# Generation of Sparse Antennas and Scatterers Based on Optimal Current Grid Approximation
## 9 Conclusions  
In this study, we proposed a novel algorithm based on the OCGA method to generate sparse scattering structures using examples of flat plates, dihedral, and trihedral CRs. The algorithm allows for the reduction in the mass and surface area of the original wire grid structure while maintaining key radiation and scattering characteristics (at least for structures considered properly in this paper). The algorithm demonstrated the ability to reduce the mass and surface area of plate and CR structures by up to two times without altering the scattering properties compared to the original structure in two cases: when the excitation region of the incident wave is unknown and when the wave is excited in a specific region.  
Moreover, the algorithm proved to be computationally efficient compared to traditional methods such as perforation or using silver-coated textiles. It significantly reduces the number of unknowns and computational complexity, thus saving computational costs. By optimizing structural parameters (the number of wires after sparsing), the algorithm also helps save materials without deforming the structure.  
The obtained results were further validated by comparison using MoM with PBF-based WG, showing that the scattering properties of the sparse structures remained consistent with the original WG structure, confirming the accuracy and stability of the algorithm in practice. Additionally, the selection of GEET values and thresholds for creating final structures was discussed based on manufacturing conditions. Clearly, the proposed algorithm is effective in generating sparse plate, dihedral, and trihedral corner reflector structures at low manufacturing cost using simple manufacturing techniques.  
However, this first step in investigating the new algorithm opens some directions of studies relevant in the future. Specifically, the algorithm has potential applications for more complex scattering structures. Finally, a more detailed study of GEET influence on the scattering characteristics would be valuable for real-world applications. Future research will also focus on refining the algorithm to free-wire connections and improving the speed of sparse structure generation when the wave is excited in a wide region.  
Conceptualization, T.P.D. and A.F.A.H.; methodology, T.P.D. and M.T.N.; software, T.P.D. and M.T.N.; validation, T.P.D., M.T.N. and A.F.A.H.; formal analysis, T.P.D., M.T.N. and A.F.A.H.; investigation, A.F.A.H. and T.R.G.; resources, T.R.G.; data curation, T.P.D., M.T.N. and T.R.G.; writing--original draft preparation, T.P.D., M.T.N. and T.R.G.; writing--review and editing, T.P.D., M.T.N. and T.R.G.; visualization, T.P.D. and M.T.N.; supervision, A.F.A.H. and T.R.G.; project administration, A.F.A.H. and T.R.G.; funding acquisition, T.R.G. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Ministry of Science and Higher Education of the Russian Federation project FEWM-2023-0014.  
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to the funding organization policy.  
The authors declare no conflicts of interest.