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Showing 1 to 20 of 21 for “"Characteristic Mode"”.
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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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A characteristic mode perturbation approach for antenna loading design
… approaches based on experience, intuition, and modeling are challenged as the demand grows for antennas with increased functionality and performance. New systematic design methods are needed that can manage complicated performance tradeoffs while providing physical insight into the fundamental …
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Electromagnetic Characterization of Complex-Shaped Carbon Nanotubes Using Characteristic Mode Analysis
… we calculate the electromagnetic scattering characteristics of carbon nanotubes with complex shapes. Moreover, we quantify the electromagnetic response of these complex carbon nanostructures using Characteristic Mode Analysis (CMA). CMA decomposes the current of a scatterer in terms of a set …
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Scalable Acceleration of The Characteristic Mode Analysis Computational Toolbox Using Big Data Techniques
Characteristic Mode Analysis (CMA) is used in the design and analysis of a wide range of electromagnetic devices such as antennas and nano-structures. CMA provides physical insight into a target's electromagnetic response by analyzing its Method of Moments (MoM) complex impedance matrix at every …
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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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A Characteristic Mode Analysis of Conductive Nanowires and Microwires Above a Lossy Dielectric Half-Space
… electromagnetic response, we evoked the Characteristic Mode Analysis (CMA) which decomposes the current on the wire into a superposition of fundamental current modes. These modes are weighted by two coefficients: (i) the relative importance of each mode at a certain frequency, termed …
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An analysis of the bandwidth oscillations caused by finite ground planes using characteristic mode theory
… element. This structure is then analyzed using characteristic mode theory to correlate the modal behavior of the ground plane with the bandwidth minima and maxima. Overall, bandwidth minima occur for ground plane sizes where only one mode has the highest modal significance across the band, and …
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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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Characteristic Mode Analysis of Crumpled Graphene Flakes and A New Green’s Functions Evaluation Method for Layered Media
… was to quantify the electromagnetic scattering characteristics of individual crumpled GFs with shapes resembling those found in real composites. The extinction cross sections of tens of GFs, with different sizes and various levels of crumpleness, were calculated using multiple independent …
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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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Numerical green's function in surface integral equation method and hydrodynamic model for solar cell analysis
… (A-EFIE) for low-frequency problems and the characteristic mode analysis (CMA) for conducting objects with inhomogeneous background. The NGF of inhomogeneous media is purely independent with SIE which can be obtained by a variety of differential equation solvers with an arbitrary boundary …
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A Conceptual Model for the Professional Practice of Seventh-day Adventist Educational Administration Based on the Proclamations of the Three Angels of Revelation 14
… Adventist administrator must define a suitable mode of practice, the question must be addressed; does the Seventh-day Adventist religion require a distinctive mode of practice or simply suggest a characteristic approach to a common mode of practice?</p> <p><em> Method</em>. While the Seventh-day …
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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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Geometry-Aware Methodology for Coupling Mechanism Analysis and Radiation Mechanism Analysis
… partial element equivalent circuit (rPEEC) model. The proposed method can quantify the capacitive and inductive coupling between the layout partitions and offers a clear physical understanding of the coupling study.</p> <p>The dipole moment is a popular equivalent noise source for digital …
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Superdirectivity and the Application of Complementary Split Ring Resonators in Directivity Enhancement of Millimeter-Wave Antennas
… directivity bandwidth is rarely addressed in modern work. Accordingly, the main aim of this thesis is creating dynamic designs that are easily tuned to different radiation and bandwidth requirements. Initially, a superdirective antenna is developed using a new approach. Complementary split …
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Design and Detection Process in Chipless RFID Systems Based on a Space-Time-Frequency Technique
… the singularity expansion method (SEM) and the characteristic mode theory (CMT), a systematic design process is introduced by which the resonant and radiation characteristics of the tag are monitored in the pole diagram versus structural parameters. The antenna is another component of the …
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RF coupling to realistic wire systems in complex environments
… load terminations. In this work, we adapted the Characteristic Mode Analysis (CMA) to quantify the variations in R.F. coupling with the DUT’s orientation. CMA decomposes the currents excited on the DUT by the impending electromagnetic waves in a set of fundamental modes. CMA is used to identify …
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Characteristic Modes for Impedance Matching and Broadbanding of Electrically Small Antennas
… goal is to describe a new, complete framework to model the fundamental behavior 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, …
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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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TIME, IDENTITY AND NATION IN GERMAN TRAVEL WRITING ON AFRICA 1848-1914
… his German-African encounters and so produced a characteristic mode of travel writing. These works reflect not only the author’s experience of their own identity, but also represent Germany’s evolving sense of national identity during a period of extensive internal political turmoil which saw the …
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