Estimation of Backscattered Signals of Frequency-coded Chipless RFID Tag

Chipless radiofrequency identification (RFID) technology is very promising for sensing, identification, and tracking for future Internet of Things (IoT) systems and applications. In this paper, we propose and demonstrate a compact 18-bit, dual polarized chipless RFID tag. The proposed tag is based on L-shaped resonators designed so as to maximize the spectral and spatial encoding capacities. The proposed RFID tag operates an over 4 GHz frequency band (i.e., 6.5 GHz to 10.5 GHz). The tag is simulated, fabricated, and tested in a nonanechoic milieu. The measured data have shown good agreement with the simulation results, with respect to resonators’ frequency positions, null depth, and null bandwidth over the operating spectrum. The proposed design achieves spectral and spatial encoding capacities of 4.5 bits/GHz and 18.8 bits/cm2, respectively. This, in turn, gives an encoding density of 4.7 bits/GHz/cm2. For code identification, we exploit the frequency content of the backscattered signals and identify similarity/correlation features with reference codes.

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A Depolarizing Chipless RFID Tag with Humidity Sensing Capability

2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting ◽

10.1109/apusncursinrsm.2018.8609386 ◽

2018 ◽

Cited By ~ 6

Author(s):

ShangBin Fan ◽

TianHai Chang ◽

XiongYing Liu ◽

Yi Fan ◽

Manos M. Tentzeris

Keyword(s):

Humidity Sensing ◽

Rfid Tag ◽

Chipless Rfid

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

Wireless Power Transfer ◽

10.1017/wpt.2015.12 ◽

2015 ◽

Vol 2 (2) ◽

pp. 86-96 ◽

Cited By ~ 4

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.

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A 50.7-Bit Retransmission-Based Chipless RFID Tag With Miniaturized Resonators

2021 IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT) ◽

10.1109/wisnet51848.2021.9413790 ◽

2021 ◽

Author(s):

Reza Ebrahimi Ghiri ◽

Kamran Entesari

Keyword(s):

Rfid Tag ◽

Chipless Rfid

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

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000362 ◽

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

Textile Research Journal ◽

10.1177/0040517521989780 ◽

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.

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