Ultrawideband Conformal MIMO Antenna With Ferrite-Based Modified Inverted-F Structure for Wireless Capsule Endoscopy Applications

IF 4.8 2区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Antennas and Wireless Propagation Letters Pub Date : 2025-03-30 DOI:10.1109/LAWP.2025.3575376

Yongwei Li;Quanyuan Feng

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引用次数: 0

Abstract

This letter presents an ultrawideband (UWB) conformal multiple-input–multiple-output (MIMO) antenna for wireless capsule endoscopy (WCE) and deep tissue monitoring. The design innovatively integrates a toroidal ferrite substrate with a modified inverted-F structure to achieve a bandwidth of 120.5% (0.31 GHz to 1.25 GHz) by exciting and manipulating multiple modes, covering Industrial, Scientific, and Medical (ISM) bands (433/915 MHz). The antenna, with an unfolded size of 28.27 mm × 5 mm × 1.5 mm, is designed to facilitate integration with capsule components such as batteries and camera. Experimentally verified, the design achieves measured gains of −14.1 dBi and −13 dBi at 433 MHz 915 MHz, respectively, in minced pork and an isolation level greater than 33 dB between elements. Specific absorption rate (SAR) values comply with biocompatibility standards, while MIMO performance metrics [envelope correlation coefficient (ECC) < 0.001, diversity gain (DG) > 9.99 dB] meet communication requirements. This work provides a high-performance solution for sub-GHz in-body high-definition medical imaging transmission.

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基于铁氧体的改进倒f结构超宽带共形MIMO天线在无线胶囊内窥镜中的应用

本文介绍了一种用于无线胶囊内窥镜（WCE）和深部组织监测的超宽带（UWB）保形多输入多输出（MIMO）天线。该设计创新地将环形铁氧体基片与改进的反f结构集成在一起，通过激发和操纵多种模式，覆盖工业、科学和医疗（ISM）频段（433/915 MHz），实现了120.5% （0.31 GHz至1.25 GHz）的带宽。该天线的展开尺寸为28.27毫米× 5毫米× 1.5毫米，旨在方便与电池和相机等胶囊组件集成。实验验证，该设计在433 MHz和915 MHz频段分别实现了- 14.1 dBi和- 13 dBi的测量增益，元件之间的隔离级别大于33 dB。比吸收率（SAR）值符合生物相容性标准，MIMO性能指标[包络相关系数(ECC) < 0.001，分集增益(DG) > 9.99 dB]符合通信要求。本工作提供了一种sub-GHz体内高清医学成像传输的高性能解决方案。

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来源期刊

IEEE Antennas and Wireless Propagation Letters 工程技术-电信学

CiteScore

8.00

自引率

9.50%

发文量

529

审稿时长

1.0 months

期刊介绍： IEEE Antennas and Wireless Propagation Letters (AWP Letters) is devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation. These are areas of competence for the IEEE Antennas and Propagation Society (AP-S). AWPL aims to be one of the "fastest" journals among IEEE publications. This means that for papers that are eventually accepted, it is intended that an author may expect his or her paper to appear in IEEE Xplore, on average, around two months after submission.