In order to encrypt/encode data based on the magnitude level of the radar cross-section (RCS), we propose an approach with a precise estimation considering the resonant characteristics of a multipatch backscatter-based chipless radio frequency identification (RFID) dedicated for chipless tags depolarization. The working principle is based on the polarization mismatch between the tag and the reader antenna to control the magnitude of the backscatter, which allows a reliable detection in real environments. We introduce in this paper a new 4-bit chipless RFID tag with an enhanced RCS, based on a triangular patch antenna with multiple resonators. Additionally, we propose an ultra-wideband impulse radar (UWB-IR)-based reader that interrogates the chipless tag with a UWB pulse, and the received backscatter was studied in both time- and frequency-domains. The antenna was operating from 4.7 to 6.1 GHz, a band allocated for RFID systems. The obtained experimental measurement results in the environment of anechoic chamber were exceptionally relevant to validate the simulation results.

中文翻译：

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使用基于 UWB IR 的阅读器研究具有 UWB 脉冲的无芯片 RFID 标签

为了基于雷达截面 (RCS) 的幅度级别对数据进行加密/编码，我们提出了一种精确估计的方法，该方法考虑了专用于无芯片的基于多面体反向散射的无芯片射频识别 (RFID) 的谐振特性标签去极化。工作原理是根据标签和阅读器天线之间的极化失配来控制反向散射的大小，从而在真实环境中进行可靠的检测。我们在本文中介绍了一种新的 4 位无芯片 RFID 标签，具有增强的 RCS，基于具有多个谐振器的三角形贴片天线。此外，我们提出了一种基于超宽带脉冲雷达 (UWB-IR) 的阅读器，该阅读器使用 UWB 脉冲询问无芯片标签，并在时域和频域中研究了接收到的反向散射。天线的工作频率为 4.7 至 6.1 GHz，这是分配给 RFID 系统的频段。在消声室环境中获得的实验测量结果对验证模拟结果具有非常重要的意义。