Rok 2023

• Rapid Design of 3D Reflectarray Antennas by Inverse Surrogate Modeling and Regularization

  Publikacja

  • S. Kozieł
  • M. Belen
  • A. Caliskan
  • P. Mahouti

  - IEEE Access - Rok 2023

  Reflectarrays (RAs) exhibit important advantages over conventional antenna arrays, especially in terms of realizing pencil-beam patterns without the employment of the feeding networks. Unfortunately, microstrip RA implementations feature narrow bandwidths, and are severely affected by losses. A considerably improved performance can be achieved for RAs involving grounded dielectric layers, which are also easy to manufacture using...

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• Shape Memory Alloy-Based Fluidically Reconfigurable Metasurfaced Beam Steering Antenna

  Publikacja

  • S. Shah
  • S. Shah
  • E. Bernhardsson
  • S. Kozieł

  - IEEE Access - Rok 2023

  A low-cost actuator-based fluidically programmable metasurface (FPMS) antenna is proposed to solve the slow tuning speed problem of the manually fluidic based reconfigurable antennas. The FPMS-based antenna is probe-fed and comprises a 4 × 4 square ring metasurface as a superstrate. Moreover, two shape memory alloy (SMA)-based electrically-controlled actuators are employed in the design for controlling the position of the 3D-printed...

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• Stability Enhancement of Grid-Connected Wind Power Generation System Using PSS, SFCL and STATCOM

  Publikacja

  • M. Sarwar
  • M. Arshed
  • B. Hussain
  • M. Rasheed
  • H. Tariq
  • S. Czapp
  • S. Tariq
  • I. A. Sajjad

  - IEEE Access - Rok 2023

  The stability related issues may occur in a power system due to disturbances in generating or loading conditions, especially in the presence of distributed generation (DG) based on renewable energy resources (RERs). This paper proposes a novel strategy for the stability enhancement of a wind power generation system (WPGS) by using a combination of three devices, namely, a power system stabilizer (PSS), resistive superconductor...

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• Strategies for Dealing With Software Product Management Challenges

  Publikacja

  • O. Springer
  • J. Miler
  • M. Wróbel

  - IEEE Access - Rok 2023

  Software product management, which involves multiple processes and responsibilities and links to many activities within the organisation, increases the success rate of IT projects. However, the adoption of product management activities and the implementation of the software product manager role itself varies between companies. This research explores the topic of software product managers’ strategies for dealing with challenges...

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• User Authentication by Eye Movement Features Employing SVM and XGBoost Classifiers

  Publikacja

  • P. Odya
  • F. Górski
  • A. Czyżewski

  - IEEE Access - Rok 2023

  Devices capable of tracking the user’s gaze have become significantly more affordable over the past few years, thus broadening their application, including in-home and office computers and various customer service equipment. Although such devices have comparatively low operating frequencies and limited resolution, they are sufficient to supplement or replace classic input interfaces, such as the keyboard and mouse. The biometric...

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• Using Continuous Integration Techniques in Open Source Projects – An Exploratory Study

  Publikacja

  • M. Wróbel
  • J. Szymukowicz
  • P. Weichbroth

  - IEEE Access - Rok 2023

  For a growing number of software projects, continuous integration (CI) techniques are becoming an essential part of the process. However, the maturity of their adoption in open source projects varies. In this paper, we present an empirical study on GitHub repositories to explore the use of continuous integration techniques in open source projects. Following the Goal-Question-Metric (GQM) approach, 3 research questions and 7 metrics...

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Rok 2022

• A Comprehensive Survey on Antennas On-Chip Based on Metamaterial, Metasurface, and Substrate Integrated Waveguide Principles for Millimeter-Waves and Terahertz Integrated Circuits and Systems

  Publikacja

  • M. Alibakhshikenari
  • E. M. Ali
  • M. Soruri
  • M. Dalarsson
  • M. Naser-moghadasi
  • B. S. Virdee
  • C. Stefanovic
  • A. Pietrenko-Dąbrowska
  • S. Kozieł
  • S. Szczepański
  • E. Limiti

  - IEEE Access - Rok 2022

  Antennas on-chip are a particular type of radiating elements valued for their small footprint. They are most commonly integrated in circuit boards to electromagnetically interface free space, which is necessary for wireless communications. Antennas on-chip radiate and receive electromagnetic (EM) energy as any conventional antennas, but what distinguishes them is their miniaturized size. This means they can be integrated inside...

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• A Cross-Polarisation Discrimination Analysis of Off-Body Channels in Passenger Ferryboat Environments

  Publikacja

  • S. J. Ambroziak (dawniej: S. Ambroziak)
  • K. Cwalina
  • P. Rajchowski
  • F. D. Cardoso
  • M. M. Ferreira
  • L. M. Correia

  - IEEE Access - Rok 2022

  There is a need for investigating radio channels for Body Area Networks considering the depolarisation phenomenon and new types of environments, since these aspects are becoming very important for systems design and deployment. This paper presents an analysis of cross-polarisation discrimination for off-body channels based on a measurement campaign performed in a passenger ferryboat, i.e., where all walls, floors and ceilings are...

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• A Survey of Vehicular Network Systems for Road Traffic Management

  Publikacja

  • K. Jurczenia
  • J. Rak

  - IEEE Access - Rok 2022

  In this survey, we analyze the proposals of vehicular communication systems in the context of road traffic management. Starting with the definition of communications between vehicles (V2V), vehicles-to-infrastructure (V2I) and vehicles-to-everything (V2X), we first focus on the requirements and current standards for the Intelligent Transport Systems (ITS), including the maximum communication delay, the communication range and the...

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• Advanced Control With PLC—Code Generator for aMPC Controller Implementation and Cooperation With External Computational Server for Dealing With Multidimensionality, Constraints and LMI Based Robustness

  Publikacja

  • J. Tarnawski
  • P. Kudełka
  • M. Korzeniowski

  - IEEE Access - Rok 2022

  The manufacturers of Programmable Logic Controllers (PLC) usually equip their products with extremely simple control algorithms, such as PID and on-off regulators. However, modern PLCs have much more efficient processors and extensive memory, which enables implementing more sophisticated controllers. The paper discusses issues related to the implementation of matrix operations, time limitations for code execution within one PLC...

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• An Empirical Study on the Impact of Gender on Mobile Applications Usability

  Publikacja

  • P. Weichbroth

  - IEEE Access - Rok 2022

  In the area of broadband wireless Internet, mobile applications have already replaced their desktop equivalents and are recognized as valuable tools for any size of businesses and for private use. With the emergence of millions of apps, the quality of their interaction with the user remains an open question for software vendors. While female and male requirements and preferences are not always similar, to the best of our knowledge,...

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• Application of the ISE Optimized Proportional Control of the Wave Maker in a Towing Tank

  Publikacja

  • M. Drzewiecki
  • J. Guziński

  - IEEE Access - Rok 2022

  This paper presents the improvement of the wave maker control system. The wave maker is a facility widely used in hydromechanics laboratories to generate waves in towing tanks. It is equipped with an electrohydraulic drive and an actuator submerged into water. The waves are generated to model the environmental conditions for physical experiments, performed on reduced-scale models of maritime objects. The physical experiments allow...

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• Fault-tolerant performance of the novel five-phase doubly-fed induction generator

  Publikacja

  • R. Ryndzionek
  • K. Blecharz
  • F. Kutt
  • M. Michna
  • G. A. Kostro (dawniej: G. Kostro)

  - IEEE Access - Rok 2022

  The article presents the concept of a new design of a multi-phase doubly-fed induction generator (DFIG). The innovative design approach uses a five-phase power supply from the rotor side of the generator with a three-phase classic stator power supply. Modern three-phase doubly-fed induction generators are the dominant choice for Wind Energy Conversion Systems (WECS). Solutions of this type are sensitive to the loss of at least...

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• Highly-Miniaturized Dual-Mode Bandpass Filter Based on Quarter-Mode Substrate Integrated Waveguide with Wide Stopband

  Publikacja

  • R. K. Barik
  • S. Kozieł
  • S. Szczepański

  - IEEE Access - Rok 2022

  This paper presents a novel design of a highly-miniaturized dual-mode bandpass filter (BPF) employing a quarter-mode substrate integrated waveguide (QMSIW). The QMSIW resonator is based on a square cavity with metallic vias along two sides, and open-ended edges at the remaining sides that contain orthogonal feed lines. An open slot is introduced along the two sides of the square cavity with metallic vias to form a magnetic wall....

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• How high-tech solutions support the fight against IUU and ghost fishing: a review of innovative approaches, methods, and trends

  Publikacja

  • Z. Klawikowska
  • T. Ujazdowski
  • M. Grochowski
  • R. Piotrowski

  - IEEE Access - Rok 2022

  Illegal, Unreported, and Unregulated fishing is a major threat to human food supply and marine ecosystem health. Not only is it a cause of significant economic loss but also its effects have serious long-term environmental implications, such as overfishing and ocean pollution. The beginning of the fight against this problem dates since the early 2000s. From that time, a number of approaches and methods have been developed and reported....

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• Influence of User Mobility and Antenna Placement on System Loss in B2B Networks

  Publikacja

  • M. M. Ferreira
  • F. D. Cardoso
  • S. J. Ambroziak (dawniej: S. Ambroziak)
  • L. M. Correia

  - IEEE Access - Rok 2022

  In this paper, the influence of user mobility and on-body antenna placement on system loss in body-to-body communications in indoor and outdoor environments and different mobility scenarios is studied, based on system loss measurements at 2.45 GHz. The novelty of this work lies on the proposal of a classification model to characterise the effect of user mobility and path visibility on system loss, allowing to identify the best...

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• Landscape of Automated Log Analysis: A Systematic Literature Review and Mapping Study

  Publikacja

  • Ł. Korzeniowski
  • K. Goczyła

  - IEEE Access - Rok 2022

  Logging is a common practice in software engineering to provide insights into working systems. The main uses of log files have always been failure identification and root cause analysis. In recent years, novel applications of logging have emerged that benefit from automated analysis of log files, for example, real-time monitoring of system health, understanding users’ behavior, and extracting domain knowledge. Although nearly every...

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• Low-Loss Mechanically Tunable Resonator and Phase Shifters in Groove Gap Waveguide Technology

  Publikacja

  • A. Karami Horestani
  • Z. Shaterian
  • M. Mrozowski

  - IEEE Access - Rok 2022

  This research is focused on the design and realization of high-performance high-power variable phase shifters in groove gap waveguide technology. Specifically, it is shown that the unique characteristic of groove gap waveguides, which is its proper operation without the need for electrical connection between the top and bottom sections of the waveguide, can be used to design mechanically tunable devices. Using the proposed method,...

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• Low-Profile Interdigitated UHF RFID Tag Antenna for Metallic Objects

  Publikacja

  • F. Erman
  • D. Mansour
  • M. Kouali
  • A. Shabaneh
  • L. Leifsson
  • S. Kozieł
  • E. Hanafi

  - IEEE Access - Rok 2022

  This article presents a novel miniature interdigitated ultra-high frequency (UHF) radio frequency identification (RFID) tag antenna that can be placed on metallic objects. The tag structure comprises two horizontal strip lines, each loaded with seven identical open stubs, and an integrated circuit (IC) chip connected directly to the feed lines in the middle of the structure. The perfect match to the IC chip’s impedance is realized...

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• Magnetic Signature Description of Ellipsoid-Shape Vessel Using 3D Multi-Dipole Model Fitted on Cardinal Directions

  Publikacja

  • J. Tarnawski
  • T. A. Rutkowski (dawniej: T. Rutkowski)
  • M. Wołoszyn
  • A. Cichocki
  • K. Buszman

  - IEEE Access - Rok 2022

  The article presents a continuation of the research on the 3D multi-dipole model applied to the reproduction of magnetic signatures of ferromagnetic objects. The model structure has been modified to improve its flexibility - model parameters determined by optimization can now be located in the cuboid contour representing the object's hull. To stiffen the model, the training dataset was expanded to data collected from all four cardinal...

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• Miniaturized Metal-Mountable U-shaped Inductive-Coupling-Fed UHF RFID Tag Antenna with Defected Microstrip Surface

  Publikacja

  • F. Erman
  • S. Kozieł (dawniej: M. Kozieł)
  • E. Hanafi
  • R. Soboh
  • S. Szczepański

  - IEEE Access - Rok 2022

  This study presents a novel miniature ultra-high frequency (UHF) radio frequency identification (RFID) tag for metallic objects. Its arrangement includes a U-shaped feeder, which is inductively coupled to two E-type connected patches. Size reduction is achieved by means of utilizing the U-shaped feeder, and introducing a defection in the connection between the two E-type patches. The defection in the connection area between the...

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• Monolithic vs. Microservice Architecture: A Performance and Scalability Evaluation

  Publikacja

  • G. Blinowski
  • A. Ojdowska
  • A. Przybyłek

  - IEEE Access - Rok 2022

  Context. Since its proclamation in 2012, microservices-based architecture has gained widespread popularity due to its advantages, such as improved availability, fault tolerance, and horizontal scalability, as well as greater software development agility. Motivation. Yet, refactoring a monolith to microservices by smaller businesses and expecting that the migration will bring benefits similar to those reported by top global companies,...

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• Multi-Label Classification for AIS Data Anomaly Detection Using Wavelet Transform

  Publikacja

  • M. Szarmach
  • I. Czarnowski

  - IEEE Access - Rok 2022

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• Neural Approximators for Variable-Order Fractional Calculus Operators (VO-FC)

  Publikacja

  • B. Puchalski

  - IEEE Access - Rok 2022

  The paper presents research on the approximation of variable-order fractional operators by recurrent neural networks. The research focuses on two basic variable-order fractional operators, i.e., integrator and differentiator. The study includes variations of the order of each fractional operator. The recurrent neural network architecture based on GRU (Gated Recurrent Unit) cells functioned as a neural approximation for selected...

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• Numerically Efficient Miniaturization-Oriented Optimization of an Ultra-Wideband Spline-Parameterized Antenna

  Publikacja

  • A. Bekasiewicz
  • P. Kurgan
  • S. Kozieł

  - IEEE Access - Rok 2022

  Design of ultra-wideband radiators for modern handheld applications is a challenging task that involves not only selection of an appropriate topology, but also its tuning oriented towards balancing the electrical performance and size. In this work, a low-cost design of a compact, broadband, spline-parameterized monopole antenna has been considered. The framework used for the structure design implements trust-region-based methods,...

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• On Improved-Reliability Design Optimization of High-Frequency Structures Using Local Search Algorithms

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • P. Płotka

  - IEEE Access - Rok 2022

  The role of numerical optimization has been continuously growing in the design of high-frequency structures, including microwave and antenna components. At the same time, accurate evaluation of electrical characteristics necessitates full-wave electromagnetic (EM) analysis, which is CPU intensive, especially for complex systems. As rigorous optimization routines involve repetitive EM simulations, the associated cost may be significant....

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• Overview of Approaches for Compensating Inherent Metamaterials Losses

  Publikacja

  • B. Esmail
  • S. Kozieł
  • S. Szczepański
  • H. Majid

  - IEEE Access - Rok 2022

  Metamaterials are synthetic composite structures with extraordinary electromagnetic properties not readily accessible in ordinary materials. These media attracted massive attention due to their exotic characteristics. However, several issues have been encountered, such as the narrow bandwidth and inherent losses that restrict the spectrum and the variety of their applications. The losses have become the principal limiting factor...

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• Overview of Metamaterials-Integrated Antennas for Beam Manipulation Applications: The Two Decades of Progress

  Publikacja

  • B. Esmail
  • S. Kozieł
  • Ł. Gołuński
  • H. Majid
  • R. K. Barik

  - IEEE Access - Rok 2022

  Metamaterials (MMs) are synthetic composite structures with superior properties not found in naturally occurring materials. MMs have gained massive attention over the last two decades because of their extraordinary properties, such as negative permittivity and permeability. These materials enable many applications in communication subsystems, especially in the field of antenna design, to enhance gain, bandwidth, and efficiency,...

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• Overview of planar antenna loading metamaterials for gain performance enhancement: the two decades of progress

  Publikacja

  • B. Esmail
  • S. Kozieł
  • S. Szczepański

  - IEEE Access - Rok 2022

  Metamaterials (MTMs) are artificially engineered materials with unique electromagnetic properties not occurring in natural materials. MTMs have gained considerable attention owing to their exotic electromagnetic characteristics such as negative permittivity and permeability, thereby a negative refraction index. These extraordinary properties enable many practical applications such as super-lenses, and cloaking technology, and are...

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• QRS Morphology-Based EDR Signal—Factors Determining its Properties

  Publikacja

  • P. Przystup
  • A. Poliński
  • J. Wtorek

  - IEEE Access - Rok 2022

  Respiration-induced signals contain a clinically significant information. It could be obtained utilizing both direct and indirect methods. ECG-Derived Respiration (EDR) method is the latter one. However, in this case, two approaches could be distinguished. First one is based on determining changes in the morphology of QRS complexes while the second one is based on the Respiratory Sinus Arrhythmia (RSA) mechanism. The former approach...

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• Quality assessment of low voltage surge arresters

  Publikacja

  • L. Litzbarski
  • M. Olesz
  • S. Wojtas
  • M. J. Winiarski (dawniej: M. Winiarski)
  • T. Klimczuk
  • H. Glowinski
  • B. Andrzejewski

  - IEEE Access - Rok 2022

  Users expect reliable operation of the surge arrester during overvoltages, which may originate from a switching process or a lightning discharge. The necessary conditions to guarantee these expectations are: appropriate construction of the surge arrester, its production being maintained in accordance with technical standards, and a positive results of the type test (as well routine and acceptance tests). The recipient, especially...

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• Sensing Direction of Human Motion Using Single-Input-Single-Output (SISO) Channel Model and Neural Networks

  Publikacja

  • S. A. Bhat
  • M. A. Dar
  • P. Szczuko
  • D. Alyahya
  • F. Mustafa

  - IEEE Access - Rok 2022

  Object detection Through-the-Walls enables localization and identification of hidden objects behind the walls. While numerous studies have exploited Channel State Information of Multiple Input Multiple Output (MIMO) WiFi and radar devices in association with Artificial Intelligence based algorithms (AI) to detect and localize objects behind walls, this study proposes a novel non-invasive Through-the-Walls human motion direction...

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• Task Scheduling – Review of Algorithms and Analysis of Potential Use in a Biological Wastewater Treatment Plant

  Publikacja

  • T. Ujazdowski
  • R. Piotrowski

  - IEEE Access - Rok 2022

  The idea of task scheduling is to increase the efficiency of a system by minimising wasted time, evenly loading machines, or maximising the throughput of machines. Moreover, the use of appropriate scheduling algorithms often leads to a reduction in the energy costs of the process. Task scheduling problems are found in a variety of industrial areas, and their scale changes significantly depending on the problem. This review shows...

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• Wideband Highly-Selective Bandpass Filtering Branch-Line Coupler

  Publikacja

  • R. Barik
  • S. Kozieł
  • S. Szczepański

  - IEEE Access - Rok 2022

  This paper presents a novel design of a wideband highly-selective bandpass filtering branch-line coupler (FBLC). By integrating a coupled microstrip line, and an open-ended stub at each port of a single-section BLC, bandpass filtering characteristics with excellent selectivity and broad operating bandwidth have been achieved. The proposed circuit has been verified through EM simulations and physical measurements of the fabricated...

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Rok 2021

• A Model-Order Reduction Approach for Electromagnetic Problems With Nonaffine Frequency Dependence

  Publikacja

  • G. Fotyga

  - IEEE Access - Rok 2021

  The aim of this paper is to present a novel model-order reduction (MOR) technique for the efcient frequency-domain nite-element method (FEM) simulation of microwave components. It is based on the standard reduced-basis method, but the subsequent expansion frequency points are selected following the so-called sparsied greedy strategy. This feature makes it especially useful to perform a fast-frequency sweep of problems that lead...

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• A Novel Versatile Decoupling Structure and Expedited Inverse-Model-Based Re-Design Procedure for Compact Single-and Dual-Band MIMO Antennas

  Publikacja

  • M. Abdullah
  • S. Kozieł

  - IEEE Access - Rok 2021

  Multiple-input multiple-output (MIMO) antennas are considered to be the key components of fifth generation (5G) mobile communications. One of the challenges pertinent to the design of highly integrated MIMO structures is to minimize the mutual coupling among the antenna elements. The latter arises from two sources, the coupling in the free space and the coupling currents propagating on a ground plane. In this paper, an array of...

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• A Qualitative Study on Non-functional Requirements in Agile Software Development

  Publikacja

  • A. Jarzębowicz
  • P. Weichbroth

  - IEEE Access - Rok 2021

  Widespread use of agile software development (ASD) methods can be observed nowadays. Non-functional requirements (NFRs) are often reported to be a problematic issue for agile projects, since ASD methods tend to neglect NFRs while focusing on incremental delivery of functional features. Despite that, only very few studies have explored the requirements engineering practices used in ASD and dedicated particularly to NFRs. Objective:...

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• A Single-Carrier-Based Pulse-Width Modulation Template for Cascaded H-Bridge Multilevel Inverters

  Publikacja

  • C. I. Odeh
  • A. Lewicki
  • M. Morawiec

  - IEEE Access - Rok 2021

  Multiplicity of the triangular carrier signals is a criterion for the extension of sinusoidal pulsewidth modulation, SPWM, to a number of output voltage levels per phase-leg in cascaded H-bridge (CHB) multilevel inverter (MLI). Considering medium and high voltage applications where appreciable number of output voltage levels from CHB MLI is needed, commensurate high number of carrier signals in either classical level- or phase-shifted...

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• A Wideband Channel Model for Body Area Networks in Circular Metallic Indoor Environments

  Publikacja

  • F. D. Cardoso
  • M. M. Ferreira
  • S. J. Ambroziak (dawniej: S. Ambroziak)
  • L. M. Correia

  - IEEE Access - Rok 2021

  In this paper, the wideband characterization of the propagation channel in circular metallic indoor environments is addressed, regarding Body Area Networks and 5G small cells, an analytical model for the dependence of the mean delay and the average delay spread on the circle radius, the working frequency and the distance between the transmitter and the receiver being proposed. The derivation of the model is initially done analytically,...

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• Accurate Modeling of Frequency Selective Surfaces Using Fully-Connected Regression Model with Automated Architecture Determination and Parameter Selection Based on Bayesian Optimization

  Publikacja

  • N. Calik
  • M. Belen
  • P. Mahouti
  • S. Kozieł

  - IEEE Access - Rok 2021

  Surrogate modeling has become an important tool in the design of high-frequency structures. Although full-wave electromagnetic (EM) simulation tools provide an accurate account for the circuit characteristics and performance, they entail considerable computational expenditures. Replacing EM analysis by fast surrogates provides a way to accelerate the design procedures. Unfortunately, modeling of microwave passives is a challenging...

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• Assessment of Connectivity-based Resilience to Attacks Against Multiple Nodes in SDNs

  Publikacja

  • D. Santos
  • A. de Sousa
  • C. Mas-Machuca
  • J. Rak

  - IEEE Access - Rok 2021

  In Software Defined Networks (SDNs), the control plane of a network is decoupled from its data plane. For scalability and robustness, the logically centralized control plane is implemented by physically placing different controllers throughout the network. The determination of the number and placement of controllers is known as the Controller Placement Problem (CPP). In the regular (i.e., failure-free) state, the control plane...

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• Can Web Search Queries Predict Prices Change on the Real Estate Market?

  Publikacja

  • N. Rizun
  • A. Baj-Rogowska

  - IEEE Access - Rok 2021

  This study aims to explore whether the intensity of internet searches, according to the Google Trends search volume index (SVI), is a predictor of changes in real estate prices. The motivation of this study is the possibility to extend the understanding of the extra predictive power of Google search engine query volume of future housing price change (shift direction) by (i) the introduction of a research approach that combines...

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• Concurrent Video Denoising and Deblurring for Dynamic Scenes

  Publikacja

  • E. Katsaros
  • P. Kopa Ostrowski
  • D. Węsierski
  • A. Jezierska (dawniej: A. Jezierska)

  - IEEE Access - Rok 2021

  Dynamic scene video deblurring is a challenging task due to the spatially variant blur inflicted by independently moving objects and camera shakes. Recent deep learning works bypass the ill-posedness of explicitly deriving the blur kernel by learning pixel-to-pixel mappings, which is commonly enhanced by larger region awareness. This is a difficult yet simplified scenario because noise is neglected when it is omnipresent in a wide...

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• Decoupled Kalman filter based identification of time-varying FIR systems

  Publikacja

  • M. Ciołek
  • M. Niedźwiecki
  • A. Gańcza

  - IEEE Access - Rok 2021

  When system parameters vary at a fast rate, identification schemes based on model-free local estimation approaches do not yield satisfactory results. In cases like this, more sophisticated parameter tracking procedures must be used, based on explicit models of parameter variation (often referred to as hypermodels), either deterministic or stochastic. Kalman filter trackers, which belong to the second category, are seldom used in...

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• Design Evolution of the Ultrasonic Piezoelectric Motor Using Three Rotating Mode Actuators

  Publikacja

  • R. Ryndzionek
  • Ł. Sienkiewicz
  • M. Michna
  • M. Chodnicki

  - IEEE Access - Rok 2021

  The development process and experimental investigation of the multicell piezoelectric motor is presented in this paper. The proposed design consists of three individual cells integrated into the stator, double rotor, and a preload system. Those elements are combined into a symmetrical structure of the motor. The two new prototypes have been designed, simulated and tested. Finite element numerical analysis is carried out to obtain...

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• Design of a compact planar transmission line for miniaturized rat-race coupler with harmonics suppression

  Publikacja

  • A. Lalbakhsh
  • G. Mohamadpour
  • S. Roshani
  • M. Ami
  • S. Roshani
  • A. S. Sayem
  • M. Alibakhshikenari
  • S. Kozieł

  - IEEE Access - Rok 2021

  This paper presents an elegant yet straightforward design procedure for a compact rat-race coupler (RRC) with an extended harmonic suppression. The coupler’s conventional λ/4 transmission lines (TLs) are replaced by a specialized TL that offers significant size reduction and harmonic elimination capabilities in the proposed approach. The design procedure is verified through the theoretical, circuit, and electromagnetic (EM) analyses,...

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• Design of a Patch Power Divider with Simple Structure and Ultra-Broadband Harmonics Suppression

  Publikacja

  • S. Roshani
  • S. Kozieł
  • S. Roshani
  • M. Jamshidi
  • F. Parandin
  • S. Szczepański

  - IEEE Access - Rok 2021

  This paper introduces a simple H-shaped patch Wilkinson power divider (WPD), which provides ultra wide harmonics suppression band. The presented WPD designed at 1.8 GHz, and exhibits good performance at the operating bandwidth. In the proposed divider structure, two simple patch low-pass filters (LPFs) are employed at each branch, and three open ended stubs are added at each port. The proposed divider, implemented using the aforementioned...

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• Design of High-Performance Scattering Metasurfaces through Optimization-Based Explicit RCS Reduction

  Publikacja

  • S. Kozieł
  • M. Abdullah
  • S. Szczepański

  - IEEE Access - Rok 2021

  The recent advances in the development of coding metasurfaces created new opportunities in realization of radar cross section (RCS) reduction. Metasurfaces, composed of optimized geometries of meta-atoms arranged as periodic lattices, are devised to obtain desired electromagnetic (EM) scattering characteristics. Despite potential benefits, their rigorous design methodologies are still lacking, especially in the context of controlling...

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• Designing RBFNs Structure Using Similarity-Based and Kernel-Based Fuzzy C-Means Clustering Algorithms

  Publikacja

  • I. Czarnowski
  • J. Jedrzejowicz
  • P. Jedrzejowicz

  - IEEE Access - Rok 2021

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• eFRADIR: An Enhanced FRAmework for DIsaster Resilience

  Publikacja

  • A. Pasic
  • R. Girao-Silva
  • F. Mogyorosi
  • B. Vass
  • T. Gomes
  • P. Babarczi
  • P. Revisnyei
  • J. Tapolcai
  • J. Rak

  - IEEE Access - Rok 2021

  This paper focuses on how to increase the availability of a backbone network with minimal cost. In particular, the new framework focuses on resilience against natural disasters and is an evolution of the FRADIR/FRADIR-II framework. It targets three different directions, namely: network planning, failure modeling, and survivable routing. The steady state network planning is tackled by upgrading a sub-network (a set of links termed...

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