Design of Conformal Spiral Dual-Band Antenna for Wireless Capsule System

Kuo Liu,Kanglong Zhang,Chao Fan,Wenjie Cui,Erping Li,Hongxing Zheng,Mengjun Wang,Ruipeng Liu

doi:10.1109/access.2021.3106735

Kuo Liu, Kanglong Zhang + Show 6 more

Open Access

https://doi.org/10.1109/access.2021.3106735

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Abstract

This paper presents a conformal spiral antenna that is miniaturized and with dual-resonant for the wireless implantable capsule system. The spiral antenna conforms to a swallowable capsule with a radius of 3 mm and a length of 26 mm without occupying the internal space of the capsule. The compact antenna adopts two spiral arms to extend the effective current path for miniaturization. Biocompatible flexible polyimide was used as the dielectric substrate and capsule shell, achieving conformal properties of the antenna as well as compatibility with human tissue. The antenna has been simulated in different environmental models. The bandwidth of the antenna can reach 39.16 % (1.82 GHz-2.76 GHz) and 12.06 % (5.36 GHz-6.06 GHz) at 2.4 GHz and 5.8 GHz. The maximum gains of −35.2 dBi and −28.1 dBi can be achieved at 2.4 GHz and 5.8 GHz, respectively. In addition, the transmission characteristics of the antenna were experimentally verified in the minced pork and pig intestine. By analyzing the communication link, the communication distance between transceivers at 2.4 GHz and 5.8 GHz can meet 14 m and 5 m. These results show that the proposed antenna is suitable for wireless implantable capsule systems.

Highlights

IntroductionWireless technology is widely used in implantable medical devices as it gets rid of the body from the limitations of wired devices [1]
This paper presents a conformal spiral antenna that is miniaturized and with dual-resonant for the wireless implantable capsule system
The transceiver distance reaches 14 m and 5 m when the communication link margin reached more than 20 dB at 2.4 GHz and 5.8 GHz

Summary

Introduction

Wireless technology is widely used in implantable medical devices as it gets rid of the body from the limitations of wired devices [1]. The wireless implantable capsule is promising to be used in the digestive system as a capsule speculum, and the heart as a cardiac pacemaker as long as changing its internal structure. With the development of medical technology, the demand for the transmission of real-time video is greater than for the transmission of simple pictures [6]. The transmission antenna with a wideband should be designed to meet the transmission needs of the implantable capsule system to be able to transmit video and other big data signals in real-time. Designing a dual-frequency and broadband implanted antenna has important research value and significance.

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