Near-field antenna for a radio frequency identification shelf in the UHF band

Choi, Wooseon; Kim, J.-s.; Bae, Ji‐Hoon; Choi, Gil‐Young; Chae, Jong-Suk

doi:10.1049/iet-map.2009.0203

Cited by 15 publications

(11 citation statements)

References 4 publications

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“…In particular, the magnetic field could be reasonably considered as the key-parameter to be maximized in order to improve the detection of loop-or spiral-like tags (inductive coupling), as in [10] and [11]. Similarly, in [2], [4], and [9], the electric field distribution is taken into account since it is related to the detection of dipole-like tags (capacitive coupling). Despite this, several commercial UHF RFID tags are characterized by a hybrid layout, and they cannot be considered electrically small (i.e., their size is not lower than ).…”

Section: IImentioning

confidence: 99%

“…Since in NF applications the tag detection has to be limited within an assigned confined volume close to the antenna surface, a proper reader antenna design is required. A number of solutions for NF UHF-RFID reader antennas have been proposed, such as arrays of patches [2], strips [2], or slots [4] at UHF and microwaves (e.g., 2.4 GHz) frequency bands. Segmented loop antennas [5]- [8] have been proposed to get an almost constant current distribution in a physically large loop, where contiguous loop segments are connected by lumped [5] or distributed [6]- [8] capacitive elements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

UHF-RFID Desktop Reader Antennas: Performance Analysis in the Near-Field Region

Michel

Nepa

2016

Antennas Wirel. Propag. Lett.

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In this letter, a metric is proposed to qualitatively predict the achievable reading performance of a near-field (NF) UHF-RFID (865-928 MHz) desktop reader antenna, through a numerical analysis. Specifically, since the typical far-field antenna parameters (gain, radiation pattern, axial ratio) are not effective in the near-field region, the normalized power density is here proposed as a near-field antenna performance parameter. For a given NF antenna, the mean value of the normalized power density is evaluated on an area parallel to the antenna surface, at a set of different distances. Then, its decay rate is studied as a function of the distance from the antenna surface, which is useful to compare reading range performance of different antenna layouts. Additionally, the probability density function of the normalized power density at a given distance from the antenna surface is considered to investigate the field uniformity characteristics, the latter being important to guarantee tag reading independently on its location with respect to the reader antenna. The proposed analysis is applied to a set of NF UHF-RFID printed antennas, and conclusions are validated through a set of experimental tests. Index Terms-Near-field antenna characterization, near-field coupling, near-field UHF-RFID systems, UHF-RFID reader antenna. I.

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Section: IImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

UHF-RFID Desktop Reader Antennas: Performance Analysis in the Near-Field Region

Michel

Nepa

2016

Antennas Wirel. Propag. Lett.

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“…A maximum range of 30 cm using standard UHF RFID tags (10 × 1 cm²) is obtained. Another antenna based on the same technique [20] is composed of a micro-strip line, which excites a set of slots to enhance the electric field in a specific space region. This antenna has a reading area of 40 × 32 cm² and a maximum range of 3 cm for tag sizes of 3 × 3 cm².…”

Section: Introductionmentioning

confidence: 99%

Near-Field Modular Antenna Concept With Configurable Reading Area for RFID Applications

Daiki

Perret

2017

IEEE Trans. Antennas Propagat.

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This paper presents a near-field antenna with significant reading area that is reconfigurable. This antenna is used to realize near-field UHF RIFD reader. The antenna is printed on a flexible plastic substrate and then cut to the desired dimensions to be positioned over the area where it is desired to carry out the reading of near-field UHF RFID tags. This new concept of configurable antenna on demand, which is cut to fix the reading zone, shows extremely modular characteristics and can be simply implanted in a real environment. The performances of different configurations of the antenna that tell about different reading surfaces are presented. Significant reading surfaces never obtained before for near-field UHF RFID tags (1×1 cm²) up to 42 × 76 cm² with a minimum range of 15 cm for the 868 MHz band are reported. Reading areas in three dimensions of such antennas are characterized experimentally with commercial tags to confirm the performances in a real environment.

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“…Specific requirements for the embedded into the shelf R/W antennas are the ability to cover the customsized, and often varying, tag interrogation volumes as well as planar and low-cost design layout. Recent solutions reported in the literature are straight and meandered microstrip (MS) loaded line [1], an asymmetrical meandered coplanar waveguide line [2], and MS structure with slotted ground plane [3]. All these smart shelf antennas produce the read range limited to 10 cm or less from the antenna surface and are able to detect the UHF tags oriented in a certain direction.…”

Section: Introductionmentioning

confidence: 99%

Novel design of UHF RFID near-field antenna for smart shelf applications

Andrenko

Masuda

2013

2013 Asia-Pacific Microwave Conference Proceedings (APMC)

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This paper presents the design of UHF RFID read/write (R/W) antenna to be used in a variety of smart shelf retail applications. The design principle based on the EM coupling between open-ended MS feed line and periodic planar metal strips is presented. The proposed antenna can be easily customized for the required aria of smart shelf RFID interrogation. Several antenna prototypes have been designed, produced and measured. The antenna performance has been evaluated in UHF RFID system for the simultaneous detection of arbitrary oriented tagged apparel items placed on the antenna surface. The proposed antenna demonstrates excellent ability to provide strong and uniform E-field distribution at the distances up to 50 cm form the antenna surface.Index Terms -UHF RFID, near-field antenna, EM coupling, standing wave, read range.

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Near-field antenna for a radio frequency identification shelf in the UHF band

Cited by 15 publications

References 4 publications

UHF-RFID Desktop Reader Antennas: Performance Analysis in the Near-Field Region

UHF-RFID Desktop Reader Antennas: Performance Analysis in the Near-Field Region

Near-Field Modular Antenna Concept With Configurable Reading Area for RFID Applications

Novel design of UHF RFID near-field antenna for smart shelf applications

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