In a frequency-domain chipless RFID system, the backscattered signal from a tag is directly obtained in the frequency domain over limited bandwidth. However, to reduce the parasitic reflections, it is crucial to obtain the backscattered signal in the time domain. This letter proposes a precise quasi-analytic method, known as the model-based vector fitting (VF) technique, to provide the closed-form equation of the backscattered response in the time domain. The proposed method successfully recovers a tag’s identification (ID) among parasitic reflections using a single tag measurement without requiring prior knowledge about the tag.

中文翻译：

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基于模型的 VF 技术用于减少频域无芯片 RFID 系统的寄生反射

在频域无芯片 RFID 系统中，来自标签的反向散射信号是在有限带宽的频域中直接获得的。然而，为了减少寄生反射，在时域中获得反向散射信号是至关重要的。这封信提出了一种精确的准解析方法，称为基于模型的矢量拟合 (VF) 技术，以提供时域中反向散射响应的封闭形式方程。所提出的方法使用单个标签测量成功地在寄生反射中恢复了标签的标识 (ID)，而不需要有关标签的先验知识。