Wyniki wyszukiwania dla: MILLIMETER-WAVE ANTENNA - MOST Wiedzy

Wyszukiwarka

Wyniki wyszukiwania dla: MILLIMETER-WAVE ANTENNA

Wyniki wyszukiwania dla: MILLIMETER-WAVE ANTENNA

  • Five-phase induction motor drive with sine-wave filter

    Publikacja

    - Rok 2014

    The paper presents closed loop ac drive with 5 phase induction motor operating with voltage source inverter and sine wave filter. The motor supply voltages and currents have sinusoidal shape. For well known adjustable electric drives the field oriented control method with flux and speed co ntrol can be applied. In the presence of output filter both control and estimation algorithms should be modified due to sine wave filter installation....

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Extraction of antenna pattern from near field antenna measurements distorted by undesired emission

    In this paper authors present experimental correction of antenna pattern obtained from near field measurements when they are distorted by determined electromagnetic emission. Such situation may be met e.g. when feeding or supply subsystem interacts with antenna radiation pattern due to self-emission. Presented results of experiments show effectiveness of extraction of antenna pattern utilizing near field antenna measurements.

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Antenna technique in space application - 22/23

    Kursy Online
    • W. Zieniutycz

  • Recent Advances in Accelerated Multi-Objective Design of High-Frequency Structures using Knowledge-Based Constrained Modeling Approach

    Design automation, including reliable optimization of engineering systems, is of paramount importance for both academia and industry. This includes the design of high-frequency structures (antennas, microwave circuits, integrated photonic components), where the appropriate adjustment of geometry and material parameters is crucial to meet stringent performance requirements dictated by practical applications. Realistic design has...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Expedited Yield-Driven Design of High-Frequency Structures by Kriging Surrogates in Confined Domains

    Publikacja

    Uncertainty quantification is an important aspect of engineering design, also pertaining to the development and performance evaluation of high-frequency structures systems. Manufacturing tolerances as well as other types of uncertainties, related to material parameters (e.g., substrate permittivity) or operating conditions (e.g., bending) may affect the characteristics of antennas or microwave devices. For example, in the case...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Physics of Wave Phenomena

    Czasopisma

    ISSN: 1541-308X , eISSN: 1934-807X

  • Measurement system based on USB Z-Wave controller

    A wireless measurement system based on the Z-Wave standard is presented in this paper. The system is composed of a U SB Z-Stick Gen5 controller connected to a Personal Computer and a Fibaro controller FGRGBWM-441. Operation of the system is controlled by software written in C++ using OpenZWave library. Some metrological aspects of the system are evaluated: accuracy, linearity, resolution and frequency of voltage measurements.

    Pełny tekst do pobrania w portalu

  • Elliptical slot UWB monopole antenna

    Publikacja

    The UWB monopole antenna with elliptical radiating slot end and microstrip feeding line terminated with radial stub have been designed, fabricated and measured. The antenna show return loss less than -12 dB in the whole UWB bandwidth. Linearity of the reflection coefficient phase product have also been achieved. Radiation patterns of the antenna measured at three selected frequency points indicated regular, approximately omni directional...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Measurements of electrically small antenna radiation patterns in non-anechoic environments using TGM

    Dane Badawcze
    open access

    The dataset contains raw and processed measurements of radiation pattern characteristics performed in non-anechoic regime for four antenna structures: a spline-parameterized Vivaldi structure, a compact spline-based monopole, super-ultrawideband antenna, and a quasi-Yagi component. The responses have been obtained at the selected frequencies of interest...

  • Miniaturized and Lightweight ESPAR Antenna for WSN and IoT Applications

    A new compact ESPAR antenna is investigated in this paper. The proposed antenna has 12 directional radiation patterns based on 12 passive elements and can be successfully used in Wireless Sensor Network applications. In proposed antenna design, the possibilities of 3D printing were used to implement a dielectric miniaturization overlay that allowed for reducing antenna occupied area by almost 60% and antenna profile by 27% in comparison...

    Pełny tekst do pobrania w portalu

  • Electrically tunable detector for millimeter frequency band

    Publikacja
    • A. Chernyadiev
    • D. But
    • C. Kolacinski
    • K. Ikamas
    • A. Lisauskas

    - Rok 2021

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Jumping wave photographs

    Dane Badawcze
    open access

      The photographs of the outer surface obtained in the burnishing process  showing  the shape of the jumping wave and the displacement of the material in the surface layer.

  • Multi-Beam Antenna for Ka-Band CubeSat Connectivity Using 3-D Printed Lens and Antenna Array

    In this paper, the design of a passive multi-beam lens antenna is proposed for the CubeSat space communication system as an alternative application of a 2-D microstrip antenna array that has originally been designed for a 39 GHz 5 G MU-MIMO system. The half-ellipsoid lens is 3-D printed using stereolithography (SLA) technology. The antenna prototype is capable of selecting the main beam between 16 different directions with a gain...

    Pełny tekst do pobrania w portalu

  • JOURNAL OF INFRARED AND MILLIMETER WAVES

    Czasopisma

    ISSN: 1001-9014

  • Miniature reconfigurable antenna

    Publikacja
    • R. Baranowski

    - Rok 2020

    This work concerns the design of a miniature, low-profile reconfigurable antenna based on Huygens metamaterial sources for frequency f0 = 2.45 GHz. Two planar Huygens sources were designed consisting of near-field resonators. Sources are excited from a specially designed reconfigurable control system. Thanks to the two PIN diodes, the system can realize two cardioid radiation characteristics with...

    Pełny tekst do pobrania w portalu

  • Design optimization of novel compact circular polarization antenna

    Publikacja

    The paper describes a structure and a design optimization procedure of a miniaturized circular polarization antenna with elliptical ground plane slots and feed line with stepped-impedance stubs. Constrained optimization of all antenna parameters is executed in order to explicitly reduce the antenna size while maintaining required impedance axial ratio bandwidth of 5 GHz to 7 GHz at the same time. The size of the optimized antenna...

    Pełny tekst do pobrania w portalu

  • Broadband EM simulations of quasi-randomly generated patch antenna topologies represented using coordinate points

    Dane Badawcze
    open access

    The dataset contains electromagnetic (EM) simulations of 10 000 quasi-randomly generated designs of patch antenna structures. The latter ones feature free-form radiators and fed through the concentric probe. The geometry parameters are defined in both cylindrical and Cartesian coordinate systems. Appropriate functions that enable visualization of the...

  • Single-Anchor Indoor Localization Using ESPAR Antenna

    In this paper a new single-anchor indoor localization concept employing Electronically Steerable Parasitic Array Radiator (ESPAR) antenna has been proposed. The new concept uses a simple fingerprinting algorithm adopted to work with directional main beam and narrow minimum radiation patterns of ESPAR antenna that scans 360° area around the base station, while the signal strength received from a mobile terminal is being recorded...

    Pełny tekst do pobrania w portalu

  • Design-Oriented Constrained Modeling of Antenna Structures

    Publikacja

    - Rok 2018

    Fast surrogate models are crucially important to reduce the cost of design process of antenna structures. Due to curse of dimensionality, standard (data-driven) modeling methods exhibit serious limitations concerning the number of independent geometry parameters that can be handled but also (and even more importantly) their parameter ranges. In this work, a design-oriented modeling framework is proposed in which the surrogate is...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Diagnostics of historic columns using wave propagation

    Publikacja

    - Rok 2015

    This paper presents a numerical analysis of elastic wave propagation in columns of historical buildings for diagnostics purposes. Numerical calculations were performed using the finite element method in the Abaqus software package. The analysis was carried out for three types of brick columns: a full column, a column filled with debris, and a column empty inside. The excitation was in the form of a wave packet and signals of propagating...

  • Compact Dual-Polarized Corrugated Horn Antenna for Satellite Communications

    Publikacja

    - 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...

    Pełny tekst do pobrania w portalu

  • Wave propagation in damage assessment of ground anchors

    The inspection possibilities of ground anchors are limited to destructive test such as pull-out test. Guided wave propagation gives an opportunity to develop an inspection system dedicated to determine the condition of inspected element without violation of their integrity. In this paper the experimental study on wave propagation in laboratory models of ground anchors are presented. Experiments were conducted for different bonding...

    Pełny tekst do pobrania w portalu

  • Reservoir Influence on Pressure Wave Propagation in Steel Pipes

    Publikacja

    The relation between the length of steel pipe and the pressure wave period in the system, reservoir-pipe-valve, is discussed. Experiments carried out for the short steel pipes showed that in such a system, the pressure wave celerity estimated using the measured wave cycles systematically increases with the increase of the pipe length. The observed differences can exceed even 90 m=s. As the pressure wave traveling in the pipe with...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • The description of non-linear interactions of wave and non-wave modes in a non-adiabatic plasma flow

    The method of derivation of non-linear equations for interacting modes is explained and applied to a plasma's flow affected by a magnetic field. It is based on the linear projecting of the total perturbation field into specific variations of variables in individual modes of a flow. The method may be applied in many examples of fluid flows with different mechanisms of non-adiabaticity. It is of special importance in complex flows...

    Pełny tekst do pobrania w portalu

  • Compact antenna array comprising fractal-shaped microstripradiators

    A design method of antenna array consisting of eight microstrip patches modified with Sierpinski fractal curves has been presented andexperimentally validated in this paper. Method proposed has enabled the achievement of considerable miniaturization of array length (26%),together with multi-band behavior of the antenna, which proves the attractiveness of presented design methodology and its ability to be implemented in more complex...

    Pełny tekst do pobrania w portalu

  • Diagnostics of thermal processes in antenna systems of broadcast stations

    Publikacja

    - Przegląd Elektrotechniczny - Rok 2014

    Diagnostics is an important element associated with the operation of a radio antenna systems, allowing earlier detection of potential damage. Thermography is one of the diagnostic tools, which allows for non-invasive assessment of technical condition. It brings together both financial savings associated with the removal of the damage and the potential effects caused by it. The article presents an example of using a thermal imaging...

    Pełny tekst do pobrania w portalu

  • Analysis of wave propagation in a bolted steel joint

    Publikacja

    - Rok 2016

    The paper presents results of numerical and experimental investigations of elastic wave propagation in a bolted single-lap joint. The research was carried out for both symmetric and antisymmetric Lamb wave modes. In experimental studies the PZT transducers were used to excite and register wave propagation signals. The controlled value of the torque during measurements was ensured by the use of high precision torque wrenches. Numerical...

  • Performance-Based Nested Surrogate Modeling of Antenna Input Characteristics

    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...

    Pełny tekst do pobrania w portalu

  • Small Antenna Design Using Surrogate-Based Optimization

    Publikacja

    In this work, design of small antennas using efficient numerical optimization is investigated. We exploit variable-fidelity electromagnetic (EM) simulations and the adaptively adjusted design specifications (AADS) technique. Combination of these methods allows us to simultaneously adjust multiple geometry parameters of the antenna structure of interest in a computationally feasible manner, leading to substantial reduction of the...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Novel structure and design of compact UWB slot antenna

    Publikacja

    In this paper, a novel structure of a compact UWB slot antenna is presented along with a simulation-driven design optimization algorithm for adjusting geometry parameters of the device. Our primary objective is to obtain small footprint of the structure while maintaining its acceptable electrical performance. It is achieved by introducing sufficiently large number of geometry degrees of freedom, including increased number of parameterized...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Rapid EM-driven antenna dimension scaling through inverse modeling

    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...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • A Concept and Design Optimization of Compact Planar UWB Monopole Antenna

    Publikacja

    A novel structure concept of a compact UWB monopole antenna is introduced together with a low-cost design optimization procedure. Reduced footprint is achieved by introduction of a protruded ground plane for current path increase and a matching transformer to ensure wideband impedance matching. All geometrical parameters of the structure are optimized simultaneously by means of surrogate based optimization involving variable-fidelity...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Simulation-driven design of compact ultra-wideband antenna structures

    Purpose–The purpose of this paper is to investigate strategies and algorithms for expedited designoptimization and explicit size reduction of compact ultra-wideband (UWB) antennas.Design/methodology/approach–Formulation of the compact antenna design problem aiming atexplicit size reduction while maintaining acceptable electrical performance is presented. Algorithmicframeworks are described suitable for handling various design situations...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Jumping Wave 2D Profiles

    Dane Badawcze
    wersja 1.0 open access

    The file contains 2D profiles obtained from a jumping wave study in front of the tool during burnishing of 1.0562 steel by the toroidal-cone tool.  Burnishing speed 30.5 m/min, feed of burnishing 0.2mm/rev Force 550 and 800 N.

  • Dual-band antenna with improved gain for WLAN and ISM applications

    In this Letter, a dual-band antenna with an improved gain is proposed. The structure features 9.7 and 10.4 dBi gain within 2.4 GHz to 2.5 GHz and 5 GHz to 6 GHz bands, respectively. This makes it suitable for WLAN and ISM applications. The structure comprises an asymmetrical pair of radiators and slots suspended over a reflector. The antenna is optimised in a two-stage process using a trust-region-based gradient search algorithm....

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Numerical FDM modelling of wave propagation in concrete structure

    The article presents application of finite difference method to damage detection and its size evaluation in concrete structure by elastic wave propagation method. The simulations of wave propagation in concrete structure were performed for six different damage scenarios. Damages were modelled as areas with changed material properties. Investigation focused on the influence of damage size on the energy of wave reflection. Presented...

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

    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...

    Pełny tekst do pobrania w portalu

  • Improved Bandwidth of Microstrip Wide-Slot Antenna Using Gielis Curves

    The development of a broadband printed wide-slot antenna based on Gielis curves is presented in this article. The printed wide-slot antenna can be conveniently reshaped to achieve ultra-wideband performance by using superformula. The distinct advantage of employing the superformula in design of wide-slot antenna lies in its ability to define nearly any geometric shape including non-standard, complex and non-intuitive for the wide-slot...

    Pełny tekst do pobrania w serwisie zewnętrznym

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

    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...

    Pełny tekst do pobrania w portalu

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

    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...

    Pełny tekst do pobrania w portalu

  • Millimeter and submillimeter range detector based on graphene ballistic rectifiers

    Publikacja
    • D. But
    • C. Consejo
    • D. Coquillat
    • F. Teppe
    • W. Knap
    • L. Varani
    • J. Torres
    • G. Auton
    • J. Zhang
    • E. Hill
    • A. Song

    - Rok 2018

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Influence of Dielectric Overlay Permittivity on Size and Performance of Miniaturized ESPAR Antenna

    Publikacja

    In this paper, influence of dielectric overlay permittivity on miniaturized ESPAR antenna parameters is presented. ESPAR antenna is a low-cost and energy-efficient way to implement beam steering capability to a node and improve network performance. The antenna size reduction is obtained by embedding its active and passive elements in ABS based materials of relative permittivity equal to 4, 5.5 and 7.5 in order to achieve network...

    Pełny tekst do pobrania w portalu

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

    Publikacja

    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 compensate them has been proposed....

    Pełny tekst do pobrania w portalu

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

    Publikacja

    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...

    Pełny tekst do pobrania w portalu

  • Testing the impact of simplifications adopted in models describing wave loads on ship

    Publikacja

    - Rok 2011

    The wave-ship system in naval architecture is generally assumed to be a linear one. This allows for the computation of a transfer function of ship response to waves including wave loads on ship. The transfer function and the wave spectral density function enable the development of the stochastic process of wave loads on ship, corresponding to the irregular wave generating that loads. If the mathematical models of wave load transfer...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Testing the impact of simplifications adopted in models describing wave loads on ship

    Publikacja

    - Rok 2012

    The wave-ship system in naval architecture is generally assumed to be a linear one. This allows for the computation of a transfer function of ship response to waves including wave loads on ship. The transfer function and the wave spectral density function enable the development of the stochastic process of wave loads on ship, corresponding to the irregular wave generating that loads. If the mathematical models of wave load transfer...

  • ESPAR Antenna-Based WSN Node With DoA Estimation Capability

    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...

    Pełny tekst do pobrania w portalu

  • Experimental and numerical analysis of wave propagation in ground anchors

    Publikacja

    - Rok 2016

    The article focuses on wave propagation phenomenon in ground anchors. The main aim of the investigation is the non-destructive diagnostics and the assessment of the state of ground anchors, using the guided wave propagation method. Laboratory models of anchors with different lengths of the anchor body were tested and voltage signals of propagating waves were registered at several locations. For all tested specimens corresponding...

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

    Publikacja

    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...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • A Finite Element Approach for Wave Propagation in Elastic Solids

    Publikacja

    - Rok 2024

    This book focuses on wave propagation phenomena in elastic solids modelled by the use of the finite element method. Although the latter is a well-established and popular numerical tool used by engineers and researchers all around the word the process of modelling of wave propagation can still be a challenge. The book introduces a reader to the problem by presenting a historical background and offering a broad perspective on the...

    Pełny tekst do pobrania w serwisie zewnętrznym