Modelling the Microwave Transmission of Metal Arrays using Modal Matching

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Modelling the Microwave Transmission of Metal Arrays using Modal Matching

Show simple item record Taylor, Melita Clare en_US 2012-05-25T10:36:40Z en_US 2013-03-21T10:25:47Z 2012-02-17 en_US
dc.description.abstract This work explores the interaction of electromagnetic radiation with periodic metal-dielectric composite materials. In particular, the majority of the studies explore the role of evanescent diffraction in the regime where the wavelength of the incident radiation is of the order of the period of the array just below the onset of diffraction. The underlying aim of the thesis is to build on the current knowledge and gain deeper understanding into the causal mechanism of the electromagnetic response of these periodic materials. Developments in metamaterial research have led to a resurgance of interest in the use of periodic metallic surface to control the transmission of electromagnetic radiation. The response of these surfaces can be `tuned' to provide the required response simply by altering the geometric parameters of the material. Numerical modelling techniques are often used to predict the response of such structures. However, the aim of this work is to gain a deeper understanding of the reasons for the response and therefore an analytical modal matching method has been used. The modal matching method provides the opportunity to extract greater understanding of the resonant phenomena by linking them to specific mathematical terms in the analytical formulation. The modal matching technique is initially used to study the response from a single layer bigrating comprising a square array of square holes in a PEC sheet and its complementary system of a square array of square PEC patches. The importance of evanescent diffraction in both resonant phenomena and tunneling responses is discussed and it is shown that complete transmission (reflection) is supported by these structures even for very high (low) metal occupancy. This technique is extended and adapted to describe a variety of structures in chapters 5 and 6, exploring how resonant excitation of surface waves via evanescent diffraction leads to highly interesting electromagnetic responses. In chapter 7, alternating multilayer stacks of two different subwavelength meshes provide an observable one-dimensional topological mode in a physical system for particular mesh configurations. en_GB
dc.description.sponsorship BAE Systems Ltd en_GB
dc.identifier.uri en_US
dc.language.iso en en_GB
dc.publisher University of Exeter en_GB
dc.subject Physics en_GB
dc.subject modal matching en_GB
dc.subject arrays en_GB
dc.subject microwave en_GB
dc.title Modelling the Microwave Transmission of Metal Arrays using Modal Matching en_GB
dc.type Thesis or dissertation en_GB 2012-05-25T10:36:40Z en_US 2013-03-21T10:25:47Z
dc.contributor.advisor Sambles, J. Roy en_US
dc.publisher.department Physics en_GB
dc.type.degreetitle PhD in Physics en_GB
dc.type.qualificationlevel Doctoral en_GB
dc.type.qualificationname PhD en_GB

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