Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/137605
Title: ANALYSIS AND DESIGN OF LOW-PROFILE WIDEBAND ANTENNA ARRAYS
Authors: ASHRAF ABDULRAHMAN ADAM SALIH
Keywords: Widband Arrays, Closely Spaced Arrays, Theory of Characteristic Modes, Aperture Excitation, Reverse Scattering, Checkerboard AMC
Issue Date: 10-Jan-2017
Citation: ASHRAF ABDULRAHMAN ADAM SALIH (2017-01-10). ANALYSIS AND DESIGN OF LOW-PROFILE WIDEBAND ANTENNA ARRAYS. ScholarBank@NUS Repository.
Abstract: Wideband antenna arrays becoming increasingly crucial for 5th generation communications and radar systems. The constraints on their size, weight, and profile make them hard to realize. Antenna arrays known as closely spaced arrays (CSA) provide features, such as wide bandwidth (4.5:1 for VSWR < 2) with very low-profile (λ/10) in an infinite array scenario. However, in a medium finite-sized array, the diffraction and truncation of the array reduce the array impedance bandwidth significantly. In this thesis, methods to overcome the finiteness effects on CSA bandwidth and gain using theory of characteristic modes (TCM) are studied and proposed. A new concept to reduce higher-order modes by using metasurface that allows gain enhancement in beam steering cases is proposed. A TCM-inspired aperture excitation technique based on reverse scattering for beam steering is implemented to improve the overall impedance matching. A metamaterial based closely spaced array to improve the array gain-bandwidth is proposed.
URI: http://scholarbank.nus.edu.sg/handle/10635/137605
Appears in Collections:Ph.D Theses (Open)

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