Compact cross loop resonator based chipless <scp>RFID</scp> tag with polarization insensitivity

Sajitha, V. R.; Nijas, C M; Roshna, T. K.; Vasudevan, K.; Mohanan, P.

doi:10.1002/mop.29706

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…The response of the tag has been measured using UWB horn antenna operating from 1 to 18 GHz having gain values from 7 dBi up to 12 dBi. The measurements have been [16] 7.9 3.1-10.6 Multiple resonators [17] 0.302 3.1-10.6 Cross loop [18] 1. The backscattered signature illustrates a null depth varying between 11 dB to 22.5 dB and from 7 dB to 16 dB for horizontal and vertical polarizations, respectively.…”

Section: Resultsmentioning

confidence: 99%

A Novel L-Shape Ultra Wideband Chipless Radio-Frequency Identification Tag

Issa

Ashraf

AlShareef

et al. 2017

International Journal of Antennas and Propagation

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A novel compact dual-polarized-spectral-signature-based chipless radio-frequency identification (RFID) tag is presented. Specifically, an L-shape resonator-based structure is optimized to have different spectral signatures in both horizontal and vertical polarizations, in order to double the encoding capacity. Resonators’ slot width and the space between closely placed resonators are also optimized to enhance the mutual coupling, thereby helping in achieving high-data encoding density. The proposed RFID tag operates over 5 GHz to 10 GHz frequency band. As a proof of concept, three different 18-bit dual-polarized RFID tags are simulated, fabricated, and tested in an anechoic chamber environment. The measurement data show reasonable agreement with the simulation results, with respect to resonators’ frequency positions, null depth, and their bandwidth over the operational spectrum.

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Section: Resultsmentioning

confidence: 99%

A Novel L-Shape Ultra Wideband Chipless Radio-Frequency Identification Tag

Issa

Ashraf

AlShareef

et al. 2017

International Journal of Antennas and Propagation

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“…In this case, the back scattered signal received by the reader (horn antenna connected to the network analyzer) consists of the reflected signal from the horn antenna impedance mismatch, the required frequency signature signal from the tag, the reflected signal from the metallic structure of the tag, the clutter noise from the surroundings, and the white noise. The effect of the horn impedance mismatch and the clutter noise can be approximately removed by an appropriate calibration technique [23,27,28]. In this work, the calibration method is employed by subtracting the reflection coefficient (S 11 ) of the measurement system without a tag from the reflection coefficient (S 11 ) with a tag.…”

Section: Experimental Validationmentioning

confidence: 99%

Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation

et al. 2019

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A novel and compact dual-polarized (DP) chipless radio-frequency identification (RFID) tag is presented in this paper. This tag can read both vertical and horizontal orientations within its frequency band, which improves the robustness and detection capability of the RFID system. The proposed tag makes use of the slot length variation encoding technique to improve the encoding capacity. This technique can duplicate the encoding capacity, thereby reducing the overall tag size by almost 50%. In particular, the proposed tag has an encoding capacity of 20 bits in the 3–8 GHz frequency band and achieves data density of around 15.15 bits/cm2. Three prototypes are fabricated and tested outside an anechoic chamber. Furthermore, one tag is tested at different distances (10 cm, 30 cm, and 60 cm) from the reader and the measured results are compared. The simulated and measured results are in reasonable agreement, with acceptable shifts at some frequencies due to fabrication and experimental errors.

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“…The reported structures are mainly designed to increase the bit density of the tags, but the overall bit density is estimated to be still low owing to their large dimensions of 17 × 68 mm 2 and 40 × 40 mm 2 (10,11) and low bit capacity of 5 bits. (12) Therefore, they are considered unsuitable for data-intensive applications. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Wireless Humidity Sensing with Chipless Radio Frequency Identification Tag

Wang,

He,

Song

et al. 2024

Sensors and Materials

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In this study, a compact and flexible chipless radio frequency identification humidity sensor with dimensions of 21 × 21 mm 2 is realized. The resonator structure consists of a square open ring and a U-shaped ring on a Rogers TMM 4(tm) substrate. The Kapton relative permittivity is very sensitive to changes in ambient humidity, and the sensor is capable of detecting humidity when the resonator is covered with a Kapton film. The amplitude of the radar scattering cross section increases monotonically from −65.66 to −58.14 dB with an offset of 7.52 dB when the relative humidity (RH) increases from 40 to 90%. The chipless sensor designed in this study has a compact size of only 21 × 21 mm 2 with good resonance characteristics, and with the Kapton thin film covering, the sensor exhibits an excellent sensitivity of 0.15 dB/% RH. It also has a wide humidity measurement range from 40 to 90%.

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Compact cross loop resonator based chipless RFID tag with polarization insensitivity

Cited by 11 publications

References 9 publications

A Novel L-Shape Ultra Wideband Chipless Radio-Frequency Identification Tag

A Novel L-Shape Ultra Wideband Chipless Radio-Frequency Identification Tag

Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation

Wireless Humidity Sensing with Chipless Radio Frequency Identification Tag

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