Comparable analysis on frequency selective surface (FSS) structures using finite FDTD in FORTRAN and CST

In this work, two dissimilar forms of frequency selective surface (FSS) shaped are consider designing in Computer Simulation Technology (CST) and FORTRAN simulator. Square loop FSS is the first design and followed by the cross dipole FSS. The works start using Genetic Algorithm (GA) as the optimization tool to generate bits of the chromosome in designing the shape of energy-saving glass (ESG). Then, another way is using the Finite Difference Time Domain (FDTD) was working as a design the complicated shape in pixelized shape based on the unit cell thought. For the result, it can compare on several performance parameters. Firstly, in CST, the results of S21 shown - 43.2 dB as resonant frequency is at 12.8 GHz. For FORTRAN simulator, it shows the performance of - 68.1 dB at 12.8 GHz of resonant frequency