scholarly journals Development of Enhanced Range, High Q, Passive, Chipless RFID Tags for Continuous Monitoring and Sensing Applications

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 127
Author(s):  
Aiswarya S ◽  
Sreedevi K. Menon ◽  
Massimo Donelli
Keyword(s):  
Continuous Monitoring ◽  
Analytical Formula ◽  
High Sensitivity ◽  
Proof Of Concept ◽  
Rfid Tag ◽  
High Q ◽  
Dielectric Substrates ◽  
Sensing Applications ◽  
Chipless Rfid ◽  
System Prototype

A high Q planar chipless RFID tag with high sensitivity is proposed for communication applications. In particular, the tag structure is composed of a complementary spiral structure (CSS) that is able to provide high sensitivity and compactness. A semi analytical formula for the design of a single bit tag is derived, and the behaviour of the CSS is analysed for different dielectric substrates. Different tags, composed of up to a set of eight resonators, have been numerically and experimentally assessed. In particular, a system prototype composed of a reader and a set of tags are fabricated and experimentally assessed as a proof of concept. The system provided an operative range of tens of centimetres (a maximum operative range of 65 cm). The obtained results are quite promising and the agreement between simulated and measured results are found to be good.

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.

Impact of Dielectric Substrates on Chipless RFID Tag Performance

2021 ◽  
Author(s):  
Amjad Ali ◽  
Christopher Smartt ◽  
Jisun Im ◽  
Roderick Mackenzie ◽  
Orla Williams ◽  
...  
Keyword(s):  
Rfid Tag ◽  
Dielectric Substrates ◽  
Chipless Rfid

scholarly journals High-Density 3D Printable Chipless RFID Tag with Structure of Passive Slot Rings

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2535 ◽  
Author(s):  
Zhonghua Ma ◽  
Yanfeng Jiang
Keyword(s):  
Radio Frequency Identification ◽  
Low Cost ◽  
Vertical Direction ◽  
High Sensitivity ◽  
High Density ◽  
Frequency Spectra ◽  
Rfid Tag ◽  
Rectangular Slot ◽  
Chipless Rfid ◽  
Electric Field Direction

A three-dimensional (3D) printable chipless radio frequency identification (RFID) tag, with high density and sensitivity, is proposed and fulfilled on insulator substrates. By printing a rectangular slot ring and designing specific geometry on the substrate, the printed structure shows high sensitivity in a resonant manner, with the benefits of high density and low cost. Considering the multiple rectangular rings with different sizes in a concentric distribution, a bit coding sequence can be observed in frequency spectra because of the corresponding different resonant frequencies aroused by the printed slots. In this way, the 3D printable chipless RFID tag can be fulfilled by adopting the structure of the rectangular slot ring on the insulated substrates. The main characteristics of the designed rectangular slot rings are verified on both flexible and solid substrates. A 12-bit chipless tag based on the slot ring structures is designed and implemented. The simulation and experiment results show good agreement on its characteristics. The frequency response reveals the fact that the 2th, 3th and 4th harmonic do not exist, which is a unique merit for improving the encoding capacity and the sensitivity of the corresponding reader. The electric field direction of the electromagnetic wave of the reader excitation tag is demonstrated to be wide, up to 90° on the tag horizontal plane, 30° on the vertical direction.

scholarly journals Relative Humidity Sensors Based on Microfiber Knot Resonators—A Review

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5196 ◽  
Author(s):  
Young-Geun Han
Keyword(s):  
Relative Humidity ◽  
High Sensitivity ◽  
Physical Parameters ◽  
Humidity Sensors ◽  
Coating Materials ◽  
High Q ◽  
Sensing Applications ◽  
Compact Size ◽  
The Many ◽  
Humidity Sensitivity

Recent research and development progress of relative humidity sensors using microfiber knot resonators (MKRs) are reviewed by considering the physical parameters of the MKR and coating materials sensitive to improve the relative humidity sensitivity. The fabrication method of the MKR based on silica or polymer is briefly described. The many advantages of the MKR such as strong evanescent field, a high Q-factor, compact size, and high sensitivity can provide a great diversity of sensing applications. The relative humidity sensitivity of the MKR is enhanced by concerning the physical parameters of the MKR, including the waist or knot diameter, sensitive materials, and Vernier effect. Many techniques for depositing the sensitive materials on the MKR surface are discussed. The adsorption effects of water vapor molecules on variations in the resonant wavelength and the transmission output of the MKR are described regarding the materials sensitive to relative humidity. The sensing performance of the MKR-based relative humidity sensors is discussed, including sensitivity, resolution, and response time.

High Sensitivity Stress Sensor Based on Chipless RFID Tag

2021 ◽  
Author(s):  
Junjie Zhang ◽  
Qiangzhi Fu ◽  
Lei Song ◽  
Bian Wu
Keyword(s):  
High Sensitivity ◽  
Stress Sensor ◽  
Rfid Tag ◽  
Chipless Rfid

scholarly journals A Compact Double-Folded Substrate Integrated Waveguide Re-Entrant Cavity for Highly Sensitive Humidity Sensing

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3308 ◽  
Author(s):  
Zhihua Wei ◽  
Jie Huang ◽  
Jing Li ◽  
Junshan Li ◽  
Xuyang Liu ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
High Sensitivity ◽  
Substrate Integrated Waveguide ◽  
Humidity Sensing ◽  
Food Industries ◽  
High Q ◽  
Sensing Applications ◽  
Compact Size ◽  
Highly Sensitive ◽  
Humidity Chamber

In this study, an ultra-compact humidity sensor based on a double-folded substrate integrated waveguide (SIW) re-entrant cavity was proposed and analyzed. By folding a circular re-entrant cavity twice along its two orthogonally symmetric planes, the designed structure achieved a remarkable size reduction (up to 85.9%) in comparison with a conventional TM010-mode circular SIW cavity. The operating principle of the humidity sensor is based on the resonant method, in other words, it utilizes the resonant properties of the sensor as signatures to detect the humidity condition of the ambient environment. To this end, a mathematical model quantitatively relating the resonant frequency of the sensor and the relative humidity (RH) level was established according to the cavity perturbation theory. The sensing performance of the sensor was experimentally validated in a RH range of 30%–80% by using a humidity chamber. The measured absolute sensitivity of the sensor was calculated to be 135.6 kHz/%RH, and the corresponding normalized sensitivity was 0.00627%/%RH. It was demonstrated that our proposed sensor not only has the merits of compact size and high sensitivity, but also benefits from a high Q-factor and ease of fabrication and integration. These advantages make it an excellent candidate for humidity sensing applications in various fields such as the agricultural, pharmaceutical, and food industries.

scholarly journals A Novel Detection Technique for a Chipless RFID System Using Quantile Regression

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 409 ◽  
Author(s):  
Mohammedhusen Manekiya ◽  
Massimo Donelli ◽  
Abhinav Kumar ◽  
Sreedevi Menon
Keyword(s):  
Quantile Regression ◽  
Radio Frequency Identification ◽  
Proof Of Concept ◽  
Time Data ◽  
Rfid System ◽  
Novel Approach ◽  
Chipless Rfid ◽  
Frequency Identification ◽  
Detection Capabilities ◽  
System Prototype

This work presents a novel approach for improving the detection capabilities of a chipless Radio Frequency Identification (RFID) system based on quantile regression. The main drawback of chipless RFID systems is the limited response of the tags due to the low-quality factor of the resonators, used to encode the information in the tag. The detection becomes very challenging especially for real-time data when noise is present. This work proposes the use of quantile regression to enhance the system performance. A chipless RFID system prototype has been fabricated (as a proof of concept) and experimentally assessed. The obtained results are quite satisfactory in the potentialities of the proposed methodology.

Design of Dual Band Meta-Material Resonator Sensor for Material Characterization

2021 ◽  
Vol 36 (4) ◽  
pp. 473-478
Author(s):  
Sucitra Harry ◽  
Zahriladha Zakaria ◽  
Maizatul Said ◽  
Rammah Alahnomi ◽  
M. Misran
Keyword(s):  
Resonance Frequency ◽  
Material Characterization ◽  
Empirical Equation ◽  
Narrow Band ◽  
High Sensitivity ◽  
Dual Band ◽  
Network Analyzer ◽  
Q Factor ◽  
High Q ◽  
Sensing Applications

This paper describes the design and implementation of the dual band metamaterial resonator for sensing applications by employing perturbation theory in which the dielectric properties of resonator affect Q-factor and resonance frequency. The designed sensor operates at two resonance frequency 3.20 GHz and 4.18 GHz in the range of 1 GHz to 5.5 GHz for testing solid materials. The Computer Simulation Technology (CST) software is used to design and model this sensor and it was analyzed by using vector network analyzer (VNA) for testing measurement. This study uses empirical equation from the tested materials with well-known permittivity to estimate the permittivity of other materials with unknown permittivity. The proposed sensor has achieved a narrow band with high Q-factor value of 642 and 521 at the operating frequencies of 3.16 GHz and 4.18 GHz respectively. These findings are compared with findings of previous study and the proposed sensor has achieved a high sensitivity and accuracy of 80% compare to others. This is proof that this senor could be used to characterize materials and sensing applications.

Realization of High-Q Fano Resonances in Ceramic Dielectric Metamaterials for Sensing Applications

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000087-000093
Author(s):  
Elena Semouchkina ◽  
Arash Hosseinzadeh ◽  
George Semouchkin
Keyword(s):  
Numerical Experiments ◽  
Microstrip Line ◽  
High Sensitivity ◽  
Fano Resonances ◽  
High Q ◽  
Sensing Applications ◽  
Microwave Sensor ◽  
Q Factors ◽  
New Applications ◽  
Very High

Ceramic all-dielectric metamaterials are found to support very high Q resonances of the Fano-type, which until recently were largely attributed to the atomic physics phenomena. It is shown that proper arrangement of ceramic resonators in the metamaterial array allowsd for obtaining Q factors up to 15000. Thus high Q factors could be employed for new applications, in particular, for advanced sensing. An opportunity to design compact arrays that could be incorporated in a microwave sensor fed by a microstrip line is demonstrated. Numerical experiments have confirmed that Fano resonances in such arrays conserve high sensitivity to the dielectric permittivity of the controlled media.

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