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<p>This paper presents the first experimental validation of the optimal current grid approximation (OCGA) applied to the design of sparse wire-grid square and triangular trihedral corner reflectors (TCRs) and aims to develop lightweight sparse structures that retain the scattering properties of their solid and wire-grid counterparts. Based on the method of moments, we analyzed the current distribution to identify and remove wires with minimal electromagnetic contribution, utilizing a grid element elimination tolerance of 20% and varying selection thresholds. To validate the proposed approach, prototypes were fabricated and their backscattering cross-sections were measured in an anechoic chamber over the 5–8&#xa0;GHz frequency range. The experimental results demonstrated a strong agreement between the sparse structures and the original wire grids, particularly in the main lobe. The study showed that applying OCGA can reduce the mass of TCRs by up to 1.51 times compared to original wire grids. These findings confirmed that OCGA is an effective practical method for designing low-mass, cost-efficient scatterers for weight-critical applications such as satellite systems.</p>

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Experimental Verification of Sparse Wire-grid Trihedral Corner Reflectors Based on Optimal Current Grid Approximation

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Tuan Phuong Dang,
  • Talgat Rashitovich Gazizov

摘要

This paper presents the first experimental validation of the optimal current grid approximation (OCGA) applied to the design of sparse wire-grid square and triangular trihedral corner reflectors (TCRs) and aims to develop lightweight sparse structures that retain the scattering properties of their solid and wire-grid counterparts. Based on the method of moments, we analyzed the current distribution to identify and remove wires with minimal electromagnetic contribution, utilizing a grid element elimination tolerance of 20% and varying selection thresholds. To validate the proposed approach, prototypes were fabricated and their backscattering cross-sections were measured in an anechoic chamber over the 5–8 GHz frequency range. The experimental results demonstrated a strong agreement between the sparse structures and the original wire grids, particularly in the main lobe. The study showed that applying OCGA can reduce the mass of TCRs by up to 1.51 times compared to original wire grids. These findings confirmed that OCGA is an effective practical method for designing low-mass, cost-efficient scatterers for weight-critical applications such as satellite systems.