Title page for ETD etd-05102011-135042


Type of Document Master's Thesis
Author Baggett, Benjamin Matthew Wall
Author's Email Address bbaggett@vt.edu
URN etd-05102011-135042
Title Optimization of Aperiodically Spaced Antenna Arrays for Wideband Applications
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Pratt, Timothy J. Committee Chair
Davis, William A. Committee Member
Ruohoniemi, J. Michael Committee Member
Keywords
  • optimization
  • helix
  • phased arrays
  • wideband
  • aperiodic
  • Particle Swarm Optimization
Date of Defense 2011-05-03
Availability unrestricted
Abstract
Over the years, phased array antennas have provided electronic scanning with high gain and low sidelobe levels for many radar and satellite applications. The need for higher bandwidth as well as greater scanning ability has led to research in the area of aperiodically spaced antenna arrays. Aperiodic arrays use variable spacing between antenna elements and generally require fewer elements than periodically spaced arrays to achieve similar far field pattern performance. This reduction in elements allows the array to be built at much lower cost than traditional phased arrays.

This thesis introduces the concept of aperiodic phased arrays and their design via optimization algorithms, specifically Particle Swarm Optimization. An axial mode helix is designed as the antenna array element to obtain the required half power beamwidth and bandwidth. The final optimized aperiodic array is compared to a traditional periodic array and conclusions are made.

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