the need for better understanding of their basic behaviour. However, the miniaturization and ...
  • Two-Element PIFA Array Structure for Polarization Diversity in UMTS Mobile Phones 

    Ferrero, F.; Diallo, A.; Luxey, C.; Derat, B.; Hamouz, P.; Hazdra, P.; Rahola, J. (Společnost pro radioelektronické inženýrství, 2009-12)
    In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS handset by using a phased two-element PIFA array. The structure is composed of a 100x40 mm2 metallic ground plane acting as the ...
  • Wideband Rectangular Microstrip Patch Antenna Using L-Probe Feeding System 

    Hazdra, P.; Mazanek, M.; Cermak, J. (Společnost pro radioelektronické inženýrství, 2007-09)
    Paper focuses on so-called L-probe feeding technique suitable for wideband (30% relative bandwidth) driving of microstrip patch antennas. Physical explanation, simulation and measurement are presented. Further modification ...