Programmable metasurfaces and monopole antenna applications

Metalamaterials are materials that have negative dielectric constant (ε) and magnetic permeability (µ). These structures are not found in nature and are obtained artificially in the laboratory environment [1]. In the literature, there are many metamaterial studies such as medical [2], image processing [3], invisibility cloak [4] and antenna [5] [6]. In this study, metasurface structures were used to control the radiation direction of monopole antenna. Some unit cells of the metasurface structure are connected to the metal plate to control the radiation direction of the antenna, increase the antenna's gain and directivity. Designs and simulations are performed using microwave simulator program. Two different mushroom structure surfaces are designed as T model and circular. In addition, artificial neural networks software has been developed for the circular model surface. More than 150 analyzes are performed to evaluate the results of many structures where different unit cells are connected to the metal plate on both of the designed meta surfaces. The S_11 parameters, two-dimensional and three-dimensional radiation patterns of these designs are investigated. Fabrication and measurements are made in the laboratory enviroment. Finally, the artifical neural network software is designed for the circular model study. By using artificial neural networks, it is aimed that the software can train the network and obtain the same results obtained from the simulations of the previous circular metaface automatically in the computer environment without human assistance.