Spectral Performance in Quad-Band Satellite Communication with Triangular Ring Structures
摘要
Stability in multiband operation with appropriate bandwidth is a crucial factor in designing metamaterials to ensure effective performance across various electromagnetic applications. This paper introduces a quad-band unit cell design featuring triangular rings. The unit cell shows negative permeability and a refractive index at four separate frequency bands from 2 GHz to 20 GHz. A 1.5-mm-thick Rogers RT6002 dielectric material is incorporated in the design. The unit cell resonates at 2.8 GHz (S band), 5.7 GHz (C band), 9.8 GHz (X band), 12.2 GHz, and 17.3 GHz (Ku band). The corresponding transmission coefficients (S21) are −40.6 dB, −45.4 dB, −35.9 dB, −34.5 dB, and −42.4 dB, respectively. The effective operating bandwidths are 2.67–2.98 GHz, 5.14–6.19 GHz, 9.58–9.97 GHz, 11.75–12.45 GHz, and 16.05–18.45 GHz, achieving a high effective medium ratio (EMR) of 13.3. The physical and electrical dimensions of the unit cell are 8 × 8 mm2 and 0.075 λ × 0.075 λ, respectively. Numerical parameters are acquired using CST (Computer Simulation Technology) Microwave Studio 2024 software. The design is also validated with HFSS (high-frequency structure simulator) software. Additionally, the equivalent circuit is analyzed in Advanced Design System (ADS) software. The simulation results from CST, HFSS, and ADS are consistent with each other. This close agreement confirms the accuracy of the proposed design. A parametric study of various geometries, split gaps, and substrate properties highlights their effects on resonant frequencies and transmission efficiency. The proposed design demonstrates potential for use in 5G communication and quad-band satellite applications.