Modelling the Microwave Transmission of Metal Arrays using Modal Matching

DSpace/Manakin Repository

Open Research Exeter (ORE)

Modelling the Microwave Transmission of Metal Arrays using Modal Matching

Please use this identifier to cite or link to this item: http://hdl.handle.net/10036/3543

Share:                 



Title: Modelling the Microwave Transmission of Metal Arrays using Modal Matching
Author: Taylor, Melita Clare
Advisor: Sambles, J. Roy
Publisher: University of Exeter
Date Issued: 2012-02-17
URI: http://hdl.handle.net/10036/3543
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.
Type: Thesis or dissertation
Keywords: Physicsmodal matchingarraysmicrowave
Funders/Sponsor: BAE Systems Ltd


Please note: Before reusing this item please check the rights under which it has been made available. Some items are restricted to non-commercial use. Please cite the published version where applicable.

Files in this item

Files Size Format View Description
TaylorM_fm.pdf 563.1Kb PDF View/Open Front Matter
TaylorM.pdf 41.55Mb PDF View/Open Full Text of Thesis

This item appears in the following Collection(s)

Browse

My Account

Local Links