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.
Results
Showing 1 to 20 of 301 for “"radio frequency (RF)"”.
-
Development of the “Stix” Code, a Radio Frequency (RF) Wave Solver, to Investigate RF-Sheath Behavior in Realistic Tokamak Geometry
… to fusion relevant temperatures is to use radio frequency (RF) waves in the ion cyclotron range of frequencies (ICRF). However, experiments have shown that this technique produces RF rectified sheaths known to form on both the ICRF antenna as near-field sheaths and farther away from the …
-
Study of Multi-Electron Ionization and Charge Exchange in HIBF
… for HIBF, plasma dynamics in a low-energy radio frequency (RF) discharge is studied through the implementation of a new Monte Carlo Collision (MCC) module developed for including into a Particle-In-Cell (PIC) package, The MCC module uses available cross section data for the light ion-atom …
-
Measurement and model of a radio frequency microelectromechanical switch
… One potential application of this process is a radio frequency (RF) MEMS switch. This thesis provides an overview of the measurement and modeling techniques used to verify the functionality of an RF MEMS switch that was fabricated using this process. This thesis confirms that this specific RF …
-
Utilizing I/Q data to enhance radar detection and accuracy metrics
… components, and advanced FPGAs into novel radio frequency (RF) sensors has resulted in significantly increased sensor capabilities while at the same time dramatically increasing the size of the data associated with test events. This work focuses on the development of management tools to …
-
Design of a high quality factor spiral inductors in RF MCM-D
… and fabrication of spiral inductors for use in Radio Frequency (RF) applications. A design methodology is developed to search an inductor design space efficiently using existing simulation software. The methodology allows designers to specify a desired inductance, total area, and frequency of …
-
Design, analysis and validation of electrode-less plasma generator
… the use of electron emission and active feed of radio frequency (RF) signal. The reason for pursuing this was to make plasma devices that are compact, efficient, resilient, and low maintenance. The foundational scientific theory, model, and the simulation were applied in Elmer multi-physics …
-
A Power-efficient Radio Frequency Energy-harvesting Circuit
… to demonstrate the design and simulation of a Radio Frequency (RF) energy-harvesting circuit, from receiving antenna to the point of charge collection. The circuit employs a custom-designed antenna based around Koch fractal loops, selected for their small physical size, good multiband behaviour …
-
Wireless energy monitoring system
… the data (current and voltage) and Xbee Series 2 radio frequency (RF) modules. The circuit that allows the voltage and current readings is based on the schematics provided by the OpenEnergyMonitor project, but with small modifications.
-
A 24-channel radio frequency receive array for magnetic resonance imaging of primates at 10.5 T
… compared to other imaging technologies. The radio frequency (RF) coil is one of the key hardware sub-systems, which drives overall MRI system performance to enable higher resolution imaging and the collection of high fidelity information about organism structure and function. To optimize RF …
-
The effects of non-uniform illumination on the performance of series connected photovoltaic arrays
… is immune to the noise generating effects of Radio Frequency (RF) and Electromagnetic Interference (EMI). Transferring power optically also has the benefit of generating electricity in regions where electrical isolation is required. Using Series Connected Photovoltaic Arrays (SCPA) for voltage …
-
Study of the electromechanic aspects of RF MEM devices with particular emphasis on the dynamic behavior for the case of RF MEM switches and tuneable capacitors
… One of those appealing MEMS applications are Radio Frequency (RF) switches. These devices have some outstanding advantages like low insertion loss, high isolation and linearity, but they suer from some drawbacks like low switching speed and lack of reliability. In the near future for many …
-
Measurements of MRI Induced Heating
… MRI requires the use of a relatively safe radio frequency (RF) signal, which can however be problematic for patients with implantable medical devices. The RF induced heating on twenty-four titanium rods with different diameters, coatings, and lengths, were placed, within a phantom of gelled …
-
Thermally Hardened RF GaN HEMTs in Extreme Environments
… exist that are limited by the temperature performance of silicon devices (<250◦C). This area of high temperature (HT) electronics is an increasingly growing field with critical future applications in geothermal energy, space exploration, hypersonic aircraft, and deep gas/oil drilling, among …
-
Techniques for Efficient Wide-Range Radio-Frequency Power Generation System
Industrial radio-frequency (rf) power applications, e.g. plasma generation for semiconductor processing, are often characterized by the delivery of rf power, at a specific frequency or within a narrow band, with high peak power levels and wide overall power ranges, into loads with varying …
-
Quantifying Nocturnal Itch And Its Impact On Sleep Using Machine Learning And Radio Signals
… consisting of 370 nights of infrared footage, radio-frequency (RF) data, and human annotations of scratching. Using this data, we develop a neural network model that can detect occurrences of nocturnal scratching using only radio signals. The developed model can achieve very high accuracy in …
-
Transmit Precoder Design for Dual-Function Radar-Communication Systems
As radio-frequency (RF) antenna, component and processing capabilities grow, the ability to conduct multiple RF system functions from a common aperture is being realized. Conducting both radar and communications functions from the same system is potentially useful for vehicular, health monitoring, …
-
Internet of Things (IoT) Applications With Diverse Direct Communication Methods
… The IoT devices typically communicate via radio frequency (RF), such as WiFi and Bluetooth. In this dissertation we deeply analyze the various characteristics of different wireless communication methods in terms of range, energy-efficiency, and radiation pattern. We find that a …
-
Real-time adaptive circuitry to support simultaneous radar and communications.
… systems access the electromagnetic spectrum, interference becomes more common. This interference can lead to reduced performance for the involved systems, meaning dropped calls and missed radar detections. To help mitigate this spectral congestion, this work presents technological innovations to …
-
Self-rolled-up membrane (S-RuM) capacitors and filters for radio frequency communication
… passive electronics, photonics, and neural interfaces, and achieves great device size reduction and performance enhancement. For passive electronics, devices based on S-RuM utilize electromagnetic energy well- confined in the device tubular cavity with extremely high efficiency, and break the …
-
Capturing the human figure through a wall
We present RF-Capture, a system that captures the human figure - i.e., a coarse skeleton - through a wall. RF-Capture tracks the 3D positions of a person's limbs and body parts even when the person is fully occluded from its sensor, and does so without placing any markers on the subject's body. In …
Page 1 of 16