1,721,080 research outputs found
TDR Measurements for Soil Applications
No full textA time-domain reflectometry measurement system for the estimation
of soil permittivity is analysed. The system is modeled as a
distributed chain network and the model is used to investigate
the sensitivity and the uncertainties of the permittivity
estimations
Transient field coupling and crosstalk in lossy lines with arbitrary loads
Full text linkWe extend the transient scattering analysis of a lossy multiconductor transmission line to the evaluation of the interference produced by a field illuminating the line. The external interference is described by suitable voltage wave sources that are readily computed in the time domain and do not affect the structure of the transient scattering equations. The proposed formulation fully exploits the advantages of the transient analysis based on the line matched scattering parameters, dealing effectively with low-loss lines and helping the understanding of the interference mechanism through the physical interpretation of the results
Differential-difference equations for the transient simulation of lossy MTLs
Full text linkIn this paper, we address the differential representation of the time-domain characteristics of lossy MTLs. This approach is of great interest for the efficient simulation of circuits with long interconnects and nonlinearities. The properties of this characterization method are discussed with particular emphasis on the bandwidth and on the order of the differential operators used. Our discussion is supported by a complete characterization example for a realistic wideband 3-conductor interconnec
Transient simulation of lossy multiconductor interconnects
Full text linkThe transient simulation of electrically-long low-loss multiconductor interconnects is considered from a practical point of view. The importance of frequency dependent losses in these interconnects is discussed and a simple transmission line characterization procedure allowing for such losses is proposed. The characterization obtained yields simple and efficient interconnect models, that the user can include, without programming, in any simulator accepting differential operator
Design of High Power Low Noise Polarization Insensitive Ridge Waveguide Laser Amplifiers
No full textEfficient computation of transient responses of frequency-dependent nonlinearly loaded transmission lines
Full text linkThe authors address the combined time and frequency domain analysis of nonlinearly loaded low-loss transmission lines. They show that a variety of interconnects are characterized by transfer functions, whose impulse responses have a fast initial-time structure and a slow long-time component. A piecewise linear approximation of the transient functions with nonuniform sampling is proposed as an effective method to obtain high accuracy with low computational cost
Complex Permittivity Determination from Measured Scattering Parameters of TEM Waveguides
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Lossy transmission line response via numerical Laplace transform inversion
Full text linkAn efficient transient analysis of lossy lines with nonlinear loads requires the ability to compute and represent a suitable set of line impulse responses. In this paper, we propose the evaluation of the matched-line impulse responses by means of an algorithm for the numerical inversion of the Laplace transform. Based on a discussion of the structure of the impulse responses, we demonstrate how, for this class of functions, the method proposed is particularly effective and convenient, in comparison with the conventional FFT approach. We also compare the line responses due to the exact per-unit-length resistance of a circular wire with those due to a simplified model, and find a non-negligible influence on the integrity of the signals that propagate on the lin
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