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Microwave Filters (microwave + filter)

Distribution by Scientific Domains

Engineering	100%

Selected Abstracts

Surrogate-based infill optimization applied to electromagnetic problems

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2010
I. Couckuyt
Abstract The increasing use of expensive computer simulations in engineering places a serious computational burden on associated optimization problems. Surrogate-based optimization becomes standard practice in analyzing such expensive black-box problems. This article discusses several approaches that use surrogate models for optimization and highlights one sequential design approach in particular, namely, expected improvement. The expected improvement approach is demonstrated on two electromagnetic problems, namely, a microwave filter and a textile antenna. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010. [source]

Exhaustive approach to the coupling matrix synthesis problem and application to the design of high degree asymmetric filters

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2007
Richard J. Cameron
Abstract In this paper a new approach to the synthesis of coupling matrices for microwave filters is presented. The new approach represents an advance on existing direct and optimization methods for coupling matrix synthesis, in that it will exhaustively discover all possible coupling matrix solutions for a network if more than one exists. This enables a selection to be made of the set of coupling values, resonator frequency offsets, parasitic coupling tolerance, etc. that will be best suited to the technology it is intended to realize the microwave filter with. To demonstrate the use of the method, the case of the recently introduced "extended box" coupling matrix configuration is taken. The extended box is a new class of filter configuration adapted to the synthesis of asymmetric filtering characteristics of any degree. For this configuration the number of solutions to the coupling matrix synthesis problem appears to be high and offers therefore some flexibility that can be used during the design phase. We illustrate this by carrying out the synthesis process of two asymmetric filters of 8th and 10th degree. In the first example a ranking criterion is defined in anticipation of a dual mode realization and allows the selection of a "best" coupling matrix out of 16 possible ones. For the 10th degree filter a new technique of approximate synthesis is presented, yielding some simplifications of the practical realization of the filter as well as of its computer aided tuning phase. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007. [source]

All optical multi-tap microwave filter with high sidelobe suppression using peak profile of ASE and one multiwavelength FBG

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009
Li Xia
Abstract A new all optical 10-tap microwave filter is proposed using a broadband amplified spontaneous emission (ASE) light source and a single specially designed multiwavelength FBG. Measured results show that the sidelobe suppression is larger than 20 dB. The filter response is insensitive to the polarization state of light. This technique enables one to obtain a simple and low cost photonic microwave filter with a stable response. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2522,2524, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24666 [source]

A microwave filter fabricated on the lead free piezoelectric substrate using the interdigital capacitor and bonding-wire inductor

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2008
Min-Hang Weng
Abstract In this letter, a lumped-element bandpass filter (BPF) fabricated on the high-dielectric constant piezoelectric substrate using the interdigital capacitor and the bonding-wire inductor is designed and implemented. The lead-free piezoelectric substrate of Bi0.5Na0.5TiO3 (BNT) ceramics prepared by a conventional solid-state reaction method and sintered at temperatures 1100°C was used as substrate. The resonant frequency could be easily controlled by varying the lengths of silver bonding wire. The design procedure using the analysis of different bond-wire lengths of silver wire is described in this work. A lumped-element BPF with a central frequency at 0.9 GHz and a fractional bandwidth of 31.53% are fabricated and measured using the network analyzer. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2594,2597, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23706 [source]

TM010 dielectric loaded cavity resonator for microwave filter

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2004
Jian Wang
Abstract This paper describes a type of rectangular dielectric-loaded cavity resonator based on TM010 mode. The resonator has an unloaded quality factor (Q) of about 10,000 and good spurious-free performance and is suitable for the design of multiple cavity microwave filters. We present two sample filters using this kind of resonator. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 43: 373,376, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20473 [source]

Design of transmission line filters and matching circuits using genetic algorithms

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, Issue 6 2007
Hirofumi Sanada Member
Abstract A method for designing microwave filters and impedance matching circuits using transmission lines is presented. Transmission line filters with shunt-connected open circuit stubs and continuously varying transmission line matching circuits are described in detail. The proposed method is based on genetic algorithms and can effectively be applied to various filter and matching circuit design problems without increasing theoretical and computational complexity. Design examples are provided, and the proposed method is demonstrated to be effective in designing transmission line filters and matching circuits. Copyright © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source]

Special issue on RF and microwave filters, modeling and design

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2007
Pierre Jarry Guest Editor
No abstract is available for this article. [source]

Exhaustive approach to the coupling matrix synthesis problem and application to the design of high degree asymmetric filters

Design of waveguide microwave filters by means of artificial neural networks

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 6 2006
Antonio Luchetta
Abstract Cylindrical post-based waveguide filters are a relevant component of antenna feeding networks. Their synthesis performed via automatic optimization based on full-wave analyses can be very time consuming. In this article a novel fast-design approach based on Levy's and Moore's algorithms and an artificial neural network (ANN) architecture is presented. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006. [source]

Transverse transmission line method to analyze stop-band microwave filters

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2007
A. L. P. S. Campos
Abstract In this article, we consider the analysis of stop-band microwave filters using periodic structures on isotropic substrates with dielectric losses. Frequency selective surfaces composed by an array of rectangular conducting patch elements are considered to compose the stop-band filters. This analysis uses the method of moments in combination with the transverse transmission line method, in the Fourier domain, to determine the scattering characteristics of the considered structures. A good agreement with the results presented by the other authors is observed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2678,2681, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22856 [source]