scholarly journals Illustration of the Impedance Behaviour of Extremely Low-Profile Coupled Shorted-Patches Antennas for UHF RFID of People

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Milan Svanda ◽  
Milan Polivka
Keyword(s):  
Frequency Band ◽  
Input Impedance ◽  
Uhf Rfid ◽  
Rfid Tag ◽  
Low Profile ◽  
Radiofrequency Identification ◽  
Feeding Methods ◽  
Parametric Studies ◽  
Antenna Input

The recently introduced coupled shorted-patches technique for the design of extremely low-profile UHF RFID tag antennas is used to illustrate the flexibility of selected feeding methods for tuning the antenna input impedance for the complex values required for matching with typical RFID chips. We present parametric studies of the impedance behaviour of dipole-excited and directly excited antennas designed for radiofrequency identification of people in the European UHF frequency band. Our study can significantly facilitate the design of this class of on-body tag antennas.

A single-sided meandered-dual-antenna structure for UHF RFID tags

2017 ◽  
Vol 9 (7) ◽  
pp. 1419-1426 ◽  
Author(s):  
Pouria Kamalvand ◽  
Gaurav Kumar Pandey ◽  
Manoj Kumar Meshram
Keyword(s):  
Input Impedance ◽  
Short Circuit ◽  
Complex Conjugate ◽  
Uhf Rfid ◽  
Antenna Structure ◽  
Sufficient Energy ◽  
Receiving Antenna ◽  
Radiofrequency Identification ◽  
The One ◽  
Read Range

A meandered-dual-antenna structure is proposed for UHF radiofrequency identification (RFID) tag. It is composed of two independent antennas printed on the one side of the substrate board. One of the antennas is exclusively used for receiving and harvesting sufficient energy to the tag chip having the complex conjugate impedance of the receiving antenna. The other is for backscatter to enhance maximum differential radar cross-section with purely real input impedance, to enhancement the read range. The receiving antenna is formed by a rectangular loop and a parasitic meandered line. The rectangular loop is used as a feeding element for the meandered line. The backscattering antenna is made using a meandered dipole along with a thin rectangular strip. The input impedance of the receiving antenna is designed to be conjugate matched to the chip impedance (13.5-j110 Ω), whereas the input impedance of backscattering antenna alternatively switched to open and short circuit for modulating the backscattered field. The input impedance of receiving and backscattering antennas is measured using differential probe technique. The simulated and measured results are found in good agreement. It is also demonstrated that the read range of UHF RFID system increased considerably by using the dual-antenna structure.

Low-Profile Conformal UHF RFID Tag Antenna for Integration With Water Bottles

2011 ◽  
Vol 10 ◽  
pp. 1147-1150 ◽  
Author(s):  
T. Bjorninen ◽  
A. Z. Elsherbeni ◽  
L. Ukkonen
Keyword(s):  
Uhf Rfid ◽  
Rfid Tag ◽  
Low Profile

scholarly journals Low-profile folded dipole UHF RFID tag antenna with outer strip lines for metal mounting application

2020 ◽  
Vol 28 (5) ◽  
pp. 2643-2656
Author(s):  
Fuad ERMAN ◽  
Effariza HANAFI ◽  
Eng-Hock LIM ◽  
Wan Amirul WAN MOHD MAHYIDDIN ◽  
Sulaiman Wadi HARUN ◽  
...  
Keyword(s):  
Uhf Rfid ◽  
Rfid Tag ◽  
Low Profile ◽  
Strip Lines ◽  
Folded Dipole ◽  
Outer Strip

scholarly journals A Compact and Flexible UHF RFID Tag Antenna for Massive IoT Devices in 5G System

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5713
Author(s):  
Muhammad Hussain ◽  
Yasar Amin ◽  
Kyung-Geun Lee
Keyword(s):  
Radio Frequency Identification ◽  
Cost Effective ◽  
Future Internet ◽  
Uhf Rfid ◽  
Rfid Tag ◽  
Low Profile ◽  
5G Systems ◽  
Iot Devices ◽  
Passive Rfid ◽  
Read Range

Upcoming 5th-generation (5G) systems incorporate physical objects (referred to as things), which sense the presence of components such as gears, gadgets, and sensors. They may transmit many kinds of states in the smart city context, such as new deals at malls, safe distances on roads, patient heart rhythms (especially in hospitals), and logistic control at aerodromes and seaports around the world. These serve to form the so-called future internet of things (IoT). From this futuristic perspective, everything should have its own identity. In this context, radio frequency identification (RFID) plays a specific role, which provides wireless communications in a secure manner. Passive RFID tags carry out work using the energy harvested among massive systems. RFID has been habitually realized as a prerequisite for IoT, the combination of which is called IoT RFID (I-RFID). For the current scenario, such tags should be productive, low-profile, compact, easily mountable, and have eco-friendly features. The presently available tags are not cost-effective and have not been proven as green tags for environmentally friendly IoT in 5G systems nor are they suitable for long-range communications in 5G systems. The proposed I-RFID tag uses the meandering angle technique (MAT) to construct a design that satisfies the features of a lower-cost printed antenna over the worldwide UHF RFID band standard (860–960 MHz). In our research, tag MAT antennas are fabricated on paper-based Korsnäs by screen- and flexo-printing, which have lowest simulated effective outcomes with dielectric variation due to humidity and have a plausible read range (RR) for European (EU; 866–868 MHz) and North American (NA; 902–928 MHz) UHF band standards. The I-RFID tag size is reduced by 36% to 38% w.r.t. a previously published case, the tag gain has been improved by 23.6% to 33.12%, and its read range has been enhanced by 50.9% and 59.6% for EU and NA UHF bands, respectively. It provides impressive performance on some platforms (e.g., plastic, paper, and glass), thereby providing a new state-of-the-art I-RFID tag with better qualities in 5G systems.

scholarly journals Low-Profile Flexible UHF RFID Tag Design for Wristbands Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Guan-Long Huang ◽  
Chow-Yen-Desmond Sim ◽  
Shu-Yao Liang ◽  
Wei-Sheng Liao ◽  
Tao Yuan
Keyword(s):  
Radio Frequency Identification ◽  
Free Space ◽  
Complex Impedance ◽  
Uhf Rfid ◽  
Healthcare Applications ◽  
Space Condition ◽  
Rfid Tag ◽  
Low Profile ◽  
Frequency Identification ◽  
Slot Cavity

In this study, a low-profile ultrahigh frequency (UHF) radio-frequency identification (RFID) tag antenna designed for wristbands in healthcare applications is proposed. The radiator is based on the open-slot cavity technique that is composed of a slotted patch (double-T slots) loaded onto a flexible open cavity. The proposed slotted design can easily allow the tag’s input impedance to be tuned to the complex impedance of typical UHF RFID chips. The proposed tag antenna has a size of 86 mm × 25 mm × 1.6 mm (0.26λ0×0.07λ0×0.004λ0) at 915 MHz, and it can yield a maximum reading range of 8 m (stand alone in free-space condition), 6.6 m (when placed on the human wrist in free-space condition), and up to 3 m (when placed on the human wrist in a crowded condition).

scholarly journals An Efficient Q -Algorithm for RFID Tag Anticollision

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Lingyun Zhao ◽  
Lukun Wang ◽  
Shan Du
Keyword(s):  
Large Scale ◽  
Item Information ◽  
Rfid Tags ◽  
Uhf Rfid ◽  
Tag Identification ◽  
Rfid Tag ◽  
Iot Applications ◽  
Rfid System ◽  
Collision Problem ◽  
Radiofrequency Identification

In large-scale Internet of Things (IoT) applications, tags are attached to items, and users use a radiofrequency identification (RFID) reader to quickly identify tags and obtain the corresponding item information. Since multiple tags share the same channel to communicate with the reader, when they respond simultaneously, tag collision will occur, and the reader cannot successfully obtain the information from the tag. To cope with the tag collision problem, ultrahigh frequency (UHF) RFID standard EPC G1 Gen2 specifies an anticollision protocol to identify a large number of RFID tags in an efficient way. The Q -algorithm has attracted much more attention as the efficiency of an EPC C1 Gen2-based RFID system can be significantly improved by only a slight adjustment to the algorithm. In this paper, we propose a novel Q -algorithm for RFID tag identification, namely, HTEQ, which optimizes the time efficiency of an EPC C1 Gen2-based RFID system to the utmost limit. Extensive simulations verify that our proposed HTEQ is exceptionally expeditious compared to other algorithms, which promises it to be competitive in large-scale IoT environments.

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