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A miniature capsule endoscope based on spiral antenna with wireless sensing capabilities

Published online by Cambridge University Press:  11 November 2024

Xiang-yuan Nan ,
Dao-lian Jiang Open the ORCID record for Dao-lian Jiang [Opens in a new window] ,
Xiu-wei Xuan ,
Jia-jia Xie ,
Yi-wei Hu  and
Xing-qi Liu
Xiang-yuan Nan
Affiliation:
Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China
Dao-lian Jiang*
Affiliation:
Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China
Xiu-wei Xuan
Affiliation:
Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China
Jia-jia Xie
Affiliation:
Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China
Yi-wei Hu
Affiliation:
Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China
Xing-qi Liu
Affiliation:
Tianjin Key Laboratory of Film Electronic & Communication Devices, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, China
*
Corresponding author: Dao-lian Jiang; Email: [email protected]
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Abstract

In this paper, a capsule endoscopy system with a sensing function is proposed for medical devices. A single-arm spiral antenna is designed for data transmission and is combined with the voltage controlled oscillator to achieve sensing capabilities. The designed antenna operates at a 900 MHz industrial scientific medical band. By establishing a three-layer cylindrical model of the stomach, it was concluded that the antenna in the stomach has a high peak gain of −1.1 dBi. Additionally, the antenna achieved a −10 dB impedance bandwidth of 5%. The capsule endoscopy was experimentally measured in both actual stomach and simulated environments. The maximum working distance of the capsule endoscope was measured to be 6.8 m. Additionally, the proposed capsule endoscope was tested for its sensing function using solutions with different dielectric constants. Finally, it was confirmed through link analysis that it has good communication capabilities. The results and analysis confirm that the proposed capsule endoscope can be used for examining gastric diseases.

Keywords

antenna sensorgastric disease testinghigh peak gainimplantable antennaISM bandlink budgetoptimal impedance matchingsingle-arm spiral antennavoltage controlled oscillatorwireless capsule endoscopy
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 16 , Issue 9 , November 2024 , pp. 1488 - 1498
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Copyright
© The Author(s), 2024. Published by Cambridge University Press in association with The European Microwave Association.

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