The Design and SAR Analysis of Wearable UWB Antenna for Radiative Near-Field Wireless Power Transfer

2022 IEEE MTT-S International Microwave Biomedical Conference (IMBioC) Pub Date : 2022-05-16 DOI:10.1109/IMBioC52515.2022.9790243

Karthik Kakaraparty, I. Mahbub

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Abstract

This paper presents design of a wearable UWB (ultra-wide band) antenna and its corresponding SAR (specific absorption rate) analysis and power transfer capability estimation when it is placed on a human body. In this work, Polyimide with a thickness of 0.1 mm is used as the substrate material, and gold with a thickness of 200 nm is used for the patch and ground material. The dielectric constant and tangent loss of the polyimide substrate are 3.5 and 0.0002, respectively. The dimensions of the proposed antenna are $30\times 30\times 0.1004\ \text{mm}^{3}$. The designed antenna has the resonating frequency at 3.11 GHz and a bandwidth of 3.06GHz. The near-field gain of the designed antenna is 6.43 dBi. The SAR analysis generated SAR values of 0.138 W/kg and 0.147 W/kg for antenna placed on flat body model and curved body model, respectively, which are within the safe limit of 2 W/kg averaged over 10g of tissue as specified by the ICNIRP (International Commission of Non-Ionization Radiation Protection). This indicates that the antenna is safe and suitable for use in wireless wearable sensors.

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辐射近场无线输电可穿戴超宽带天线的设计与SAR分析

本文设计了一种可穿戴超宽带天线，并对其佩戴时的比吸收率进行了分析和功率传输能力估计。在这项工作中，使用厚度为0.1 mm的聚酰亚胺作为衬底材料，使用厚度为200nm的金作为贴片和接地材料。聚酰亚胺衬底的介电常数为3.5，正切损耗为0.0002。建议天线的尺寸为$30\ × 30\ × 0.1004\ \text{mm}^{3}$。设计的天线谐振频率为3.11 GHz，带宽为3.06GHz。所设计天线的近场增益为6.43 dBi。通过SAR分析，天线放置在平面体模型和曲面体模型上的SAR值分别为0.138 W/kg和0.147 W/kg，处于ICNIRP(国际非电离辐射防护委员会)规定的每10g组织平均2 W/kg的安全限值之内。这表明该天线是安全的，适合用于无线可穿戴传感器。

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2022 IEEE MTT-S International Microwave Biomedical Conference (IMBioC)

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