Modified Planar Square-Loop Antenna for Electronic Article Surveillance Radio Frequency Identification Applications
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NTENNA AND FEEDER SYSTEMS
Modified Planar Square-Loop Antenna for Electronic Article Surveillance Radio Frequency Identification Applications M. N. Zahida, *, J. Jianga, **, U. Rafiqueb, and D. Erica aSchool
of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081 China Department of Electrical Engineering, Capital University of Science and Technology, Islamabad, Pakistan *e-mail: [email protected] **e-mail: [email protected]
b
Received May 3, 2020; revised May 3, 2020; accepted May 21, 2020
Abstract—In this paper, a modified design of a planar square-loop antenna is presented for Electronic Article Surveillance (8.2 MHz) Radio Frequency Identification applications. The main purpose of the proposed design is to enhance the transmission efficiency of a loop antenna without disturbing other performance parameters. For that purpose, the spacing between the loop turns is adjusted in such a way that the coupling between similar loop antennas can be enhanced. Therefore, from measured results, it is observed that the proposed antenna provides a transmission efficiency of 63.92% at a center frequency of 8.198 MHz, and it also provides a –10 dB impedance bandwidth of 6 kHz. Keywords: square-loop antenna, electronic article surveillance, RFID, transmission efficiency DOI: 10.1134/S1064226920100071
1. INTRODUCTION In the 1940s and 1950s, Radio Frequency Identification (RFID) technology was introduced for the identification of items using radio-waves. Now-adays, RFID technology has gained significant interests due to the exceptional advantages such as automated communication, remote reading, and high data rate capability [1, 2]. A typical RFID system consists of three components: tags, a reader, and the main server. The tags transmit data to the reader’s antenna, while the reader collects data from different tags and send them to the server for further processing. The main purpose of the server is to monitor and identify the data transferring between the tag and the reader. The RFID tag usually consists of a microchip and an antenna, and a tag antenna is considered to be one of the major components in RFID systems [3]. The RFID system usually categorized as Low-Frequency (LF), High-Frequency (HF), and Ultra-High-Frequency (UHF) systems [4]. The RFID tags operating in LF and HF bands are not easily get affected by the harsh environments and thus, offered robust and reliable readability. Recently, an unlicensed band of 8.2 MHz is allocated for Electronic Article Surveillance (EAS) RFID applications. It is an anti-theft technology, which is used for the protection against shoplifters [5]. For the said purpose, small tags are utilized by high value mer-
chandise when shoplifters interested take products through the electronic walk-through gate at exit doors. The shoplifters, who are not familiar with these systems, will either refrain from stealing or will get caught. The EAS systems can also be used for inventory control, and to track articles when they pass through a particular system [5]. Like o
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