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Proceedings ArticleDOI

Metamaterial RFID tag designs for long read range

TL;DR: In this paper, a novel high gain metamaterial tag antenna for European UHF RFID was proposed, where a modified dog bone AMC unit cell and a meander dipole antenna are designed separately to operate in 865.6-867.6 MHz frequency band, then the effect of adding an AMC to design is investigated.
Abstract: A novel high gain metamaterial tag antenna for European UHF RFID is proposed. First a modified dog bone AMC unit cell and a meander dipole antenna are designed separately to operate in 865.6–867.6 MHz frequency band, then the effect of adding an AMC to design is investigated. The realized gain increased from 1.8 dB for the antenna alone to 4.17 dB for the metamaterial antenna constituted of 1 × 2 unit cells. A total efficiency of 90 % is observed at 868 MHz. Then the effect of increasing the number of unit cells of AMC on the performance of the tag antenna in terms of gain, bandwidth and radiation efficiency is studied. By increasing the unit cells to 2×3, the antenna gain increases to 7.66 dB with an efficiency of 95.78 %, hence increasing the read range. The structure is low cost and easy to fabricate.
Citations
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Journal ArticleDOI
TL;DR: This letter provides a miniature antenna for the RFID tag for identifying patients in African and European hospitals and shows good performance in terms of miniaturization, bandwidth, impedance matching and, reading distance.
Abstract: The development of miniature antennas for bio-medical applications has attracted the attention of many researchers in the last years. In this letter, we provide a miniature antenna for the RFID tag for identifying patients in African and European hospitals. The proposed antenna is designed on a flexible silicon substrate with a relative dielectric constant of 11.9 and a thickness of 1.6mm. An in-depth study of the proposed wearable antenna was made in free space and on human tissue. The achieved results showed good performance in terms of miniaturization, bandwidth, impedance matching and, reading distance. The presented tag antenna is designed and simulated by using CST-MWS solver and the results were validated by HFSS and both results are in good agreement.

13 citations


Cites background from "Metamaterial RFID tag designs for l..."

  • ...After this work, the metamaterials have had a great following by researchers in many fields and especially in the microwave field [19-20]....

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Journal ArticleDOI
TL;DR: Simulation results have confirmed that proposed Miller encoder offers a simpler design with reduced transistor count and gives lower power dissipation, higher frequency range of operation at lower supply rail as compared to other candidate designs.
Abstract: This paper proposes a T-flip-flop and a Miller encoder design for ultra-high frequency and super high frequency, radio-frequency identification (RFID) application using FinFETs. Miller encoder is u...

8 citations

Journal ArticleDOI

6 citations


Cites background from "Metamaterial RFID tag designs for l..."

  • ...It provides an output power of 5–31.5 dBm at the operating frequency of 865–868 MHz....

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  • ...The minimum power obtained is 6.33 dBm for the tag alone and 4.5 dBm for the tag with metallic sheet, at the frequency of 870 MHz instead of 868 MHz....

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  • ...A frequency shift of about 2 MHz is also observed, which could be explained after performing retro-simulation, a dielectric constant of 3.49 should be used instead of 3.55....

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  • ...When varying the signal frequency, the minimum power Pmin required to activate the tag was picked up at different frequencies in the 840–960 MHz band....

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  • ...[1], several via-less AMC structures, based on two different substrates were proposed....

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Journal ArticleDOI
TL;DR: In this paper, a dipole antenna with Spiral Split Ring Resonators (SSRR) is proposed for RFID reader, this novel miniaturized metamaterials is characterized by a very small size compared to the classical resonator introduced by J. Pendry, then constituting of a negative permeability (µeff) around the resonance frequency.
Abstract: In this paper, a dipole antenna with Spiral Split Ring Resonators (SSRR) for RFID reader is proposed, this novel miniaturized metamaterials is characterized by a very small size compared to the classical resonator introduced by J. Pendry, then by the constituting of a negative permeability (µeff) around the resonance frequency. The dipole antenna based on metamaterials is proposed to increase the performance (Directivity, Gain and bandwidth) and reducing the dimensions of RFID reader antennas that operate in the SHF band (2.4-2.485GHz).

2 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented a new design of dual-band antenna for RFID reader applications operating at 2.45Gz and 5.8GHz with an average gain of 1.16dB at the lower frequency band and 3.2dB at higher frequency band.
Abstract: Radio frequency identification is being overloaded with data information, making wideband band antennas very appealing. In this paper, we present a new design of dual band antenna for RFID reader applications operating at 2.45Gz and 5.8GHz with an average gain of 1.16dB at the lower frequency band and 3.2dB at the higher frequency band. The antenna is designed on an FR-4 substrate having a relative dielectric constant of 4.4 and loss tangent of 0.025. The proposed antenna is simulated, designed and, optimized using CST Microwave Studio and has a small size of 32 mm x 26 mm x 1.6 mm. The antenna consists of a steeped rectangular patch antenna using a partial ground plane loaded a modified split ring resonator. The metamaterial structure was designed and optimized to operate at 2.45GHz and its effective parameters was verified using the Nicolson-Ross Weir method. The performance of the proposed antenna is confirmed by another 3D electromagnetic solver HFSS.

2 citations

References
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Book
24 Nov 2008
TL;DR: In this paper, the FDTD method for periodic structure analysis is used for periodic structures analysis of EBG surfaces and low profile wire antennas are used for EBG surface wave antennas.
Abstract: Preface 1. Introduction 2. FDTD Method for periodic structure analysis 3. EBG Characterizations and classifications 4. Design and optimizations of EBG structures 5. Patch antennas with EBG structures 6. Low profile wire antennas on EBG surfaces 7. Surface wave antennas Appendix: EBG literature review.

634 citations


"Metamaterial RFID tag designs for l..." refers background in this paper

  • ...Another solution to prevent the degradation of the dipole tag antenna performances caused by the conductive materials and to increase the gain of the antenna, is to incorporate an artificial magnetic conductor (AMC) structure behind the antenna to create an almost in-phase reflection of the incident wave [7]....

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Journal ArticleDOI
TL;DR: In this paper, a dual-band passive radio frequency identification (RFID) tag antenna was proposed by using an artificial magnetic conductor (AMC) ground plane for European (869.5 869.7 MHz) and Korean (910 914 MHz) passive UHF RFID bands by replacing the bottom side of the metallic cavity of a PEC-like behavior.
Abstract: A dual-band passive radio frequency identification (RFID) tag antenna applicable for a recessed cavity in metallic objects such as heavy equipment, vehicles, aircraft, and containers with long read range is proposed by using an artificial magnetic conductor (AMC) ground plane. The proposed tag antenna consists of a bowtie antenna and a recessed cavity with the AMC ground plane installed on the bottom side of the cavity. The AMC ground plane is utilized to provide dual-band operation at European (869.5 869.7 MHz) and Korean (910 914 MHz) passive UHF RFID bands by replacing the bottom side of the metallic cavity of a PEC-like behavior and, therefore, changing the reflection phase of the ground plane. It is worthwhile to mention that the European and the Korean UHF RFID bands are allocated very closely, and the frequency separation ratio between the two bands is just about 0.045, which is very small. It is demonstrated by experiment that the maximum reading distance of the proposed tag antenna with optimized dimensions can be improved more than 3.1 times at the two RFID bands compared to a commercial RFID tag.

84 citations


"Metamaterial RFID tag designs for l..." refers background in this paper

  • ...Usually these are based on printed dipole and monopole antennas [1-5]....

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  • ...Most of AMC structures proposed in the literature are applied to antennas and few are the ones dealing with tag antennas, which are quite costly and difficult to fabricate [1], [3-5]....

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Journal ArticleDOI
TL;DR: In this article, a low profile (aplambda/100) passive radio frequency identification (RFID) tag antenna incorporated with a compact artificial magnetic conductor (AMC) substrate is proposed.
Abstract: A low-profile (aplambda/100) passive radio frequency identification (RFID) tag antenna incorporated with a compact artificial magnetic conductor (AMC) substrate is proposed. A novel modified rectangular patch type AMC substrate with offset vias is employed to significantly reduce the planar dimensions of a tag antenna, which is about 0.1lambda times 0.2lambda. The effect of a ground plane size and the number of AMC unit cells on the antenna performance such as return loss and gain is investigated with a view of tag installation. It is demonstrated through experiments that the proposed tag antenna shows relatively tolerant reading distances from 2.4 to 4.8 m under various platform environments such as a conductive plate or a plastic water container.

78 citations

Journal ArticleDOI
TL;DR: In this paper, a passive RFID tag antenna in a recessed cavity in metallic objects such as vehicles, air craft, and metallic containers, and an impedance matching technique for this configuration is proposed.
Abstract: A passive RFID tag antenna in a recessed cavity in metallic objects such as vehicles, air craft, and metallic containers, and an impedance matching technique for this configuration are proposed. The proposed tag antenna can be considered as a cavity-backed antenna and it is comprised of a bowtie antenna installed in a recessed cubic volume in a large metallic object, and the input impedance of the bowtie antenna can be easily matched by adjusting the coupling effect between the tag antenna and the cavity. Main parameters affecting the coupling are the dimensions of the cavity and the location of the bowtie antenna inside the cavity. For more practical analysis of the impedance matching process, an equivalent-circuit model consisting of several lumped elements is introduced and each element is optimized using a genetic algorithm (GA). Experimental results show that the maximum reading distance of the proposed tag antenna with optimized dimensions can be improved about 3.2 times compared to a commercial RFID tag.

52 citations


"Metamaterial RFID tag designs for l..." refers background in this paper

  • ...Usually these are based on printed dipole and monopole antennas [1-5]....

    [...]

Journal ArticleDOI
TL;DR: In this article, a passive radio frequency identification (RFID) tag antenna providing a long recognition distance is proposed, which is mountable on various types of platforms including metallic and highly dielectric objects.
Abstract: A passive radio frequency identification (RFID) tag antenna providing a long recognition distance is proposed, which is mountable on various types of platforms including metallic and highly dielectric objects. To increase the reading distance, the antenna is installed in a recessed metallic cavity. To reduce further the height of the antenna, an artificial magnetic conductor is placed on the bottom face of the cavity. Consequently, the tag antenna not only can be miniaturised, but also can provide long reading distances on any type of platform objects. The measured maximum reading distance and the minimum sensitivity are 12.2 m and −17 dBm, under a reader transmitting 30 dBm with a 6 dBi antenna. Good agreement between the prediction and experimental results verifies that the approach is fairly effective and useful to substantially increase the reading distance.

40 citations


"Metamaterial RFID tag designs for l..." refers background in this paper

  • ...Usually these are based on printed dipole and monopole antennas [1-5]....

    [...]

  • ...Most of AMC structures proposed in the literature are applied to antennas and few are the ones dealing with tag antennas, which are quite costly and difficult to fabricate [1], [3-5]....

    [...]