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Coupling Techniques (coupling + techniques)

Distribution by Scientific Domains

Engineering	80%

Selected Abstracts

Coupling Techniques for Thermal and Mechanical Fluid-Structure-Interactions in Aeronautics

PROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2005
Matthias Haupt
For the coupled thermal and mechanical analysis of spacecraft structures a simulation environment was developed containing the necessary coupling techniques. The numerical concept uses the weak form of the interface conditions on the coupling surface. The iterative solution of the coupled equations is based on the classical Dirichlet-Neumann approach. Transient problems are handled with iterative staggered schemes. A flexible component-based software environment combines existing fluid and structural analysis codes. Aspects of the architecture and its implementation are described. Finally an application to a spacecraft structure is shown. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Novel microstrip bandpass filter based on defected ground structure and slotline coupling techniques

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2010
Wenjie Feng
Abstract A novel microstrip bandpass filter integrating the defected ground structure and slotline coupling technique is presented in this letter. A slotline resonator with a length of three-quarter wavelength at central frequency is etched on the ground, while a pair of radial stubs is centrally introduced. Two microstrip open stubs are then placed above the slotline resonator, saying, on the top plane of the dielectric substrate. By properly adjusting the lengths of the microstrip stubs, a wideband passband filter is thus implemented using coupling between 50-, microstrip (on the top plane) and the slotline (on the bottom). A prototype is fabricated to validate the proposed design strategies. The experiments and simulations both indicate good performances. The measured fractional bandwidth of prototype is about 89%, the return loss is less than ,15 dB in the whole passband. In addition, the measured rejection bandwidth at ,25 dB is even higher up to 10 GHz, thus, demonstrating a very good harmonic suppression ability. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 4,6, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24816 [source]

Modified maximally flat parallel-coupled lines for band-pass filter applications and miniaturizations

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2008
Ji-Chyun Liu
Abstract The modified configurations of maximally flat parallel-coupled lines (MF-PCL) structure are introduced to improve the performance of the conventional MF-PCL resonator. To obtain a higher rejection (,39 dB), symmetry response, wider band (BW about 32%), and less insertion loss (,0.4 dB) filters at central frequency 5.78 GHz, the modified MF-PCL resonators by using enhanced coupling techniques are proposed herein. The size reduction of 50% is achieved. Results including surface current distributions and frequency responses are presented and discussed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 902,906, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23243 [source]

Trefftz, collocation, and other boundary methods,A comparison

NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS, Issue 1 2007
Zi-Cai Li
Abstract In this article we survey the Trefftz method (TM), the collocation method (CM), and the collocation Trefftz method (CTM). We also review the coupling techniques for the interzonal conditions, which include the indirect Trefftz method, the original Trefftz method, the penalty plus hybrid Trefftz method, and the direct Trefftz method. Other boundary methods are also briefly described. Key issues in these algorithms, including the error analysis, are addressed. New numerical results are reported. Comparisons among TMs and other numerical methods are made. It is concluded that the CTM is the simplest algorithm and provides the most accurate solution with the best numerical stability. © 2006 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2007 [source]