Wyniki wyszukiwania dla: ANTENA DWUSTOŻKOWA

• Expedited optimization of antenna input characteristics with adaptive Broyden updates

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - ENGINEERING COMPUTATIONS - Rok 2020

  Simulation-driven adjustment of geometry and/or material parameters is a necessary step in the design of contemporary antenna structures. Due to their topological complexity, other means, such as supervised parameter sweeping, does not usually lead to satisfactory results. On the other hand, rigorous numerical optimization is computationally expensive due to a high cost of underlying full-wave electromagnetic (EM) analyses, otherwise...

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• Compact Dual-Polarized Corrugated Horn Antenna for Satellite Communications

  Publikacja

  • M. Saeed
  • S. Kozieł
  • L. Leifsson

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2020

  In this paper, a structure and design procedure of a novel compact dual-polarized corrugated horn antenna with high gain and a stable phase center for satellite communication is presented. The antenna incorporates an Ortho-Mode Transducer (OMT), a mode converter, and a corrugated structure. The compact OMT section is designed to be fed by standard WR-75 waveguides. The proposed compact design utilizes only ten corrugated slots...

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• A Broadband Circularly Polarized Wide-Slot Antenna with a Miniaturized Footprint

  Publikacja

  • U. Ullah
  • S. Kozieł

  - IEEE Antennas and Wireless Propagation Letters - Rok 2018

  This letter presents a novel and simple feeding technique for exciting orthogonal components in a wide-slot antenna. In this technique, a rectangular bracket-shape parasitic strip is placed at the open end of the straight microstrip line to excite the fundamental horizontal and vertical components of the circular polarization (CP). The proposed technique—when employed in conjunction with the asymmetrical geometry of coplanar waveguide...

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• Dimensionality-Reduced Antenna Modeling with Stochastically Established Constrained Domain

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - KNOWLEDGE-BASED SYSTEMS - Rok 2023

  Over the recent years, surrogate modeling methods have become increasingly widespread in the design of contemporary antenna systems. On the one hand, it is associated with a growing awareness of numerical optimization, instrumental in achieving high-performance structures. On the other hand, considerable computational expenses incurred by massive full-wave electromagnetic (EM) analyses, routinely employed as a major design tool,...

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• Influence of Dielectric Overlay Dimensions on Performance of Miniaturized ESPAR Antenna

  Publikacja

  • M. Czeleń
  • M. Rzymowski
  • K. Nyka
  • Ł. Kulas

  - Rok 2020

  In this paper, the influence of dielectric overlay size on miniaturized ESPAR antenna performance has been investigated. The dielectric overlay’s main function is antenna’s size reduction but it can also be used to modify its radiation pattern. This creates the possibility of easy adopting antenna parameters to different applications by swapping used overlay. In particular, the lowering of antenna’s main beam elevation direction...

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• Tolerance Optimization of Antenna Structures by Means of Response Feature Surrogates

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2022

  Fabrication tolerances and other types of uncertainties, e.g., the lack of precise knowledge of material parameters, have detrimental effects on electrical and field performance of antenna systems. In the case of input characteristics these are particularly noticeable for narrow- and multi-band antennas where deviations of geometry parameters from their nominal values lead to frequency shifts of the operating frequency bands. Improving...

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• On geometry parameterization for simulation-driven design closure of antenna structures

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - Scientific Reports - Rok 2021

  Full-wave electromagnetic (EM) simulation tools have become ubiquitous in antenna design, especially final tuning of geometry parameters. From the reliability standpoint, the recommended realization of EM-driven design is through rigorous numerical optimization. It is a challenging endeavor with the major issues related to the high computational cost of the process, but also the necessity of handling several objectives and constraints...

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• Adaptive Wavelet-Based Correction of Non-Anechoic Antenna Measurements

  Publikacja

  • A. Bekasiewicz
  • V. Waladi
  • M. Wójcikowski
  • T. Dhaene

  - Rok 2023

  Non-anechoic measurements represent an affordable alternative to evaluation of antenna performance in expensive, dedicated facilities. Due to interferences and noise from external sources of EM radiation, far-field results obtained in non-ideal conditions require additional post-processing. Conventional correction algorithms rely on manual tuning of parameters, which make them unsuitable for reliable testing of prototypes. In this...

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• Review of Recent Advancement on Nature/Bio-inspired Antenna Designs

  Publikacja

  • F. Azam
  • S. Shah
  • S. Bashir
  • S. Kozieł

  - IEEE Access - Rok 2024

  This article presents an extensive examination of antennas rooted in nature and biology, showcasing their remarkable performance across a wide spectrum of frequencies—from microwave to terahertz. The limitations of traditional antenna design have become increasingly evident in the face of burgeoning demands for novel communication technologies. Conventional analytical-equation-based approaches struggle to deliver the combined performance...

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• Performance-Based Nested Surrogate Modeling of Antenna Input Characteristics

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2019

  Utilization of electromagnetic (EM) simulation tools is mandatory in the design of contemporary antenna structures. At the same time, conducting designs procedures that require multiple evaluations of the antenna at hand, such as parametric optimization or yield-driven design, is hindered by a high cost of accurate EM analysis. To certain extent, this issue can be addressed by utilization of fast replacement models (also referred...

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• Asymmetrical-Slot Antenna with Enhanced Gain for Dual-Band Applications

  Publikacja

  • A. Bekasiewicz
  • S. Kozieł

  - Rok 2019

  Dual-band operation is an important feature of antennas to be applied in modern communication systems. Although high gain of radiators is rarely of concern in urban areas with densely located broadcasting stations, it becomes crucial for systems operating in more remote environments. In this work, a dual-band antenna with enhanced bandwidth is proposed. The structure consists of a driven element in the form of an asymmetrical radiator/slot...

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• Expedited antenna optimization with numerical derivatives and gradient change tracking

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - ENGINEERING COMPUTATIONS - Rok 2020

  Design automation has been playing an increasing role in the development of novel antenna structures for various applications. One of its aspects is electromagnetic (EM)-driven design closure, typically applied upon establishing the antenna topology, and aiming at adjustment of geometry parameters to boost the performance figures as much as possible. Parametric optimization is often realized using local methods given usually reasonable...

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• ESPAR Antenna-Based WSN Node With DoA Estimation Capability

  Publikacja

  • M. Groth
  • M. Rzymowski
  • K. Nyka
  • Ł. Kulas

  - IEEE Access - Rok 2020

  In this paper, we present a low-cost energy-efficient electronically steerable parasitic array radiator (ESPAR) antenna-based wireless sensor network (WSN) node designed for IEEE 802.15.4 standard that is capable of performing direction of arrival (DoA) estimation in real-life outdoor environments. To this end, we propose the WSN node architecture, design and realization that utilizes NXP JN5168 radio frequency (RF) wireless transceiver...

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• Frequency-Based Regularization for Improved Reliability Optimization of Antenna Structures

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • M. Al-hasan

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2021

  The paper proposes a modified formulation of antenna parameter tuning problem. The main ingredient of the presented approach is a frequency-based regularization. It allows for smoothening the functional landscape of the assumed cost function, defined to encode the prescribed design specifications. The regularization is implemented as a special penalty term complementing the primary objective and enforcing the alignment of the antenna...

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• Detection and Mitigation of GPS Spoofing Based on Antenna Array Processing

  Publikacja

  • J. Magiera
  • R. Katulski

  - Journal of Applied Research and Technology - Rok 2015

  In this article authors present an application of spatial processing methods for GPS spoofing detection and mitigation. In the first part of this article, a spoofing detection method, based on phase delay measurements, is proposed. Accuracy and precision of phase delay estimation is assessed for various qualities of received signal. Spoofing detection thresholds are determined. Efficiency of this method is evaluated in terms of...

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• Some Aspects in the Model of a Wire Antenna by Using the Mathcad Language

  Publikacja

  • P. Jankowski
  • J. Horiszny
  • M. Wołoszyn

  - Rok 2005

  W artykule omówiono możliwość modelowania anteny prętowej przy wykorzystaniu programu Mathcad. Przedstawiono sposób rozwiązywania równania różniczkowo-całkowego na przykładzie równania Pocklingtona. Artykuł zawiera szczegółowy opis modelu, uzyskane wyniki obliczeniowe i wnioski na temat użyteczności metody i problemów związanych ze zbieżnością zastosowanych algorytmów numerycznych.

• 3D Form analysis of rope deformation with long towed underwater hydroacoustic antenna

  Publikacja

  • J. Bielański

  - Archives of Civil and Mechanical Engineering - Rok 2007

  Artykuł opisuje rozwiązanie zagadnienia brzegowego dla zestawu długiej liny holującej i podwodnej anteny hydroakustycznej o gęstości, tej ostatniej, nieznacznie większej od gęstości wody i małej sztywności. Znane jest tylko położenie punktu zamocowania liny do okrętu (p-kt początkowy holowanego zestawu) oraz głębokość, na której znajduje się koniec anteny. Przedstawiono analizę sił działających na holowany zestaw, ich równania...

• Application of hybrid radiation modes of microstrip line in rectangular patch antenna design

  Publikacja

  • W. Zieniutycz

  - Rok 2007

  W pracy przedstawiono metodę wykorzystania hybrydowych rodzajów promieniujących linii mikropaskowej do projektowania anten mikropaskowych. Pokazano,że pojedynczy rodzaj promieniujący można wykorzystać do przybliżonego opisu pola promieniowania anteny mikropaskowej. Zamieszczono wyniki symulacji potwierdzające zadowalającą dokładność przybliżenia w przypadku obliczeń częstotliwości środkowych pracy anteny oraz rezystancji promieniowania...

• Miniaturization of ESPAR Antenna Using Low-Cost 3D Printing Process

  Publikacja

  • M. Czeleń
  • M. Rzymowski
  • K. Nyka
  • Ł. Kulas

  - Rok 2020

  In this paper, the miniaturized electronically steerable parasitic array radiator (ESPAR) antenna is presented. The size reduction was obtained by embedding its active and passive elements in polylactic acid (PLA) plastic material commonly used in low-cost 3D printing. The influence of 3D printing process imperfections on the ESPAR antenna design is investigated and a simple yet effective method to...

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• A Study on Dual-band Microstrip Rectangular Patch Antenna for Wi-Fi

  Publikacja

  • S. Zahra

  - Rok 2020

• Filtrujące struktury EBG w układzie zasilania planarnej anteny szczelinowej

  Publikacja

  • P. Kurgan
  • A. Bekasiewicz
  • T. Żelaziński
  • M. Kitliński

  - Rok 2011

  W referacie zaprezentowano zminiaturyzowaną, dwuzakresową antenę szczelinową zasilaną poprzez linię koplanarną zawierającą filtrujące struktury EBG. Szerokopasmową antenę szczelinową o konwencjonalnej topografii zmodyfikowano umieszczając prostą komórkę EBG w układzie zasilania anteny, otrzymując w rezultacie dwa zakresy pracy struktury antenowej: 2.5 ÷ 5.3 GHz oraz 13.5 ÷ 16.3 GHz, przy współczynniku fali stojącej WFS≤2. Wyniki...

• Filtrujące struktury ebg w układzie zasilania planarnej anteny szczelinowej

  Publikacja

  • P. Kurgan
  • A. Bekasiewicz
  • T. Żelaziński
  • M. Kitliński

  - Elektronika : konstrukcje, technologie, zastosowania - Rok 2011

  W pracy zaprezentowano koncepcję miniaturyzacji systemu nadawczo/odbiorczego polegającą na wprowadzeniu filtrujących struktur EBG (ang. Electromagnetic BandGap) w torze zasilania anteny, dzięki czemu możliwa jest eliminacja dodatkowego komponentu filtrującego. Rozważono szerokopasmową antenę szczelinową o konwencjonalnej topografii, którą następnie zmodyfikowano poprzez umieszczenie w układzie zasilania prostej, pasmowo-zaporowej...

• Formy zobrazowań w sonarze dalekiego zasięgu z cylindryczną anteną

  Publikacja

  • A. Raganowicz
  • L. Kilian
  • J. Marszal
  • Z. Ostrowski
  • A. Schmidt
  • J. Schmidt

  - Rok 2007

  W artykule zaprezentowane są formy zobrazowań zastosowanych w dalekosiężnym, pasywnym sonarze z holowaną anteną, zmodernizowanym w Katedrze Systemów Elektroniki Morskiej. We wstępie pokazano strukturę sonaru po modernizacji oraz formy sygnałów nasłuchu, ich przetwarzania i transmisji z anteny do zespołów pokładowych. W dalszych częściach pokazano organizację przepływu informacji wewnątrz sonaru i przy komunikacji z zewnętrznymi...

• Receiver block of antenna amplifier for WLAN systems in 5 GHz band

  Publikacja

  • W. Jesionowski
  • K. Nyka

  - Rok 2006

  Dwukierunkowe wzmacniacze antenowe (BDA) są często stosowane do zwiększania zasięgu łączności w sieciach bezprzewodowych WLAN. W artykule przedstawiono teorię, procedurę projektową oraz realizację części odbiorczej dwukierunkowego wzmacniacza do systemów WLAN na pasma 5GHz w standardach 802.11a i HiperLAN-2. Analizowano tylko te bloki, które wpływają na parametry toru odbiorczego. Aby ograniczyć koszt wzmacniacza wszystkie obwody...

• Enhancing Performance of Switched Parasitic Antenna for Localization in Wireless Sensor Networks

  Publikacja

  • M. Rzymowski
  • K. Nyka
  • Ł. Kulas

  - Rok 2012

  This paper presents an Electronically Steerable Parasitic Array Radiator (ESPAR) antenna with enhanced performance of estimating the incoming signal direction. Designed antenna is dedicated for 2.4 GHz ISM applications with emphasis on Wireless Sensor Networks (WSN). The limitations of the existing design approach are illustrated, as well as perspectives and challenges of the proposed solution in relation to the localization in...

• Expedited design of microstrip antenna subarrays using surrogate-based optimization

  Publikacja

  • S. Kozieł
  • S. Ogurtsov
  • W. Zieniutycz
  • Ł. Sorokosz

  - IEEE Antennas and Wireless Propagation Letters - Rok 2014

  Computationally efficient simulation-driven design of microstrip antenna subarrays is presented. The proposed design approach aims at simultaneous adjustment of all relevant geometry parameters of the subarray, which allows us to take into account the effect of the feeding network on the subarray radiation pattern (in particular, the side lobe level, SLL). In order to handle a large number of variables involved in the design process,...

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• Design of microstrip antenna subarrays: a simulation-driven surrogate-based approach

  Publikacja

  • A. Bekasiewicz
  • W. Zieniutycz
  • S. Kozieł
  • S. Ogurtsov

  - Rok 2014

  A methodology for computationally efficient simulation-driven design of microstrip antenna subarrays is presented. Our approach takes into account the effect of the feed (here, a corporate network) on the subarray side-lobe level and allows adjustment of both radiation and reflection responses of the structure under design within a single automated process. This process is realized as surrogate-based optimization that produces...

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• Novel Structure and EM-Driven Design of Small UWB Monopole Antenna

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz

  - Rok 2014

  A novel structure of a small UWB monopole antenna is presented. In our approach, a compact size is achieved by means of a meander line for current path enlargement as well as the two parameterized slits that introduce additional degrees of freedom helping to ensure good impedance matching. The antenna design is carried out using surrogate-based optimization involving variable-fidelity EM simulations. This allows us to simultaneously...

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• Improved jamming resistance using electronically steerable parasitic antenna radiator

  Publikacja

  • M. Tarkowski
  • M. Rzymowski
  • K. Nyka
  • Ł. Kulas

  - Rok 2017

  This paper presents an idea of using an Electronically Steerable Parasitic Antenna Radiator (ESPAR) for jamming suppression in IEEE 802.11b networks. Jamming (intentional interference) attacks are known to be effective and easy to perform, which may impose connectivity problems in applications concerning Internet of Things (IoT). In our paper, theoretical considerations are presented and the results of experiments performed in...

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• Direction-of-Arrival Estimation Using an ESPAR Antenna with Simplified Beam Steering

  Publikacja

  • Ł. Kulas

  - Rok 2017

  In this paper, it has been shown, how electronically steerable parasitic array radiator (ESPAR) antenna, in which beam steering is done in a simple way, can be used for directionof- arrival (DoA) estimation of an unknown signal impinging the antenna. The concept is based on an ESPAR antenna having twelve parasitic elements, in which beam switching is realized by RF switches providing required loads to its parasitic elements. Numerical...

• Simple 2-D Direction-of-Arrival Estimation Using an ESPAR Antenna

  Publikacja

  • Ł. Kulas

  - IEEE Antennas and Wireless Propagation Letters - Rok 2017

  In this letter, it has been shown how an electronically steerable parasitic array radiator (ESPAR) antenna can be used for 2-D direction-of-arrival (DoA) estimation employing received signal strength (RSS) values only. The proposed approach relies on changes in RSS values recorded at the antenna output port observed for different vertical and horizontal directions, while antenna’s main beam sweeps 360° area around the ESPAR antenna. Based...

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• On Reduced-Cost Design-Oriented Constrained Surrogate Modeling of Antenna Structures

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz

  - IEEE Antennas and Wireless Propagation Letters - Rok 2016

  Design of contemporary antenna structures heavily relies on full-wave electromagnetic (EM) simulation models. Such models are essential to ensure reliability of evaluating antenna characteristics, yet, they are computationally expensive and therefore unsuitable for handling tasks that require multiple analyses, e.g., parametric optimization. The cost issue can be alleviated by using fast surrogate models. Conventional data-driven...

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• A structure and simulation-driven design of compact CPW-fed UWB antenna

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz

  - IEEE Antennas and Wireless Propagation Letters - Rok 2016

  In this letter, a structure of a miniaturized ultra-wideband CPW-fed antenna and its design proce-dure are presented. The antenna is a modified version of the design previously proposed in the literature, with additional degrees of freedom introduced in order to improve the structure flexibility. The small size is achieved by executing a rigorous optimization procedure that consists of two stages: (i) smart random search carried...

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• Rapid EM-driven antenna dimension scaling through inverse modeling

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz
  • L. Leifur

  - IEEE Antennas and Wireless Propagation Letters - Rok 2016

  In this letter, a computationally feasible technique for dimension scaling of antenna structures is introduced. The proposed methodology is based on inverse surrogate modeling where the geometry parameters of the antenna structure of interest are explicitly related to the operating frequency. The surrogate model is identified based on a few antenna designs optimized for selected reference frequencies. For the sake of computational...

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• A Conformal Circularly Polarized Series-Fed Microstrip Antenna Array Design

  Publikacja

  • S. Ogurtsov
  • S. Kozieł

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2020

  A conformal circularly polarized series-fed microstrip array design for broadside radiation is presented. The array aperture under design is conformal to a cylindrical surface of a given radius. The approach we present primarily addresses focusing of the circularly polarized major lobe of the conformal array by proper dimensioning of the aperture spacings. The proposed analytical models yield the values of the element spacings...

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• Enhanced-Performance Circularly Polarized MIMO Antenna with Polarization/Pattern Diversity

  Publikacja

  • U. Ullah
  • I. Mabrouk
  • S. Kozieł

  - IEEE Access - Rok 2020

  Design of a compact wideband circularly polarized (CP) multiple-input multiple-output (MIMO) antenna with polarization diversity is proposed and characterized for off-body communication. The antenna is based on a simple coplanar waveguide (CPW)-fed monopole extension of the microstrip line. The orthogonal field components required by CP are induced using a simply modified right/left side ground plane. In particular, a stub extending...

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• Miniaturized uniplanar triple-band slot dipole antenna with folded radiator

  Publikacja

  • A. Bekasiewicz
  • S. Kozieł

  - MICROWAVE AND OPTICAL TECHNOLOGY LETTERS - Rok 2018

  A miniaturized uniplanar slot dipole for triple-frequency operation is presented. The antenna consists of a folded slot radiator with an increased number of degrees of freedom that allow for efficient size reduction. Rigorous electromagnetic (EM)-driven design optimization is applied in order to achieve the smallest possible size while maintaining acceptable levels of antenna reflection at the required operating frequencies. The...

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• Three-objective antenna optimization by means of kriging surrogates and domain segmentation

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz

  - Rok 2018

  In this paper, an optimization framework for multi-objective design of antenna structures is discussed which exploits data-driven surrogates, a multi-objective evolutionary algorithm, response correction techniques for design refinement, as well as generalized domain segmentation. The last mechanism is introduced to constrain the design space region subjected to sampling, which permits reduction of the number of training data samples...

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• Topological modifications for performance improvement and size reduction of wideband antenna structures

  Publikacja

  • A. Bekasiewicz
  • S. Kozieł

  - Rok 2018

  Compact antennas belong to the key components of modern communication systems. Their miniaturization is often achieved by introducing appropriate topological changes such as simple ground plane slots or tapered feeds. More sophisticated modifications are rarely considered in the literature because they normally lead to significant increase of the number of tunable parameters, which makes the antenna design process more challenging....

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• Obliczenia geometrii elementów stalowych konstrukcji montażowej anteny TV Trzeciewiec.

  Publikacja

  • A. Olszewski

  - Rok 2011

  W pracy wykonano analizę naprężeń w montażowej konstrukcji stalowej masztu TV Trzeciewiec.

• 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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• Robust Parameter Tuning of Antenna Structures by Means of Design Specification Adaptation

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2021

  Parameter tuning through numerical optimization has become instrumental in the design of high-performance antenna systems. Yet, practical optimization faces several major challenges, including high cost of massive evaluations of antenna characteristics, normally involving full-wave electromagnetic (EM) analysis, large numbers of adjustable variables, the shortage of reasonable initial solutions in the case of topologically complex...

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• Calibration-Free Single-Anchor Indoor Localization Using an ESPAR Antenna

  Publikacja

  • M. Groth
  • K. Nyka
  • Ł. Kulas

  - SENSORS - Rok 2021

  In this paper, we present a novel, low-cost approach to indoor localization that is capable of performing localization processes in real indoor environments and does not require calibration or recalibration procedures. To this end, we propose a single-anchor architecture and design based on an electronically steerable parasitic array radiator (ESPAR) antenna and Nordic Semiconductor nRF52840 utilizing Bluetooth Low Energy (BLE)...

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• Optimization-based antenna miniaturization using adaptively-adjusted penalty factors

  Publikacja

  • M. Mahrokh
  • S. Kozieł

  - Electronics - Rok 2021

  The continuing trend for miniaturization of electronic devices necessitates size reduction of the comprising components and circuitry. Specifically, integrated circuit-antenna modules therein require compact radiators in applications such as 5G communications, implantable and on-body devices, or internet of things (IoT). The conflict between the demands for compact size and elec-trical and field performance can be mitigated by...

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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
  • 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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• Two-Row ESPAR Antenna with Simple Elevation and Azimuth Beam Switching

  Publikacja

  • M. Rzymowski
  • Ł. Kulas

  - IEEE Antennas and Wireless Propagation Letters - Rok 2021

  In this letter, we propose a two-row electronically steerable parasitic array radiator (ESPAR) antenna designed for direction of arrival (DoA) estimation in Internet of Things (IoT) applications relying on simple microcontrollers. The antenna is capable of elevation and azimuth beam switching using a simple microcontroller-oriented steering circuit and provides 18 directional radiation patterns, which can be grouped in 3 distinctive...

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• Generalized Formulation of Response Features for Reliable Optimization of Antenna Input Characteristics

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2022

  Electromagnetic (EM)-driven parameter adjustment has become imperative in the design of modern antennas. It is necessary because the initial designs rendered through topology evolution, parameter sweeping, or theoretical models, are often of poor quality and need to be improved to satisfy stringent performance requirements. Given multiple objectives, constraints, and a typically large number of geometry parameters, the design closure...

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• On EM-driven size reduction of antenna structures with explicit constraint handling

  Publikacja

  • A. Pietrenko-Dąbrowska
  • S. Kozieł

  - IEEE Access - Rok 2021

  Simulation-driven miniaturization of antenna components is a challenging task mainly due to the presence of expensive constraints, evaluation of which involves full-wave electromagnetic (EM) analysis. The recommended approach is implicit constraint handling using penalty functions, which, however, requires a meticulous selection of penalty coefficients, instrumental in ensuring optimization process reliability. This paper proposes...

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• Substrate Integrated Waveguide-Based Frequency-Tunable Self-Octaplexing Antenna

  Publikacja

  • N. Pradhan
  • S. Kozieł
  • K. Subramanian

  - AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS - Rok 2024

  This communication presents the first-ever substrate integrated waveguide (SIW)-based frequency-tunable self-octaplexing antenna (SOA) for wireless communication. The structure is arranged by implementing eight distinct patches with planar 50-ohm feedlines at the top of the SIW cavity, which realize eight distinct resonant frequencies. Independent tuning of each resonant frequency is achieved by incorporating appropriately allocated...

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• Multi-Taper-Based Automatic Correction of Non-Anechoic Antenna Measurements

  Publikacja

  • M. Dzwonkowski
  • V. Waladi
  • A. Bekasiewicz

  - METROLOGIA - Rok 2024

  Prototype measurements belong to the key steps in the development of antenna structures. Although accurate validation of their far-field performance can be realized in dedicated facilities, such as anechoic chambers, the high cost of their construction and maintenance might not be justified if the main goal of measurements is to support teaching or low-budget research. Instead, they can be performed in non-anechoic conditions and...

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