Doctoral Dissertations

Abstract

"In the past several decades, a number of microwave imaging techniques have been developed for detecting embedded objects (targets) in a homogeneous media. New applications such as nondestructive testing of layered composite structures, through-wall and medical imaging require more advanced imaging systems and image reconstruction algorithms (post-processing) suitable for imaging inhomogeneous (i.e., layered) media. Currently-available imaging algorithms are not always robust, easy to implement, and fast. Synthetic aperture radar (SAR) techniques are some of the more prominent approaches for image reconstruction when considering low loss and homogeneous media. To address limitations of SAR imaging, when interested in imaging an embedded object in an inhomogeneous media with loss, two different methods are introduced, namely; modified piecewise SAR (MPW-SAR) and Wiener filter-based layered SAR (WL-SAR). From imaging system hardware point-of-view, microwave imaging systems require suitable antennas for signal transmission and data collection. A reconfigurable antenna which its characteristics can be dynamically changed provide significant flexibility in terms of beam-forming, reduction in unwanted noise and multiplicity of use including for imaging applications. However, despite these potentially advantageous characteristics, the field of reconfigurable antenna design is fairly new and there is not a methodical design procedure. This issue is addressed by introducing an organized design method for a reconfigurable antenna capable of operating in several distinct frequency bands. The design constraints (e.g., size and gain) can also be included. Based on this method, a novel reconfigurable coplanar waveguide-fed slot antenna is designed to cover several different frequency bands while keeping the antenna size as small as possible"--Abstract, page iii.

Advisor(s)

Zoughi, R.

Committee Member(s)

DuBroff, Richard E.
Pommerenke, David
Donnell, Kristen M.
Richards, Von

Department(s)

Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering

Sponsor(s)

American Society for Nondestructive Testing
U.S. Army Research Laboratory

Publisher

Missouri University of Science and Technology

Publication Date

2013

Pagination

xv, 200 pages

Note about bibliography

Includes bibliographical references (pages 187-199).

Rights

© 2013 Mojtaba Fallahpour, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Synthetic aperture radar
Radar -- Antennas
Antennas (Electronics) -- Design and construction
Microwave imaging

Thesis Number

T 10431

Print OCLC #

876049678

Electronic OCLC #

876049827

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