Summary
International Symposium on Antennas and Propagation
2009
Session Number:3B2
Session:
Number:3B2-3
Wideband UHF RFID Tag
Pornanong Pongpaibool,
pp.855-858
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
The Radio Frequency Identification (RFID) technology, especially in ultra-high frequency (UHF) band, is widely used in many applications such as supply chain, logistics, and healthcare [1]. In the UHF RFID system, the information in the transponder (tag) is transferred to the interrogator (reader) using radiative coupling mechanism [2]. This mechanism provides longer communication distance between tag and reader comparing to the inductive coupling mechanism used in low frequency (LF) or high frequency (HF) RFID system. The communication distance of the UHF RFID system strongly depends on the frequency of use. However, the UHF RFID band allocation is different worldwide. For example, the UHF RFID band of USA is 902-928 MHz, that of European countries is 865-868 MHz, that of Japan is 952-954 MHz, and that of Thailand is 920-925 MHz. The UHF RFID band of all countries ranges within 860-960 MHz. In the applications such as supply chain, the RFID tag is attached to the products that are transferred worldwide. In such a case, the RFID tag should have high communication distance in the UHF RFID bands of all countries worldwide. Various antenna designs have been proposed for improving the communication distance or read range [3], [4] but the bandwidth cannot cover the worldwide UHF RFID band. In order to increase the bandwidth, wideband UHF RFID tags for metal mount have been proposed [5]-[7]. In this paper, we proposed the wideband UHF RFID tag antenna for using worldwide. The bandwidth of this tag antenna can cover UHF RFID band with high read range within the band. The antenna parameters are varied to determine how we can adjust the antenna in case the different IC chip is used or different frequency of the highest read range is needed. Finally, we optimize the proposed tag antenna to achieve the high read range within the UHF RFID band of Thailand, together with the band of European countries and USA.