Extending the reading region of the RFID UHF Gen2 system by HF/UHF integration

In this paper we present an architecture of the RFID UHF Gen2 tag which enables an increased reading range based on the integration of the HF harvester with the UHF Gen2 tag. HF harvester charges the circuitry of the UHF tag in a similar way as it works with a battery assisted scheme. In regard to a standard battery-assisted tag, the proposed solution is preferred since: i) the proposed tag, although performs like a battery equipped tag, is still a true passive system, ii) the problem of a limited life period of the battery is overcame, and iii) by simple charging control it is possible to synchronize reader to recognize true tag(s) position at a resolution defined by a dimension of the HF transmitter antenna(s). We present an experimental architecture of the integrated HF/UHF system and the measured results on the typical lab set up to show a benefit in the reading range of the RFID UHF Gen2 tag.