Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Characteristic Impedance"”.
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Micromachined transmission lines for microwave applications
… pads, which have coplanar configuration and 50 * characteristic impedance, are indispensable for on-wafer characterization of the strip lines. <br>The Finite Element (FE) code was programmed in order to calculate the characteristic impedance of the strip line by solving the Laplace equation of the …
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Mathematical and fuzzy modelling of high-speed interconnections in integrated circuits.
… new algorithms to calculate the time delay and characteristic impedance using capacitance matrices of both types of nonuniform lines. These algorithms finally became a generalised algorithm which could be used in any type of coupled microstrip lines, uniform and nonuniform. The time delay and …
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High-frequency characterization of embedded components in printed circuit boards
… The proposed model can be used to predict the characteristic impedance and the loss of the lines. The model is based on two similar approximations that reduce the multilayer substrate to an equivalent single-layer structure. The per-unit-length shunt impedance parameters are derived from the …
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Identification of the Impulse-Response Functions of a Non-Reflecting Monopolar Neuron and Its Parts
… ("voltage") cable theory. Also, the concepts of characteristic impedance, Z$\sb0$, and propagation factor, $\gamma$, of transmission line theory were instrumental in determining the propagation of both current and voltage signals, including those of their reflections. The latter were proven to be …
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Multi-defect localization and evaluation techniques for distribution cables based on time-domain reflectometry
… of defect-related signal propagation characteristics, the lack of advanced signal processing techniques, and performance limitations of detection equipment, traditional TDR methods struggle to accurately detect, localize, and evaluate defects under conditions such as signal distortion …
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Characterization and modeling of crosstalk noise in digital systems and microwave applications
… noise along adjacent lines, current-voltage characteristics, characteristic impedance, effective dielectric impedance, and maximum crosstalk are performed analytically. Computer simulations and computations of these parameters are also performed. The circuits are realized experimentally, and …
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Liquid level measurement using a coplanar transmission line
… used lines machined from an Aluminium plate for characteristic impedance measurement. An empirical relation between the gap width, the line thickness, and the characteristic impedance of the line is presented. To assist with the design of the sensor, a lumped capacitance model of the line was …
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An Investigation of Modal Characteristics and Discontinuities in Printed Circuit Transmission Lines (Microstrip, Galerkin, Singular, Integral, Coupled-Mode)
… using the spectral Galerkin technique. The characteristic impedance and field configurations of these modes are also calculated. These modes are then used in a mode matching technique, in order to calculate the scattering from abrupt discontinuities in the microstrip. Results are given for …
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Tunable Impedance Matching Network Fundamental Limits and Pracitical Considerations
… which arises from these factors is that of impedance mismatch. Recently, tunable impedance matching networks have begun to be implemented to address this problem. ^ This dissertation presents the first in-depth study on the frequency tuning range of tunable impedance matching networks. Both …
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Issues related to finite element techniques for two dimensional transmission structures
… line geometries to obtain capacitance and characteristic impedance. A finite element model that is a full field expression of Maxwell's equations is developed through a novel variational formulation involving the method of Lagrange multipliers, with attention given to the physical basis of …
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An historical, theoretical and experimental study of the broadband antenna problem with application to short pulse probing radars
… and criteria summarizing the essential antenna characteristics are established. The properties of several transient antennas are evaluated in this context and one, the Wohlers antenna, is selected for further study.Topics such as the characteristic impedance of planar transmission lines, the …
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Dielectric measurement based microstrip transmission line
… it can provide the electrical and magnetic characteristics of the materials, which proved useful in many research and development fields.The proposed technique present a simple microstrip transmission line method for the broadband radio frequency characterization of dielectric constant of …
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Modeling strategies for estimating and suppressing electromagnetic interference and improving power integrity
… capacitor can vary by 26% depending on characteristics of the printed circuit board. Here, simple and accurate inductance models of 2- and 8-terminal capacitors including connections to the power and return plane are developed. Circuit models of the capacitors and layout are created …
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Acoustic measurements of flowing and quasi-static particulate suspensions
… was measured. A simple method of measuring the characteristic impedance of the suspension was also devised and preliminary measurements were made. Reverberant region (4 - 20 kHz). Three parameters were measured: the decay rate of the reverberant field in certain frequency bands; the level of …
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Transmission Lines For Ir Signal Routing
… in terms of transmission-line parameters: characteristic impedance, attenuation constant and effective index of refraction. These parameters were extracted by fitting the computed impedance as a function of transmission-line length to the usual impedance transformation equation. The …
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Bench blast modeling: Consequences of crushed zone, wave front shape, and radial cracks.
… rock properties. The ratios are velocity ratio, characteristic impedance ratio, medium stress ratio, and detonation pressure ratio. The empirical relations for granite, salt, and limestone in combination with a variety of explosives show that the scaled crushed zone diameter increases at a …
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Feasibility study of a hybrid passive/active noise absorption system
… using its sound propagation constant and its characteristic impedance which were empirically determined. Three different control strategies were investigated for the Passive! Active system. These control strategies were: (i) directly minimizing the reflected wave, (ii) inducing a …
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Physics of Superconducting Travelling-Wave Parametric Amplifiers
… fractions, high gains, and close to 50 Ohm characteristic impedance. I characterised these TWPAs and measured their gain performance. I also operated superconducting resonators as resonator amplifiers. I report measurements of > 20 dB gain for both TWPAs and resonator amplifiers. My results …
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Development of a spring-less RF MEMS switch
… is represented using lumped RLC components and characteristic impedance of the transmission line. The relationship between the electrical model and the scattering parameters is explained with the effects of the individual component on the S-Parameter being studied. Electromagnetic simulations …
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Parameterized modeling of multiport passive circuit blocks
… or design parameters such as center frequency or characteristic impedance in case of distributed transmission line structures. The parameterized models of individual blocks need to be compact and passive since the optimizer would be solving differential equations (time domain integration or …
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