Zhang Boyu, Chen Zhijiao
China Unicom Digital Technology Company Limited, Beijing 100032, China.
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Sensors (Basel). 2025 Mar 8;25(6):1675. doi: 10.3390/s25061675.
Running-out detection of the liquids in an infusion bag is important for medical treatment. This paper proposed a simple low-cost sensing scheme with an artificial magnetic conductor (AMC) antenna for liquid-running-out detection in infusion bags. The proposed antenna consists of a dipole antenna supported by an AMC layer. It operates in the 2.4 GHz ISM band in the without-liquid state, in the 2.0 GHz ISM band in the with-liquid state, and can be used for liquid sensing. The AMC layer isolates interference from the surrounding environment such as the standing pole. It also enhances antenna performance and improves monitoring sensitivity. This gives a peak gain of 6.45 dBi and a radiation efficiency of 98% in the without-liquid state. Meanwhile, the with-liquid state can achieve a peak gain of 4.5 dBi and a radiation efficiency of 93%. The proposed antenna is fabricated and measured, verifying its sensing performance of the liquid in the infusion bag. This antenna's design is flexible, compact, precise, and suitable for biomedical wireless sensing.
检测输液袋中的液体耗尽情况对医疗治疗至关重要。本文提出了一种简单的低成本传感方案，该方案采用人工磁导体（AMC）天线来检测输液袋中的液体耗尽情况。所提出的天线由AMC层支撑的偶极天线组成。在无液体状态下，它在2.4 GHz工业、科学和医疗（ISM）频段工作；在有液体状态下，它在2.0 GHz ISM频段工作，并且可用于液体传感。AMC层可隔离来自周围环境（如立杆）的干扰。它还能增强天线性能并提高监测灵敏度。在无液体状态下，这使得峰值增益达到6.45 dBi，辐射效率达到98%。同时，在有液体状态下可实现峰值增益4.5 dBi，辐射效率93%。所提出的天线已制作并测量，验证了其对输液袋中液体的传感性能。该天线设计灵活、紧凑、精确，适用于生物医学无线传感。
