In this article, we discuss how one can make, with modern and low-cost tools, a software-defined ultra high-frequency (UHF) RF identification (RFID) reader. Since we have chosen to leave the discussion of the top-level reader implementation until the very end, an introductory outline is warranted to help guide our audience. We first provide the uninitiated with some background context by answering four questions: What is UHF RFID? How does it work? What happened with UHF RFID? And, finally, what's next? That is, how do we envision the technology evolving in the future with the support of a broad community? Second, we describe the fundamental metrics and performance budgeting of RFID readers. Following this, we provide an overview on how to design, make, and automatically tune two critical components of UHF RFID readers: the antenna and transmit leakage canceller. Third, we delve even further into details of the transmit leakage canceller. Finally, we describe the complete high-level architecture of a proposed low-cost reader.

中文翻译：

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制作低成本软件定义的 UHF RFID 读取器


在本文中，我们讨论如何使用现代化的低成本工具制造软件定义的超高频 (UHF) 射频识别 (RFID) 读取器。由于我们选择将顶级阅读器实现的讨论留到最后，因此有必要提供一个介绍性大纲来帮助指导我们的观众。我们首先回答四个问题，为外行提供一些背景知识：什么是 UHF RFID？它是如何运作的？ UHF RFID 发生了什么？最后，下一步是什么？也就是说，我们如何设想未来技术在广泛社区的支持下不断发展？其次，我们描述了 RFID 阅读器的基本指标和性能预算。接下来，我们概述了如何设计、制造和自动调整 UHF RFID 读取器的两个关键组件：天线和传输泄漏消除器。第三，我们进一步深入研究传输泄漏消除器的细节。最后，我们描述了所提出的低成本阅读器的完整高级架构。