5G通信技术的迅速发展和产业化进程给电子设备的电磁屏蔽设计带来了严峻挑战。 5G通信中24 GHz以上的电磁波极易通过电子设备屏蔽外壳上的各种孔缝耦合进入电子设备内部, 影响设备的正常工作。针对常规散热孔设计难于适应5G通信发展需求, 提出了一种介质开孔型频率选择表面(FSS)结构。该结构在不影响设备通风散热的条件下, 实现对 28 GHz频段信号的电磁屏蔽。经过全波分析方法仿真, 所设计的 FSS结构在 28 GHz频段电磁屏蔽效能 (SE)达30 dB以上, 带宽大于2 GHz。无论是 TE还是TM极化电磁波, 在 0°-60°入射范围内具有良好的电磁屏蔽稳定性。

The rapid development and industrialization of 5G communication technology has brought big challenges to the electromagnetic shielding design of electronic systems. Electromagnetic waves operating above 24 GHz in 5G communication can easily couple into the electronic systems through various vent apertures/holes on shielding enclosures. It undoubtedly degrades the system performance. To solve this problem, an electromagnetic shielding structure based on Frequency Selective Surface(FSS) with vent holes through substrate is proposed. The proposed FSS structure meets the requirements of electromagnetic shielding at 28 GHz band without affecting the ventilation. The optimally designed FSS structure through a number of full-wave simulations achieves Shielding Effectiveness(SE) greater than 30 dB at 28 GHz with a bandwidth over 2 GHz. Moreover, the proposed FSS-based shielding structure is not sensitive to the TE or TM polarization of electromagnetic wave in the incident angle range from 0° to 60°.