Vol. 104

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2021-08-26

A Multi-Band Cylindrical Conformal Antenna with Low Specific Absorption Rate for Wireless Medical Capsule Endoscopy

By Zhong Yu, Bingwen He, Xinguo Wu, and Xudong An
Progress In Electromagnetics Research M, Vol. 104, 123-132, 2021
doi:10.2528/PIERM21072601

Abstract

A multi-band cylindrical conformal endoscopy antenna with low specific absorption rate (SAR) is designed for endoscope applications, which covers the Industrial, Scientific and Medical bands (ISM 902-928 MHz, 2.4-2.4835 GHz), Medical Device Radio Communications Service band (MedRadio 401-406 MHz) and Wireless Medical Telemetry Service (WMTS 608-614 MHz). The proposed antenna radiates as a symmetrical meanderline structure with a center loaded parasitic opened-loop element, which is bent into the cylindrical conformal shape and wrapped onto the inner wall of the capsule shell. The parasitic opened-loop element excites low frequency resonance at 403 MHz and reduces the SAR values of the antenna. The measured relative bandwidth (|S11| < -10 dB) of the antenna implements 133% ultra-wideband, ranging from 0.35 GHz to 1.76 GHz, and 39% wideband, ranging from 2.01 GHz to 3 GHz. The peak gains and the peak 1 g SAR values at 403 MHz, 611 MHz, 915 MHz, 2.4 GHz are -26.6 dBi, -18.9 dBi, -11.8 dBi, -11.3 dBi, and 83, 82, 94, 153 W/kg, respectively. The results indicate that the proposed antenna complies well with the human safety standards.

Citation


Zhong Yu, Bingwen He, Xinguo Wu, and Xudong An, "A Multi-Band Cylindrical Conformal Antenna with Low Specific Absorption Rate for Wireless Medical Capsule Endoscopy," Progress In Electromagnetics Research M, Vol. 104, 123-132, 2021.
doi:10.2528/PIERM21072601
http://www.jpier.org/PIERM/pier.php?paper=21072601

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