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 48 for “"S-parameters"”.
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Dielectric Characterization: A 3D EM Simulation Approach
… test fixture and obtaining a set of simulated S-parameters through an iterative solution process, the dielectric constant and loss tangent can be found. With further development, the 3D simulation results may be used to replace the need for complex theoretical analysis of the measurement …
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Exploring the properties of a combined differential-mode equalizer and common-mode filter
… and above the design frequency. The basics of S-parameters are reviewed, and the concept is expanded to include differential networks. Results in the form of differential S-parameters and eye diagrams are analyzed to judge the effectiveness of the DME-CMF, and future signal integrity applications …
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Small Signal Equivalent Circuit Extraction From A Gallium Arsenide MESFET Device
… taken in this thesis is to use measured S- parameters to extract a small signal equivalent circuit model by optimization. Small signal models and S-parameters are explained. The Simplex Method is used to optimize the small signal equivalent circuit model. A thorough analysis of the strengths …
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Large-signal characterization and modeling of nonlinear devices using scattering parameters
… efforts may not be cost effective. Scattering parameters, widely used for small-signal passive and active device characterization, have received only cursory consideration for large-signal nonlinear device characterization due to technical and theoretical issues. We review the theory of …
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Free-Space Measurements of Dielectrics and Three-Dimensional Periodic Metamaterials
… of transmission and reflection (the S-parameters S21 and S11) are measured at frequencies from 12.4 GHz up to 30 GHz. Simulations are used to validate the measurements, using the Ansys HFSS commercial software package on the Arkansas High Performance Computing Center cluster. The …
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The crystal structures of sodium bicarbonate, propionic acid and valeric acid
… the carbonate group configuration. Zachariasen's parameters and bond distances will appear in conjunction with the results reported here to facilitate ease of comparison.
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Inference of electromagnetic system behavior in the presence of variability
… the generative modeling of high-dimensional S-parameters data. The generation accuracy is shown to be superior to that of existing methods. The passive variational autoencoder, a variational autoencoder with modified decoder architecture, is introduced to enforce physical constraints like …
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3D tooth surface reconstruction
… align the model with the target, and the PDMa??s parameters are optimized to transform the target by minimizing the sum of squared distances between the two volumes. The method was tested using second upper right premolars and showed its efficiency when reconstructing a tooth given only crown …
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Extracting frequency domain network parameters using the latency insertion method
… for extracting frequency domain scattering parameters that utilizes a time domain circuit simulation algorithm called the latency insertion method (LIM). LIM is a finite difference formulation comparable with current industry standard circuit simulators, with several advantages, namely …
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Extracting material constitutive parameters from scattering parameters
… and permeability. These constitutive parameters determine the response of the material to electromagnetic (EM) radiation. The precise knowledge of complex permittivity and permeability is required not only for scientific but also for industrial applications. Due to the uncertainties in …
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Micromachined transmission lines for microwave applications
… on-wafer with microwave coplanar probes. The S-parameters of the strip lines are measured with frequencies of up to the millimeter-wave range (48 GHz). Based on these measurements the transmission line properties of the strip line are analyzed and the corresponding equivalent circuit model is …
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Design of Class-E Radio Frequency Power Amplifier
… design techniques (Load-pull and large-signal S-parameters techniques) are presented. The design accuracy of class-A power amplifier based on the small-signal S-parameters was investigated, where compression in the power gain was used as an indicator for design accuracy. The effect of drain …
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Frequency and Field Strength Materials Characterization with Complementary Split-ring Resonators, Coplanar Waveguides, and the Virtual Ground Method
… and complementary assessments of the measured S-parameters were determined. The heterostructures/fixtures include complementary split-ring resonator and coplanar waveguide instantiations. Additionally and complementary to the RF measurement systems, a ferroelectric test measurement system for …
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Directive antenna using metamaterial substrates
… is parallel plate slab farfield radiation. The S-parameters are obtained from the wave-guide simulation and are used to retrieve the effective permittivity and permeability with which we can estimate the farfield radiation using analytic method. Thus, by comparing the farfield radiation from two …
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Estudo numérico da equação de Kardar, Parisi e Zhang
… instabilities and inconsistency between the parameters of the discretized and the continuum version. Our study advences over previous works on the KPZ equation, which usually treated those problems apart. In two dimensions, we evaluated and confirmed the universality of steady state height …
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Methods for Ripple Detection and Spike Sorting During Hippocampal Replay
… suite, "open-ephys". The algorithm's parameters were also analyzed for their suitability in operating in an unsupervised scenario. These two modules are integrated to form a system uniquely suited to decoding neuronal sequences during sharp wave ripple events.
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Design and Simulation of a Planar Crossed-Dipole Global Navigation Satellite System (GNSS) Antenna in the L1 Frequency Band
… Design System Momentum 2009U1 software. The S-parameters and radiation pattern results obtained from these simulations were compared and analyzed in MATLAB¿¿. The simulated antenna prototype performance is expected to meet the performance requirements for L1 GNSS receiver antenna.
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Design Of A Material Test Kit For Use From 1.6 Ghz To 26.5 Ghz And Its Use In Evaluation Of Dielectric Properties Of Foam Core Materials Used In Sandwich Composites
… find the permittivity in terms of the measured S-parameters. A complete view about the design of calibration kits and calibration of VNA will also be discussed in this report.</p>
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Adjoint-based particle defect yield modeling
… For the component-level models, we show how S-parameters of the device components are impacted by different types of particle defects. For the circuit-level models, we show the impact on circuit output spectrum and performance features based on component-level models, and perform critical area …
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Electromagnetics in characterizations
… in high frequency circuit applications. S-parameters of the differential mode of a coupled-strip transmission line on a multi-layer silicon substrate extracted from 4-port measurements and simulations are de-embedded by the impedance/admittance subtraction method. By accurately determining …
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