Analysis of Electric Field Distribution on Artificial Magnetic Conductor: Via Bowtie Shape

This paper presents a detailed study of the influence of the geometric shape at the resonance frequency of the AMC through the analysis of the electric field distributions on the surface metal patch inside the unit cell. It is known that various parameters such as geometry, dielectric substrate thickness, gap between patches, length and width of patch, size of unit cell, permittivity and permeability strongly affect the resonance frequency. In attempts to elucidate the miniaturization process, as reference, a square patch with a unit cell of size 10 mm x 10 mm has simulated and a resonance frequency of 5.75 GHz has obtained. The device has illuminated by a plane wave with polarization in the y direction. The following geometric shapes were performed: square, circle, hexagon, meander and bowtie. We realized that the field distribution can be used as an physical insight to understand the operation of the metasurface miniaturization process. In particular, bowtie geometry provided considerable electrical miniaturization compared with square patch, about 1.5 GHz. The results are supported by finite element method, using the commercial software COMSOL Multiphysics. Our findings suggest that net induced electric polarizability at edges of metal patches is the principal cause of shift at resonance frequency. Two bowtie shapes are proposed and has provided considerable electrical miniaturization, about 1.5 GHz, compared with square patch to the same dimension unit cell. Therefore, this letter present and propose a novel methodology to study and search geometries, based on analysis of electric field distribution.