The Experts below are selected from a list of 1035 Experts worldwide ranked by ideXlab platform
Xianming Qing - One of the best experts on this subject based on the ideXlab platform.
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an artificial magnetic conductor backed electrically large zero phase shift line grid loop near field antenna
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yunjia Zeng, Zhi Ning Che, Xianming QingAbstract:A zero-phase-shift line (ZPSL) grid-loop antenna backed by an artificial magnetic conductor (AMC) is proposed to realize a uniform and strong magnetic field distribution over an electrically large Interrogation Zone for near-field wireless systems. The grid-loop configuration is able to achieve a uniform magnetic field distribution over an enlarged Interrogation Zone by enhancing the magnetic field in the central portion of the ZPSL loop. Moreover, an AMC comprised of four-arm spiral unit cells is designed to back the ZPSL grid-loop antenna for a directional field distribution and enhanced magnetic field intensity. The proposed antenna is exemplified as a reader antenna for ultrahigh frequency near-field radio frequency identification systems. By using an Impinj Speedway reader with an output power of 30 dBm, a 100% detection rate of Impinj J41 tags is achieved up to 90 mm over an Interrogation Zone of $200 \times 200$ mm2.
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UHF Near-Field RFID Antennas
2016Co-Authors: Qing Xianming, Xianming Qing, Zhi Ning ChenAbstract:ABSTRACT: Near-field radio frequency identification (RFID) technology has been traditionally used at low frequency (LF) and high frequency (HF) bands; now developing this technology at ultra high frequency (UHF) band is of increasingly interest. Designing a UHF near-field RFID reader antenna is one of the most challenging tasks. Traditional loop antennas cannot operate properly at the UHF band when the antennas tend electrically large so that they are unable to generate strong and uniform magnetic field in an adequate Interrogation Zone. A number of techniques have been presented to design UHF near-field RFID reader antennas, which enables the electrically large loop-type antenna generating desired magnetic field distribution. In this paper, the challenges of the UHF near-field antenna design are addressed. The state-of-art UHF near-field antenna techniques are reviewed and discussed
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enlargement of Interrogation Zone of zpsl loop antennas for uhf rfid systems
International Symposium on Antennas and Propagation, 2016Co-Authors: Yunjia Zeng, Xianming Qing, Zhi Ning Chen, Jianming JinAbstract:Zero-phase-shift line (ZPSL) loop antennas have recently attracted much interest by virtue of their uniform magnetic field distribution and electrically large size, which make them particularly useful as reader antennas in ultra-high frequency (UHF) near-field radio frequency identification (RFID) systems. Nevertheless, the challenge to theoretically characterize this type of antenna has led to difficulties in optimizing the loop for an electrically large Interrogation Zone as an RFID reader antenna. In this paper, we present for the first time the design methodology of the ZPSL loop antennas by applying the dispersion characteristics of the ZPSL structures. The perimeter of the loop antenna can be increased up to 3λ 0 without current reversal along the loop. Considering the tradeoff between the loop size and the strength of the magnetic field in the Interrogation Zone, a ZPSL loop prototype with a perimeter up to 2.5λ 0 is designed and optimized to verify the modeling and optimization experimentally.
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electrically large zero phase shift line grid array uhf near field rfid reader antenna
IEEE Transactions on Antennas and Propagation, 2014Co-Authors: Ji Shi, Xianming Qing, Zhi Ning CheAbstract:A grid-array antenna using a zero-phase-shift (ZPS) line is proposed to enlarge the Interrogation Zone of a reader antenna for near-field ultra-high-frequency (UHF) radio frequency identification (RFID) system. The proposed grid-array antenna is composed of a number of grid cells and a double-sided parallel-strip line feeding network. Each grid cell, namely segmented loop constructed by the ZPS line, has uniform and single-direction flowing current along the line. By configuration of the cells sharing a common side with its adjacent grid cells which carry reverse-direction flowing current, a grid-array antenna is formed to generate a strong and uniform magnetic-field distribution over a large Interrogation Zone even when the perimeter of the Interrogation Zone reaches up to 3λ (where λ is the operating wavelength in free space) or larger. As an example, a grid-array antenna with 1 × 2 segmented ZPS line loop cells implemented onto a piece of FR4 printed board (PCB) is designed and prototyped. The results show that the grid-array antenna achieves the impedance matching over the frequency range from 790 to 1040 MHz and produces strong and uniform magnetic-field distribution over an Interrogation Zone of 308 mm × 150 mm.
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electrically large dual loop antenna for uhf near field rfid reader
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Xianming Qing, Zhi Ning ChenAbstract:An electrically large dual-loop antenna is proposed for ultra high frequency (UHF) near-field radio frequency identification (RFID) readers. The proposed antenna is composed of a main loop and a parasitic loop wherein the loops are constructed using segmented lines with distributed capacitors. The parasitic loop enhances and uniforms the magnetic field distribution in the central portion of the larger main loop so that the perimeter of Interrogation Zone of the dual-loop antenna can be extended up to three operating wavelengths. The measurement shows that a dual-loop antenna prototype printed onto a piece of FR4 printed circuit board (PCB) achieves good impedance matching over the frequency range of 845-928 MHz and produces strong and uniform magnetic field distribution with an Interrogation Zone of 250 mm 250 mm. A parametric study is carried out to provide the guidelines for the antenna design.
Zhi Ning Chen - One of the best experts on this subject based on the ideXlab platform.
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UHF Near-Field RFID Antennas
2016Co-Authors: Qing Xianming, Xianming Qing, Zhi Ning ChenAbstract:ABSTRACT: Near-field radio frequency identification (RFID) technology has been traditionally used at low frequency (LF) and high frequency (HF) bands; now developing this technology at ultra high frequency (UHF) band is of increasingly interest. Designing a UHF near-field RFID reader antenna is one of the most challenging tasks. Traditional loop antennas cannot operate properly at the UHF band when the antennas tend electrically large so that they are unable to generate strong and uniform magnetic field in an adequate Interrogation Zone. A number of techniques have been presented to design UHF near-field RFID reader antennas, which enables the electrically large loop-type antenna generating desired magnetic field distribution. In this paper, the challenges of the UHF near-field antenna design are addressed. The state-of-art UHF near-field antenna techniques are reviewed and discussed
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enlargement of Interrogation Zone of zpsl loop antennas for uhf rfid systems
International Symposium on Antennas and Propagation, 2016Co-Authors: Yunjia Zeng, Xianming Qing, Zhi Ning Chen, Jianming JinAbstract:Zero-phase-shift line (ZPSL) loop antennas have recently attracted much interest by virtue of their uniform magnetic field distribution and electrically large size, which make them particularly useful as reader antennas in ultra-high frequency (UHF) near-field radio frequency identification (RFID) systems. Nevertheless, the challenge to theoretically characterize this type of antenna has led to difficulties in optimizing the loop for an electrically large Interrogation Zone as an RFID reader antenna. In this paper, we present for the first time the design methodology of the ZPSL loop antennas by applying the dispersion characteristics of the ZPSL structures. The perimeter of the loop antenna can be increased up to 3λ 0 without current reversal along the loop. Considering the tradeoff between the loop size and the strength of the magnetic field in the Interrogation Zone, a ZPSL loop prototype with a perimeter up to 2.5λ 0 is designed and optimized to verify the modeling and optimization experimentally.
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electrically large dual loop antenna for uhf near field rfid reader
IEEE Transactions on Antennas and Propagation, 2013Co-Authors: Xianming Qing, Zhi Ning ChenAbstract:An electrically large dual-loop antenna is proposed for ultra high frequency (UHF) near-field radio frequency identification (RFID) readers. The proposed antenna is composed of a main loop and a parasitic loop wherein the loops are constructed using segmented lines with distributed capacitors. The parasitic loop enhances and uniforms the magnetic field distribution in the central portion of the larger main loop so that the perimeter of Interrogation Zone of the dual-loop antenna can be extended up to three operating wavelengths. The measurement shows that a dual-loop antenna prototype printed onto a piece of FR4 printed circuit board (PCB) achieves good impedance matching over the frequency range of 845-928 MHz and produces strong and uniform magnetic field distribution with an Interrogation Zone of 250 mm 250 mm. A parametric study is carried out to provide the guidelines for the antenna design.
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uhf near field segmented loop antennas with enlarged Interrogation Zone
International Workshop on Antenna Technology, 2012Co-Authors: Xianming Qing, Zhi Ning ChenAbstract:Near-field radio frequency identification (RFID) technology at ultra high frequency (UHF) bands is of increasingly interest because of its promising opportunities in item-level RFID applications. The conventional single solid-line loop antenna is unable to generate strong and uniform magnetic field within an electrically large Interrogation Zone at the UHF bands. Segmented loop antennas are promising for UHF near-field RFID applications since they are able to generate uniform and strong magnetic field in an electrically larger Interrogation Zone. The reported segmented loop antennas have been able to offer an Interrogation Zone with a perimeter of around two operating wavelengths. In this paper, the segmented loop antennas with enlarged Interrogation Zone are presented. Using dual or multiple segmented loop configurations, the perimeters of the Interrogation Zone of the antennas can be larger than three operating wavelengths at the UHF bands.
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uhf near field rfid reader antenna with capacitive couplers
Electronics Letters, 2010Co-Authors: Xianming Qing, Zhi Ning Chen, C K GohAbstract:A segmented loop antenna with capacitive couplers is proposed for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications, which is capable of generating a strong and uniform magnetic field in a near-field Zone even though the perimeter of the loop is comparable to the operating wavelength. As an example, an antenna printed onto an FR4 printed circuit board with an Interrogation Zone of 154 × 154 mm exhibits good impedance matching and uniform magnetic field distribution over an operating bandwidth of 790-1000 MHz, which is desirable for UHF near-field RFID reader applications.
Enrique Onieva - One of the best experts on this subject based on the ideXlab platform.
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dynamic frame update policy for uhf rfid sensor tag collisions
Sensors, 2020Co-Authors: Laura Arjona, Hugo Landaluce, Asier Perallos, Enrique OnievaAbstract:The current growing demand for low-cost edge devices to bridge the physical-digital divide has triggered the growing scope of Radio Frequency Identification (RFID) technology research. Besides object identification, researchers have also examined the possibility of using RFID tags for low-power wireless sensing, localisation and activity inference. This paper focuses on passive UHF RFID sensing. An RFID system consists of a reader and various numbers of tags, which can incorporate different kinds of sensors. These sensor tags require fast anti-collision protocols to minimise the number of collisions with the other tags sharing the reader's Interrogation Zone. Therefore, RFID application developers must be mindful of anti-collision protocols. Dynamic Frame Slotted Aloha (DFSA) anti-collision protocols have been used extensively in the literature because EPCglobal Class 1 Generation 2 (EPC C1G2), which is the current communication protocol standard in RFID, employs this strategy. Protocols under this category are distinguished by their policy for updating the transmission frame size. This paper analyses the frame size update policy of DFSA strategies to survey and classify the main state-of-the-art of DFSA protocols according to their policy. Consequently, this paper proposes a novel policy to lower the time to read one sensor data packet compared to existing strategies. Next, the novel anti-collision protocol Fuzzy Frame Slotted Aloha (FFSA) is presented, which applies this novel DFSA policy. The results of our simulation confirm that FFSA significantly decreases the sensor tag read time for a wide range of tag populations when compared to earlier DFSA protocols thanks to the proposed frame size update policy.
Zhi Ning Che - One of the best experts on this subject based on the ideXlab platform.
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an artificial magnetic conductor backed electrically large zero phase shift line grid loop near field antenna
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yunjia Zeng, Zhi Ning Che, Xianming QingAbstract:A zero-phase-shift line (ZPSL) grid-loop antenna backed by an artificial magnetic conductor (AMC) is proposed to realize a uniform and strong magnetic field distribution over an electrically large Interrogation Zone for near-field wireless systems. The grid-loop configuration is able to achieve a uniform magnetic field distribution over an enlarged Interrogation Zone by enhancing the magnetic field in the central portion of the ZPSL loop. Moreover, an AMC comprised of four-arm spiral unit cells is designed to back the ZPSL grid-loop antenna for a directional field distribution and enhanced magnetic field intensity. The proposed antenna is exemplified as a reader antenna for ultrahigh frequency near-field radio frequency identification systems. By using an Impinj Speedway reader with an output power of 30 dBm, a 100% detection rate of Impinj J41 tags is achieved up to 90 mm over an Interrogation Zone of $200 \times 200$ mm2.
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electrically large zero phase shift line grid array uhf near field rfid reader antenna
IEEE Transactions on Antennas and Propagation, 2014Co-Authors: Ji Shi, Xianming Qing, Zhi Ning CheAbstract:A grid-array antenna using a zero-phase-shift (ZPS) line is proposed to enlarge the Interrogation Zone of a reader antenna for near-field ultra-high-frequency (UHF) radio frequency identification (RFID) system. The proposed grid-array antenna is composed of a number of grid cells and a double-sided parallel-strip line feeding network. Each grid cell, namely segmented loop constructed by the ZPS line, has uniform and single-direction flowing current along the line. By configuration of the cells sharing a common side with its adjacent grid cells which carry reverse-direction flowing current, a grid-array antenna is formed to generate a strong and uniform magnetic-field distribution over a large Interrogation Zone even when the perimeter of the Interrogation Zone reaches up to 3λ (where λ is the operating wavelength in free space) or larger. As an example, a grid-array antenna with 1 × 2 segmented ZPS line loop cells implemented onto a piece of FR4 printed board (PCB) is designed and prototyped. The results show that the grid-array antenna achieves the impedance matching over the frequency range from 790 to 1040 MHz and produces strong and uniform magnetic-field distribution over an Interrogation Zone of 308 mm × 150 mm.
W Kalita - One of the best experts on this subject based on the ideXlab platform.
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modelling and design of hf rfid passive transponders with additional energy harvester
International Journal of Antennas and Propagation, 2013Co-Authors: P Jankowskimihulowicz, W Kalita, M Skoczylas, M WeglarskiAbstract:The huge progress in electronics technology and RFID technique gives the opportunity to implement additional features in transponders. It should be noted that either passive or semipassive transponders are supplied with energy that is derived from the electromagnetic field generated by the read/write device and its antenna. This power source is used to conduct radio-communication process and excess energy could be used to power the extra electronic circuits, but the problem is to determine the additional power load impact on the RFID system proper operation and size of Interrogation Zone. The ability to power the supplementary electronic blocks applied in the HF passive transponders is discussed in detail this paper. The simulation model and test samples with a harvester that recovers energy from the electromagnetic field of read/write device and its antenna have been developed in order to conduct investigations. The harvested energy has been utilized to supply a microprocessor acquisition block for LTCC pressure sensor developed in research previously described by authors.
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application of monte carlo method for determining the Interrogation Zone in anticollision radio frequency identification systems
2011Co-Authors: Piotr Jankowskimihulowicz, W KalitaAbstract:Current problems that occur in the field of anticollision Radio Frequency IDentification (RFID) prototype systems are solved in experimental way (De Blasi et al., 2010; Lehto et al., 2009; Polivka et al., 2009; Brown, 2007; Clarke et al., 2006; Penttila et al., 2006; Jones & Chung, 2007). The low efficiency coefficient of identification for the multiple objects localized in the space ΩID doesn't allow to realize practical projects, such as, the identification of Fast Moving Consumer Goods (FMCG) – Fig. 1. In the light of nascent and modified legal communications standards, like for example, Electronic Product Code (EPC) in the area of UHF and HF ISO 18000-6, ISO 15693, ISO 18000-3 normalizations, there is a necessity to continue complex theoretical research and experimental investigations in the range of simultaneous analysis of EM field, communication protocols, and electric aspects of operating conditions of efficiency identification in anticollision RFID systems.
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problem of dynamic change of tags location in anticollision rfid systems
Microelectronics Reliability, 2008Co-Authors: P Jankowskimihulowicz, W Kalita, Bartosz PawlowiczAbstract:Abstract Presently the necessity of building anticollision RFID systems with dynamic location change of tags appear more often. Such solutions are used in identification of moving cars, trains (automatic identification of vehicles – AVI processes) as well as moving parts and elements in industry, commerce, science and medicine (internet of things). In the paper there were presented operation stages in the RFID anticollision system necessary to communicate with groups of tags entering and leaving read/write device Interrogation Zone and communication phases in conditions of dynamic location change of tags. The mentioned aspects influence RFID system reliability, which is characterized by the efficiency coefficient and the identification probability of objects in specific Interrogation Zone. The communication conditions of correct operation of multiple RFID system are crucial for efficient exchange of data with all tags during their dynamic location changes. Presented problem will be the base to specify new application tag parameters (such as maximum speed of tag motion) and synthesis of Interrogation Zone required for concrete anticollision RFID applications with dynamic location change of tags.
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problem of Interrogation Zone synthesis in anticollision radio frequency identification systems
International Spring Seminar on Electronics Technology, 2008Co-Authors: Piotr Jankowskimihulowicz, W KalitaAbstract:The need for designing anticollision radio frequency identification (RFID) systems appears more often. The typical applications of such systems are concentrated on different economic and public activity in industry, commerce, science and medicine (Internet of things). Operation of passive RFID systems (low or high frequency inductive coupled, ultra high frequency) is characterized by the Interrogation Zone, which is estimated in any direction of 3D space for group of electronic tags. The comprehensive algorithm of identification of Interrogation Zone for inductive coupled anticollision RFID system taking into consideration the field, electrical and communication aspects of operation conditions has been partially presented in this paper. The mentioned aspects influence on RFID system reliability, which is characterized by the efficiency coefficient and the probability of identification of the objects in determined Interrogation Zone. Presented electromagnetic field and electric aspects of operation conditions of identification efficiency in anticollision RFID systems are the part of the algorithm of synthesis of RWD and tag antenna set for the system with inductive coupling. It defines the energy transfer and the conditions of passive tag supply, which expresses the elementary tag parameter defining the Interrogation Zone - the minimum value of magnetic induction.
