Design of broadband circularly polarized antenna for implantable and ingested biomedical devices

IF 0.6 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Electromagnetics Pub Date : 2022-05-19 DOI:10.1080/02726343.2022.2099361

R. Ou, Wei-Lun Yu

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Abstract

ABSTRACT A broadband circularly polarized antenna for implantable and ingested wireless biomedical devices is designed, by loading the compact double semicircular resonant ring. The high electromagnetic energy is collected to generate and enhance the circular polarization characteristics of the antenna, the impedance bandwidth, and axial ratio bandwidth are improved while the volume is reduced. The size of the antenna is reduced to π×(5)2 × 0.635 mm3 with the same bandwidth requirement by introducing T-shaped capacitive loading branch. The performance of the antennas implanted in different human tissues is compared, and the biological compatibility, radiation characteristics, and safety of the antenna are analyzed. In the simulated skin model, the simulation impedance bandwidth is 24.1%, and the axial ratio bandwidth is 18.4%. Finally, the antenna is fabricated and tested in pork. The impedance bandwidth is 23.8%, and the axial ratio bandwidth is 18.6%. The communication ability is evaluated through the external antenna, and the effective transmission distance is 5.5 m. The designed antenna has a simple structure, strong compatibility, and wide functional bandwidth, which can meet the needs of implantable and ingested biomedical devices in the ISM frequency band.

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用于植入式和摄入式生物医学设备的宽带圆极化天线的设计

摘要:通过加载紧凑的双半圆谐振环，设计了一种用于可植入和可摄取无线生物医学设备的宽带圆极化天线。收集高电磁能量产生并增强天线的圆极化特性，在减小体积的同时提高了天线的阻抗带宽和轴比带宽。通过引入t型容性负载支路，使天线尺寸减小到π×(5)2 × 0.635 mm3，带宽要求不变。比较了不同人体组织植入天线的性能，分析了天线的生物相容性、辐射特性和安全性。在仿真蒙皮模型中，仿真阻抗带宽为24.1%，轴比带宽为18.4%。最后，在猪肉中制作并测试了天线。阻抗带宽为23.8%，轴比带宽为18.6%。通过外接天线进行通信能力评估，有效传输距离为5.5 m。设计的天线结构简单，兼容性强，功能带宽宽，能够满足ISM频段内可植入和可摄取生物医学设备的需求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electromagnetics 工程技术-工程：电子与电气

CiteScore

1.60

自引率

12.50%

发文量

审稿时长

6 months

期刊介绍： Publishing eight times per year, Electromagnetics offers refereed papers that span the entire broad field of electromagnetics and serves as an exceptional reference source of permanent archival value. Included in this wide ranging scope of materials are developments in electromagnetic theory, high frequency techniques, antennas and randomes, arrays, numerical techniques, scattering and diffraction, materials, and printed circuits. The journal also serves as a forum for deliberations on innovations in the field. Additionally, special issues give more in-depth coverage to topics of immediate importance. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. Submissions can be made via email or postal mail.