A Novel Dual-Antenna Structure for UHF RFID tags
Date Issued
2010
Date
2010
Author(s)
Yuan, De-Seng
Abstract
In this dissertation, we design a novel tag structure for RFID system. The conventional tag has single antenna, which is used for both receiving and backscattering. Input impedance of the conventional tag antenna is designed to match tag IC for receiving and switched between match and short state for backscattering. The maximum backscattering level difference cannot be obtained and also no power be supplied to the tag IC during the short state. The novel tag structure includes two cross-polarized antennas. The receiving antenna is received that is designed to match the tag IC for maximum power transfer. The backscattering antenna is alternatively connected to two optimized impedance states for maximum backscattering level difference. It is expected that the reading range can be much increased.
According to literatures, we know that designed antenna doesn’t have the best isolation, and therefore we improve it. Furthermore, the improved antenna can be easily printed with general PCB to reduce complexity of antenna fabrication, and increased read efficiency of RFID system at the same time.
In addition, we know that antenna performances achieved request on antenna input impedance, -6dB bandwidth, isolation and pattern by simulations and measurement. Level difference of the novel tag structure is excellent than the conventional tag. We don’t doubt superiority of the novel tag structure over the conventional one.
Subjects
Radio Frequency Identification (RFID)
impedance loading
cross-polarized
backscattering
isolation
Type
thesis
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