EBG-Integrated Hexagonal Waveguides for Enhanced EMI Suppression in Extended C-Band Applications

This letter presents a novel application of hexagonal electromagnetic bandgap (EBG) structures—each occupying a unit cell area of 2.1 cm$^{2}$—to suppress electromagnetic interference while preserving airflow in enclosures used for C-band satellite communication at ground stations. Focusing on the extended C band around 4.7 GHz, the proposed design achieves 43 dB suppression at the targeted downlink frequency, effectively shielding sensitive electronics, such as high-performance c omputing systems, even with mandatory ventilation apertures. Unlike prior EBG studies that primarily address antenna or planar electronic designs, this work integrates EBG cells into hexagonal ventilation apertures, forming waveguide-like passages—a concept not previously explored. This approach simultaneously meets the critical requirements of electromagnetic interference (EMI) mitigation and adequate thermal management for satellite ground stations operating within the extended C-band spectrum. The design was validated through simulations in CST Microwave Studio and free-space measurements within an anechoic chamber, yielding strong agreement between theoretical and experimental results. Overall, the proposed EBG-based solution offers a practical and effective means of improving EMI control in extended C-band satellite communication enclosures without compromising ventilation requirements.