Sensitivity Enhancement in Cardio-Pulmonary Stethoscope Applications Through Artificial Magnetic Conductor-Backed Antenna Design

IF 3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Pei-Yu He;Fei-Peng Lai;Yen-Sheng Chen
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Abstract

This paper presents an antenna for the cardio-pulmonary stethoscope (CPS) to improve sensitivity in detecting pulmonary edema. The CPS employs a dual-antenna system for monitoring the transmission coefficient. However, conventional patch antennas used in CPS setups often exhibit limited sensitivity due to frequency detuning. This study addresses this limitation through a two-stage approach. Firstly, the design goals of the CPS antenna are characterized. The results prioritize a broad impedance bandwidth, large half-power beamwidth (HPBW), and high front-to-back ratio (FBR) as key design objectives. Secondly, an antenna backed with an artificial magnetic conductor (AMC) is proposed to meet the specified goals. The fabricated prototype, operating at 2.4 GHz with an AMC size of 81.0 × 81.0 mm 2 , exhibits a fractional bandwidth of 27.6%, a FBR of 18.5 dB, and HPBWs of 60° and 70°. Validation is conducted using phantom models simulating different water content levels. The conventional patch antenna yields transmission coefficients between –49.6 dB and –63.5 dB; in contrast, the proposed antenna achieves transmission coefficients ranging from –35.5 dB to –45.7 dB. The sensitivities for normal and severe water contents are improved by 14.1 dB and 17.8 dB, respectively, indicating higher sensitivity and performance enhancement in CPS remote monitoring.
通过人工磁导体支撑天线设计提高心肺听诊器应用的灵敏度
本文介绍了一种用于心肺听诊器(CPS)的天线,以提高检测肺水肿的灵敏度。CPS 采用双天线系统监控传输系数。然而,由于频率失谐,CPS 设置中使用的传统贴片天线通常会显示出有限的灵敏度。本研究通过两个阶段的方法解决了这一限制。首先,确定 CPS 天线的设计目标。研究结果将宽阻抗带宽、大半功率波束宽度(HPBW)和高前后比(FBR)作为主要设计目标。其次,提出了一种以人工磁导体(AMC)为支撑的天线,以实现指定目标。制造出的原型工作频率为 2.4 GHz,AMC 尺寸为 81.0 × 81.0 mm2,带宽分数为 27.6%,FBR 为 18.5 dB,HPBW 为 60° 和 70°。使用模拟不同含水量的幻影模型进行了验证。传统贴片天线的传输系数介于 -49.6 dB 和 -63.5 dB 之间;相比之下,建议的天线的传输系数介于 -35.5 dB 和 -45.7 dB 之间。正常含水量和严重含水量的灵敏度分别提高了 14.1 dB 和 17.8 dB,这表明 CPS 远程监控的灵敏度更高,性能更强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.80
自引率
9.40%
发文量
58
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