This dissertation is concerned with the use of fast full-wave electromagnetic methods for modeling high speed interconnects and passive components in advanced electronic packaging. The main contents of this dissertation are twofold； to model the multiple vias of various structures and materials within the parallel waveguide, to evaluate the layered medium Green’s functions for multilayers …
Tag Archive: ElectricityandMagnetism
Mar
11
Magnetically-controlled Fano resonance in wavefunction-coupled QPCs
In this thesis, we describe the observation of a resonant interaction between coupled quantum point contacts (QPCs) that we attribute to a Fano resonance, caused by the self-consistent formation of a bound-state (BS) in one of the QPCs. The presence of this BS (in the “swept QPC”) is detected by making measurements of the conductance …
Mar
09
Analysis, design and implementation of Front-End Reconfigurable Antenna Systems (FERAS)
The increase in demand on reconfigurable systems and especially for wireless communications applications has stressed the need for smart and agile RF devices that sense and respond to the RF changes in the environment. Many different applications require frequency agility with software control ability such as in a cognitive radio environment where antenna systems have …
Mar
09
Application of Metamaterials to the Optimization of Smart Antenna Systems
Recent developments in engineered electromagnetic materials called metamaterials have opened the door to a whole new class of devices and improved performance in existing systems using electromagnetic properties that are beyond those found in nature. These materials can be designed to have spatially varying anisotropic electromagnetic properties which include positive and negative permeability and permittivity …
Mar
08
Characterization of tissue mimicking materials for testing of microwave medical devices
The driving force behind this thesis was the need for developing tissue mimicking materials that can mimic the dielectric properties of various biological soft tissues to aid in the development and testing of electromagnetic medical devices. Materials that can mimic the dielectric properties of human skin, adipose, muscle, malignant and healthy fibroglandular tissue, liver, pancreas, …
Mar
06
Methods for improving finite-difference time-domain (FDTD) simulations of electromagnetic problems
In this dissertation, two methods for improving Finite-Difference Time-Domain FDTD) simulations of electromagnetic problems are presented. It is divided into two main parts: one is stable subgridding schemes, and the other is the convolutional perfectly matched layers CPML) derived by piecewise linear recursive convolution PLRC) technique. First, the basic background of a subgridding scheme is …
Mar
02
High-Speed Hybrid Silicon Mach-Zehnder Modulator and Tunable Microwave Filter
The routing of data electronically within microprocessors is becoming increasingly challenging due to the large volumes of data being transferred. Optical interconnects on silicon are an attractive alternative to traditional electronic interconnects because they provide higher bandwidth and have the potential to be compatible with low cost, high volume, mature CMOS processing. Recent efforts in …
Feb
25
Electromagnetic field calculations for microlens optical systems
Microlenses are becoming more widely used in modern optical equipment. When the microlens diameter is comparable with the incident electromagnetic illumination wavelength, diffraction effects through the microlens aperture dominate and significantly affect the microlens optical properties leading to differences from that predicted by ordinary geometrical optics theory. In this work, the continuous-profile symmetrical biconvex microlens …
Feb
23
Modeling Spintronics Devices in Verilog-A for use with Industry-Standard Simulation Tools
As the semiconductor industry works to integrate increasingly more “non-CMOS” devices onto CMOS ICs, compact model development has become an important step in the circuit/system verification tool flow. This research focuses on the two- and three-dimensional modeling of the physical phenomena that occur in nanoscale magnetic devices. This includes the continuous time dynamics of the …
Feb
16
Information-Theoretic Limits on Broadband Multi-Antenna Systems in the Presence of Mutual Coupling
Multiple-input, multiple-output MIMO) systems have received considerable attention over the last decade due to their ability to provide high throughputs and mitigate multipath fading effects. While most of these benefits are obtained for ideal arrays with large separation between the antennas, practical devices are often constrained in physical dimensions. With smaller inter-element spacings, signal correlation …