Broadband RFID tag antenna with capacitively coupled structure

Chang, Chia Chen; Lo, Yew Chiong

doi:10.1049/el:20062063

Cited by 33 publications

(10 citation statements)

References 3 publications

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“…Selection of designed tag antenna with good characteristics for the UHF and microwave RFID system is a very important project. Dipole-type and patch-type designed antennas made RFID tag antenna main used and modified pliable shape for person customization [2][3][4][5]. The dipole antenna for RFID tag is good candidate owing to their omnidirectional radiation pattern, simple structure, low cost, and ease of construction.…”

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confidence: 99%

A fractal dipole tag antenna for RFID dual‐band application

Lee

Sun

2008

Micro & Optical Tech Letters

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Results obtained for these two methods are good in track. Based on this point, RBFNN model can provide automatic estimation of local SAR values in the working frequency values and requires coordinate location for each layer. This simulation was realized for three-layer cylindrical human model; however, this method can be easily used for different structures.Variation of maximum error levels which occur in the output of the network is shown in Figure 5. We have reached to these values by choosing maximum values between RBFNN results and FDTD results for each frequency in test step. Accuracy levels of the network changed with using different frequency values. In the designed model, the error level can be reduced by using an optimum sigma (width of the Gauss Kernel function) value. The variations are given in Figures 4 and 5 for ϭ 50.The test accuracy of RBFNN changes depending on the sigma parameter. The variation of maximum error values which is calculated for all frequency values in the test data with respect to sigma parameter is shown in Figure 6. The sigma is an effective parameter for the performance of network. The determination of optimum sigma values is important for the accuracy of the system. In this work, Gaussian Kernel width was determined experimentally for maximum performance. CONCLUSIONIn this study, a new approach based on RBFNN was presented for the estimation of local SAR values for the three-layer cylindrical human model. The target data were determined with FDTD solution, which was used to determine the local SAR, when a plane wave hits the PML-surrounded three-layer cylinder. The results show that RBFNN is an effective model for this problem space, and RBFNN design solutions are well matched with the FDTD solution results. This method was proposed for the three-layer cylindrical human model; however, this topology can be applied for different structures. ACKNOWLEDGMENTThis research has been supported by the Research Project Department of Akdeniz University, Antalya, Turkey. Hot embossing, also known as nano-imprinting, is an emerging lithographic technology that promises high-throughput patterning of micro-and nano-scale structures [4 -6]. We have previously shown [7,8] that hot embossing can be used to define micron-scale patterns, with submicron definition, in bulk chalcogenide glass substrates and in chalcogenide glass thin-films sputtered onto semiconductor wafer substrates. In this letter, we describe the realization of single-mode optical rib waveguides in chalcogenide glasses by a new one-step process, where As 40 Se 60 fibers are hot-pressed between a silicon mold (patterned with the inverse of the required rib structures) and a Ge 17 As 18 Se 65 glass substrate. In this approach, both the thin film and rib structures are defined together, so avoiding the need for a separate thin film deposition step. CORE/CLADDING MATERIAL SELECTION AND PREPARATIONTo fabricate hot-embossed chalcogenide glass waveguides, the chosen core/cladding materials must have suitable refractive indices, matched...

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A fractal dipole tag antenna for RFID dual‐band application

Lee

Sun

2008

Micro & Optical Tech Letters

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“…Cho et al [8] illustrates a tag with a 8.5% bandwidth, but the dimensions were found using genetic algorithms and thus provide little insight. Chang and Lo [9] show how to use a capacitively loaded matching circuit to achieve broadband behavior, but provide no theoretical analysis.…”

Section: Bandwidthmentioning

confidence: 99%

Analysis and design of wideband passive UHF RFID tags using a circuit model

Deavours

2009

2009 IEEE International Conference on RFID

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The great majority of commercial UHF RFID tags are based on dipole antennas using a modification of a Tmatch as a matching circuit. The literature contains examples of wideband matching, but provides little insight as to how wideband behavior is achieved. Here, we present a simple circuit-based theory to describe the antenna, matching circuit, and IC behavior; we present an approach for developing an impeding matching strategy to maximize bandwidth; and we present a concrete example and analysis using a method of moments (MoM) numerical solver. The results show very good agreement with theory.

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“…Besides, the design of the impedance matching between the tag antenna and the chip is crucial to the performance of the RFID tag antennas. Several papers have been published on the impedance matching techniques, for example, slot structure [5], T-matching structure [6], and inductively/capacitively coupled structure [7,8]. In this paper, a novel structure is proposed for a small-sized UHF tag antenna composed of a first-order Hilbert fractal structure and a spiral structure for a quasi-isotropic radiation pattern and a T-matching structure for a broadband impedance matching with a tag chip.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Design of Uhf Fractal Rfid Tag Antenna

Shi¹,

Fang²,

Kang³

et al. 2016

PIER Letters

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Abstract-In this paper a broadband radio frequency identification (RFID) tag antenna for the ultrahigh-frequency (UHF) band is designed. The proposed antenna consists of a first-order Hilbert fractal structure and a spiral structure. In order to ensure the conjugate matching between the tag antenna and the electronic chip, a T-matching structure is employed. The interaction between two radiating elements makes the proposed antenna a fractional bandwidth of 20% over the frequency range of 820 MHz-1010 MHz and a small size of 0.2092λ 0 × 0.099λ 0 . Simulated and measured results validate the good performance of the designed tag antenna.

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Broadband RFID tag antenna with capacitively coupled structure

Cited by 33 publications

References 3 publications

A fractal dipole tag antenna for RFID dual‐band application

A fractal dipole tag antenna for RFID dual‐band application

Analysis and design of wideband passive UHF RFID tags using a circuit model

A Broadband Design of Uhf Fractal Rfid Tag Antenna

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