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 9 of 9 for “"time-modulated"”.
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Time-Modulated Array Testbed Prototype for Multibeam Spectrometry
… the development of a prototype testbed for real-time experimental studies of time-modulated arrays (TMAs). The design includes in-lab development of antenna elements, systems development of the heterodyne receiver architecture, and development of firmware and software for receiving and analyzing …
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Nonlinear and Time-Modulated Metamaterials: Applications at Microwave Frequencies
… properties, invoking nonlinear elements and/or time-modulating some of the material parameters, linearity and/or time-invariance can be broken in metamaterials, enabling extraordinary wave phenomena that open opportunities for the microwave engineering community, including the creation of …
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Wave Engineering in Time Modulated, Nonlinear, and Anisotropic Metamaterials
… results inaccessible in conventional linear, time invariant (LTI), passive and isotropic media. In this work, I will explore, numerically and experimentally, the possibility of realizing devices that perform beyond or close to their fundamental LTI limitations by adding periodic modulation, …
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Innovative strategies for the synthesis of Time-modulated antenna systems
In the framework of the synthesis of time-modulated array antennas for communication purposes, the thesis focuses on the analysis and the development of innovative approaches aimed at reducing the power losses related with the undesired harmonic radiations. The accurate analysis of the problem in …
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Design and modelling of beam steering antenna array for mobile and wireless applications using optimisation algorithms. Simulation and measrement of switch and phase shifter for beam steering antenna array by applying reactive loading and time modulated switching techniques, optimised using genetic algorithms and particle swarm methods.
… its specification. Finally, reactive loading and time modulated switching techniques are applied to steer the beam of a circular uniformly spaced antenna array having a source element at its centre. Genetic algorithm (GA) and particle swarm optimisation (PSO) processes calculate the optimal values …
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Kinetics and radiative processes of a xenon and iodine inductive RF discharge at low pressure
… recombination is the precursor process. In a time modulated inductively coupled discharge, the emission of I* decays on the order of hundreds of microseconds due to ion-ion neutralization consistent with the Landau-Zener theory of ion-ion neutralization. Decay of the electron density is also …
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Kinetics and radiactive processes of a XE and I2 inductive RF discharge at low pressure
… recombination is the precursor process. In a time modulated inductively coupled discharge, the emission of I* decays on the order of hundreds of microseconds due to ion-ion neutralization consistent with the Landau-Zener theory of ion-ion neutralization. Decay of the electron density is also …
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Interacting atoms in time-dependent potentials and artificial gauge fields
… in the simulation of artificial gauge fields via time-modulated tuning of system parameters and via the coupling of internal atomic states by Raman lasers. A second aspect will be the study of systems with synthetic dimensions and the effects of the unconventional infinite range interactions that …
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Hybrid classical-quantum optimization algorithms in electromagnetic applications
… Guided by these insights, I introduce time-modulated simulated bifurcation (TM-SB), in which system parameters that are fixed in the classical formulation are deliberately modulated over time, together with a momentum-aware pumping strategy. This time modulation makes the dynamics much …