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该论文提出了一种三频段无源RFID标签，能同时工作在13.56MHz HF和860-960MHz UHF频段，解决了传统单频段标签在不同应用场景下的局限性。通过设计宽带模拟接口，实现了在HF近场和UHF远场条件下的稳定通信和能量采集。
Graz University of Technology, Graz, Austria, 2Infineon, Graz, Austria To profit from the application-benefits of both 13.56MHz HF RFID systems typically used in identification and 860 to 960MHz UHF RFID systems used in supply chain applications, two frequency selective tags or one broadband chip with one antenna are necessary. Because of the big frequency step between HF and UHF modes, the tag will operate once in a close-coupled magnetic field, at a minimum field strength of 50mA/m, and in UHF typically in far-field, down to 57µW (-12.5dBm). This paper presents a broadband analog interface in 0.12μm CMOS without a Schottky Diode process-option, which powers the chip from 1MHz to 2.45GHz and communicates with EPC UHF and HF. Figure 15.2.1 shows the block architecture of the analog interface. Ant_pad_1 and Ant_pad_2 are interface pads of a HF and UHF frequency selective off-chip antenna and the balanced full-wave
Albert Missoni1, Christian Klapf1, Wolfgang Pribyl1, Hofer Guenter2, Gerald Holweg2