PhD case studies
Surrey and the NPL offer a number of joint PhD studentships every year, supported by the Postgraduate Institute for Measurement Science.
Nonlinear Microwave Metrology for 5G Mobile Communication Circuits
Part of a £1.5million project funded through the European Association of National Metrology Institutes (EURAMET), this project aims to develop traceable metrology for 5G mobile communications devices, focusing on metrology at the component and sub-system level where hardware impairments affect capacity.
A key objective of the research is to establish traceability for nonlinear network measurements (X-parameters and S-functions), supporting uncertainty relationships and model extraction parameters (e.g. for nonlinear behavioural models) over a wide frequency range at the design stage.
The techniques developed should enable design validation to be achieved in future using signals with the correct waveform and statistics, rather than traditional CW testing.
Nonlinear Microwave Metrology for Next Generation Wireless Systems
The need for international traceable standards and methodologies – in order to be able to compare nonlinear measurement at various sites, control efforts and understand how these errors propagate into parameters of nonlinear models – is becoming essential as more demands are placed on power amplifiers to support 5G wireless networks.
Power amplifiers are especially demanding because they must be efficient without introducing nonlinear distortions during amplification of signals.
This project aims to help develop a generalised approach for measuring and modelling nonlinear devices and systems, which will involve identifying uncertainties in the measurements and modelling extraction parameters.
The research will include interface with commercial systems (both hardware and software) used by manufacturing companies, including UK SMEs and global instrumentation companies.
High-Frequency Electromagnetic Measurements and Modelling of Extreme Impedance Devices
This project is focused on establishing the measurement techniques required for the characterisation, modelling and design of both power transistors used in 5G networks, and nano and quantum devices that exploit high-frequency electromagnetic behaviour.
Both these fields require precise electromagnetic characterisation of devices because of their extreme impedances (opposition to a current).
Developing new measurement capabilities will enable the high-frequency properties of these devices to be characterised accurately – either in terms of their intrinsic physical behaviour, or their designed performance.