Numerical Analysis of Electromagnetic Radiation/Scattering Problems from Large Array Structures

• Main Authors: Hsien-Kwei Ho, 何賢奎
• Other Authors: Hsing-Yi Chen
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/55378620361869778462

碩士 === 元智大學 === 電機工程研究所 === 89 === Development of novel analysis techniques to treat large array problems has been great efforts of researchers in years due to the increasing trend to employ very large array structures in the practical applications. Numerical analysis is most attractive due to its reliable accuracy, but it suffers from inefficiency for large array structures. This thesis presents two approaches that potentially overcome the inefficiency of conventional numerical technique of Moment Method (MoM) in terms of computational complexity and memory storage. The first approach generalizes the forward-backward method (F-BM) to treat array structure with arbitrary element shapes, and allows the F-BM to treate more general array problems The advantages of F-BM includes fast convergence in iterative computation, and O(N) memory requirement and computational complexity. The second approach employs Discrete Fourier Transform (DFT) representation for MoM unknowns, and integrates with MoM procedure. Through a ray interpretation of the induced currents on array surface, significant DFT terms are identified, which in general is only a small portion of MoM unknowns. The advantages include significant reduction on the number of unknowns in MoM, and efficient computation on the mutual impedance and radiation patterns in terms of ray decompositions, where only a few rays can accurately predict the values. Finally, an array problem of microstrip patch antennas is studied as well in this thesis.