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 28 for “"Settore ING-INF/02 - Campi Elettromagnetici"”.
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Innovative Tiling Methodologies for the Synthesis of Phased Array Antennas for Advanced Radar and Communications Systems
… of tiles modules is addressed. By exploiting tiling theorems drawn from the mathematical theory, optimal and sub-optimal methods for the optimization of tiles arrangements and the corresponding excitations minimizing user-defined cost functions are presented. An enumerative approach able …
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Innovative strategies for the synthesis of Time-modulated antenna systems
… of innovative approaches aimed at reducing the power losses related with the undesired harmonic radiations. The accurate analysis of the problem in hand has been used to identify the fundamental parameters involved in the waste of power when the elements of the array are modulated using …
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Innovative Wireless Localization Techniques and Applications
… the interest and the research on location information and services. Location-aware applications are becoming fundamental to a growing number of consumers (e.g., navigation, advertising, seamless user interaction with smart places), private and public institutions in the fields of energy …
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Innovative Techniques for Antenna Synthesis in Modern Wireless Communication Systems
… modern wireless communication systems. By exploiting the advantages given by the use of geometries based on spline and fractal shapes, the aim of the proposed synthesis techniques is the design of small Ultra-Wideband (UWB) and multi-band antennas. The synthesis of UWB antennas is carried out by …
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SVM-based Strategies as applied to Electromagnetics
… of the electromagnetic approaches based on learning-by-example (LBE) techniques, this thesis focuses on the development of a strategy for the solution of complex problems by means of support vector machine (SVM). The proposed instance-based classification method compared to more traditional …
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Distributed Monitoring for User Localization and Profiling in Smart Environment
… distributed systems for distributed monitoring and user localization in smart environment is treated in this thesis. In the last years, a growing amount of attention has been focused on the adoption of Wireless Sersor Networks (WSN) as a scalable and flexible backbone to implement innovative …
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Innovative Combinatorial Strategies for the Synthesis of Radar Tracking Antenna Systems
… the analysis of a method based on the sub-arraying technique aimed at generating an optimal sum and compromise difference patterns through an excitation matching procedure. By exploiting some properties of the solution space, the synthesis problem is reformulated as a combinatorial one to allow …
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Parallel FDTD Electromagnetic Simulation of Dispersive Plasmonic Nanostructures and Opal Photonic Crystals in the Optical Frequency Range
… which are used in many areas of engineering. Plasmonic noble metal nanoparticles are used in order to improve the photovoltaic solar cell efficiency for their forward scattering and electromagnetic field enhancement properties. Photonic crystals are used for example in low threshold …
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Analytical and Experimental Methods for the Characterization of Field Propagation in Non-Standard Conditions
… fully assessed in free space, in standard working conditions. However there exists peculiar propagation environments in which the propagation has not been studied but in which it could be fully exploited in order to assess specic needs or to provide new sensing tools. In particular the research …
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On Applications of Machine Learning In IRS NOMA Architectures For 5G and Beyond
L'abstract è presente nell'allegato / the abstract is in the attachment
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Fast Solutions Strategies for Integral Equations in Electromagnetics with Applications to Brain Computer Interfaces
L'abstract è presente nell'allegato / the abstract is in the attachment
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Predicting Tolerance Effects on The Radiation Pattern of Reflectarray Antennas Through Interval Analysis
The thesis focuses on predicting tolerance effects on the radiation pattern of reflectarray antennas through Interval Analysis. In fact, the uncertainty on the actual size of all parameters under fabrication tolerates such as element dimensions and dielectric properties, are modeled with interval …
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Multilayer Micromachined RF MEMS Filters at Ka and L/S Band For On-Board Satellite Communication Systems
… thesis focuses on the application of micromachining fabrication technologies for the realization of Radio Frequency (RF) bandpass filters. The work has been inspired and supported by the European Space Agency (ESA) Contract No. 22706/09/NL/GLC of the ARTES 5 Workplan 2008 “Micro-machined …
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Novel Design Solutions for High Reliability RF MEMS Switches
… miniaturized networks along with outstanding performances in terms of losses, power consumption and linearity, not really achievable with solid state devices. As requirements for such an application, RF MEMS switches have to survive under extremely harsh environmental and operating …
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High Order Technologies in Boundary Element Methods: Analyses, Algorithms, Applications
L'abstract è presente nell'allegato / the abstract is in the attachment
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SIRIO : Integrated Forest Firesmonitoring, detection and decision supportsystem with low cost commercial sensorssuited for complex orography
… cause a lot of damage, in particular regarding the economic and environmental landscape. In order to monitor a large portion of territory automatically, with a good cost/performances trade-off, it is necessary to develop new early warning systems. We propose a ground-based system with …
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Multi-Resolution Techniques Based on Shape-Optimization for the Solution of Inverse-Scattering Problems
… the framework of inverse electromagnetic scattering techniques, the thesis focuses on the development and the analysis of the integration between a multi-resolution imaging procedure and a shape-optimization-based technique. The arising methodology allows, on one hand, to fully exploit the …
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Unconventional Architectures and Methodologies for Antenna Array Synthesis
Phased array (PA) antennas represent a key enabling technology for current and next-generation wireless systems, yet their large-scale deployment is often discouraged by the cost and complexity associated with fully populated architectures. Within this context, this thesis investigates …
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Printed log-periodic feeds for radar applications
… of electromagnetic waves and works by radiating electromagnetic energy in the space and detecting the echo reflected by the objects (named “target”). The information related to the target is available in the echo signal: the range, or distance, to the target is found from the time it takes …
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Numerical Techniques for the Automated Design of Metasurface Antennas
L'abstract è presente nell'allegato / the abstract is in the attachment
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