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Showing 1 to 20 of 42 for “"scattering matrix"”.
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Scattering matrix analysis of photonic crystals
Using a scattering matrix approach we analyze and study the scattering and transmission of waves through a two-dimensional photonic crystal which consists of a periodic array of parallel rods with circular cross sections. Without making any assumptions about normal incidence, single mode …
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The Generalized Scattering Matrix Analysis of Waveguide Discontinuity Problems
Made available in DSpace on 2014-12-08T22:23:36Z (GMT). No. of bitstreams: 1 6500876.pdf: 2680840 bytes, checksum: 22118d5572169127019bee03e34e0c05 (MD5) Previous issue date: 1964
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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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Reciprocity and Normality in the Scattering Matrix of Disordered Media
The scattering matrix formalism provides a practical characterization of wave transport in linear, source-free systems by relating a set of operationally defined input and output spatial channels. The matrix is structured as a block operator, with diagonal blocks encoding same-side reflection …
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The high energy asymptotic distribution of the eigenvalues of the scattering matrix
… density of the eigenvalues of the scat- tering matrix associated with the operators H0 = −∆ and H = (i∇ + A)2 + V (x), where V : Rd → R is a smooth short-range real-valued electric potential and<br/>A = (A1, . . . , Ad) : Rd → Rd is a smooth short-range magnetic vector-potential. Two cases are …
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Solution of the Finite Length Septum Problem by Scattering Matrix Techniques, With Application to Periodic Mode Suppressors
Made available in DSpace on 2014-12-08T22:24:03Z (GMT). No. of bitstreams: 1 6706612.pdf: 3745430 bytes, checksum: 45eff9be99b0d135671ea701b33f90df (MD5) Previous issue date: 1966
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Half-bound states of a one-dimensional Dirac system: their effect on the Titchmarsh-Weyl M([lambda])-function and the scattering matrix
… on the Titchmarsh-Weyl M(λ)· function and the S-matrix for a one dimensional Dirac system. For short range potentials with finite first (absolute) moments, we gave an M(λ) characterization of half bound states and, as a corollary, we deduce the behavior of the spectral function near the spectral …
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An investigation of pions in nuclear matter and nuclei
The Fermi-averaged pion-nuclear matter scattering matrix in the region of the N*(1232) resonance is calculated using two models, one incorporating a single channel (1=1) potential separable in the pion-nucleon relative coordinate and a realistic nucleon pseudopotential to investigate the effects of …
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Multigroup transport equations with nondiagonal cross section matrices
… equations for the case that the cross section matrix is nondiagonalizable. For the special case of a two-group problem with a noninvertible scattering matrix, the problem is solved completely via the Wiener-Hopf method. For more general problems, generalized Chandrasekhar H equations are …
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Resonance treatment using the Discrete Generalized Multigroup method
… to exist in the computation of moments of the scattering matrix and in the flux updates used to maintain stability. Means of reducing the computational expense associated with the scattering matrix are suggested, but left to future work. Flux updates are removed by introducing Krasnoselskij …
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Advancing integrability for strings in AdS3/CFT2
… of string solutions. Lastly, we consider the scattering of fundamental string excitations and derive all-loop expressions for the scattering matrix that includes both massless and massive excitations.
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Simulation of Simultaneously Negative Medium Metamaterials
… and permeability obtained from the simulated scattering matrix have not been reported. The work carried in this thesis fully explored the ways to address this and answer those questions mentioned in previous paragraph. To fully understand the negative refraction effect of metamaterial, the …
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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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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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SCATTERING OF ELECTROMAGNETIC PLANE WAVES FROM TWO INFINITELY LONG PARALLEL CYLINDERS OF ARBITRARY MATERIALS AT OBLIQUE INCIDENCE.
The Mueller scattering matrix elements (S(ij)) and the cross-sections for the scattering of an electromagnetic plane wave from two infinitely long, parallel, circular cylinders at oblique incidence are derived. Each cylinder can be of arbitrary materials (any refractive index). The incident wave …
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The design of hardware and signal processing for a stepped frequency continuous wave ground penetrating radar
… this information is to capture the complete scattering matrix of the received radar waveform. The objective of this thesis is to develop a signal processing technique to extract polarimetric feature vectors from Stepped Frequency Continuous Wave (SFGWV) GPR data. This was achieved by first …
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Statistical Modeling of Wave Chaotic Transport and Tunneling
… the statistical properties of the impedance matrix (related to the scattering matrix) describing the input/output properties of waves in cavities in which ray trajectories that are regular and chaotic coexist (i.e., `mixed' systems). The impedance can be written as a summation over eigenmodes …
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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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Thermal transport at the nanoscale : from fourier diffusion to phonon hydrodynamics
… and hydrodynamic phenomena by solving the full scattering matrix version of the linearized Boltzmann transport equation. Using this formalism as a guide, we report the experimental observation of second sound in graphite.
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A Statistical Theory of Fragmentations of Nuclei by Light Projectiles and Macroscopic Theory to Incorporate Resonances in the Mean Field
… needs to incorporate the resonance effect in the scattering matrix. Starting from a many body Hamiltonian, containing one- and two-body operators, a microscopic theory has been developed to incorporate resonances in the mean field for the scattering theory. It indicates that the structure of the …
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