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Accuracy of propagation modeling on transmission lines

Piscataway, N.J. : IEEE
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Accuracy of propagation modelling on transmission lines - Electromagnetic Compatibility, 1999 IEEE International Symposium on Accuracy of Propagation Modeling on Transmission Lines S. Grivet-Talocia Dip. Elettronica, Politecnico di Torino 1-10129, Torino, Italy Email: grivetQpolito. it Abstract: This paper investigates the accuracy of the Nonuniform Multiconductor Transmission Lines (NMTL) equations when they are used to reproduce voltages and currents on structures made of nonparallel conductors. A commercial software based on the NEC2 kernel is used as a virtual measurement tool to validate the outcome of the NMTL model. Three factors that affect the accuracy of the NMTL equations are evidenced, namely radiation, nonuni- formity of the cross-section, and asimmetry between dif- ferent conductors. The results show that the NMTL equa- tions constitute indeed a quite robust model for a wide range of structures. Therefore, it is confirmed that the NMTL equations can be used to simulate the electrical behavior of many interconnects of practical interest. INTRODUCTION The Multiconductor Transmission Lines (MTL) model is widely used to represent structures made of parallel con- ductors with a translation-invariant cross-section. The ac- curacy of this model is well trusted, because many nu- merical and experimental validations can be found in the literature. Also, the solution of the MTL equations is a simple task both in the frequency and in the time domain (see [ 11 and references therein). An extension of the MTL model is provided by the Nonuni- form Multiconductor Transmission Lines (NMTL) equa- tions. These equations introduce a longitudinal variation in the per-unit-length parameters, thus allowing to rep- resent structures of conductors with a nonuniform cross- section. The cross-sectional parameters are evaluated at fixed locations around the line, by assuming that the dom- inant mode of propagation is the quasi-TEM mode. Im- plicitely

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