Wyniki wyszukiwania dla: FAST FREQUENCY SWEEP

• A Compact Basis for Reliable Fast Frequency Sweep via the Reduced-Basis Method

  Publikacja

  • V. de la Rubia
  • M. Mrozowski

  - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Rok 2018

  A reliable reduced-order model (ROM) for fast frequency sweep in time-harmonic Maxwell’s equations by means of the reduced-basis method is detailed. Taking frequency as a parameter, the electromagnetic field in microwave circuits does not arbitrarily vary as frequency changes, but evolves on a very low-dimensional manifold. Approximating this low-dimensional manifold by a low dimension subspace, namely, reduced-basis space, gives...

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• Fast frequency sweep based on the model order reduction technique for calculating scattering parametersjinjFDFDj

  Publikacja

  • J. Podwalski
  • M. Mrozowski

  - Rok 2012

  Artykuł prezentuje ulepszoną, efektywną metodę przemiatania częstotliwościowego dla metody FDFD. Liczba równań opisujących analizowaną strukturę jest redukowana za pomocą metody redukcjirzędu modeli, a następnie macierz wynikowa jest diagonalizowana. Kosztowne czasowo odwracanie dużych macierzy jest zastąpione prostym mnożeniem małej macierz diagonalnej przez wektor. Zaprezentowana metoda przemiatania częstotliwościowego może...

• Fast surrogate-assisted frequency scaling of planar antennas with circular polarisation

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz

  - IET Microwaves Antennas & Propagation - Rok 2019

  In this work, the problem of computationally efficient frequency scaling (re-design) of circular polarisation antennas is addressed using surrogate-assisted techniques. The task is challenging and requires the identification of the optimum geometry parameters to enable the operation of the re-designed structure at a selected (required) centre frequency. This involves handling several performance figures such as the antenna gain,...

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• A fast time-frequency multi-window analysis using a tuning directional kernel

  Publikacja

  • K. Czarnecki
  • D. Fourer
  • F. Auger
  • M. Rojewski

  - SIGNAL PROCESSING - Rok 2018

  In this paper, a novel approach for time-frequency analysis and detection, based on the chirplet transform and dedicated to non-stationary as well as multi-component signals, is presented. Its main purpose is the estimation of spectral energy, instantaneous frequency (IF), spectral delay (SD), and chirp rate (CR) with a high time-frequency resolution (separation ability) achieved by adaptive fitting of the transform kernel. We...

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• Using Fast Frequency Hopping Technique to Improve Reliability of Underwater Communication System

  Publikacja

  • J. Schmidt

  - Applied Sciences-Basel - Rok 2020

  Acoustic underwater communication systems designed to work reliably in shallow coastal waters must overcome major limitations such as multipath propagation and the Doppler effect. These restrictions are the reason for the complexity of receivers being built, whose task is to decode a symbol on the basis of the received signal. Additional complications are caused by the low propagation speed of the acoustic wave in the water and...

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• A new class of eigenfunction expansion methods for fast frequency-domain analysis of waveguides

  Publikacja

  • P. Przybyszewski
  • J. Mielewski
  • M. Mrozowski

  - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Rok 2002

  Zaprezentowano nową technikę szybkiego obliczania charakterystyk dyspersyjnych falowodów z niejednorodnym wypełnieniem. Metoda ta oblicza przybliżone wartości stałej propagacji dla wymaganej częstotliwości, bazując na bardziej dokładnych wyliczeniach rozkładu pola i stałej propagacji dla kilku wybranych punktów częstotliwości.

• Fast Fourier Transform detection and reduction of high-frequency errors from the results of surface topography profile measurements of honed textures

  Publikacja

  • P. Podulka

  - Eksploatacja i Niezawodność - Maintenance and Reliability - Rok 2021

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• 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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• Comparison of Compact Reduced Basis Method with Different Model Order Reduction Techniques

  Publikacja

  • D. Szypulski
  • G. Fotyga
  • V. De La Rubia
  • M. Mrozowski

  - Rok 2019

  Different strategies suitable to compare the performance of different model order reduction techniques for fast frequency sweep in finite element analysis in Electromagnetics are proposed and studied in this work. A Frobenius norm error measure is used to describe how good job a reduced-order model is doing with respect to the true system response. In addition, the transfer function correct behavior is monitored by studying the...

• Geometry Parametric Model Order Reduction with Randomly Generated Projection Bases

  Publikacja

  • V. D. L. Rubia
  • A. Lamęcki
  • M. Mrozowski

  - Rok 2016

  In this work, a reduced-order model for geometry parameters and fast frequency sweep is proposed. The Finite Element Method is used to solve time-harmonic Maxwell’s equations. Taking into account the electromagnetic field does not arbitrarily vary as a function of frequency and geometry parameters, a low dimension system manifold is identified. Thus, the original Finite Element problem can be approximated by a model of reduced...

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