Gradient and Huygens’ Metasurface Design and Analysis Based on Transmission Line Theory

Abstract

In this article, a new transmission-line-based analysis is introduced to design the gradient and Huygens’ metasurfaces. In this method, each unit cell of the gradient and Huygens’ metasurfaces is modeled by a transmission line with a specific characteristic impedance and propagation constant. By using this method, a prototype for each of the gradient and Huygens’ metasurfaces is designed and simulated. Each unit cell in the prototype consists of only one magneto-dielectric slab. Due to the difficulty of realizing the magneto-dielectric materials, a special unit cell structure consisting of three dielectric slabs is introduced. A prototype for each gradient and Huygens’ metasurface is designed and simulated. To verify the designed structure, a Huygens’ metasurface prototype is fabricated using Rogers TMM 13i substrate. The measured results are in good agreement with the theoretical results.