The Experts below are selected from a list of 4758 Experts worldwide ranked by ideXlab platform
Xiao Dong Chen - One of the best experts on this subject based on the ideXlab platform.
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a broadband near field uhf rfid reader antenna with low far field gain
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yuan Yao, Yishan Liang, Xiao Dong ChenAbstract:A broadband magnetic coupling antenna with low far-field gain for Ultrahigh Frequency radio Frequency identification near-field applications is presented in this communication. The proposed antenna is consisted of a number of loop units and each unit has in-phase current along the loop. It generates a strong uniformly distributed magnetic field over a large interrogation. To meet different scenarios, the interrogated area can be adjusted by changing the number of units. The proposed antenna has low far-field gain and broadband characteristics. Mechanism analysis is carried out to provide the guidelines for the antenna design. As an example, a 10-unit antenna has been fabricated and measured. The experimental results show that the antenna achieves the impedance matching over the Frequency range from 740 to 4600 MHz. And the proposed antenna achieves 100% reading rate with 140 button tags in the region of 100 mm $\times750$ mm $\times12$ mm.
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a meander line uhf rfid reader antenna for near field applications
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yuan Yao, Caixia Cui, Xiao Dong ChenAbstract:A novel Ultrahigh Frequency radio Frequency identification reader antenna based on electromagnetic coupling between two open-ended microstrip (MS) meander lines for near-field applications is investigated in this paper. The corresponding currents flowing along the two MS meander lines are reversed in phase with approximately identical amplitudes. Meander-line units are introduced to achieve a uniform distribution of strong magnetic and electric fields. The performance of an antenna prototype comprised of six pairs of meander lines is analyzed. The proposed antenna simultaneously exhibits a uniform magnetic field distribution with a reading region of 480 mm $\times200$ mm $\times20$ mm and a uniform linear electric field distribution with a reading region of 480 mm $\times420$ mm $\times300$ mm. The proposed antenna exhibits a low far-field gain, and has a bandwidth from 914 to 929 MHz. Both simulated and measured results have shown a good performance of the antenna.
Jyongsik Jang - One of the best experts on this subject based on the ideXlab platform.
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wireless room temperature volatile organic compound sensor based on polypyrrole nanoparticle immobilized Ultrahigh Frequency radio Frequency identification tag
ACS Applied Materials & Interfaces, 2016Co-Authors: Jaemoon Jun, Dong Hoon Shin, Sung Gun Kim, Jun Seop Lee, Wooyoung Kim, Jyongsik JangAbstract:Due to rapid advances in technology which have contributed to the development of portable equipment, highly sensitive and selective sensor technology is in demand. In particular, many approaches to the modification of wireless sensor systems have been studied. Wireless systems have many advantages, including unobtrusive installation, high nodal densities, low cost, and potential commercial applications. In this study, we fabricated radio Frequency identification (RFID)-based wireless sensor systems using carboxyl group functionalized polypyrrole (C-PPy) nanoparticles (NPs). The C-PPy NPs were synthesized via chemical oxidation copolymerization, and then their electrical and chemical properties were characterized by a variety of methods. The sensor system was composed of an RFID reader antenna and a sensor tag made from a commercially available Ultrahigh Frequency RFID tag coated with C-PPy NPs. The C-PPy NPs were covalently bonded to the tag to form a passive sensor. This type of sensor can be produced at...
Yuan Yao - One of the best experts on this subject based on the ideXlab platform.
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a broadband near field uhf rfid reader antenna with low far field gain
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yuan Yao, Yishan Liang, Xiao Dong ChenAbstract:A broadband magnetic coupling antenna with low far-field gain for Ultrahigh Frequency radio Frequency identification near-field applications is presented in this communication. The proposed antenna is consisted of a number of loop units and each unit has in-phase current along the loop. It generates a strong uniformly distributed magnetic field over a large interrogation. To meet different scenarios, the interrogated area can be adjusted by changing the number of units. The proposed antenna has low far-field gain and broadband characteristics. Mechanism analysis is carried out to provide the guidelines for the antenna design. As an example, a 10-unit antenna has been fabricated and measured. The experimental results show that the antenna achieves the impedance matching over the Frequency range from 740 to 4600 MHz. And the proposed antenna achieves 100% reading rate with 140 button tags in the region of 100 mm $\times750$ mm $\times12$ mm.
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a meander line uhf rfid reader antenna for near field applications
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yuan Yao, Caixia Cui, Xiao Dong ChenAbstract:A novel Ultrahigh Frequency radio Frequency identification reader antenna based on electromagnetic coupling between two open-ended microstrip (MS) meander lines for near-field applications is investigated in this paper. The corresponding currents flowing along the two MS meander lines are reversed in phase with approximately identical amplitudes. Meander-line units are introduced to achieve a uniform distribution of strong magnetic and electric fields. The performance of an antenna prototype comprised of six pairs of meander lines is analyzed. The proposed antenna simultaneously exhibits a uniform magnetic field distribution with a reading region of 480 mm $\times200$ mm $\times20$ mm and a uniform linear electric field distribution with a reading region of 480 mm $\times420$ mm $\times300$ mm. The proposed antenna exhibits a low far-field gain, and has a bandwidth from 914 to 929 MHz. Both simulated and measured results have shown a good performance of the antenna.
Malathi Kanagasabai - One of the best experts on this subject based on the ideXlab platform.
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a novel uhf near field rfid reader antenna deploying csrr elements
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Jayaram Kizhekke Pakkathillam, Malathi KanagasabaiAbstract:A novel Ultrahigh Frequency (UHF) near-field radio-Frequency identification (RFID) reader antenna based on the complementary split ring resonator (CSRR) elements is presented in this communication. The antenna consists of a power divider and two arms. The two arms are terminated with two 50- $\Omega $ terminations. First arm is forward arm, which is a microstrip transmission line. The second arm is backward arm, which is loaded with CSRR elements, instigating backward wave propagation. The oppositely directed currents are generated by this configuration to produce strong and uniform magnetic field over the antenna plane for UHF near-field RFID operations. The proposed antenna operates from 0.76 to 0.88 GHz, and a total impedance bandwidth of 120 MHz is obtained. A near-field read range of 100 mm and an interrogation area of 220 mm $\times180$ mm over the antenna plane at a height of 50 mm is reported for this antenna.
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compact multiservice uhf rfid reader antenna for near field and far field operations
IEEE Antennas and Wireless Propagation Letters, 2017Co-Authors: Jayaram Kizhekke Pakkathillam, Malathi Kanagasabai, Gulam Nabi M AlsathAbstract:This letter presents a compact Ultrahigh Frequency multiservice radio Frequency identification reader antenna for near-field and far-field operations. The far field is circularly polarized, and the strong near field is generated using inductive coupling. The dimension of the prototype is 83 × 83 × 1.6 mm 3. The prototype is based on a rectangular slot antenna, fed by an L-shaped feed. An integrated near-field and far-field radiator along with asymmetric slot perturbation result in circular polarization. The strong magnetic field in the near-field is generated by a configuration of stubs in the radiator, which bring oppositely directed current over the antenna plane. The antenna exhibits an impedance bandwidth of 110 MHz. The axial-ratio bandwidth (ARBW) of 37 MHz is also reported. A near-field interrogation area of 220 × 180 mm2 is reported for this antenna.
Keith A Nelson - One of the best experts on this subject based on the ideXlab platform.
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high Frequency surface acoustic wave propagation in nanostructures characterized by coherent extreme ultraviolet beams
Applied Physics Letters, 2009Co-Authors: Mark E Siemens, Margaret M Murnane, Henry C Kapteyn, Ronggui Yang, Erik H Anderson, Keith A NelsonAbstract:We study Ultrahigh Frequency surface acoustic wave propagation in nickel-on-sapphire nanostructures. The use of ultrafast, coherent, extreme ultraviolet beams allows us to extend optical measurements of propagation dynamics of surface acoustic waves to frequencies of nearly 50 GHz, corresponding to wavelengths as short as 125 nm. We repeat the measurement on a sequence of nanostructured samples to observe surface acoustic wave dispersion in a nanostructure series for the first time. These measurements are critical for accurate characterization of thin films using this technique.
