A Passive Harmonic Tag for Humidity Sensing
A Passive Harmonic Tag for Humidity Sensing
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DOI：
10.1155/2014/670345
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发表时间：
2014-01-01
影响因子：
1.5
通讯作者：
Girbau, David
中科院分区：
文献类型：
--
作者：
Lazaro, Antonio;Villarino, Ramon;Girbau, David
本文介绍了一种用于射频识别（RFID）和无线传感器应用的无源谐波标签。标签使用双极化UHF贴片天线作为输入天线。其中一个输出端连接到一个倍频器，该倍频器由一个肖特基二极管组成，其输出端连接到一个以两倍输入频率调谐的贴片。输入天线的另一个输出馈送DC功率收集转换器，该DC功率收集转换器驱动振荡器，该振荡器通过控制肖特基二极管的偏置点来调制其输出信号。天线的输出也用作湿度传感器。为了实现这一点，天线加载了一个叉指电容与湿度相关的电容。因此，当湿度变化时，天线失谐，因此接收到二次谐波功率。标签使用标准玻璃纤维基材制造。谐波标签操作的基本理论进行了描述，并与标准的后向散射方法进行了比较。使用商业组件的概念证明的实验结果。
This paper describes a passive harmonic tag for radio frequency identification (RFID) and wireless sensor applications. The tag uses a dual polarized UHF patch antenna as an input antenna. One of the outputs is connected to a frequency doubler, which consists of a Schottky diode with its output connected to a patch tuned at twice the input frequency. The other output of the input antenna feeds a DC power harvested converter that drives an oscillator which modulates its output signal by controlling the bias point of the Schottky diode. The antenna's output is also used as a humidity sensor. To achieve this, the antenna is loaded with an interdigital capacitor with humidity-dependent capacitance. The antenna is consequently detuned when humidity varies, and therefore the second harmonic power is received. The tag is manufactured using standard fiberglass substrate. The basic theory of harmonic tag operation is described and compared with the standard backscattering approach. Experimental results with a proof of concept using commercial components are presented.