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Wave Concept (wave + concept)
Selected AbstractsAnalysis of microwave circuits including lumped elements based on the iterative methodINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2003H. Trabelsi Abstract The work presented here introduces lumped elements to an iterative method based on the wave concept combined with the two-dimentional fast Fourrier transformation algorithm known as fast modal transformation (FMT). We extend this method to the analysis of microwave-distributed circuits containing passive or active, linear or nonlinear lumped elements which are characterized by their surface impedance as defined in this article. Simulation results of varactor-tuned filter and phase-shifter circuit examples are compared with the measurement results. Good agreement between simulated and experimental results validates the use of the iterative method for the analysis of planar circuits, including lumped elements. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 269,275, 2003. [source] An iterative method for modeling of antennasINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2001E. Richalot Abstract An iterative process based on the wave concept is presented. This technique enables the rigorous treatment of radiating structures modeled by the finite element method (FEM) while preserving its computational efficiency. The coupling of the FEM model with the open region modeled by the integral equation technique is solved iteratively. © 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 194,201, 2001. [source] The non-Gaussian nature of bibliometric and scientometric distributions: A new approach to interpretationJOURNAL OF THE AMERICAN SOCIETY FOR INFORMATION SCIENCE AND TECHNOLOGY, Issue 13 2001Ludmila E. Ivancheva An attempt has been made to give an answer to the question: Why do most bibliometric and scientometric laws reveal characters of Non-Gaussian distributions, i.e., have unduly long "tails"? We tried to apply the approach of the so-called "Universal Law," discovered by G. Stankov (1997, 1998). The basic principle we have used here is that of the reciprocity of energy and space. A new "wave concept" of scientific information has been propounded, in which terms the well-known bibliometric and scientometric distributions find a rather satisfactory explanation. One of the made corollaries is that , = 1 is the most reasonable value for the family of Zipf laws, applied to information or social phenomena. [source] Modelling of non linear elements using an extended iterative methodMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007Mohamed Glaoui Abstract This paper presents an iterative method based on the wave concept for investigation of structures including Non-linear components. The principle of the iterative method consists to establishing a relationship between incident and reflected waves in order to characterize the studied structure. A passage from frequency domain to time domain is used to describe the behavior of a non-linear transmission line (NLTL) including eight Varactor diodes. It is demonstrated that the NLTL plays the role of a delay time line (DTL). The reflected and transmission coefficients are determined. The numerical results are compared with published data. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 143,147, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22079 [source] | ||||||||||