动态调控电磁隐身表面

为了实现电磁辐射的有效屏蔽，同时保持高质量的信号传输，提出一种利用超材料结构抑制高频柔性传输线电磁辐射的低反射型方案. 整体结构由传输线、介质间隔层和超材料屏蔽层组成，介质部分均使用柔性材料. 利用超材料对电磁波的调控与吸收能力和小型化的特点，降低辐射波的反射分量，减小对传输性能的影响，并保证传输线的灵活性. 仿真结果表明，工作频带为23.10~28.30 GHz的超材料结构对于分段共面波导传输线可实现平均10.10 dB的屏蔽效能，并在23.49~30.96 GHz和32.98~38.00 GHz保持工作带宽，与实测结果基本一致. 所提出的传输线电磁辐射屏蔽方案具有柔性、小型化和低反射的特点，给柔性电子设备的电磁兼容设计提供了新的可能.

Electromagnetic radiation resulting from PCB/high-density connector interfaces

A low reflection scheme of suppressing electromagnetic radiation is proposed to shield electromagnetic radiation effectively and maintain high-quality signal transmission of flexible transmission lines by using metamaterial structures. The overall structure is composed of transmission line, dielectric interlayer and metamaterial shielding layer. The dielectric parts are made of flexible materials. By taking advantage of the ability to control and absorb electromagnetic waves and the characteristics of miniaturization of metamaterials, reflection component of radiation waves is decreased, influence on transmission performance is reduced, and flexibility of transmission lines is ensured. The simulated results indicate that the metamaterial structure with working frequency band of 23.10−28.30 GHz achieves an average shielding effectiveness of 10.10 dB for segmented coplanar waveguide (SCPW) transmission line, and maintaining transmission bandwidth of 23.49−30.96 GHz and 32.98−38.00 GHz. The measured and simulated results are basically consistent, and the proposed electromagnetic radiation shielding scheme of transmission line has characteristics of flexibility, miniaturization and low reflection, providing new possibilities for electromagnetic compatibility design of flexible electronic equipment.