东南大学学报（英文版）2025，Vol.41Issue(3)：366-374,9.DOI:10.3969/j.issn.1003-7985.2025.03.012
植入式脑机接口电极的频率优化
Frequency optimization for electrodes in implantable brain-computer interfaces
摘要
Abstract
Fully implanted brain-computer interfaces(BCIs)are preferred as they eliminate signal degradation caused by interference and absorption in external tissues,a common is-sue in non-fully implanted systems.To optimize the design of electroencephalography electrodes in fully implanted BCI systems,this study investigates the penetration and absorp-tion characteristics of microwave signals in human brain tis-sue at different frequencies.Electromagnetic simulations are used to analyze the power density distribution and spe-cific absorption rate(SAR)of signals at various frequen-cies.The results indicate that lower-frequency signals offer advantages in terms of power density and attenuation coeffi-cients.However,SAR-normalized analysis,which consid-ers both power density and electromagnetic radiation haz-ards,shows that higher-frequency signals perform better at superficial to intermediate depths.Specifically,at a depth of 2 mm beneath the cortex,the power density of a 6.5 GHz signal is 247.83%higher than that of a 0.4 GHz sig-nal.At a depth of 5 mm,the power density of a 3.5 GHz signal exceeds that of a 0.4 GHz signal by 224.16%.The findings suggest that 6.5 GHz is optimal for electrodes at a depth of 2 mm,3.5 GHz for 5 mm,2.45 GHz for depths of 15-20 mm,and 1.8 GHz for 25 mm.关键词
脑机接口/电磁仿真/脑电图电极/功率密度/比吸收率Key words
brain-computer interfaces/electromagnetic simulation/electroencephalography electrodes/power den-sity/specific absorption rate分类
信息技术与安全科学引用本文复制引用
陈翰,刘翔宇,程佳君,秦江帆,张雪丽..植入式脑机接口电极的频率优化[J].东南大学学报（英文版）,2025,41(3):366-374,9.基金项目
The Open Project of State Key Laboratory of Smart Grid Protection and Operation Control in 2022(No.SGNR0000KJJS2302150). （No.SGNR0000KJJS2302150）
