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 47 for “"radiation characteristics"”.
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Thermal Radiation Characteristics of Fluidized Solids.
… was apparent for early particle residence times. Radiation plays an increasingly significant role as the time history of the particle contact period proceeds. Contrary to previous suggestions, radiation contributes significantly to the overall energy transfer for the normal operating temperature …
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Radiation characteristics of rigid foam insulation
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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Investigation of antennas with non-reciprocal radiation characteristics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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The Fundamental Resonant Frequency and Radiation Characteristics of Wide Angle Conical Antennas
… the peak radiated electric field and the radiation efficiency of the conical antenna as a function of half cone angle was also explored.
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An Investigation on the Effect of Ground Plane Roughness on Antenna Radiation Characteristics
This work considers the performance of a thin-wire monopole antenna over both a flat ground plane and a randomly-varying rough surface. The Method of Moments with the Electric Field Integral Equation (EFIE) is used to account for all coupling interactions. Monte Carlo averaging is used to compute …
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Modal and radiation characteristics of the crossed-septum dielectric loaded waveguide for wideband applications
… mode resonances. A general case multi-mode radiation analysis is used to identify dominant mode and higher-order mode far-field radiation characteristics. Co- and cross-polarization measurements are performed and show that energy can be largely confined to dominant mode. Under these …
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Analysis and design of planar slot antennas for RFID applications using characteristic mode theory
… UHF band 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 …
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Multifilar Hemispherical Helical Antennas
… shown to yield similar polarization and gain characteristics over a narrow bandwidth but a much larger beamwidth. This investigation examines multifilar hemispherical helices and produces two specific designs with some desirable radiation characteristics. The side-fed quadrifilar helix and the …
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Log-Periodic Loop Antennas
… a log-periodic dipole antenna with comparable radiation characteristics. Several geometries with different parameters are analyzed numerically using ESP code, which is based on the method of moments. A LPLA-GR with 6 turns and a cone angle of 30* offers the most promising radiation …
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Synthesis of Ultra-Wideband Array Antennas
… requires essentially frequency-independent radiation characteristics over the entire bandwidth of the signal in order to avoid distortions. Factors contributing to bandwidth limitation of arrays include array factor, radiation characteristics of the array element, and inter-element mutual …
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Investigation into the design of ultra-wideband (UWB) and multi-band antennas
… in the point of view of reflection coefficient, radiation characteristics, phase response of antenna transfer function and time domain response. For better suiting the compact and body-worn UWB applications, we have investigated the design of CPW-fed printed antenna. We have explored the antenna …
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Design and Analysis of an Electronically Steerable Microstrip Patch and a Novel Coplanar Waveguide (CpW) Fed Slot Antenna Array
… then computing and presenting their full-wave radiation characteristics.</p>
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Analysis and Synthesis of a New Class of Low Side Lobe Planar Arrays
… in the form of some known values of radiation pattern parameters beforehand - information that may not be available when designing arrays. A few analytical methods exist in the literature that can be used to design rectangular lattices of isotropic elements for desired half-power …
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Modified Sierpinski Fractal Antenna
… to optimize in order to get the required radiation characteristics. A systematic study of the original Sierpinski monopole was done to gain an insight on the operation and multi-band behavior of the antenna and a similar study was done to find out why the patch version of Sierpinski lacks …
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Mobile array designs with ANSERLIN antennas and efficient, wide-band PEEC models for interconnect and power distribution network analysis
… of the antenna were designed to influence radiation characteristics. To further reduce the number of components in the array, a very low profile splitter was designed and mounted below one of the antenna elements, doubling as the return plane for the antenna. The partial-element equivalent …
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Mutual Coupling Reduction Techniques for Multi-band Base Station Antennas
… base station 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 …
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Tunable electrically small antenna for next generation ionospheric heating
… dimension. Tuning range, power handling, and radiation characteristics are evaluated for two antenna designs and three tuning methods.
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UWB antenna using indium tin oxide (ITO)
… light weight, easy to feed and their attractive radiation characteristics. In this project, the performance of the UWB antenna characteristics using Indium Tin Oxide (ITO) and AgHT were investigated. Parametric studies were performed to quantify the effect of the ITO and AgHT characteristics as …
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Unconventional Optical Phased Array Design for Next-Generation Wireless Systems
… uniform grid, while preserving or enhancing key radiation or focusing performance such as low sidelobe levels (SLL) and narrow half-power beamwidth (HPBW). Furthermore, for far-field applications, an analytical modeling approach is developed, where the radiation characteristics of the waveguide …
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A Radiation Reconfigurable Magnetic Line Source Antenna: Modeling, Integration With RF MEMS, and Applications
This document presents the work and progress of a radiation reconfigurable microstrip antenna. It has been designed to reconfigure its radiation pattern between broadside and endfire directions. Each configuration operates within an impedance bandwidth common to both states, and the desired …
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