A four-beam E-plane horn antenna design incorporating a wire-based metamaterial

• Main Authors: Liu, Hung-Wan, 劉鴻萬
• Other Authors: Hwang, Ruey-Bing
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/93070074327474985814

碩士 === 國立交通大學 === 電信工程系所 === 97 === In this thesis, we reported a four-beam E-plane horn antenna incorporating a wire-based metamaterial. Such a metamaterial is made up of metallic cylinders organized in a two-dimensional square lattice. After properly designing the lattice constant and unit cell pattern, we synthesized a medium having the effective refractive index smaller than unity. Therefore, once waves within the metamaterial were excited, the refractive wave tends to be perpendicular to that of the interface between metamaterial and uniform medium. Based on this concept, a 4-way power divider was design to equally distribute the input power into four different directions. We then guide each of the power into individual E-plane flared opening to radiate a directional beam pattern in each sector. In addition to the theoretical calculation regarding the dispersion- and phase- relation of the two-dimensionally periodic medium, we fabricated this antenna and measured its radiation characteristics including the return loss and far-field pattern. The excellent agreement between the measured and simulated results was obtained. Due to the properties of robust, low-loss, and low-cost, this antenna may have promising application in a point-to-multiple-point radio link system.