Browsing 2008/4 by Issue Date

Now showing items 1-20 of 33

  • Recent Techniques in Design and Implementation of Microwave Planar Filters 

    Baral, R. N.; Singhal, P. K. (Společnost pro radioelektronické inženýrství, 2008-12)
    This paper details the techniques and initiatives made recently for improved response and simultaneous development of microwave planar filters. Although the objective of all the techniques is to design low cost filters ...

  • Design of Microstrip Band Pass Fractal Filter for Suppression of Spurious Band 

    Baral, R. N.; Singhal, P. K. (Společnost pro radioelektronické inženýrství, 2008-12)
    In this paper, the design and subsequent fabrication of a hairpin-line band pass filter has been proposed. This filter exhibits periodic frequency response. By proper design, the spurious bands are being suppressed ...

  • A New CAC Method Using Queuing Theory 

    Baronak, Ivan; Kvackaj, Peter (Společnost pro radioelektronické inženýrství, 2008-12)
    The CAC (Connection Admission Control) method plays an important role in the ATM (Asynchronous Transfer Mode) network environment. The CAC is the first step in the prevention of congested states in the network topology, ...

  • An Efficient Finger Allocation Method for the Maximum Likelihood RAKE Receiver 

    Baltzis, Konstantinos B. (Společnost pro radioelektronické inženýrství, 2008-12)
    In wideband wireless communication systems the RAKE receiver is commonly used to collect the resolvable multipath energy and counter the effects of fading through diversity. However, in channels with large delay and energy ...

  • EMC of Frequency Controlled Electric Drives 

    Novak, Jaroslav; Simanek, Jiri; Cerny, Ondrej; Dolecek, Radovan (Společnost pro radioelektronické inženýrství, 2008-12)
    The paper deals with solution possibilities of EMC for voltage inverters, which uses PWM (Pulse Width Modulation). The paper offers solution of interference suppression which is raised by operation of frequency controlled ...

  • Optimization of Micro Strip Array Antennas Using Hybrid Particle Swarm Optimizer with Breeding and Subpopulation for Maximum Side-Lobe Reduction 

    Chaker, Hichem; Meriah, Sidi Mohamed; Bendimerad, Fethi Tarik (Společnost pro radioelektronické inženýrství, 2008-12)
    In this paper, a technique based on hybrid particle swarm optimiser with breeding and subpopulation is presented for optimal design of reconfigurable dual-beam linear array antennas and planar arrays. In the amplitudephase ...

  • EMC Increasing of PWM Rectifier in Comparison with Classical Rectifier 

    Lettl, Jiri; Dolecek, Radovan (Společnost pro radioelektronické inženýrství, 2008-12)
    Pulse width modulated rectifier is a very popular topic nowadays. The modern industrial production demands continuous and lossless conversion of electrical energy parameters. This need leads to wide spread of power ...

  • Slotted PIFA for Mobile Communication Devices 

    Bonefacic, Davor; Rapinac, Bojan; Bartolic, Juraj (Společnost pro radioelektronické inženýrství, 2008-12)
    Slotted PIFA with capacitive loading for operation in the 880 / 960 MHz band is presented. The PIFA is intended for mobile terminals in GSM mobile communication network. The antenna is placed on a ground plane with dimensions ...

  • Universal Generator of Ultra-Wideband Pulses 

    Protiva, Pavel; Mrkvica, Jan; Machac, Jan (Společnost pro radioelektronické inženýrství, 2008-12)
    An Ultra-Wideband (UWB) subnanosecond pulse generator is described in this paper. High amplitude Gaussian pulses are generated by a Step Recovery Diode (SRD) included in a novel pulse forming circuit. The pro-posed circuit ...

  • Utilization of Faraday Mirror in Fiber Optic Current Sensors 

    Drexler, Petr; Fiala, Pavel (Společnost pro radioelektronické inženýrství, 2008-12)
    Fiber optic sensors dispose of some advantages in the field of electrical current and magnetic field measurement, like large bandwidth, linearity, light transmission possibilities. Unfortunately, they suffer from some ...

  • Implementation of Industrial Narrow Band Communication System into SDR Concept 

    Bobula, Marek; Danek, Karel; Prokes, Ales (Společnost pro radioelektronické inženýrství, 2008-12)
    The rapid expansion of the digital signal processing has penetrated recently into a sphere of high performance industrial narrow band communication systems which had been for long years dominated by the traditional analog ...

  • Parametric Study of Mushroom-like and Planar Periodic Structures in Terms of Simultaneous AMC and EBG Properties 

    Kovacs, Peter; Raida, Zbynek; Martinez-Vazquez, Marta (Společnost pro radioelektronické inženýrství, 2008-12)
    In the paper, the parametric analysis of a mushroom-like and a planar metallo-dielectric periodic structure with square unit cell and metallic patch is presented. First, the angular stability for different unit cell settings ...

  • A Simple Current-Mode Quadrature Oscillator Using Single CDTA 

    Jaikla, Winai; Siripruchyanun, Montree; Bajer, Josef; Biolek, Dalibor (Společnost pro radioelektronické inženýrství, 2008-12)
    This article presents a simple current-mode quadrature oscillator using a single Current Differencing Transconductance Amplifier (CDTA) as the active element. The oscillation condition and oscillation frequency can be ...

  • Ways to Optimize Analogue Switched Circuits 

    Dolivka, Lukas; Hospodka, Jiri (Společnost pro radioelektronické inženýrství, 2008-12)
    This paper describes how analogue switched circuits (switched-capacitor and switched-current circuits) can be optimized by means of a personal computer. The optimization of this kind of circuits is not so common and their ...

  • Shielding Effectiveness of Laminated Shields 

    Jayasree, P. V. Y.; Baba, V. S. S. N. Srinivasa; Rao, B. Prabhakara (Společnost pro radioelektronické inženýrství, 2008-12)
    Shielding prevents coupling of undesired radiated electromagnetic energy into equipment otherwise susceptible to it. In view of this, some studies on shielding effectiveness of laminated shields with conductors and conductive ...

  • The Time Difference of Arrival Estimation of Wi-Fi Signals 

    Nemec, Zdenek; Bezousek, Pavel (Společnost pro radioelektronické inženýrství, 2008-12)
    The papers deals with a modeling of a Time- Difference of Arrival system for a subscriber station localization, based on the 802.11 standard wireless network. In the case of severe multipath effects the standard TDOA ...

  • The Utilization of Novel Bandpass Sigma-delta Modulator for Capacitance Pressure Sensor Signal Processing 

    Haze, Jiri; Fujcik, Lukas; Vrba, Radimir; Pavlik, Michal; Michaeli, Linus (Společnost pro radioelektronické inženýrství, 2008-12)
    The paper deals with a novel approach to processing of pressure sensor signals. A bandpass sigma-delta modulator is used for this purpose. This technique is relatively new and it is not used widely, because this kind of ...

  • Eyelid Localization for Iris Identification 

    Adam, Mathieu; Rossant, Florence; Amiel, Frederic; Mikovikova, Beata; Ea, Thomas (Společnost pro radioelektronické inženýrství, 2008-12)
    This article presents a new eyelid localization algorithm based on a parabolic curve fitting. To deal with eyelashes, low contrast or false detection due to iris texture, we propose a two steps algorithm. First, possible ...

  • Electronically Tunable Multi-Terminal Floating Nullor and Its Applications 

    Tangsrirat, Worapong (Společnost pro radioelektronické inženýrství, 2008-12)
    A realization scheme of an electronically tun- able multi-terminal floating nullor (ET-MTFN) is de- scribed in this paper. The proposed circuit mainly employs a transconductance amplifier, an improved translinear cell, two ...

  • Application of a Cumulative Method for Car Borders Specification in Image 

    Dobrovolny, Martin; Bezousek, Pavel; Hajek, Martin (Společnost pro radioelektronické inženýrství, 2008-12)
    The paper deals with low-level car detection methods in images. The car detection is an integral part of all intelligent car cruise systems. This article describes the method for suppression of the edges produced by classical ...