1. UKM Learning and Research Repository
2. Master Thesis / Tesis Master
3. Institute of Climate Change / Institut Perubahan Iklim

Title:	Design of meandered line tag antennas for UHF RFID applications
Authors:	Md. Rokunuzzaman (P67290)
Supervisor:	Mohammad Tariqul Islam, Professor Dr.
Keywords:	Radio Frequency Identification (RFID) Antennas Ultra-High Frequency (UHF) Dissertations, Academic -- Malaysia
Issue Date:	28-Jan-2015
Description:	Radio Frequency Identification (RFID) technology has gained a considerable amount of attention because of the vast variety and growing number of applications RFID technology supports. This is specifically prevalent for ultra-high frequency (UHF) RFID systems that have reached beyond the tracking and management of supply chain due to its agility, speed and endurance. RFID tag system compared to barcode has advantages of non-line of sight rapid identification, reprogram ability as well as highly intelligent and flexible. The low frequency antennas have advantages of low power consumption and cost effectiveness, however, short read range, bulky structure and low data rate are the drawbacks. High frequency antennas are efficient in data transfer rate with long read range; however the increment in cost is the drawback. Hence, UHF frequency has become an optimum choice for RFID applications. Among the two types of tag antenna, active tag antennas require external power source, making the design complex and costly whereas passive tag antennas use the power transmitted by the reader antenna resulting in cost effective and compact design. For UHF frequency applications, microstrip gives less complex structure with optimum and application oriented performance. However, conventional microstrip tag antennas inherently lack in terms of read range, region specific bandwidths, radiation patterns, gains and substrate flexibility in UHF RFID band. This thesis presents two designs of UHF RFID passive tag antennas. The first design focuses on the meandered line dipole antenna for global UHF RFID band where a square loop feeding technique is used to achieve a wide bandwidth. In the second design, a semicircle loop attached with two impedance matching feeding strips is implemented for long range detection at Malaysian UHF RFID band. The antenna performances were studied using finite element method based electromagnetic simulator Ansoft HFSS (High Frequency Structural Simulator) version 15.0 and fabricated prototypes of the designed antennas were followed by numerous parametric measurements. A good impedance matching has been achieved at the UHF RFID frequency using NXP provided UHF RFID tag chip. The antenna exhibit vertical circular polarization with a gain of 1.75 dBi in the UHF RFID frequency. A highest read range of 12.3 meters is achieved using a horn antenna transceiver. The experimental results matched quite well to the simulated results and demonstrate that the proposed antennas are fully capable to satisfy the bandwidth and gain with stable read range for various applications.,Master
Pages:	99
Call Number:	TK7871.6 .M845 2015
Publisher:	UKM, Bangi
Appears in Collections:	Institute of Climate Change / Institut Perubahan Iklim

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