Recent Submissions

  • Fractional-order chaotic memory with wideband constant phase elements 

    Petržela, Jiří (MDPI, 2020-04-09)
    This paper provides readers with three partial results that are mutually connected. Firstly, the gallery of the so-called constant phase elements (CPE) dedicated for the wideband applications is presented. CPEs are calculated ...
  • Illuminance Sensing in Agriculture Applications Based on Infra-Red Short-Range Compact Transmitter Using 0.35um CMOS Active Device 

    Šotner, Roman; Jeřábek, Jan; Polák, Ladislav; Petržela, Jiří; Jaikla, Winai; Tuntrakool, Sunti (IEEE, 2020-01-29)
    This paper introduces a novel electronic system for simplex low-bitrate infra-red (IR) communication applications. The transmitter is implemented completely by analog building blocks, formed with the help of a recently ...
  • Research of the Operator's Advisory System Based on Fuzzy Logic for Pelletizing Equipment 

    Andriukaitis, Darius; Laucka, Andrius; Valinevicius, Algimantas; Zilys, Mindaugas; Markevicius, Vytautas; Navikas, Dangirutis; Šotner, Roman; Petržela, Jiří; Jeřábek, Jan; Herencsár, Norbert; Klimenta, Dardan (MDPI, 2019-11-12)
    Fertilizer manufacturing in the chemical industry is closely related with agricultural production. More than a half of raw materials for food products are grown by fertilizing plants. The demand of fertilizers has been ...
  • Electronically Adjustable Emulator of the Fractional-Order Capacitor 

    Dvořák, Jan; Kubánek, David; Herencsár, Norbert; Kartci, Aslihan; Bertsias, Panagiotis (Kaunas University of Technology, 2019-12-12)
    This paper presents a design of the controllable emulator of the FOC (Fractional-Order Capacitor) and its application. The circuit is based on 5th-order RC topology (type Foster I) where the passive elements in the topology ...
  • Fractional-Order Phase Shifters with Constant Magnitude Frequency Responses 

    Šotner, Roman; Langhammer, Lukáš; Jeřábek, Jan; Ushakov, Peter A.; Dostál, Tomáš (Kaunas University of Technology, 2019-10-10)
    This contribution presents and experimentally analyzes the idea how to reach the constant magnitude as well as the phase response in the fractional-order (FO) phase when shifting two-ports. The straightforward method ...
  • Novel Reconnection-less Reconfigurable Filter Design Based on Unknown Nodal Voltages Method and Its Fractional-Order Counterpart 

    Langhammer, Lukáš; Šotner, Roman; Dvořák, Jan; Jeřábek, Jan; Ushakov, Peter A. (Kaunas University of Technology, 2019-06-26)
    A novel solution of reconnection-less electronically reconfigurable filter is introduced in the paper. The filter is designed based on unknown nodal voltages method (MUNV) using operational transconductance amplifiers ...
  • Fractional-Order Asymptotical Phase Shifter With Flat Magnitude Response 

    Šotner, Roman; Langhammer, Lukáš; Jeřábek, Jan; Dostál, Tomáš (IEEE, 2019-06-26)
    This work deals with design of fractional-order asymptotical phase shifter having constant magnitude response within almost three decades (100 Hz – 100 kHz) and frequency dependent phase difference going from 0 to 45 ...
  • Analogue Implementation of a Fractional-Order PI^{\lambda} Controller for DC Motor Speed Control 

    Herencsár, Norbert; Kartci, Aslihan; Koton, Jaroslav; Šotner, Roman; Alagoz, Baris Baykant; Yeroglu, Celaleddin (IEEE, 2019-06-12)
    In this paper, an approach to design a fractional-order integral operator s(lambda) where -1 < lambda <0, using an analogue technique, is presented. The integrator with a constant phase angle -80.1 degree (i.e. order lambda ...
  • Accurate constant phase elements dedicated for audio signal processing 

    Petržela, Jiří (MDPI, 2019-11-15)
    This review paper introduces real-valued two-terminal fully passive RC ladder structures of the so-called constant phase elements (CPE). These lumped electronic circuits can be understood as two-terminal elements described ...
  • Hamilton’s principle for circuits with dissipative elements 

    Biolek, Zdeněk; Biolek, Dalibor; Biolková, Viera (Hindawi, 2019-10-28)
    The classic form of Hamilton’s variational principle does not hold for circuits with dissipative elements. It is shown in the paper that this may not be true in the case of systems consisting of the so-called higher-order ...
  • Analog Implementation of Fractional-Order Elements and Their Applications 

    Kartci, Aslihan (2019-06-24)
    With advancements in the theory of fractional calculus and also with widespread engineering application of fractional-order systems, analog implementation of fractional-order integrators and differentiators have received ...
  • Analog Implementation of Fractional-Order Elements and Their Applications 

    Kartci, Aslihan (2019-06-24)
    With advancements in the theory of fractional calculus and also with widespread engineering application of fractional-order systems, analog implementation of fractional-order integrators and differentiators have received ...
  • 60-GHz Millimeter-Wave Propagation Inside Bus: Measurement, Modeling, Simulation, and Performance Analysis 

    Chandra, Aniruddha; Ur Rahman, Aniq; Ghosh, Ushasi; García-Naya, José; Prokeš, Aleš; Blumenstein, Jiří; Mecklenbräuker, Christoph (IEEE, 2019-06-24)
    Millimeter-wave (mmWave) transmission over the unlicensed 60-GHz spectrum is a potential solution to realize high-speed internet access, even inside mass transit vehicles. The solution involves communication between users ...
  • Lagrangian for circuits with higher-order elements 

    Biolek, Zdeněk; Biolek, Dalibor; Biolková, Viera (MDPI, 2019-10-29)
    The necessary and sufficient conditions of the validity of Hamilton’s variational principle for circuits consisting of (alpha,beta) elements from Chua’s periodical table are derived. It is shown that the principle holds ...
  • Wideband UHF and SHF long-range channel characterization 

    Kassem, Edward; Blumenstein, Jiří; Povalač, Aleš; Vychodil, Josef; Pospíšil, Martin; Maršálek, Roman; Hruška, Jiří (Springer Open, 2019-07-23)
    This paper presents an outdoor long-range (from 315 m up to 5.3 km) fixed channel campaign for both ultra high frequency and super high frequency bands with co-polarized horizontal and vertical antenna configurations. It ...
  • New nonlinear active element dedicated to modeling chaotic dynamics with complex polynomial vector fields 

    Petržela, Jiří; Šotner, Roman (MDPI, 2019-09-06)
    This paper describes evolution of new active element that is able to significantly simplify the design process of lumped chaotic oscillator, especially if the concept of analog computer or state space description is adopted. ...
  • Design of Fractional-Order Integrator Controlled by Single Voltage Gain 

    Šotner, Roman; Petržela, Jiří; Jeřábek, Jan; Herencsár, Norbert; Andriukaitis, Darius (IEEE, 2019-07-01)
    This work presents analyses of interaction of fractional- and integer-order transfer functions when their responses are added together by simple linear operation of sum. The mathematical background is very complex but ...
  • Comparative Study of Op-Amp-based Integrators Suitable for Fractional-Order Controller Design 

    Herencsár, Norbert; Kartci, Aslihan; Yildiz, Hacer A.; Šotner, Roman; Dvořák, Jan; Kubánek, David; Jeřábek, Jan; Koton, Jaroslav (IEEE, 2019-07-01)
    In this paper, a fractional-order capacitor (FOC) of an order = 0.89 (i.e. constant phase angle –80.1 degree) was emulated via Valsa RC network with five branches. The network component values were optimized using modified ...
  • Synthesis and Optimization of Fractional-Order Elements Using a Genetic Algorithm 

    Kartci, Aslihan; Agambayev, Agamyrat; Farhat, Mohamed; Herencsár, Norbert; Brančík, Lubomír; Bagci, Hakan; Salama, Khaled Nabil (IEEE, 2019-06-14)
    This study proposes a new approach for the optimization of phase and magnitude responses of fractional-order capacitive and inductive elements based on the mixed integer-order genetic algorithm (GA), over a bandwidth of ...
  • Millimeter Wave Vehicular Channel Emulation: A Framework for Balancing Complexity and Accuracy 

    Blazek, Thomas; Zöchmann, Erich; Mecklenbräuker, Christoph (MDPI, 2018-11-16)
    We propose a general framework for the specification of a sparse representation of millimeter wave vehicular propagation channels and apply this to both synthetic data and real-world observations from channel sounding ...

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