Design principle of cylindrical superdirective antenna. (18th September 2019)

• Record Type: Journal Article
• Authors: Chen, Wan; Fu, Jiahui; Wu, Qun; Lv, Bo
• Is Part Of: Journal of physics. Volume 52:Number 49(2019)
• Publication Date: 2019-09-18
• Subjects: electromagnetic scattering -- cylindrical antennas -- plasmons; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ab3f84
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: We propose the design principle of a superdirective antenna with needle-like radiation based on multi-layered dielectric cylinder. The electromagnetic fields and far-field directivity of superdirective antenna are calculated. The radiation mechanisms of the superdirective antenna are illustrated by multi-layered asymmetric SPR phenomenon. A nonlinear searching algorithm is utilized to calculate the design parameters of the antenna. A series of constraint conditions on the design parameters are derived from the phenomenon. The constraint conditions restrict the initial values of optimization in a limited solution space, and act as a guidance on the optimizing process and improves the convergence and quality of optimization.