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    Wyświetlanie 1-12 z 12
    Tytuł:
    High Gain WAT Antenna for 38 GHz 5G Systems
    Autorzy:
    Przesmycki, Rafał
    Bugaj, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/27312942.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    microstrip antenna
    high gain
    5G wireless system
    Opis:
    The article presents a high gain WAT microstrip antenna designed for 5G communication systems operating in the 38 GHz band. The antenna concerned has a compact structure with dimensions of 5. 16× 5. 05 mm. Rogers RT5880 laminate with a dielectric coefficient of 2. 2 and a thickness of 0. 254 mm was used as its substrate. The antenna works at a center frequency of 38 GHz and is characterized by a low reflection coefficient of – 29 .11 dB, a high energy gain of 7. 61 dB and a wide operating band of 1 .21 GHz (3. 18%). The paper presents an analysis of the simulation results and measurements of the device’s electrical parameters and radiation patterns.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 4; 76--82
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comprehensive Review of the Quadratic High Gain DC-DC Converter for Fuel Cell Application
    Autorzy:
    Jayachandran, Divya Navamani
    Sathik, Jagabar
    Padhi, Tanmay
    Kumari, Aditi
    Powiązania:
    https://bibliotekanauki.pl/articles/2055226.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fuel cell
    electric vehicle
    quadratic
    high gain
    SSA
    dynamic
    Opis:
    In the recent times, lot of research work carried out in the field of fuel cells explicitly divulges that it has the potential to be an ultimate power source in upcoming years. The fuel cell has more storing capacity, which enables to use in heavy power applications. In these applications, power conditioning is more vital to regulate the output voltage. Hence, we need a dc-dc converter to provide a constant regulated output voltage for such high-power system. Currently, many new converters were designed and implemented as per the requirement. This paper has made comparative study on several topologies of the quadratic high gain dc-dc converter and the applications where these topologies can be used when the fuel cell is given as a source. Also, we have compared various parameters of all the converters considered and generated the results with steady-state and dynamic study. In this article, we briefed the types of analysis carried on the dc-dc converter to study its performance. Moreover, various application of fuel cell is presented and discussed. This paper will be a handbook to the researchers who start to work on high gain dc-dc converter topologies with quadratic boost converter as a base. This article will also guide the engineers to concentrate on the fuel cell components where it needs to be explored for optimizing its operation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 2; 299--306
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A High Gain Single Switch DC-DC Converter with Double Voltage Booster Switched Inductors
    Autorzy:
    Addagatla, Nagaraju
    Boini, Rajender
    Powiązania:
    https://bibliotekanauki.pl/articles/2201925.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    multilevel converter
    boost converter
    DC-DC converter
    high gain converters
    Opis:
    The research for novel power conversion topologies and the development of cutting-edge power component technologies are driven by the demand for renewable and much more efficient electricity generation, delivery, and conversion. Simulation and Analysis High Voltage Gain DC-DC Converter with Double Voltage Booster Switched Inductor for PV Applications are analyzed in this paper. Multilevel boost converter topologies recently reintroduced, are gaining popularity as a solution for industrial and transportation power systems because they enable the use of innovative, efficient, but relatively low voltage low-voltage devices at greater voltage and power levels. there is only one power switch on the converter that is planned here, three diodes, two capacitors, and two inductors to achieve ultra-high gain with better efficiency. High voltage gain, minimal switch stress, and the ability to lessen input-current ripple and capacitor voltage ripple are all benefits of the topology. When it switches complementary, the capacitors' ripple is reduced, which lowers the size requirement for the capacitors. A 12V, 500 watts prototype was analyzed, simulated and designed. at a duty cycle of 0.75 it is achieved high DC-DC gain i.e 19 and efficiency 93%. The practicality of the converter will be demonstrated by the close agreement between the analysis and simulation findings.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 2; 1--11
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Analysis of a Low-profile Microstrip Antenna for 5G Applications using AI-based PSO Approach
    Autorzy:
    Kundu, Krishanu
    Bhattacharya, Ankan
    Mohammed, Firdous Hussain
    Pathak, Narendra Nath
    Powiązania:
    https://bibliotekanauki.pl/articles/24200747.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    5G applications
    high gain
    low profile
    microstrip patch antenna
    PSO
    Opis:
    Microstrip antennas are high gain aerials for low-profile wireless applications working with frequencies over 100 MHz. This paper presents a study and design of a low cost slotted-type microstrip patch antenna that can be used in 5G millimeter wave applications. This research focuses on the effect of ground slots and patch slots which, in turn, affect different antenna parameters, such as return loss, VSWR, gain, radiation pattern, and axial ratio. The working frequency range varies from 24 to 28 GHz, thus falling within 5G specifications. A subset of artificial intelligence (AI) known as particle swarm optimization (PSO) is used to approximatively solve issues involving maximization and minimization of numerical values, being highly challenging or even impossible to solve in a precise manner. Here, we have designed and analyzed a low-profile printed microstrip antenna for 5G applications using the AI-based PSO approach. The novelty of the research is mainly in the design approach, compactness of size and antenna applicability. The antenna was simulated with the use of HFSS simulation software.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 3; 68--73
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance and stability analysis of series-cascaded, high-gain, interleaved boost converter for photovoltaic applications
    Autorzy:
    Prasanna Kumar, C.
    Venugopal, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193536.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    series cascade
    interleaved boost converter
    high gain
    stability
    fast Fourier transform
    Opis:
    Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.
    Źródło:
    Power Electronics and Drives; 2018, 3, 38; 85-97
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-gain feedback and sliding modes in infinite dimensional systems
    Autorzy:
    Levaggi, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/970418.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    system nieskończenie wymiarowy
    zaburzenia osobliwe
    infinite dimensional systems
    high-gain feedback
    singular perturbations
    sliding modes
    Opis:
    This paper focuses on the connection between sliding motions and low frequency modes of high-gain feedback systems in an infinite dimensional framework. We study a particular class of abstract control systems in a Hilbert space setting and analyse their high-gain behaviour through singular perturbations. We show that the "slow" motion derived from the reduced model approximates the evolution of the closed loop after a fast transient. Moreover we prove a relation between this slow component of the high-gain feedback system and sliding motions, in the spirit, of the analogous result in the finite dimensional setting by Young, Kokotovic and Utkin (Young et al., 1977).
    Źródło:
    Control and Cybernetics; 2004, 33, 1; 33-50
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new algebraic LQR weight selection algorithm for tracking control of 2 DoF torsion system
    Autorzy:
    Elumalai, V. K.
    Subramanian, R. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/140978.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ARE
    high gain observer
    LQR
    Q and R matrices
    2 DoF torsion system
    trajectory tacking
    Opis:
    This paper proposes a novel linear quadratic regulator (LQR) weight selection algorithm by synthesizing the algebraic Riccati equation (ARE) with the Lagrange multiplier method for command following applications of a 2 degree of freedom (DoF) torsion system. The optimal performance of LQR greatly depends on the elements of weighting matrices Q and R. However, normally these weighting matrices are chosen by a trial and error approach which is not only time consuming but cumbersome. Hence, to address this issue, blending the design criteria in time domain with the ARE, we put forward an algebraic weight selection algorithm, which makes the LQR design both simple and modular. Moreover, to estimate the velocity of a servo angle, a high gain observer (HGO) is designed and integrated with the LQR control scheme. The efficacy of the proposed control scheme is tested on a benchmark 2 DoF torsion system for a trajectory tracking application. Both the steady state and dynamic characteristics of the proposed controller are assessed. The experimental results accentuate that the proposed HGO based LQR scheme can guarantee the system to attain the design requirements with minimal vibrations and tracking errors.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 55-75
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies
    Autorzy:
    Stala, R.
    Piróg, S.
    Penczek, A.
    Kawa, A.
    Waradzyn, Z.
    Mondzik, A.
    Skała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/953065.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DC-DC converter
    high power converters
    resonant converter
    high voltage gain
    zero current switching
    przetwornica DC/DC
    konwerter
    moc
    wysokie napięcie
    Opis:
    This paper presents the concept of topologies and investigation results of switched-capacitor voltage multipliers designed for application in high power systems. The analyzed family of multilevel converters includes established topologies as well as novel concepts. The application of thyristors as well as the invention of novel concepts of multiplier topologies and appropriate control make it possible to achieve high efficiency, high voltage gain, reliable and simple DC-DC converters for high power systems. Based on analytical models of the SCVMs, the paper presents a discussion of the selection of components and the efficiency of the converters as a function of converted power as well as the voltage range on the input and the output side. The results are supported by computer simulations and demonstrative experimental tests.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 639-651
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Compact Quasi-Yagi Microstrip Patch Antenna with High Gain and Bandwidth for UWB Application
    Autorzy:
    Chowdhury, Hasanur Rahman
    Hussain, Sakhawa
    Powiązania:
    https://bibliotekanauki.pl/articles/27311937.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Quasi Yagi microstrip patch antenna
    FR4 substrate
    ultra-wide bandwidth (UWB)
    high antenna gain and low return loss
    Opis:
    A quasi-Yagi microstrip patch antenna with four directors and truncated ground plane has been designed and fabricated to have an ultra-wide bandwidth, high gain, low return loss and better directivity with center frequency at 3.40 GHz. After optimization, the proposed antenna yields an ultra-wide bandwidth of 1.20 GHz with lower and upper cutoff frequencies at 3.12 GHz and 4.32 GHz, respectively. High gain of 5.25 dB, return loss of -28 dB and directivity of 6.28 dB are obtained at resonance frequency of 3.40 GHz. The measured results of fabricated antenna have shown excellent agreement with the simulation results providing bandwidth of 1.34 GHz with lower and upper cutoff frequencies at 3.04 GHz and 4.38 GHz, respectively. The antenna gain of 5.33 dB, return loss of -44 dB are obtained at resonance frequency of 3.36 GHz. The dimension of the antenna is only of 65 mm x 45 mm ensuring compact in size.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 3; 431--437
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Izolowany przekształtnik podwyższający DC/DC o wysokim współczynniku wzmocnienia napięcia
    Isolated step-up DC/DC converter with high input voltage gain
    Autorzy:
    Krupa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/277343.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    przekształtnik DC/DC
    współczynnik wzmocnienia napięcia
    izolacja galwaniczna
    transformator wyrównawczy
    DC/DC converter
    high voltage gain
    galvanic isolation
    balancing transformer
    Opis:
    Uzyskanie wymaganego poziomu napięcia wyjściowego przy niskich napięciach wejściowych sprawia, że tranzystory przekształtnika podwyższającego DC/DC przełączają prądy o znacznych wartościach, co wiąże się ze zwiększeniem strat energii. Aby uzyskać sprawność przekształtnika powyżej 90 % w szerokim zakresie przetwarzanej mocy wejściowej przy „twardym” przełączaniu łączników półprzewodnikowych należy podzielić znaczny prąd wejściowy na kilka mniejszych pętli prądowych. Zmniejszy to straty przewodzenia tranzystorów, które stanowią przeważającą część strat energii w tego typu układach. Zastosowanie transformatorów równoważących pozwoli zachować równomierny rozpływ prądu wejściowego, a transformatorów izolujących - separację galwaniczną oraz wzmocnienie napięcia zależne od ich przekładni.
    Obtaining a desired level of output voltage at low input voltages makes the transistors of DC/DC boost converter switch currents of considerable value, which is associated with an increase in energy losses. In order to achieve converter efficiency greater than 90 % in a broad range of input power processed at the “hard” switching of semiconductor switches significant input current should be divided into several smaller current loops. This will reduce the conduction losses of transistors which are the vast majority of energy loss in this type of systems. The use of balancing transformers will keep the equal input current distribution and isolation transformers ensure galvanic isolation and voltage gain dependent on their turns ratio.
    Źródło:
    Pomiary Automatyka Robotyka; 2014, 18, 2; 106-111
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust estimation based nonlinear higher order sliding mode control strategies for PMSG-WECS
    Autorzy:
    Nazir, Awais
    Khan, Safdar Abbas
    Khan, Malak Adnan
    Alam, Zaheer
    Khan, Imran
    Irfan, Muhammad
    Rehman, Saifur
    Nowakowski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/27311430.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    wind energy conversion systems
    WECS
    robust control
    maximum power point tracking
    MPPT
    sliding mode control
    SMC
    super-twisting algorithm
    STA
    high gain observer
    artificial neural network
    ANN
    function fitting
    backstepping
    śledzenie maksymalnego punktu mocy
    obserwator o dużym wzmocnieniu
    sztuczna sieć neuronowa
    dopasowanie funkcji
    system konwersji energii wiatrowej
    sterowanie odporne
    sterowanie ślizgowe
    algorytm super skręcania
    Opis:
    The wind energy conversion systems (WECS) suffer from an intermittent nature of source (wind) and the resulting disparity between power generation and electricity demand. Thus, WECS are required to be operated at maximum power point (MPP). This research paper addresses a sophisticated MPP tracking (MPPT) strategy to ensure optimum (maximum) power out of the WECS despite environmental (wind) variations. This study considers a WECS (fixed pitch, 3KW, variable speed) coupled with a permanent magnet synchronous generator (PMSG) and proposes three sliding mode control (SMC) based MPPT schemes, a conventional first order SMC (FOSMC), an integral back-stepping-based SMC (IBSMC) and a super-twisting reachability-based SMC, for maximizing the power output. However, the efficacy of MPPT/control schemes rely on availability of system parameters especially, uncertain/nonlinear dynamics and aerodynamic terms, which are not commonly accessible in practice. As a remedy, an off-line artificial function-fitting neural network (ANN) based on Levenberg-Marquardt algorithm is employed to enhance the performance and robustness of MPPT/control scheme by effectively imitating the uncertain/nonlinear drift terms in the control input pathways. Furthermore, the speed and missing derivative of a generator shaft are determined using a high-gain observer (HGO). Finally, a comparison is made among the stated strategies subjected to stochastic and deterministic wind speed profiles. Extensive MATLAB/Simulink simulations assess the effectiveness of the suggested approaches.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e147063
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultraszerokopasmowy rozłożony wzmacniacz kaskadowy
    Ultra-broadband distributed cascaded amplifier
    Autorzy:
    Kral, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/320345.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    ultraszerokopasmowy
    linia transmisyjna
    rozłożony wzmacniacz kaskadowy
    tranzystor polowy
    tranzystor polowy z nośnikami o dużej ruchliwości
    HEMT
    wzmocnienie mocy
    ultrabroadband
    transmission line
    cascaded single stage distributed amplifier
    high electron mobility transistor
    power gain
    Opis:
    W opracowaniu przedstawiono kaskadowy wzmacniacz rozłożony zdolny do przenoszenia ekstremalnie szerokich pasm częstotliwości przy dużym (multiplikatywnym) wzmocnieniu. Przedstawiono koncepcję wzmacniacza i wyprowadzono zależności na wzmocnienia napięciowe i mocy jego bezstratnej i unilateralnej wersji. Poddano szczegółowej analizie podstawowe bloki wzmacniacza oraz sformułowano kryteria doboru elementów. Przedstawiono też porównawcze wyniki symulacji wzmacniacza ze stratami własnymi użytego modelu tranzystora. Praca ma znaczenie praktyczne, bowiem zaprojektowane zgodnie z nią elementy wzmacniacza mogą stanowić dobre wartości początkowe procesu optymalizacji komputerowej.
    Cascaded Single Stage Distributed Amplifier (CSSDA) is presented. Amplifier gain formulas are derived for lossless and unilateral version. Fundamental parts of amplifier are submitted to detailed discussion and criteria of elements' selection are formulated. Comparative results of amplifier simulation with loss transistor model are quoted. The paper is of practical importance since it shows how to design elements' values which can be good starting point for computer optimization.
    Źródło:
    Elektrotechnika i Elektronika; 2006, 25, 2; 106-112
    1640-7202
    Pojawia się w:
    Elektrotechnika i Elektronika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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