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 11 of 11 for “"RF Measurements"”.
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Mapping bulk electrical properties with non-contact RF measurements
The human body is composed primarily of dielectric tissue with spatially varying permittivity and conductivity. Traditional MRI does not measure these properties. Instead, the conductivity of the patient is a nuisance, causing unpredictable detuning of coils and field inhomogeneities. This thesis …
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RL-SAR: A Robotic System for Fine-Grained RFID Localization using RL-based Synthetic Aperture Radar
Efficient localization of RFID-tagged items is crucial in scenarios that require tracking and managing a large inventory. Current systems for fine-grained RFID localization have shown limitations since they only collect measurements on a pre-defined trajectory or optimize measurement locations for …
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A new approach to partial discharge measurements for testing electrical insulation systems
… technique and the more recent Radio Frequency (RF) method. Due to the different responses of each system, combined measurement allows additional information on the nature of the PD source to be gained. PD was produced using a number of test cells containing PD sources typically encountered in …
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UAV Based Measurement Opportunities and Evaluation for 5/6G Connectivity of Autonomous Vehicles
… capabilities. Not only is improved wireless performance expected with traditional devices such as mobile phones, but new use cases such as the internet-of-things and autonomous vehicle operation will rely on 5G and future network generations. In such widespread applications, from transportation …
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Cryogenic operation of silicon-germanium heterojunction bipolar transistors and its relation to scaling and optimization
… behavior also helps to investigate the performance limits of SiGe HBTs and provides essential information for further device scaling. Technology computer aided design (TCAD) and sophisticated on-wafer DC and RF measurements are essential in this research. Drift-diffusion (DD) theory is …
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A Location-aided Decision Algorithm for Handoff Across Heterogeneous Wireless Overlay Networks
… the UMTS network's capacity and optimizing performance. The increase in the number of wireless users requires an increase in the number of smaller WLAN cells in order to maintain an acceptable level of QoS. Deploying smaller cells in areas of higher mobility (e.g., campuses, subway stations, …
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Three-Dimensional Heterogeneous Integration for RF/Microwave Applications
High performance RF/mixed signal systems require new interconnect strategies to combine high frequency (microwave/mm-wave) circuitry with silicon mixed-signal and baseband digital processing. In such systems, heterogeneous vertical integration, in which circuits in different technologies can be …
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Interference Modelling and Analysis of OFDM in Wireless Environments
… (e.g. the ISM band), they are more likely to interfere with close proximity systems due to the inherent nature of the unlicensed radio spectrum. Interference is one of the key factors that limit the performance of wireless systems. Therefore, to deliver high-performance wireless systems, …
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Atomically thin microwave biosensors
… thin graphene in a broadband radio-frequency (RF) coplanar waveguide (CPW). To combine both electrochemical and dielectric sensing concepts, a graphene channel is inserted into the CPW, which can then be functionalised using standard chemical processes developed for graphene direct-current (DC) …
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Experimental studies of multipass beam breakup and energy recovery using the CEBAF injector LINAC
… of multipass BBU consisted of a series of RF measurements using a stripline kicker to deflect the beam to excite cavity HOMs and a superconducting cavity as a pickup device to detect HOM signals. The lll (normalized) amplitude of the cavity HOM signal was measured as a function of the …
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Design and Calibration of a RF Capacitance Probe for Non-Destructive Evaluation of Civil Structures
… costs. However, it is often too late to perform low-cost preventative maintenance by the time deterioration becomes evident. Non-destructive evaluation (NDE) methods are potentially among the most useful techniques developed for assessing constructed facilities. They are noninvasive and can …