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This paper presents a two-port antenna including a receiving port and a transmitting one in the same volume. These two antennas are physically integrated and electrically isolated. The receiving antenna is a linearly polarized narrowband slot for energy harvesting, whereas the transmitting one is a circularly- polarized ultrawideband (UWB) quasi-spiral for signal radiation. The measurement results show that, the slot resonates at 5.8GHz, and the quasi-spiral has a 10-dB return loss bandwidth of 2.85{5.16GHz and a 3-dB axial-ratio bandwidth of 3.05{4.43GHz. The electrical isolation between these two antennas is more than 20 dB covering 1{8GHz. This two-port antenna is a good candidate for wireless powered UWB-RFID tags.

A TWO-PORT ANTENNA FOR WIRELESS-POWERED UWB-RFID TAGS