材料科学
电磁屏蔽
碳纳米管
电磁干扰
电磁干扰
复合数
导电体
吸收(声学)
复合材料
纳米管
光电子学
电信
计算机科学
作者
Byeongjin Park,Sosan Hwang,Horim Lee,Yeonsu Jung,Taehoon Kim,Suk Jin Kwon,Dong Soo Jung,Sang Hyup Lee
标识
DOI:10.1002/adfm.202406197
摘要
Abstract The revolution of millimeter‐wave (mmWave) technologies is prompting a need for absorption‐dominant EMI shielding materials. While conventional shielding materials struggle in the mmWave spectrum due to their reflective nature, this study introduces a novel EMI shielding film with ultralow reflection (<0.05 dB or 1.5%), ultrahigh absorption (>70 dB or 98.5%), and superior shielding (>70 dB or 99.99999%) across triple mmWave frequency bands with a thickness of 400 µm. By integrating a magnetic composite layer (MCL), a conductive patterned grid (CPG), and a double‐walled carbon nanotube film (DWCNTF), specific resonant frequencies of electromagnetic waves are transmitted into the film with minimized reflection, and trapped and dissipated between the CPG and the DWCNTF. The design factors for resonant frequencies, such as the CPG geometry and the MCL refractive index, are systematically investigated based on electromagnetic wave propagation theories. This innovative approach presents a promising solution for effective mmWave EMI shielding materials, with implications for mobile communication, radar systems, and wireless gigabit communication.
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