Doctoral Degrees (Electrical and Electronic Engineering)
Recent Submissions
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Simulation and verifcation software for superconducting electronic Circuits
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: The dissertation presents simulation and veri cation software for both high- and low-level de- signs with emphasis on superconducting integrated circuits. A static timing analysis tool called SuperSTA ... -
Large-Scale clustering of acoustic segments for sub-word acoustic modelling
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: A pronunciation dictionary is one of the key building blocks in automatic speech recognition (ASR) systems. However, pronunciation dictionaries used in state-of-the-art ASR systems are hand-crafted by ... -
Real-Time behaviour classification techniques in low-power animal borne sensor applications
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: The ability to study animal behaviour is important in many areas of science, including behavioural ecology, conservation and precision farming. These studies typically employ biotelemetry tags attached ... -
Antenna elements for sparse-regular aperture arrays
(Stellenbosch : Stellenbosch University, 2019-04)ENGLISH ABSTRACT: The central theme of this dissertation regards the design and analysis of antenna elements in sparse-regular aperture arrays (AAs) for radio astronomy applications. Throughout this work, a set of modelling ... -
Phase tracking electronically variable attenuators with receiver protection
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: This dissertation presents the development of a set of optimal phase tracking electronically variable attenuators. Secondly, a compact high power PIN diode limiter is developed and its minimum attainable ... -
Localization and ,litigation of radio frequency interference for interferometric arrays
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: Radio telescopes have increased exponentially in sensitivity ever since the first single dish radio telescopes were built in the 1930's. This trend continues with the development of next generation ... -
Language modelling for code-switched automatic speech recognition in five South African languages
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: Code-switching refers to natural, spontaneous language alternation by multilingual speakers during a conversation or utterance, and is prevalent in everyday conversations by multilingual South Africans. ... -
Variable bandwidth planar coupled resonator filters utilizing tunable non-resonant node inverters
(Stellenbosch : Stellenbosch University, 2018-12)ENGLISH ABSTRACT: This dissertation presents a novel design technique for designing microstrip staircase and pedestal substrate integrated waveguide (SIW) filters with tunable bandwidth. The design technique utilizes ... -
Fast multi-core CEM solvers and flux trapping analysis for superconducting structures
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: The dissertation presents the development of a numerical field solver, called TetraHenry (TTH), for inductance extraction and flux trapping analysis of superconducting integrated circuits. The solver ... -
Magnetic modelling, analysis and on-chip shielding of SFQ Circuits
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: Single Flux Quantum (SFQ) based electronic circuits are susceptible to failure if exposed to external magnetic fields, even in very small quantities. Operating margins of SFQ circuits have shown to decrease ... -
Tunable narrow-band X-band bandpass filters
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: This dissertation proposes two narrow-band tunable X-band filters from different classes, one planar and one waveguide. The first is a suspended substrate varactor-tuned doubly end-loaded staircase filter ... -
A digital low-level radio frequency control system for the particle accelerators at iThemba LABS
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH ABSTRACT: This dissertation presents the design, implementation and evaluation of a digital low-level radio frequency (RF) control system for the cyclotron particle accelerators at iThemba LABS. This system replaces ... -
Characterisation of the dielectric properties of rhinoceros tissue using computer simulation and physical tissue phantom models
(Stellenbosch : Stellenbosch University, 2017-12)Introduction: Understanding the electromagnetic behaviour of in-vivo devices within rhinoceros tissue will aid existing tracking and anti-poaching endeavours and provide new insights into rhinoceros physiology and ... -
Design optimisation of reluctance synchronous machines: a motor and generator study
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: This study focuses on the design and optimisation of the recently popular synchronous reluctance machine. The increase of this machine's popularity is because of its inherent high effciency, with industry ... -
Design optimisation and performance evaluation of flux switching machines for geared medium-speed wind generator drives
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: As wind turbines become large, the cost of energy increases because of the employed drivetrain (geared or direct–drive). Consequently, non–conventional geared medium–speed (MS) generators are gaining ... -
Design and optimisation of direct-driven PM variable-flux synchronous generators for directly grid-connected slip-synchronous wind-turbines
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: This dissertation presents design, optimisation and prototype tests of radial-flux, low-speed, permanent magnet (PM) and copper excited, synchronous generators with a new topology. The designed generators ... -
Smart dock for bicycle protection in theft-prone urban areas
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Cycling, when utilised as a form of transport in an urban environment, holds valuable benefits and sustainable advantages for a wide variety of stakeholders. Various barriers exist that contribute to a ... -
Design of line-start permanent magnet synchronous machines using the Taguchi Method
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: Future energy challenges and global environmental concerns urge the world to focus on energy efficiency programs more than ever. Energy efficiency improvement is an important way to address these challenges. ... -
Contributions to engineering electromagnetics
(Stellenbosch : Stellenbosch University, 2017-12)ENGLISH ABSTRACT: The dissertation presents an overview of the publications of the candidate, and his research group, on engineering electromagnetics — in particular computational electromagnetics (CEM) — which have ... -
Modelling and mitigation of specular multipath interference in a dual-frequency phase comparison FMCW radar system
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT: Digital signal processing technology has improved greatly over the last two decades. Increased processing power, cheaper memory and higher sampling rates have enabled the application of Frequency-Modulated ...
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