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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 47 for “"Scattering Parameters"”.
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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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Large-signal characterization and modeling of nonlinear devices using scattering parameters
… modeling 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 …
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Solution Of Electromagnetic Scattering Parameters And Radiation Patterns Of Arbitrary Body Of Revolution Radiators
… novel full wave analysis method to determine the scattering parameters and the radiation field intensities of arbitrary Body of Revolution (BOR) radiators consisting of impenetrable media is explored through derived components of modal analysis and the method of moments (MoM). Modal excitation is …
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Extracting frequency domain network parameters using the latency insertion method
… is presented 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, …
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Design, Fabrication, and Measurement of a Multiple-Input Multiple-Output (MIMO) Antenna for Mobile Communication
… of the MIMO antenna included input impedance, scattering parameters and radiation pattern cross sections that were all measured from 500-6500 MHz inside an anechoic chamber. The measurement results indicated four main operating regions of the multiband antenna centered at 875 MHz, 2300 MHz, …
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A physical model to estimate snowfall over land using microwave measurements
… frozen hydrometeors is significant. However, the scattering effect of snowfall in the atmosphere at those higher frequencies is also impacted by water vapor and supercooled water in the upper atmosphere.The Discrete Dipole Approximation (DDA) method was employed to generate the single scattering …
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Simulation of the radiative flux at the martian surface between 180 and 1100 nm
… explained in terms of the influence of aerosol scattering parameters. Enhancement of the total surface flux by ~20% or greater is shown to occur at latitude and <i>L<sub>s</sub></i> values corresponding to the presence of the aphelion cloud belt and during the annual dust …
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Scattering Matrix Analysis of Surface Acoustic Wave Reflectors and Transducers
The phased periodic array scattering parameters {1} have been modified and corrected for use as a single electrode, mixed units, scattering matrix consisting of one electrical and two acoustic ports. These scattering parameter analytical expressions are functions of material constants, electrode …
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Neutron-proton bremsstrahlung at 4.8 MeV
… to this experiment has been made using elastic scattering parameters. The measured upper limit is above this and other theoretical predictions, but represents a marked improvement over previous measurements in the energy range. Bibliography: p. 107-111.
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Design and Analysis of an Electronically Steerable Microstrip Patch and a Novel Coplanar Waveguide (CpW) Fed Slot Antenna Array
… by incorporating the measured delay line scattering parameters inside Ansys Designer simulation models and then computing and presenting their full-wave radiation characteristics.</p>
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A Method of Moments Solution of Stripline Discontinuity Problems
… electric field integral equation. Finally, the scattering parameters of an arbitrarily shaped discontinuity in a stripline are found by solving an integral equation by the method of moments. In the solution of this problem, the series acceleration technique is used to sum the periodic Green's …
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Antenna Multi-Band Enhancement by Employing Negative Impedance Converters
… picosecond laser and subsequently tested for its scattering parameters. Performance measurements at both, without DC bias and 10 V, revealed a notable difference in matching between the active and passive states, confirming that the NIC effectively supersedes the passive matching of its …
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Higher-order Petrov-Galerkin methods for analysis of antennas
… using a Gaussian pulse to allow frequency-domain parameters to be computed over a range of frequencies with a single time-dependent solution. Verification cases for a monopole antenna and a microstrip patch antenna are used to examine the accuracy of the algorithm. Effects of varying antenna …
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Raindrop size distribution
… relationship). Also introduce the theory of scattering by such hydrometers as rain, snow, hail and fog. There are three techniques to determine the scattering parameters are Rayleigh Scattering, Mie Scattering and T-Matrix method.
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Analysis of periodic structures using finite-difference time-domain method
… FDTD/PBC approach is introduced to analyze the scattering properties of general skegrid periodic structures. The approach is simple to implement and efficient in terms of both computational time and memory usage. In addition, an efficient hybrid FDTD generalized scattering matrix (GSM) technique …
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Model-Order Reduction Techniques for Circuits and Interconnects Simulation
… coupled transmission lines characterized by scattering parameters and an optimal reference system. The heterogeneous reduction techniques are woven into a unified method by using network partitioning techniques. Recursive convolution is used to speedup the transient simulation. The method …
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Application of the spectral domain technique to discontinuity and spurious radiation problems in microwave circuits
… analyzed using the spectral domain approach. The scattering parameters of the slot are computed and compared to measured results. An equivalent circuit model of the slot discontinuity at low frequencies is also developed. Fourth, the spurious radiation and scattering from arbitrarily shaped …
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CAD of rectangular-ridged waveguide bandpass filters
… (MM) and explains how to obtain the Generalized Scattering Matrix (GSM) form the MM analysis. Then, the thesis shows how to combine all the scattering matrices of a microwave circuit to obtain its overall scattering parameters of the circuit. The combination of the MM and GSM method allows the …
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Numerically efficient analysis of microstrip configurations using closed-form Green's functions
… microstrip line terminated by complex loads, the scattering parameters for a microstrip discontinuity, and the input impedances and radiation patterns for a microstrip patch antenna. It was found that the use of the closed-form spatial domain Green's functions, in the context of the MoM, is more …
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Implementation of Microwave Transmissions for Rocket Exhaust Plume Diagnostics
… J-class solid rocket motor. Measurements of the scattering parameters imply that the transmission does not penetrate the plume, but instead diffracts around it. The electron density 20 cm downstream from the nozzle exit is estimated to be between 2.7x10 <sup>14</sup> m<sup>-3</sup> and …
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