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 65 for “"multiband"”.
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Multimode and Multiband Microstrip Antennas
… describes original work on the broadband and multiband matching of microstrip patch antennas. Microstrip patch antennas suffer from many constraints on their performance. One major restriction is their narrow impedance bandwidth. An effective method to resolve this is adding more resonators to …
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Multiband Observations of Recurrent Novae
Recurrent novae are binary systems which undergo outbursts due to a thermonuclear runaway on a timescale of decades. Two systems, U Scorpii and RS Ophiuchi, are the main focus of this thesis having gone into outburst in 2010 and 2006 respectively. Optical and near-IR spectroscopy of U Sco obtained …
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Efficient Multiband Algorithms for Blind Source Separation
… comparison is made between the proposed multiband scheme and the conventional scheme. The results show that the convergence speed and the signal-to-interference ratio of the proposed scheme are higher than that of the conventional scheme, and the computation cost is lower than that of the …
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RGB and NIR Image Registration for Proximal Multiband Imaging
Accurate monitoring of plant traits is critical to advancing agricultural productivity and sustainability. Multispectral imaging relying on red-green-blue (RGB) and near-infrared (NIR) imagery has become an essential tool in high-throughput plant phenotyping. However, accurate analysis requires …
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Practical realisation of multiband planar filters on multilayer substrates
… on new synthesis and design procedures for multiband responses. In some cases, the possibility to include re-configurable characteristics of these filters is required. The focus of the research is entirely on examining the properties and implications of a previously proposed reactance …
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Studies of real-time multiband adaptive gain hearing aids
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays
… radiation pattern specifications (e.g., multiband operation for communications and tracking). Multi-functional antennas provide advantages over aggregate antenna clusters by reducing space requirements, and can aid in the optimal placement of all required apertures to provide adequate …
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SOME MULTIBAND COMPACT AND COST EFFECTIVE ANTENNAS FOR MOBILE COMMUNICATION APPLICATIONS
… functionality and performance. Novel designs of multiband monopole antennas for mobile communication are introduced and analyzed in the Antennas and Propagation Laboratory at Southern Illinois University Carbondale USA. The antennas proposed here are to support both cellular communication and …
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Multiband RF/Microwave Front-end Receiver Design for Multi-Standard Applications
… of external filters and low noise amplifiers for multiband requirements, a system architecture formed by multiband RF filters and low-noise amplifiers is exploited. Advanced design theory and methodology are proposed in the thesis to the design of the components including bandpass filters, …
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Universal Minimum-Rate Sampling and Spectrum-Blind Reconstruction for Multiband Signals
The dissertation includes three parts: (1) one-dimensional theory and design, (2) two-dimensional theory and design (which is readily extendable to higher dimensions), and (3) application to Fourier imaging. The proposed spectrum-blind sampling and reconstruction theory addresses issues like …
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New Concepts in Front End Design for Receivers with Large, Multiband Tuning Ranges
… in front end design for receivers with large, multiband tuning ranges. Such receivers are required to support large bandwidths (up to 10's of MHz) over very large tuning ranges (30:1 and beyond) with antennas that are usually narrowband, or which at best support multiple narrow bandwidths. …
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Multiband orthogonal frequency division multiplexing for ultra-wideband wireless communication: analysis, extensions and implementation aspects
… spectrum. The subject of this dissertation is Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM) UWB for high data-rate communication. We address four main questions: (1) What are the theoretical performance limits and practical system performance of MB-OFDM? (2) What extensions can …
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Metamaterials for High-Efficiency Photonic Integrated Circuits with Multiband Applications in Quantum and Fibre Communications
The invention of the laser in the early 1960s catalyzed the emergence of a new branch of electrical engineering now known as photonics. Since then, rapid population growth, the accelerated expansion of communication infrastructure, and the development of novel computing architectures have pushed …
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Switched-Tank VCO Designs and Single Crystal Silicon Contour-Mode Disk Resonators for use in Multiband Radio Frequency Sources
… µm HIP6WRF BiCMOS process that could be used in multiband receivers covering the three UNII sub-bands. The first VCO was optimized for low power consumption. The VCO draws a total of 6.75 mA from a 1.8 V supply including buffer amplifiers. The VCO is designed with a switched-capacitor LC tank …
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Triple band dipole antenna with harmonic suppression capability
… a half decade. Wireless devices that operate in multiband frequencies, with smaller size, are now used by almost everyone. In this work, multiband dipole antenna with harmonic suppression capability has been designed. The Triple-band dipole antenna has been vigorous since it is simple, easy to be …
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Dual band dipole antenna with harmonic suppression capability
… a half decade. Wireless devices that operate in multiband frequencies, with smaller size, are now used by almost everyone. In this work, multiband dipole antenna with harmonic suppression capability has been designed. The dual-band dipole antenna has been vigorous, since it is simple, easy to be …
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Sub -Nyquist Multicoset and MIMO Sampling: Perfect Reconstruction, Performance Analysis, and Necessary Density Conditions
… study the MIMO sampling problem, where a set of multiband input signals is passed through a MIMO channel and the outputs are sampled nonuniformly. MIMO sampling is motivated from applications like multiuser communications and multiple source separation. MIMO sampling encompasses several sampling …
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Design, Fabrication, and Measurement of a Multiple-Input Multiple-Output (MIMO) Antenna for Mobile Communication
… design, fabrication and characterization of a multiband uniplanar MIMO antenna for hand-held mobile communication devices on LTE, WLAN, and WMAN networks. The antenna design methodology combined a variety of broadbanding techniques that resulted in a single-layer hybrid monopole antenna coupled …
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Silicon-Based RFIC Multi-band Transmitter Front Ends for Ultra-Wideband Communications and Sensor Applications
… UWB transmitters. Two different methods of multiband frequency generation ----- using switched capacitor VCO tanks and frequency mixing with single sideband mixers ----- are explored in great detail. To generate the required UWB signals, pulse generators are designed and integrated into the …
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