| 1. |
- Rauf, Shahid, et al.
(författare)
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Triangular loop resonator based compact chipless RFID tag
- 2017
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Ingår i: IEICE Electronics Express. - : IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG. - 1349-2543. ; 14:4
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Tidskriftsartikel (refereegranskat)abstract
- A novel, frequency selective surface (FSS) inspired, fully passive, chipless data encoding circuit capable of being operated as a radio frequency identification (RFID) tag is presented. The tag is composed of finite repetitions of the unit cell realized on a grounded FR4 substrate having an overall size of 27.5 x 30mm(2). The unit cell is made up of several triangle-shaped resonators patterned in a looped fashion. Variation in the geometric structure of the tag, achieved by addition or removal of nested loops, corresponds to a specific bit sequence. Each sequence is represented in the spectral domain as a unique frequency signature of the resonators. The proposed 10-bit tag covers the spectral range from 4 to 11 GHz. The tag is compact, robust, and exhibits a stable response to impinging signals at different angles of incidence.
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| 2. |
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| 3. |
- Khan, Ameer Taimour, et al.
(författare)
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Design of a Cobweb Shape Chipless RFID Tag
- 2021
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Ingår i: Microwave journal (International ed.). - : Horizon House Publications. - 0192-6225. ; 64:5, s. 90-100
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Tidskriftsartikel (refereegranskat)abstract
- A nested octagon passive chipless radio frequency identification (RFID) tag with an encoding capacity of 12 bits has polarization diversity and 1:1 slot-to-bit correspondence. Its compact 23 x 23 mm footprint yields a bit density of 2.26 bits/cm(2). The tag is fabricated on a flexible Rogers RT/duroid 5880 laminate.
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| 4. |
- Khan, Umar Hasan, et al.
(författare)
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Novel chipless displacement sensor circuit using spurline resonantor
- 2016
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Ingår i: IEICE Electronics Express. - : Institute of Electronics Information Communication Engineers. - 1349-2543. ; 13:23
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Tidskriftsartikel (refereegranskat)abstract
- A novel uni-dimensional chipless displacement sensor circuit based on spurline resonators is presented. Sensor circuit design consists of two components: series of spurline resonators and a selector element. In response to displacement, the selector element slides over the spurline resonator slots that translating this movement into a corresponding change in the circuit's frequency response. The designed circuit offers a capacity of 16 bits in the 2-4.2 GHz frequency band. Half of the bits are designated as the sensory bits, while the other half are attributed as the ID bits. The formulated sensor has a dynamic range from 0-3.75 mm and a minimum resolution of 0.25 mm. The proposed sensor is a prime candidate for deployment in smart cities for ubiquitous infrastructural health monitoring.
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| 5. |
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| 6. |
- Riaz, Muhammad Ali, et al.
(författare)
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Novel Butterfly Slot Based Chipless RFID Tag
- 2018
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Ingår i: Radioengineering. - : SPOLECNOST PRO RADIOELEKTRONICKE INZENYRSTVI. - 1210-2512 .- 1805-9600. ; 27:3, s. 776-783
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Tidskriftsartikel (refereegranskat)abstract
- A compact chipless RFID tag with robust readable features is presented in this paper. The tag is made up of novel concentric butterfly slot resonators. Bit data is encoded in the frequency signature of the tag. Each slot corresponds to a resonance peak representing a bit '1', whereas an absence of the peak signifies a bit '0'. Proposed resonator design demonstrates insensitivity to different polarization and incident angles of the linearly polarized impinging electromagnetic wave. The tag operates in the frequency band of 4.7-9.7 GHz, limited within the license free ultra wide-band. Rogers RT/duroid (R) 5880 substrate is used to realize a 10-bit capacity design that spans 14 x 14 mm(2) resulting in a bit density of 5.1 bits/cm(2).
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| 7. |
- Saeed, Ayesha, et al.
(författare)
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Robust and efficient EBG-backed wearable antenna for ISM applications
- 2021
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Ingår i: Turkish Journal of Electrical Engineering and Computer Sciences. - : Turkiye Klinikleri. - 1300-0632 .- 1303-6203. ; 29:7, s. 3036-3052
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Tidskriftsartikel (refereegranskat)abstract
- A structurally compact, semiflexible wearable antenna composed of a distinctively miniaturized electromagnetic band gap (EBG) structure is presented in this work. Designed for body-centric applications in the 5.8 GHz band, the design draws heavily from a novel planar geometry realized on Rogers RT/duroid 5880 laminate with a compact physical footprint spanning lateral dimensions of 0.6 lambda 0 x 0.06 lambda 0. Incorporating a 2 x 2 EBG structure at the rear of the proposed design ensures sufficient isolation between the body and the antenna, doing away with the performance degradation associated with high permittivity of the tissue layer. The peculiar antenna geometry allows for reduced backward radiation and low specific absorption rate (SAR). With the inclusion of EBG, the gain of the antenna undergoes a considerable increase to 7.2 dBi with more than 95% reduction in SAR value. In addition, the front-to-back ratio also amplified to 13 dB. A rigorous analysis detailing the structural robustness is reported for varied bend angle configurations of the proposed antenna. To assess the suitability of the proposed design as a body-worn antenna, an experimental investigation is carried out on different parts of the body. Experimental findings are congruent with computationally obtained results, validating the applicability of the novel antenna structure for body-worn applications.
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| 8. |
- Saeed, Ayesha, et al.
(författare)
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Robustness-Driven Hybrid Descriptor for Noise-Deterrent Texture Classification
- 2019
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Ingår i: IEEE Access. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 2169-3536. ; 7, s. 110116-110127
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Tidskriftsartikel (refereegranskat)abstract
- A robustness-driven hybrid descriptor (RDHD) for noise-deterrent texture classification is presented in this paper. This paper offers the ability to categorize a variety of textures under challenging image acquisition conditions. An image is initially resolved into its low-frequency components by applying wavelet decomposition. The resulting low-frequency components are further processed for feature extraction using completed joint-scale local binary patterns (CJLBP). Moreover, a second feature set is obtained by computing the low order derivatives of the original sample. The evaluated feature sets are integrated to get a final feature vector representation. The texture-discriminating performance of the hybrid descriptor is analyzed using renowned datasets: Outex original, Outex extended, and KTH-TIPS. The experimental results demonstrate a stable and robust performance of the descriptor under a variety of noisy conditions. An accuracy of 95.86%, 32.52%, and 88.74% at noise variance of 0.025 is achieved for the given datasets, respectively. A comparison between performance parameters of the proposed paper with its parent descriptors and recently published paper is also presented.
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| 9. |
- Shahid, Humayun, et al.
(författare)
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Novel QR-incorporated chipless RFID tag
- 2019
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Ingår i: IEICE Electronics Express. - : IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG. - 1349-2543. ; 16:5
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Tidskriftsartikel (refereegranskat)abstract
- This work ideates a novel approach for designing a QR-incorporated data encoding structure that functions as a fully-passive, chipless radio frequency identification (RFID) tag. Several concentric square-shaped resonant slots embedded strategically within a QR-patterned region constitute the tag. A functional prototype is realized over an ungrounded Duroid (R) 5880 substrate, and the same is evaluated for its electromagnetic performance. The tag performs encoding of up to 118 data bits distributed across spectral and optical domain in a compact form factor measuring 55 x 55 mm(2). Possible applications of the formulated tag include multi-layer authentication for secure access control in smart cities and connected homes.
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| 10. |
- Tariq, Nimra, et al.
(författare)
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Orientation Independent Chipless RFID Tag Using Novel Trefoil Resonators
- 2019
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Ingår i: IEEE Access. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 2169-3536. ; 7, s. 122398-122407
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, a compact and fully passive bit encoding circuit, capable of operating as a chipless radio frequency identification (RFID) tag is presented. The structure consists of novel concentric trefoil-shaped slot resonators realized using Rogers RT/duroid (R) 5880 laminate, occupying a physical footprint of 13.55 x 13.55 mm(2). Each resonating element is associated with a particular data bit, having a 1:1 resonator-to-bit correspondence. Bit sequences are configured through introducing modifications in the geometric structure either by addition or exclusion of each nested slot resonator. Such changes manifest directly in the electromagnetic signature of the tag as presence or absence of corresponding resonant peaks. The proposed 10-bit tag offers minimized inter-resonator mutual coupling and insensitivity to changes in polarization and incident angles thereby demonstrating orientation independent functionality. Moreover, error-free encoding is achieved through stabilizing the shift in resonant frequencies for a variety of different geometric configurations and orientation of the structure. The tag operates within the license-free ultrawideband ranging from 5.4 to 10.4 GHz, providing spectral bit capacity and bit density of 2 bits/GHz and 5.44 bits/cm(2) respectively.
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