A Zero-Power Ubiquitous Wireless Liquid-Level Sensor Based on Microfluidic-Integrated Microstrip Antenna
A Zero-Power Ubiquitous Wireless Liquid-Level Sensor Based on Microfluidic-Integrated Microstrip Antenna
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DOI：
10.1109/jrfid.2020.3004351
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发表时间：
2020-06
影响因子：
3.1
通讯作者：
Liang Zhu;Nabeel Alsaab;M. Cheng;Pai-Yen Chen
中科院分区：
文献类型：
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作者：
Liang Zhu;Nabeel Alsaab;M. Cheng;Pai-Yen Chen
谐波应答器传感器接收射频(RF)信号并将其转换为调制的二次谐波，已被证明在强杂波环境中用于信号询问是有效的。在这里，我们提出了一种紧凑型双谐振微带天线，它由一个加载了短路针脚的椭圆形贴片组成。这种天线利用TME110谐振模式截获垂直极化的基音(2.86 GHz)，并利用TMo110谐振模式重发平行极化的二次谐波(5.72 GHz)。此外，我们还开发了一种基于谐波的无线液体传感器，该传感器由所提出的天线和微机械液体通道组成。我们的测量结果表明，即使在噪声环境中，二次谐波强度也可以准确地表示填充在微流控槽中的液体(例如，不同浓度的丙酮-水混合物)的介电性质。然而，没有频率和偏振调制的类似设置(即，线性和无源后向散射标签)不能提供对液体性质的灵敏和定量测量。所提出的具有传感能力的低剖面双谐振天线将为谐波传感器和非线性射频识别(RFID)标签的发展铺平道路。
Harmonic transponder sensors, receiving radio-frequency (RF) signal and converting it to a modulated second harmonic, have been demonstrated to be effective for signal interrogation in environments with strong clutters. Here, we propose a compact dual-resonance microstrip antenna consisting of an elliptical patch loaded with shorting pins. Such an antenna utilizes the TMe110 resonant mode to intercept the perpendicularly-polarized fundamental tone (2.86 GHz) and uses the TMo110 resonant mode to retransmits the parallelly-polarized second harmonic (5.72 GHz). Moreover, we have developed a harmonic-based wireless liquid sensor comprising the proposed antenna and a micromachined liquid channel. Our measurement results show that even in the noisy environment, the second harmonic strength can precisely indicate the dielectric property of liquid filled in the microfluidic tank (e.g., acetone-water mixtures with various concentrations). However, a similar setup without frequency and polarization modulations (i.e., linear and passive backscatter tag) fails to provide a sensitive and quantitative measurement of liquid property. The proposed low-profile dual-resonance antenna with sensing capability will pave the way for the development of harmonic sensors and nonlinear radio-frequency identification (RFID) tags.