Title :
Electromagnetic scattering from obstacles in the near field region of electrically large arrays
Author :
Cetin, Ramazan ; Civi, Ozlem Aydin ; Nepa, Paolo ; Manara, Giuliano
Author_Institution :
Dept. of Electr. & Electron. Eng., Middle East Tech. Univ., Ankara, Turkey
Abstract :
In this paper, an efficient method for the analysis of electromagnetic scattering/radiation from the obstacles nearby electrically large array antennas, with nonuniform excitation, is proposed. The approach is based on the combination of a ray field representation of electrically large arrays and a DFT (discrete fourier transform) based representation of array current distribution. Proposed method is applied to a 2D problem: radiation of a linear array of 2N+1 infinitely long current elements with tapered current distribution in the presence of an infinitely long PEC (perfect electric conductor) cylinder. Accuracy and efficiency of the method is discussed by numerical examples.
Keywords :
antenna arrays; antenna theory; discrete Fourier transforms; electromagnetic wave scattering; array current distribution; discrete Fourier transform; electrically large array antenna; electromagnetic scattering; near field region; nonuniform excitation; perfect electric conductor; Antenna arrays; Current distribution; Discrete Fourier transforms; Electromagnetic analysis; Electromagnetic scattering; Engine cylinders; Linear antenna arrays; Particle scattering; Periodic structures; Radar scattering;
Conference_Titel :
Electromagnetics in Advanced Applications, 2009. ICEAA '09. International Conference on
Conference_Location :
Torino
Print_ISBN :
978-1-4244-3385-8
Electronic_ISBN :
978-1-4244-3386-5
DOI :
10.1109/ICEAA.2009.5297280