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 18 of 18 for “"characteristic modes"”.
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Characteristic Modes for Impedance Matching and Broadbanding of Electrically Small Antennas
… of small antennas. We base our analysis in characteristic mode theory which allows us to decompose the antenna behavior into the behavior of a few well-defined modes. Using this decomposition we can better understand, design, and analyze small antennas. First, we explain a unified approach …
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Synthesis process using characteristic modes for multiple in situ antennas for system radiation requirements
… with a focus on radiation pattern performance. Characteristic mode theory is commonly used to determine how structures will radiate. Solving for the modes on a structure gives the antenna designer an idea of which modes are easily excited on a structure. Each mode is associated with a modal far …
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On the accuracy of estimating input impedance of probe-fed air-substrate microstrip patch antennas using the theory of characteristic modes
Two different techniques based on the theory of characteristic modes are developed to estimate the input impedance of air-substrate, coaxial probe-fed, microstrip patch antennas with arbitrarily shaped patches. Such an antenna with an L-shaped patch is fabricated and experimentally measured, and a …
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Application of characteristic mode analysis to variable antenna placement on devices operating in the near -resonant range
… range systems does not exist. Previously, characteristic mode analysis had only been applied to systems with constant geometry that operated in the near-resonant range and the system had constant characteristic modes independent of the probe location. Successful application of …
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Analysis and design of planar slot antennas for RFID applications using characteristic mode theory
… make use of planar antennas with good radiation characteristics to achieve electromagnetic coupling between the tag and the reader. Thin form factor, placement-insensitivity, small size and good radiation characteristics are essential qualities of planar RFID tag antennas operating in the UHF …
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Characteristic mode theory for closely spaced dipole arrays
… in this work through the lens of antenna characteristic modes. The modes of an array are calculated using the method of moments, and these modes are characterized by their radiative behavior. Additionally, the Q factor of these planar arrays is calculated using the Fourier transforms of …
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Analyzing modal decomposition data of finite antenna arrays
… of the array currents. In particular we use characteristic mode analysis (CMA) which produces an indexed set of “simpler” eigencurrents, and eigenvalues that dictate the energy storage properties of the modes. These modes are dependent entirely on the method of moments impedance matrix of the …
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Nonlinear analysis and control of chemical reactors
… it extends the familiar linear systems notion of characteristic modes (eigenmodes), as well as the notions of mathematical quantities known as the eigenvectors, and eigenvalues, into a multi-dimensional nonlinear domain, i. e., applies to model dimensions one, two, three and higher. This approach …
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Scientific naturalists and the government of the Royal Society 1850-1900
… An area which is very revealing of many characteristic modes of thought entertained by Victorian men of' science, is the evaluation of' scientific performance. Enshrined in the refereeing procedures of the Royal Society, this process provides many insights into the contemporary meaning of …
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A characteristic mode perturbation approach for antenna loading design
… insight into the fundamental antenna operation. Characteristic mode theory has shown promise for systematic antenna design, yet significant limitations still exist that restrict its usefulness. The transformations of characteristic modes with respect to frequency or reactive loading are currently …
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The influence of klezmer on twentieth-century solo and chamber concert music for clarinet: with three recitals of selected works of Manevich, Debussy, Horovitz, Milhaud, Martino, Mozart and others.
… klezmer elements in their concert works. Characteristic modes (Freygish and Misheberakh), forms (freylekhs and doinas), instrumentation, and rhythms all contribute to create a unique style. Three musical works for clarinet are examined in the dissertation: Simeon Bellison's Four Hebrew …
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A role for Dopamine neuron NMDA receptors in learning and decision-making
… midbrain dopaminergic nuclei and to the multiple characteristic modes of dopamine neuron firing, tonic and phasic. Phasic transients of midbrain dopamine neurons are widely reported to signal errors conveying discrepancies between predicted and actual reward. Knocking out NMDARs in dopamine …
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Acoustic classification of zooplankton
… measurements of the ocean, the acoustic characteristics of the species of interest must be well-understood. This thesis describes the development of both feature based and model based classification techniques to invert broadband acoustic echoes from individual zooplankton for scatterer …
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Mutual Coupling Reduction Techniques for Multi-band Base Station Antennas
… antenna (BSA) arrays for improved radiation characteristics. Array face densification without the proposed techniques leads to undesirable interactions between arrays and radome cover. This research is supported by extensive full-wave electromagnetic simulations, characteristic mode analysis, …
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Design of Miniature Low-Cost Antennas for Compact Low-Data-Rate IoT Terminals
Internet of Things (IoT) is a modern breakthrough technology driving the creation of a hyper-connected, intelligent world, where ubiquitous IoT devices gather and exchange data for monitoring, tracking, and control purposes. It is already being deployed across diverse sectors, such as logistics, …
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Piezoelectric Control of Structures Prone to Instabilities
… These are prone to buckle in a variety of modes with strong possibility of adverse interaction under axial compression and/or bending. Optimally designed stiffened panels, at an appropriate combination of axial compression and suddenly applied lateral pressure undergo large amplitude …
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Study of Coulomb collisions and magneto-ionic propagation effects on incoherent scatter radar measurements at Jicamarca
… range of small magnetic aspect angles, different modes of magneto-ionic wave propagation are excited. These characteristic modes vary from linearly polarized in the direction perpendicular to B (Cotton-Mouton regime) to circularly polarized at aspect angles greater than 0.5 deg (Faraday rotation …
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Superdirectivity and the Application of Complementary Split Ring Resonators in Directivity Enhancement of Millimeter-Wave Antennas
… Systemic design approaches are presented using characteristic mode analysis, small dipole modeling, and transmission line theory for a time efficient design process. Additionally, to overcome matching the high input impedance and improve the directivity bandwidth, a Yagi-like array …