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24GHz 灵活天线，用于基于多普勒雷达的人体生命体征监测。

24 GHz Flexible Antenna for Doppler Radar-Based Human Vital Signs Monitoring.

机构信息

Department of Electrical and Electronic Engineering, Auckland University of Technology, Auckland 1010, New Zealand.

出版信息

Sensors (Basel). 2021 May 27;21(11):3737. doi: 10.3390/s21113737.

DOI:10.3390/s21113737
PMID:34072148
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8198557/
Abstract

Noncontact monitoring of human vital signs has been an emerging research topic in recent years. A key approach to this monitoring is the use of the Doppler radar concept which enables real-time vital signs detection, resulting in a new class of radar system known as bio-radar. The antennas are a key component of any bio-radar module and their designs should meet the common requirements of bio-radar applications such as high radiation directivity and mechanical flexibility. This paper presents the design of a four-element antenna array on a flexible liquid crystal polymer (LCP) substrate of 100 μm thickness and ε of 3.35. The designed antenna array can be used with a 24 GHz bio-radar for vital signs monitoring in a non-contact manner. It features a relatively compact size of 36.5 × 53 mm and measured gain of 5.81 dBi. The two vital signs: breathing rate (BR) and heart rate (HR) of two human subjects are detected with relatively good accuracy using the fabricated antenna array and radio frequency (RF) output power of -3 dBm from a distance of approximately 60 cm. The effect of bending on the antenna performance is also analyzed.

摘要

近年来，非接触式人体生命体征监测已成为一个新兴的研究课题。这种监测的一个关键方法是使用多普勒雷达概念，它可以实现实时生命体征检测，从而产生一种新的雷达系统，称为生物雷达。天线是任何生物雷达模块的关键组成部分，它们的设计应满足生物雷达应用的共同要求，如高辐射方向性和机械灵活性。本文提出了一种在厚度为 100 μm、介电常数为 3.35 的柔性液晶聚合物（LCP）基板上的四元天线阵列的设计。所设计的天线阵列可与 24 GHz 生物雷达配合使用，用于非接触式生命体征监测。它的尺寸相对较小，为 36.5×53mm，增益为 5.81 dBi。使用所制造的天线阵列和来自大约 60 厘米距离的 -3 dBm 的射频 (RF) 输出功率，可以相对准确地检测到两个人体的两个生命体征：呼吸率 (BR) 和心率 (HR)。还分析了弯曲对天线性能的影响。

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Reconstruction of out-of-plane cardiac displacement patterns as observed on the chest wall during various phases of ECG by capacitance transducer.通过电容换能器重建在心电图不同阶段胸部壁上观察到的平面外心脏位移模式。
IEEE Trans Biomed Eng. 1991 Apr;38(4):383-5. doi: 10.1109/10.133235.
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Compact Wearable Antenna with Metasurface for Millimeter-Wave Radar Applications.用于毫米波雷达应用的带超表面的紧凑型可穿戴天线。
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