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 179 for “"Electromagnetics and Photonics"”.
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Microwave chemical sensing using overmoded T-line designs and impact of real-time digitizer in the system
… collected in a short amount of time using broadband chirp pulse Fourier transform microwave (CP-FTMW) spectroscopy. In this report, we explore the design of reduced size spectrometers focusing on the reduction as well as expansion of operation frequency of the microwave analysis cell, where the …
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Modal based BGA modeling in high-speed package
… "Root-Omega" method applied to cases with smooth and rough conductors is validated using simulations. Error sensitivity analysis is performed to demonstrate the potential errors in the original "Root-Omega" procedure and the error sensitivity is significantly reduced by the proposed …
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Modeling strategies for estimating and suppressing electromagnetic interference and improving power integrity
… of the printed circuit board. Here, simple and accurate inductance models of 2- and 8-terminal capacitors including connections to the power and return plane are developed. Circuit models of the capacitors and layout are created using the partial equivalent element circuit method which …
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Modeling strategy for EMI filter and flyback transformer
… winding technologies have been invented and implemented to reduce the capacitance between the primary side and the secondary side. But the repeatability of the winding is still poor due to the fluctuations of the winding machine. Thus, the resulting conducted emission has a fluctuation …
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A Complex-Envelope FDTD Formulation Using Real-Valued Field-Variables
… of the complex-envelope (CE) representation of band-pass limited sources and their resulting fields increases the allowable time-step in finite-difference time-domain (FDTD) simulations. The complex envelope representation transforms band-pass limited fields and sources to complex-valued low-pass …
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Analysis And Design Of Low Profile Multiband Multifunctional Antenna Arrays
Light-weight phased array antennas for aerospace and mobile applications require utilizing the same antenna aperture to provide multiple functions with dissimilar radiation pattern specifications (e.g., multiband operation for communications and tracking). Multi-functional antennas provide …
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Ring Resonators Intergrating With Dichoric Materials And In Spin-valley Controlled Photonic Topological System
… from optical telecommunications to sensing and imaging. The utilization of photonic circuits emerges as a promising platform for the establishment of advanced communication systems characterized by high speed and large capacity. This advancement is crucial to facilitate fast and efficient …
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High Speed Wavelength Tuning of SGDBR Lasers for Optical Coherence Tomography Applications
… wavelength ramp speeds of swept wavelength OCT and to even exceed the capability of present swept-wavelength OCT source solutions. SGDBR lasers were originally developed for telecommunications applications using Wavelength Division Multiplexing. In the telecommunications application, the wide …
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Standalone Antenna Demonstration System
… essential for cell phones, satellites, radio, and radar among many other important applications. This paper describes the design, assembly, and operation of an antenna demonstration system designed to instill interest in the field of antenna design among high school and undergraduate college …
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Characterization and modeling of ESD events, risk and protection
… ESD scenarios have been specified by the IEC standard and the characterizations of the ESD risk for different scenarios are essential to evaluate the ESD robustness of the devices in the real word. </p><p>The insulation of plastic enclosures provides protection against ESD to the electronic …
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Fast Response Liquid Crystal Devices
… modulators, variable optical attenuators (VOAs) and other tunable photonic devices. The response time of these devices is mainly determined by the employed liquid crystal material. How to obtain fast response for the LC devices is a fundamentally important and technically challenging task. In …
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Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods
… for scientific applications has been evolving and expanding for the decade. GPU's provide an alternative to the CPU in the creation and execution of the numerical codes that are often relied upon in to perform simulations in computational electromagnetics. While originally designed purely to …
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Swept-Frequency Sampled Grating Distributed Bragg Reflector Lasers Optimized for Optical Coherence Tomography Applications
… Tomography (OCT) requires high repetition rate and wide spectral width wavelength tunable sources at a low cost. The sampled grating distributed Bragg reflector (SG-DBR) laser provides wide wavelength tuning range while exhibiting a wavelength switching speed that is among the fastest currently …
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Predicting Surface Scatter Using A Linear Systems Formulation Of Non-paraxial Scalar Diffraction
… diffraction phenomena resulting from random phase variations in the reflected wavefront. The ability to predict these effects is important in a variety of applications including x-ray and EUV imaging, the design of stray light rejection systems, and reflection modeling for rendering …
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Polarimetry Of Random Fields
On temporal, spatial and spectral scales which are small enough, all fields are fully polarized. In the optical regime, however, instantaneous fields can rarely be examined, and, instead, only average quantities are accessible. The study of polarimetry is concerned with both the description of …
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Efficient Use of Photons in a Photobioreactor
… have been used to produce various products and by products ranging from waste water treatment, carbon dioxide fixation, pharmaceuticals, food additives, biofuels etc with varying degrees of success. One of the main impediments for large scale production of these products is an efficient …
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Graphene Based Metamaterials For Terahertz Cloaking And Subwavelength Imaging
… negative refraction, subdiffraction imaging, and even invisibility – which have suggested a wide range of new devices for communications, sensing, and biomedicine. In addition, it has been shown that graphene is amenable to unique patterning schemes such as cutting, bending, folding, and …
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