UWB/UHF RFID tag

This paper presents a two-port antenna for a passive RFID tag including separate receiving and transmitting ports for direct connection to a hybrid UHF/UWB RFID transponder chip. The receiving port feed is linearly polarized and narrowband for energy harvesting (from a conventional RFID reader), whereas the transmitting port feeds ultrawideband (UWB) slot radiation. Measurements results show that, the slot resonates over the full FCC UWB band (3.1-10.6 GHz), while the narrowband port resonates at the UHF RFID bands.