Spatially Efficient Chipless RFID Tag, Screen-printed on Flexible Substrate

2018 ◽  
Author(s):  
S. Shrestha ◽  
R.P. Yerramilli ◽  
N.C. Karmakar
Keyword(s):  
Flexible Substrate ◽  
Rfid Tag ◽  
Chipless Rfid ◽  
Screen Printed

Design and characterization of novel fabric-based multi-resonators for wearable chipless RFID applications

2021 ◽  
pp. 004051752198978
Author(s):  
Huating Tu ◽  
Yaya Zhang ◽  
Hong Hong ◽  
Jiyong Hu ◽  
Xin Ding
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Printed Circuit Boards ◽  
Signal Transmission ◽  
Circuit Boards ◽  
Cross Sectional ◽  
Rfid Tag ◽  
Response Characteristics ◽  
Chipless Rfid ◽  
Screen Printed

Nowadays, the chipless radio frequency identification (RFID) tag is attracting significant attention owing to its immense potential in tracking. However, most of the chipless tags are fabricated on hard printed circuit boards, and the wearable fabric-based chipless tag is still in the research stage. In this paper, a symmetrical 3rd L-shaped multi-resonator wearable chipless RFID tag is designed and screen-printed onto fabric. In order to investigate the influence of the non-uniform conductive layer on the signal transmission at high frequency, the surface and cross-sectional topographies of the printed conductive film are analyzed and the frequency response characteristics are simulated and measured. The obtained results show that the common fabric can be used as the substrate to screen print the L-shaped multi-resonators of the chipless RFID tag, and the quality of the screen printed line, especially a narrow line, significantly affects the radio frequency performance. For the screen-printed 3rd L-shaped stub resonators, the relative frequency shift compared with the simulation results are 0.99%, 0.88% and 2.26%, respectively. Generally, the surface morphology of fabric and screen-printed precision are critical in improving the performance of L-shaped multi-resonators.

Design of fully printable and configurable chipless RFID tag on flexible substrate

2011 ◽  
Vol 54 (1) ◽  
pp. 226-230 ◽  
Author(s):  
Botao Shao ◽  
Qiang Chen ◽  
Ran Liu ◽  
Li-Rong Zheng
Keyword(s):  
Flexible Substrate ◽  
Rfid Tag ◽  
Chipless Rfid

scholarly journals Data Encoding Improvement and Size Reduction of Chipless RFID Tag Using Short-circuit Line Effect and Angle-based Divided Loops

2020 ◽  
Vol 30.8 (147) ◽  
pp. 1-6
Author(s):  
Thanh Huong Nguyen ◽  
◽  
Duc Quang Tran ◽  
Keyword(s):  
Short Circuit ◽  
Flexible Substrate ◽  
Large Data ◽  
Rfid Tag ◽  
Data Encoding ◽  
Chipless Rfid ◽  
Data Density ◽  
Frequency Position ◽  
Structure Dimension ◽  
Electromagnetic Backscattering

This paper focuses on a short circuit and concentric loop effects to improve the structure dimension as well as enhance the ability to encode electromagnetic wave data for chipless RFID tags. The tag is composed of star-shaped rings that are concentrically nested together. The following factors help reduce the tag size: using the phenomenon of electromagnetic backscattering, assessment by the Radar Cross Section (RCS), the antenna-free tag only includes the multi-frequency resonators. By inserting short circuit lines combined with concentric loops, the number of resonant peaks increases exponentially without increasing the tag overall dimension. In addition, by inserting the short circuit lines at different angles between the two consecutive loops, we can adjust the resonant frequency in the frequency bands, thereby changing the value of the bit by shifting the frequency position. The overall dimension of the resulted tag is 13mmx13 mm and the tag is aimed to be a printable tag on the flexible substrate to minimize the fabrication cost. With the 18-vertex star-shaped tag with five concentric loops, this chipless RFID tag can encode up to 16 bits with high resolution and large data density.

scholarly journals Screen-Printed Depolarizing Chipless RFID Tag Based on Asymmetric Configurations

2021 ◽  
Author(s):  
Ruiqi Wang ◽  
Zubair Akhter ◽  
Weiwei Li ◽  
Atif Shamim
Keyword(s):  
Rfid Tag ◽  
Chipless Rfid ◽  
Screen Printed

scholarly journals On the application of the EM-imaging for chipless RFID tags

2015 ◽  
Vol 2 (2) ◽  
pp. 86-96 ◽  
Author(s):  
M. Zomorrodi ◽  
N.C. Karmakar
Keyword(s):  
Radio Frequency Identification ◽  
Low Cost ◽  
60 Ghz ◽  
Rfid Tag ◽  
High Data ◽  
Data Encoding ◽  
Bending Effect ◽  
Chipless Rfid ◽  
Frequency Identification ◽  
Cost Item

The electromagnetic (EM) imaging technique at mm-band 60 GHz is proposed for data encoding purpose in the chipless Radio Frequency Identification (RFID) systems. The fully printable chipless RFID tag comprises tiny conductive EM polarizers to create high cross-polar radar cross-section. Synthetic aperture radar approach is applied for formation of the tag's EM-image and revealing the tag's content. The achieved high data encoding capacity of 2 bits/cm2in this technique based on a fully printable tag is very convincing for many applications. The system immunity to multipath interference, bending effect, and printing inaccuracy suggests huge potentials for low-cost item tagging. Tags are also readable through a tick paper envelop; hence secure identification is provided by the proposed technique.

A low-profile FSS-based high capacity chipless RFID tag for sensing and encoding applications

2021 ◽  
pp. 1-9
Author(s):  
Shahid Habib ◽  
Amjad Ali ◽  
Ghaffer Iqbal Kiani ◽  
Wagma Ayub ◽  
Syed Muzahir Abbas ◽  
...  
Keyword(s):  
Radio Frequency Identification ◽  
High Capacity ◽  
Frequency Selective Surface ◽  
Rfid Tag ◽  
Sensing Applications ◽  
Low Profile ◽  
Simple Geometry ◽  
Chipless Rfid ◽  
Frequency Identification ◽  
Good Agreement

Abstract This paper presents a polarization-independent 11-bit chipless RFID tag based on frequency-selective surface which has been designed for encoding and relative humidity (RH) sensing applications. The 10 exterior U-shaped resonators are used for item encoding whereas Kapton has been incorporated with the interior resonator for RH sensing. This radio-frequency identification (RFID) tag operates in S- and C-frequency bands. The proposed design offers enhanced fractional bandwidth up to 88% with the density of 4.46 bits/cm2. Both single- and dual-layer tags have been investigated. The simulated results are in good agreement with measured results and a comparison with existing literature is presented to show the performance. Simple geometry, high code density, large frequency signature bandwidth, high magnitude bit, high radar cross-section, and angular stability for more than 75° are the unique outcomes of the proposed design. In addition, RH sensing has been achieved by integrating the Kapton on the same RFID tag.

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