RFID technology

Ahmed, Ahmad

Abstract

Radio frequency identification (RFID) is the most attractive technology that enables companies to better track assets tools and inventory. RFID technology can also be used in different applications such as air port baggage and express parcel logistics across every industry. RFID technology is seen by some scientists as the inevitable replacement for bar codes. Since it offers different advantages over bar codes as it is ability to two ways of communications, non-optical proximity communication, and the higher information capacity. RFID system mainly consists of interrogator (reader) and transponder (tag) and it is allocated in different bands of frequencies (Lower, high, ultra high and microwave bands). There are three types of RFID systems which are divided according to these bands of frequencies. RFID systems which are working in (LF and HF) band called active RFID systems, while in UHF bands are known passive UHF RFID systems and in microwave bands called semi-passive RFID systems. Passive UHF RFID system is the most popular system in RFID systems. This is due to the long read range, Lowe cost and the small size that they offer. However, this system is facing different challenges that effect it is performance. One of these critical challenges is it is difficult for UHF RFIDtags to be placed on metallic surfaces. Since metallic surfaces affect the tag antenna parameters such as the impedance matching, the radiation efficiency and the radiation pattern. This led researches to carry out some studies to find out solution for this problem.This thesis discussed the passive UHF RFID system and its propagation range as well as studied the performance of UHF RFID tags when they are placed in close proximity to metallic objects and liquids. This study involves measuring the read range of the tag when the tag is placed in different distances from metallic surface, and studies the effect of liquids on the performance of the tag as well. Experiments were carried out to achieve this study. Three types of metal with different sizes were tested and the performance was evaluated. The results have shown that distance less0.025λ the performance of the UHF tag will be significantly affected. Whereas, distances of 0.05λto 0.25λ from the metallic surface could make the UHF RFID tag performance be acceptable. Moreover, the results of examining the effects of liquids on the read range of the tag have shown that liquidshave remarkable affect on the read range.

Citation

Ahmed, A. (2010). RFID technology. (Thesis). University of Hull. Retrieved from https://hull-repository.worktribe.com/output/4209561

• Thesis Type: Thesis
• Deposit Date: Sep 28, 2011
• Publicly Available Date: Feb 22, 2023
• Keywords: Engineering
• Public URL: https://hull-repository.worktribe.com/output/4209561
• Additional Information: Department of Engineering, University of Hull
• Award Date: Sep 1, 2010