Now showing items 9-22 of 22

  • An Efficient CS-CPWL Based Predistorter 

    Bruno, M.; Cousseau, J.; Werner, S.; Figueroa, J.; Cheong, M.; Wichman, R. (Společnost pro radioelektronické inženýrství, 2009-06)
    We study the performance of Hammerstein predistorters (PD) to model and compensate nonlinear effects produced by a high power amplifier with memory. A novel Hammerstein model is introduced that includes, as the basic static ...
  • Influence of EBG Structures on the Far-Field Pattern of Patch Antennas 

    Horak, J.; Raida, Zbyněk (Společnost pro radioelektronické inženýrství, 2009-06)
    In this paper, the influence of the EBG structures on the far-field pattern of patch antennas is investigated. As a reference model, a conventional rectangular patch antenna on a high-permittivity substrate is used. The ...
  • Metamaterials: A Personal View 

    Sihvola, A. (Společnost pro radioelektronické inženýrství, 2009-06)
    This article discusses fundamental properties of metamaterials. Firstly, it is argued that the defining property of metamaterials is emergence and not that they should display properties not observable in nature. In addition, ...
  • Miniaturization of Planar Microwave Devices by Means of Complementary Spiral Resonators (CSRs): Design of Quadrature Phase Shifters 

    Siso, G.; Gil, M.; Aranda, M.; Bonache, J.; Martin, F. (Společnost pro radioelektronické inženýrství, 2009-06)
    In this work, two compact quadrature phase shifters based on metamaterial transmission lines implemented by means of complementary spiral resonators (CSRs) have been designed, fabricated and measured. The structures consist ...
  • Modeling of Modified Split-Ring Type Defected Ground Structure and Its Application as Bandstop Filter 

    Parui, S. K.; Das, S. (Společnost pro radioelektronické inženýrství, 2009-06)
    The shape of a popular split-ring defected ground structure (DGS) is modified by selecting different width of the sides with respect to microstrip line. The frequency characteristics of proposed DGS unit show an attenuation ...
  • Multifrequency Printed Antennas Loaded with Metamaterial Particles 

    Segovia-Vargas, D.; Herraiz-Martinez, F. J.; Ugarte-Munoz, E.; Montero-De-Paz, J.; Gonzalez-Posadas, V.; Garcia-Munoz, L. E. (Společnost pro radioelektronické inženýrství, 2009-06)
    This paper provides a review of printed antennas loaded with metamaterial particles. This novel technique allows developing printed antennas with interesting features such as multifrequency (simultaneous operation over two ...
  • A Simple Signal Shaper for GMSK/GFSK and MSK Modulator Based on Sigma-Delta Look-up Table 

    Svedek, T.; Herceg, M.; Matic, T. (Společnost pro radioelektronické inženýrství, 2009-06)
    Due to wide power spectrums of rectangular data streams, it is important for base-band signals to be heavily band limited before modulation. That can be achieved by pulse shaping of rectangular bits. Some of the most common ...
  • Some Advances in the Circuit Modeling of Extraordinary Optical Transmission 

    Medina, F.; Mesa, F.; Rodriguez-Berral, R. (Společnost pro radioelektronické inženýrství, 2009-06)
    The phenomenon of extraordinary optical transmission (EOT) through electrically small holes perforated on opaque metal screens has been a hot topic in the optics community for more than one decade. This experimentally ...
  • SPICE Model of Memristor with Nonlinear Dopant Drift 

    Biolek, Zdeněk; Biolek, Dalibor; Biolková, Viera (Společnost pro radioelektronické inženýrství, 2009-06)
    A mathematical model of the prototype of memristor, manufactured in 2008 in Hewlett-Packard Labs, is described in the paper. It is shown that the hitherto published approaches to the modeling of boundary conditions need ...
  • Superconductor Microwave Kinetic Inductance Detectors: System Model of the Readout Electronics 

    Alimenti, F.; Ercoli, M.; Palazzari, V.; Roselli, L. (Společnost pro radioelektronické inženýrství, 2009-06)
    This paper deals with the readout electronics needed by superconductor Microwave Kinetic Inductance Detectors (MKIDs). MKIDs are typically implemented in the form of cryogenic-cooled high quality factor microwave resonator. ...
  • Synthetic Aperture Radar - Hardware Development 

    Rosner, V.; Seller, R.; Dudas, L.; Kazi, K.; Miko, G. (Společnost pro radioelektronické inženýrství, 2009-06)
    Experimental real and synthetic aperture radar are developed from the base-band digital unit to the analogue RF parts, based on solid state units, using pulse compression for radar imaging. Proper QPSK code is found for ...
  • Using Digital Filtration for Hurst Parameter Estimation 

    Prochaska, J.; Vargic, R. (Společnost pro radioelektronické inženýrství, 2009-06)
    We present a new method to estimate the Hurst parameter. The method exploits the form of the autocorrelation function for second-order self-similar processes and is based on one-pass digital filtration. We compare the ...
  • UWB System Performance Improvement Using Smart Interference Rejection Filter 

    Dimitrijevic, B.; Milosevic, N.; Nikolic, Z.; Petrovic, P. (Společnost pro radioelektronické inženýrství, 2009-06)
    In this paper we proposed a smart interference rejection filter in TH-PPM UWB system, which improves the system\'s error probability for an order of magnitude in case of high power OFDM interference. The smart filter is ...
  • Wireless Sensor Networks: VAN-Project Perspectives 

    Lakkundi, V.; Kratzig, M. (Společnost pro radioelektronické inženýrství, 2009-06)
    The emergence of wireless sensor networks and their potential for a multitude of novel applications, especially in the industrial automation domain, are noteworthy. This paper presents research and development perspectives ...