arXiv eess.SP· Pouya Faeghi, Xiaoting Jia, Jeffrey S. Walling·· 4 小时前AI 评分22
研究测量脑仿体与离体脑组织中近距离微波探针耦合
Short-Range Microwave Interprobe Coupling in a Brain-Mimicking Phantom and Ex-Vivo Brain
AI 导读
研究表征了一种印刷微带馈电、寄生条加载的锥形缝隙耦合探针，仅 12-mm 导线部分插入介质。在琼脂-明胶-生理盐水脑仿体中，6.3 GHz 附近传输系数提升约 16 dB，离体山羊脑的 5 次以上测量在 5.78-6.86 GHz 内与仿体响应相差约 1.5 dB 以内。全波剂量学预测约 0.49 W 输入功率下峰值 1-g 平均 SAR 为 1.05 W/kg。
正文 · 原文
Abstract:Objectives: Short-range wireless links (microwave range) between closely spaced devices in brain tissue are relevant to neural interfaces and intracranial sensing, yet the change in coupling between two such devices caused by a finite volume of brain-like tissue has rarely been measured directly. Technology or Method: This work characterizes a printed, microstrip-fed, parasitic-strip-loaded tapered-slot coupling probe in which only a partially inserted 12-mm wire enters the medium, while the printed structure remains outside. Results: Two fabricated probes showed a measured free-space -10-dB reflection band of 5.78 to 6.86 GHz and a fractional bandwidth of approximately 17.1%, consistent with full-wave simulation. In a controlled two-probe experiment, a homogeneous agar-gelatin-saline brain-mimicking phantom was introduced and removed while the probe arrangement and measurement conditions were retained. Introducing the phantom increased the measured transmission coefficient near 6.3 GHz by approximately 16 dB, and this differential was reproduced across repeated trials. More than five measurements in ex vivo goat brain followed the phantom transmission response within approximately 1.5 dB across the 5.78-6.86-GHz band. Time-domain analysis of the phantom-present link gave a system root-mean-square delay spread of approximately 210 ps. Full-wave dosimetry predicted a peak 1-g-averaged specific absorption rate of 1.05 W/kg for approximately 0.49 W accepted power. Conclusions and Clinical or Biological Impact: These results provide an experimentally validated reference for short-range probe coupling in brain-like media and support phantom-based bench evaluation of minimally invasive intracranial probes before in vivo studies.
| Comments: | 8 pages, 10 figures, 3 tables |
| Subjects: | Signal Processing (eess.SP) |
| Cite as: | arXiv:2610.16026 [eess.SP] |
| (or arXiv:2610.16026v2 [eess.SP] for this version) | |
| https://doi.org/10.48550/arXiv.2610.16026 arXiv-issued DOI via DataCite |
Submission history
From: Jeffrey Walling [view email]
[v1]
Mon, 12 Oct 2026 00:52:18 UTC (4,262 KB)
[v2]
Fri, 23 Oct 2026 11:21:57 UTC (4,263 KB)
来源：arXiv eess.SP · arxiv.org