Digital Electronics as RFID Tags: Impedance Estimation and Propagation Characterization at 26.5 GHz and 300 GHz
Digital Electronics as RFID Tags: Impedance Estimation and Propagation Characterization at 26.5 GHz and 300 GHz
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DOI：
10.1109/jrfid.2020.3015798
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发表时间：
2021-03
影响因子：
3.1
通讯作者：
Chia-Lin Cheng;S. Sangodoyin;Luong N. Nguyen;Milos Prvulović;A. Zajić
中科院分区：
文献类型：
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作者：
Chia-Lin Cheng;S. Sangodoyin;Luong N. Nguyen;Milos Prvulović;A. Zajić
本文介绍了基于数字电子器件的新型 RFID 标签的电路阻抗模型以及 26.5 GHz 和 300 GHz 下的传播特性结果。该 RFID 标签利用数字电路内部晶体管开关产生的反向散射无线电，不需要天线或射频前端电路，从而进一步缩小了设备的外形尺寸。此外，所提出的 RFID 标签与各种询问频率兼容，并且可以在现有电子设备上实现，无需额外成本。所提出的电路阻抗模型解释了这种新型反向散射无线电的调制机制，并使用 SPICE 模型参数提供了数字电路阻抗的估计。基于所提出的电路阻抗模型，我们开发了一种修改后的调制损耗因数来估计数字电子设备开关活动产生的调制损耗。此外，在 26.5 GHz 和 300 GHz 下进行了传播表征，其中载波功率和反向散射功率的遮蔽增益在 26.5 GHz 下分别为 3.93 dB 和 0.96 dB，在 300 GHz 下分别为 1.01 dB 和 0.52 dB，这表明与载体通道。
This article presents a circuit impedance model and results of propagation characterization at 26.5 GHz and 300 GHz for a new type of RFID tag that is based on digital electronics. This RFID tag leverages the backscatter radio generated from switching of transistors inside digital circuits, which does not need antennas or RF front-end circuits thereby further reducing the device’s form factor. Moreover, the proposed RFID tag is compatible with a wide range of interrogating frequencies and can be implemented on existing electronics without additional cost. The proposed circuit impedance model explains the modulation mechanism of this new backscatter radio and provides an estimation of digital circuits’ impedance using SPICE model parameters. Based on the proposed circuit impedance model, we develop a modified modulation loss factor to estimate the modulation loss resulting from the switching activity of the digital electronics. Furthermore, propagation characterization is conducted at 26.5 GHz and 300 GHz, where the shadowing gain for the carrier power and the backscattered power is characterized as 3.93 dB and 0.96 dB at 26.5 GHz, and 1.01 dB and 0.52 dB at 300 GHz, respectively, showing that the backscatter channel can provide a more reliable link that is resistant to the constructive and destructive interference from the multipaths as compared to the carrier channel.