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16 pages, 2358 KiB

Open AccessArticle

RF-Access: Barrier-Free Access Control Systems with UHF RFID

by Xuan Wang, Xia Wang, Yingli Yan, Jia Liu and Zhihong Zhao

Appl. Sci. 2022, 12(22), 11592; https://doi.org/10.3390/app122211592 - 15 Nov 2022

Cited by 3 | Viewed by 5247

Traditional RFID-based access control systems use flap barriers to help manage pedestrian access and block unauthorized staff at any entrance, which requires visitors to swipe their cards individually and wait for the opening of the blocking body, resulting in low-frequency pedestrian access and even congestion in places with large passenger flow. This paper proposes a barrier-free access control system (RF-Access) with UHF RFID technology. The main advantage of RF-Access is that it provides non-intrusive access control by removing flap barriers and operations of swiping the card. The visitors just go across the system without any stay at the entrance. Meanwhile RF-Access performs the authentication, which greatly improves time efficiency and quality of service. RF-Access addresses two key issues of the non-intrusive access control: motion direction detection and illegal intrusion detection. In RF-Access, we first propose a dual-antenna system setup together with a time-slot-based model to monitor users’ moving directions, which is robust to different environmental factors, such as multi-path effects. Afterwards, we use a tag array to detect illegal intrusion in case attackers do not carry any RFID tags. We implement a prototype of RF-Access with commercial RFID devices. Extensive experiments show that our system can detect the moving direction with 99.83% accuracy and detect illegal intrusion with an accuracy of 96.67%. Full article

(This article belongs to the Special Issue RFID(Radio Frequency Identification) Localization and Application)

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16 pages, 6190 KiB

Open AccessCommunication

UHF RFID Conductive Fabric Tag Design Optimization

by Franck Kimetya Byondi and Youchung Chung

Sensors 2021, 21(16), 5380; https://doi.org/10.3390/s21165380 - 10 Aug 2021

Cited by 7 | Viewed by 3335

Abstract

This paper presents the design of a 920 MHz Ultra High Frequency (UHF) band radio frequency identification (RFID) conductive fabric tag antenna. The DC (Direct Current) resistance and impedance of the conductive fabric are measured by a DC multimeter and by a network analyzer at a UHF frequency band. The conductivities of the fabrics are calculated with their measured DC resistance and impedance values, respectively. The conductivities of the fabric are inserted into the CST simulation program to simulate the fabric tag antenna designs, and the results of the tag designs with two conductivities are compared. Two fabric UHF RFID tag antennas with a T-Matching structure, one with the name-tag size of 80 × 40 mm, and another with 40 × 23 are simulated and measured the characteristics of tag antennas. The simulated and measured results are compared by reflection coefficient S11, radar cross-section and reading range. The reading range of the 80 × 40 mm fabric tag antenna is about 4 m and 0.5 m for the 40 × 23 size tag. These fabric tags can be easily applied to an entrance control system as they can be attached to other fabrics and clothes. Full article

(This article belongs to the Special Issue RF Sensors: Design, Optimization and Applications)

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