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首页> 外文期刊>International Journal of Adaptive Control and Signal Processing >Adaptive impedance matching system for downlink of passive semi-ultra wideband ultra-high frequency radio frequency identification tag
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Adaptive impedance matching system for downlink of passive semi-ultra wideband ultra-high frequency radio frequency identification tag

机译：无源半超宽带超高频射频识别标签下行自适应阻抗匹配系统

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摘要

The input impedance of ultra-high frequency radio frequency identification tag varies with the received power on the chip. It will induce impedance mismatch between the receiver antenna and microchip, thus drastically affect the performance of communication. In this paper, a low cost and fully integrated automatic impedance matching system was presented to solve this problem. It consists of two control loops for indepen dent control of the real and imaginary parts of impedance. The first control loop realizes resistance correction using a parallel LC tuning network, whereas the second control loop achieves reactance compensation using a series LC tuning network. In both loops, the mismatch information is detected for direct control of the variable elements, varactors, which are tuned in a sequential manner. For unambiguous control of the resis tance correction, the sign of the intermediate reactance is used as a secondary control criterion to enforce operation into a stable region. The functionality of the proposed automatic matching system was verified for different input impedances of a specifically semi-ultra wideband ultra-high frequency radio frequency identification tag as the available input power varies. The results indicate that all matched impedances are clustered around the target impedance 50 + j 0 Ω after acquisition of both loops.
机译：超高频射频识别标签的输入阻抗随芯片上的接收功率而变化。它将导致接收器天线与微芯片之间的阻抗失配，从而严重影响通信性能。本文提出了一种低成本且完全集成的自动阻抗匹配系统来解决该问题。它由两个控制回路组成，用于分别控制阻抗的实部和虚部。第一个控制回路使用并联LC调谐网络实现电阻校正，而第二个控制回路使用串联LC调谐网络实现电抗补偿。在两个循环中，都检测到不匹配信息，以直接控制以顺序方式调整的可变元件变容二极管。为了明确地控制电阻校正，将中间电抗的符号用作辅助控制标准，以将操作强制到稳定区域。随着可用输入功率的变化，针对特定的半超宽带超高频射频识别标签的不同输入阻抗，对提出的自动匹配系统的功能进行了验证。结果表明，在获取两个环路之后，所有匹配的阻抗都聚集在目标阻抗50 + j 0Ω附近。

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