An Analytic Model for Impedance Calculation of an RFID Metal Tag

Kuo, Shih-Kang; Liao, Long-Gee

doi:10.1109/lawp.2010.2053511

Cited by 23 publications

(9 citation statements)

References 8 publications

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“…It decays to 2.1 m when the plate size is reduced to 9 cm. The calculated antenna efficiency is around 10%, while the efficiency is 45% for another metal tag design with more extensive reading range over 6 meters [17]. The degraded antenna efficiency is primarily due to the lossy characteristics of the absorber, which dissipates a portion of the energy by its nonzero imaginary material constants.…”

Section: Reading Range Testmentioning

confidence: 94%

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Analysis and Design of an Uhf Rfid Metal Tag Using Magnetic Composite Material as Substrate

Kuo¹,

Hsu²,

Hung³

2010

PIER B

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Abstract-Using magnetic composite material as the substrate for RFID metal tag has several advantages over conventional metal tags, such as flexibility and miniaturized size. In this paper, the radiation intensity contributed by a half-wave dipole is derived based on the result of an ideal Hertzian dipole, which leads to a simple relation for thin substrate. Later on, the material constants of two materials are measured and the one capable of generating greater radiation intensity is used in the course of antenna design. A primitive pattern design demonstrates the metal tag has a satisfactory 2.7 m reading range, and a dimension of 80 × 22 × 2 mm 3 .

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Section: Reading Range Testmentioning

confidence: 94%

“…A very attractive feature offered by the absorber based metal tag is its wide bandwidth. The most infamous feature of the low profile UHF metal tags is their narrow bandwidth, which usually ranges from 15 to 25 MHz [17]. Patch antennas using substrates loaded with magnetic films are known to have larger bandwidth [18,19].…”

Section: Adding Matching Networkmentioning

confidence: 99%

Analysis and Design of an Uhf Rfid Metal Tag Using Magnetic Composite Material as Substrate

Kuo¹,

Hsu²,

Hung³

2010

PIER B

Self Cite

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“…The design issues are limited by the fixed loop dimensions and the coupling trimming is based only on the distance between the module and the antenna. A more sophisticated matching network using a direct chip connexion [2] or a large printed coupling loop [11] allows higher coupling intensity and bandwidth. Nevertheless, the commercial strategy behind the use of the MuTRAK module, i.e.…”

Section: Fig 2 Tag Topology With and Without Mutrak Modulementioning

confidence: 99%

Metal mount RFID tag antenna excited by integrated loop/IC module

Quiroz¹,

Laheurte²

2013

Electron. lett.

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A simple topology is described for radio frequency identification (RFID) tags mountable on metal surfaces. The tag is built around a commercial UHF RFID module combining an IC and a coupling loop. The module is placed in the neighbourhood of a slot which is used both to couple the energy from the module to the patch-like antenna and to miniaturise the tag. A read range of almost 4 m is obtained in the 865-868 MHz band with a 1.6 mm low-cost FR4 substrate.Introduction: There is strong interest from many industries in tagging metal items (airplane or automotive parts, metal containers, shelves, pipes etc.) with the UHF RFID technology. The thicknesses of the published designs vary from 170 μm [1] to 1 cm [2] and even more. For the tracking of large high value assets, relatively bulky tags are acceptable to guarantee the required performance and thick antennas ( > 3 mm) can protrude from the mounting surface [2]. Ultra-low-profile metal tags whose thicknesses fall into the sub-mm range (down to 200 μm) are required for flat items to achieve an aesthetic integration (e.g. the thickness of the latest Apple MacBook Air is 3 mm), but only when short read ranges ( < 1 m) are acceptable [1,3]. Antenna thicknesses about 1-2 mm also find applications in numerous use cases, for instance when the tags should be curved for mounting on metallic cylinders (e.g. gas tanks and fire extinguishers) while providing medium to long read ranges (from 3 to 9 m) depending on the substrate characteristics [4,5].The read range degradation is inescapable when the tags are placed above large metallic surfaces especially for small antenna thicknesses. This flows from the simultaneous drop of the antenna efficiency and detuning of its input impedance due to the high parasitic capacitance between the metallic surface and the antenna. Apart from effective multiple folded dipole [6] configurations, most solutions are based on patch type or inverted-F type designs. These antennas use shorting-pins or shorting-walls. It makes their fabrication cost higher than that of normal label-type antennas and excludes them from low-cost mass production with inexpensive materials. In this Letter, we propose a simple design for a cost-effective metal tag dedicated to medium reading distances (up to 4 m) working in the European band (865)(866)(867)(868). This tag uses a module combining a loop excitation and an RFID chip. Performances are competitive with published designs of mid-range tags built on FR4 for equivalent antenna volumes and chip sensitivity, but without shorting points.

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“…Besides, some requirements in commercially should be taken into account in design process, such as the size of the antenna, sensitive read range, manufacturing cost, and impedance matching [8,9]. Based on the above considerations, several designs have been developed [10][11][12][13][14]. However, the size of the tag antenna in these designs is not small or thin enough, e.g., 118×43×1.5 mm 3 in [10].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the above considerations, several designs have been developed [10][11][12][13][14]. However, the size of the tag antenna in these designs is not small or thin enough, e.g., 118×43×1.5 mm 3 in [10]. A circular shape tag with highpermittivity ceramic (BaTiO 3 ) structure has been proposed in [11], and its diameter and thickness are 27.5 mm and 2.75 mm, respectively.…”

Section: Introductionmentioning

confidence: 99%

A Slim Wideband and Conformal Uhf Rfid Tag Antenna Based on U-Shaped Slots for Metallic Objects

2013

PIER C

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Abstract-A slim wideband patch antenna designed for the ultrahigh frequency (UHF) band radio frequency identification (RFID) tag is presented in this paper, which can be mounted on flat or curved metallic surfaces directly. The presented antenna is fabricated on a very thin (only 0.5 mm) and low-cost PET substrate (ε r = 3.8, tan δ = 0.02). The proposed design consists of tow coplanar patches radiation unities which are electrically connected to the metallic ground through two symmetrical shorting walls placed at both edge sides of the patches. Double symmetrical U-shaped slots are etched out to improve the antenna bandwidth. A perfect matching between antenna and tag chip can be easily obtained by varying the geometry parameters of the slots. The simulated bandwidth is about 97 MHz, which covers the Europe and North America UHF RFID frequency range. The measured maximum reading range of the proposed antenna can be up to 5 m when the tag is mounted on a metal plate whose size is 150 × 150 × 8 mm 3 .

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An Analytic Model for Impedance Calculation of an RFID Metal Tag

Cited by 23 publications

References 8 publications

Analysis and Design of an Uhf Rfid Metal Tag Using Magnetic Composite Material as Substrate

Analysis and Design of an Uhf Rfid Metal Tag Using Magnetic Composite Material as Substrate

Metal mount RFID tag antenna excited by integrated loop/IC module

A Slim Wideband and Conformal Uhf Rfid Tag Antenna Based on U-Shaped Slots for Metallic Objects

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