A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna
A Compact, Passive Frequency-Hopping Harmonic Sensor Based on a Microfluidic Reconfigurable Dual-Band Antenna
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DOI：
10.1109/jsen.2020.3000778
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发表时间：
2020-11
影响因子：
4.3
通讯作者：
Liang Zhu;M. Farhat;Yi-Chao Chen;K. Salama;Pai-Yen Chen
中科院分区：
文献类型：
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作者：
Liang Zhu;M. Farhat;Yi-Chao Chen;K. Salama;Pai-Yen Chen
我们在这里提出了一个全无源无线液体传感器，使用谐波转发器，它包括一个双波段微带天线重新配置的不同类型的液体注入流体腔。与传统的射频（RF）反向散射传感器不同，谐波传感器接收跳频的RF单调波，反向散射其二次谐波，峰值频率随液体混合物的介电特性而移动。该微带天线采用混合馈电结构，其外开口环贴片在基频（${f}{0}$）处呈现窄带TM 310模，内椭圆贴片呈现以二次谐波频率（$2{f}{0}$）为中心的TM ${e110}$和TM ${o 110}$混合的宽带谐振。特别地，外部开口环贴片加载有流体通道系统以调谐TM $_{3}10$模式（${f}_{0}$）的谐振频率。我们证明了填充在流体腔中的液体混合物的类型可以通过阅读二次谐波频谱中的峰值接收信号强度指示符（RSSI）来清楚地感知。我们的研究结果表明，部署这种无源无线传感器在嘈杂的环境中，包括杂波，多次反射，干扰和串扰的潜力。
We propose here a fully-passive wireless liquid sensor using a harmonic transponder, which comprises a dual-band microstrip antenna reconfigured by different types of liquids injected in a fluidic cavity. Different from traditional radio-frequency (RF) backscatter sensors, the proposed harmonic-transponder sensor (or harmonic sensor) receives frequency-hopped RF monotones and backscatters their second harmonics, with the peak frequency shifted by dielectric properties of liquid mixtures. This microstrip antenna has a hybrid-feed structure, of which an outer split-ring patch exhibits a narrow-band TM310 mode at the fundamental frequency ( ${f}_{0}$ ) and an inner elliptical patch displays a wideband resonance centered at the second-harmonic frequency ( $2{f}_{0}$ ), achieved with hybridization of TM $_{e110}$ and TM $_{o110}$ modes. In particular, the outer split-ring patch is loaded with a fluidic channel system to tune the resonance frequency of the TM $_{3}10$ mode ( ${f}_{0}$ ). We demonstrate that the type of liquid mixture filling in the fluidic cavity can be clearly perceived by reading the peak received signal strength indicator (RSSI) in the spectrum of second harmonics. Our results show the potential for deploying this passive wireless sensor in noisy environments that include clutters, multiple reflections, jamming, and crosstalks.