Abstract/Details

Wideband characteristics of Vivaldi antenna arrays


2008 2008

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Abstract (summary)

Over the past two decades, Vivaldi antenna arrays have proven to be versatile solutions for wideband, widescan phased array systems, providing 10:1 bandwidth, or more, with 45 degree scan range. The increasing demand for using Vivaldi antenna arrays in diverse, high-performance systems creates the need to explore new concepts under new perspectives, three of which are addressed here: modularity, low-profile and dispersion.

Modularity introduces a discontinuity in the E-plane that is disruptive to performance in finite as well as infinite arrays. The effect of this discontinuity is studied in greater detail in infinite arrays with modularity of elements and sub-arrays. Based on the underlying physics the severe resonances observed are characterized, and it is concluded that for very large arrays compartmentalization into large sub-arrays mitigates these detrimental effects while achieving some modularity.

Earlier work has shown that dielectric permittivity aids in designing shorter antennas with good bandwidth; here, a new approach utilizing a dielectric cover at the array aperture to improve bandwidth for short antennas is proposed. The technique employs covers of moderate thickness and ensures good match at broadside and scan for an otherwise poorly-matched short Vivaldi element.

A framework for analyzing wideband dispersion in antenna arrays is introduced. It is observed that well-matched Vivaldi antenna arrays demonstrate low-dispersion qualities comparable to other well-known wideband arrays, and thus may serve as prime candidates for short pulse transmission systems.

Indexing (details)


Subject
Electrical engineering
Classification
0544: Electrical engineering
Identifier / keyword
Applied sciences; Antenna arrays; Vivaldi antenna arrays; Wideband dispersion
Title
Wideband characteristics of Vivaldi antenna arrays
Author
Kasturi, Sreenivas
Number of pages
154
Publication year
2008
Degree date
2008
School code
0118
Source
DAI-B 69/08, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549663560
Advisor
Schaubert, Daniel H.
Committee member
Jackson, Robert W.; Narayanan, Gopal; Vouvakis, Marinos N.
University/institution
University of Massachusetts Amherst
Department
Electrical & Computer Engineering
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3315478
ProQuest document ID
219918692
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/219918692
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