Séance de cours

Théorie des lignes de transmission: Solutions de fréquence

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Dans cours

EE-575: Wave propagation along transmission lines

In this lecture, we will describe the theoretical models and computational methods for the analysis of wave propagation along transmission lines. ...

Description

Cette séance de cours couvre les solutions du domaine fréquentiel pour les lignes de transmission, y compris la dérivation des équations du télégraphe, le concept de constante de propagation complexe, les coefficients de réflexion de tension et l'indice de Blumer. Il traite également de la propagation des ondes le long des lignes de transmission, de l'utilisation des équations BLT pour les sources groupées et de l'évaluation de l'impédance d'entrée. La séance de cours se termine par une explication de l'indice Blumer et son application dans l'évaluation de la qualité de la représentation spectrale.

Enseignant·e

Farhad Rachidi-Haeri

Farhad Rachidi (IEEE Fellow, EMP Fellow, Electromagnetics Academy Fellow) was born in Geneva in 1962. He received the M.S. degree in electrical engineering and the Ph.D. degree from the Swiss Federal Institute of Technology, Lausanne, in 1986 and 1991 respectively. He worked at the Power Systems Laboratory of the same institute until 1996 and had several short stays at the University of Florida and the NASA Kennedy Space Center. In 1997, he joined the Lightning Research Laboratory of the University of Toronto in Canada and from April 1998 until September 1999, he was with Montena EMC in Switzerland. He is currently a titular professor and the head of the EMC Laboratory at the Swiss Federal Institute of Technology, Lausanne, Switzerland. His research interests concern electromagnetic compatibility, lightning electromagnetics and electromagnetic field interactions with transmission lines. Dr. Rachidi is currently a member of the Advisory Board of the IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY and the President of the Swiss National Committee of the International Union of Radio Science. He has received numerous awards including the 2005 IEEE EMC Technical Achievement Award, the 2005 CIGRE Technical Committee Award, the 2006 Blondel Medal from the French Association of Electrical Engineering, Electronics, Information Technology and Communication (SEE), the 2016 Berger Award from the International Conference on Lightning Protection, the 2016 Best Paper Award of the IEEE Transactions on EMC, and the 2017 Motohisa Kanda Award for the most cited paper of the IEEE Transactions on EMC (2012-2016). In 2014, he was conferred the title of Honorary Professor of the Xi’an Jiaotong University in China. He served as the Vice-Chair of the European COST Action on the Physics of Lightning Flash and its Effects from 2005 to 2009, the Chairman of the 2008 European Electromagnetics International Symposium, the President of the International Conference on Lightning Protection from 2008 to 2014, the Editor-in-Chief of the Open Atmospheric Science Journal (2010-2012) and the Editor-in-Chief of the IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY from 2013 to 2015. He is a Fellow of the IEEE and of the SUMMA Foundation, and a member of the Swiss Academy of Sciences. He is the author or coauthor of over 200 scientific papers published in peer-reviewed journals and over 400 papers presented at international conferences.

Source officielle

Proximité ontologique

Électrotechnique

Radio-frequency engineering: Topics in radio-frequency engineering

Concepts associés (32)

Propagation constant

The propagation constant of a sinusoidal electromagnetic wave is a measure of the change undergone by the amplitude and phase of the wave as it propagates in a given direction. The quantity being measured can be the voltage, the current in a circuit, or a field vector such as electric field strength or flux density. The propagation constant itself measures the change per unit length, but it is otherwise dimensionless. In the context of two-port networks and their cascades, propagation constant measures the change undergone by the source quantity as it propagates from one port to the next.

S wave

NOTOC In seismology and other areas involving elastic waves, S waves, secondary waves, or shear waves (sometimes called elastic S waves) are a type of elastic wave and are one of the two main types of elastic body waves, so named because they move through the body of an object, unlike surface waves. S waves are transverse waves, meaning that the direction of particle movement of a S wave is perpendicular to the direction of wave propagation, and the main restoring force comes from shear stress.

Power transmission

Power transmission is the movement of energy from its place of generation to a location where it is applied to perform useful work. Power is defined formally as units of energy per unit time. In SI units: Since the development of technology, transmission and storage systems have been of immense interest to technologists and technology users. Electric power transmission With the widespread establishment of electrical grids, power transmission is usually associated most with electric power transmission.

Reflections of signals on conducting lines

A signal travelling along an electrical transmission line will be partly, or wholly, reflected back in the opposite direction when the travelling signal encounters a discontinuity in the characteristic impedance of the line, or if the far end of the line is not terminated in its characteristic impedance. This can happen, for instance, if two lengths of dissimilar transmission lines are joined. This article is about signal reflections on electrically conducting lines.

Adaptation d'impédances

L’adaptation d'impédances est une technique utilisée en électricité permettant d'optimiser le transfert d'une puissance électrique entre un émetteur (source) et un récepteur électrique (charge) et d'optimiser la transmission des signaux de télécommunications. la théorie de la puissance maximale détermine que l'impédance de la charge doit être le complexe conjugué de l'impédance du générateur ; dans les lignes de transmission, l'impédance caractéristique est une sorte de perméabilité du milieu qui cause des réflexions quand elle change (comme en optique ou en acoustique) et qui deviennent gênantes quand la longueur de la ligne approche une fraction non négligeable de la longueur d'onde du signal.

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Séances de cours associées (64)

Les équations du télégraphe : solutions et exemples

Explore des solutions dans le domaine temporel pour les lignes sans perte et des exemples de comportement de propagation des ondes.

Lignes de transmission : solutions et équations

Explore les solutions dans le domaine temporel et fréquentiel pour les lignes de transmission, y compris la méthode Bergeron et l'impédance d'entrée.

Théorie de la ligne de transmission: propagation des ondes

Explore la théorie des lignes de transmission, les équations du télégraphiste et les solutions dans le domaine de la fréquence pour les lignes sans perte et les lignes avec perte.

Équation des vagues: Systèmes mécaniques

Explore l'équation d'onde pour les systèmes mécaniques, couvrant différentes vitesses d'onde et des solutions.

Réseaux de lignes de transmission et lignes multiconducteurs

Explore les réseaux de lignes de transmission et les lignes multiconducteurs, en discutant de la propagation des ondes et des exemples de réseaux complexes.

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Concepts associés (32)

Propagation constant

S wave

Power transmission

Reflections of signals on conducting lines

Adaptation d'impédances

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