RF tag front-end design for uncompromised communication and harvesting

J. Kimionis, M. Tentzeris
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引用次数: 15

Abstract

Typically, low-cost and low-power backscatter radio communicators utilize a switching mechanism for alternating the antenna load between two values. In this way, they achieve modulation by reflection of the RF waves induced at the communicator's antenna. For tags that employ a rectifier for wireless energy harvesting, a single transistor may switch between the matched harvester and a reflective load (an open or short). However, optimized backscatter communication occurs when switching between two reflective loads, ideally an open and a short. This prohibits the use of a harvester that requires a good matching (i.e. no reflections) and produces a tradeoff of either compromising communication performance or not employing a harvester. Although this may not pose a problem for commodity RFID tags that operate in short ranges and do not require high computational ability, it is a strong limitation for applications like wireless sensor networks that employ backscatter radio as a low-cost and low-power communication scheme. In this work, an RF front-end is designed, analyzed, and implemented, that overcomes the limitation of compromising communication performance when employing a harvester.
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射频标签前端设计,实现不妥协的通信和收获
通常,低成本和低功耗的反向散射无线电通信器利用切换机制在两个值之间交替天线负载。通过这种方式,它们通过在通信器天线处引起的射频波的反射来实现调制。对于使用整流器进行无线能量收集的标签,单个晶体管可以在匹配的收集器和反射负载(开或短)之间切换。然而,优化后向散射通信发生在两个反射负载之间切换时,理想情况下是一个开放负载和一个短负载。这禁止使用需要良好匹配(即无反射)的收割机,并产生折衷,要么损害通信性能,要么不使用收割机。虽然这对于短距离运行且不需要高计算能力的商用RFID标签可能不会构成问题,但对于使用反向散射无线电作为低成本和低功耗通信方案的无线传感器网络等应用来说,这是一个很大的限制。在这项工作中,设计,分析和实现了射频前端,克服了使用收割机时影响通信性能的限制。
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