This work presents a paper-based innovative tag architecture, thought for next generation passive RFID, where simultaneous communication and radio-frequency energy collection capabilities exploit the UWB and the UHF bands, respectively. These functionalities are achieved through a compact single-port dual-band antenna and a feeding/matching network able to highly decouple the two operating paths. The electromagnetic design and the promising performance of the entire tag in the dual-mode of operation are deeply described.