The incessant technology scaling has enabled the integration of functionally complex System-on-Chip (SoC) designs with a large number of heterogeneous systems on a single chip. The processing elements on these chips are integrated through on-chip communication structures which p…
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Existing approaches to intrusion detection in imperfect wireless environments employ local monitoring, but are limited by their failure to reason about the imprecise monitoring within a radio environment that arises from unidirectional links and collisions. This compounds the ch…
With recent and continued increases in computing power, and advances in the field of computer graphics, realistic augmented reality environments can now offer inexpensive and powerful solutions in a whole range of training, simulation and leisure applications. One key challenge …
The convergence of microfabrication technologies, novel materials systems, and techniques for chemical and biochemical analysis is enabling the realisation of lab-on-a-chip technology. Products incorporating such technologies are expected to find widespread use, for example in p…
This thesis investigates the electrodeposition of PdNi films with controllable composition and their suitability as electrical contacts in electronic and spintronic devices based on Silicon and Carbon nanotubes (CNTs). The electrodeposition process and characterisation of the el…
As world populations increasingly are clustered in urban areas, so there is a tangible need for accurate mapping of these regions by national mapping agencies. A consequential impact of growing cities is that greater numbers of people across the globe are vulnerable to the effec…
This project concerns the use of an electromagnetic sensor for the detection of leaks/cracks in water pipes. As old metal pipes corrode they start to become brittle, resulting in the potential for cracks to appear in the pipes. In addition corrosion can build up resulting in a r…
In this thesis, approaches for increasing the output power in monolithically integrated semiconductor mode locked (ML) lasers were investigated. The wavelength range considered is the range of operation of low temperature grown GaAs photomixers, devices commonly used for THz gen…
This thesis describes the development and application of statistical circuit simulation methodologies to analyse digital circuits subject to intrinsic parameter fluctuations. The specific nature of intrinsic parameter fluctuations are discussed, and we explain the crucial import…
This research undergone is an inter-disciplinary project with the Civil Engineering Department, which focuses on acceleration of the numerical solutions of Partial differential equations (PDEs) describing continuous solid bodies (e.g. a dam or an aircraft wing). Numerical techni…
This thesis presents the design and characterisation of millimetre-wave Butler matrix beamforming circuits at 63 GHz. A micromachining technique is used to fabricate the tiny structures. The ability to manufacture the circuits at this frequency may benefit to the development of …
A spectrum of phenomena related to the reliability of AlGaN/GaN HEMTs are investigated in this thesis using numerical simulations. The focus is on trap related phenomena that lead to decrease in the power output and failure of devices, i.e. the current collapse and the device de…
This thesis deals with issues pertaining the wireless multicomputer interconnection networks namely topology and Medium Access Control (MAC). It argues that new channel assignment technique based on regular low-dimensional hypergraph networks, the dual radio wireless hypermesh, …
The work described in this thesis concerns the combining of wideband and reconfigurable narrow band functionality into a single antenna. This concept may be useful in reducing size and to give flexibility to a wireless terminal to operate in several different modes. The approach…
The advent of body worn devices and the use of them for a wide range of applications, from entertainment to military purposes, indicate the need to investigate to the behaviour of antennas and wave propagation on the body in depth. Knowledge and understanding and of the on-body …
A planar lightwave circuit (PLC) has been envisioned to provide a new generation of optical networks capable of delivering signal at high speed and bandwidth to the household. High index contrast (HIC) and optical gain in the same material system would substantially enhance inte…
Photovoltaic solar cells (PVs) are now recognised as the world’s fastest growing energy technology, yet, they only account for a mere fraction of current global renewable power capacity. It is acknowledged that this inadequate market penetration has been largely a result of the …
This thesis reports on the development of a novel 77GHz low loss MEMS switch with a mechanically unrestrained armature, over a RF transmitting coplanar waveguide. Electrostatic actuation is used during the switching operation. The attractive force from the electrostatic field is…