Power reflection coefficient analysis for complex impedances in RFID tag design

Никитин, П.В.; Rao, K. V.; Lam, S.F.; Pillai, V.; Martínez, Regina; Heinrich, H.

doi:10.1109/tmtt.2005.854191

Cited by 289 publications

(114 citation statements)

References 4 publications

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“…P Γ calculated according to (2) is plotted in Fig. 5A while an equivalent Smith chart, mapping the modified impedance as mentioned by Kurokawa 45 and used in passive RFID design, 46 is presented in Fig. S3.…”

Section: Power Reflection and Total Efficiencymentioning

confidence: 99%

Impedance Matching and Emission Properties of Nanoantennas in an Optical Nanocircuit

et al. 2009

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An experimentally realizable prototype nanophotonic circuit consisting of a receiving and an emitting nano antenna connected by a two-wire optical transmission line is studied using finite-difference time-and frequency-domain simulations. To optimize the coupling between nanophotonic circuit elements we apply impedance matching concepts in analogy to radio frequency technology. We show that the degree of impedance matching, and in particular the impedance of the transmitting nano antenna, can be inferred from the experimentally accessible standing wave pattern on the transmission line. We demonstrate the possibility of matching the nano antenna impedance to the transmission line characteristic impedance by variations of the antenna length and width realizable by modern microfabrication techniques. The radiation efficiency of the transmitting antenna also depends on its geometry but is independent of the degree of impedance matching. Our systems approach to nanophotonics provides the basis for realizing general nanophotonic circuits and a large variety of derived novel devices. 3 IntroductionMiniaturization and packaging density of integrated optics based on dielectrics is limited by the wavelength scale modal profiles of guided modes. 1 In contrast, plasmonic modes on noble metal nanostructures offer strong subwavelength confinement and therefore promise the realization of nanometer-scale integrated optical circuitry. 2,3 A truly subwavelength integrated photonic circuit based on plasmonic nano structures will generally consist of (i) a set of optical antennas 4,5,6,7 to efficiently excite specific local modes by far-field radiation, (ii) a very small footprint network of optical transmission lines 8 (OTLs) to distribute and manipulate plasmonic excitations, 9,10,11,12,13,14,15,16 and (iii) another set of optical antennas to efficiently convert local modes into propagating photons. The properties of metal nanoparticle chains, 17,18 metal nanowires, 19,20 line defects in plasmonic photonic crystals, 21 as well as gaps 22,23,24, and v-shaped grooves 9,25,26 in extended metal films have been explored as subwavelength waveguides for light.Efficient launching of specific guided modes on such structures is difficult since it requires matching of both, the small mode extension and the k-vector. It has been shown recently that efficient coupling between far-field photons and subwavelength spatial domains can be achieved using resonant optical antennas. 5,7,27,28,29,30,31 However, so far optical antennas have mostly been studied as isolated elements. Here we consider optical antennas as integral parts of an experimentally realizable integrated nanophotonic circuit where they act as efficient interfacing elements between propagating photons and guided modes of a plasmonic two-wire transmission line. We show by simulations that the principles of classical transmission line theory, e.g. impedance matching, 32 between the two-wire OTL and dipole antennas are fully applicable at optical frequencies. We further suggest tha...

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Section: Power Reflection and Total Efficiencymentioning

confidence: 99%

Impedance Matching and Emission Properties of Nanoantennas in an Optical Nanocircuit

et al. 2009

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“…In addition to the impedance analysis, the power reflection coefficient (PRC) [19] or power transmission coefficient (PTC, PTC=1-PRC) value is yet another important performance indicator. Therefore, the PTC curve which calculated from the PTC equation with antenna impedance and RFID chip impedance is shown in Figure 13.…”

Section: Figure 10mentioning

confidence: 99%

A Metallic Rfid Tag Design for Steel-Bar and Wire-Rod Management Application in the Steel Industry

Chen¹,

Kuo²,

Lin³

2009

PIER

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Abstract-In recent years, RFID solutions are finding an increasing number of applications in a wide variety of industries. There are some natural limitations when applying RFID technology in the steel industry, because the tags do not function well in metallic environments. Even though some commercial RFID metal tags are available in the market, they are found to be too expensive by steel companies. This paper proposes a useful and practical RFID tag design for management applications involving steel-bar and wirerod products manufactured by the steel industry. The dual-function metallic RFID tag, comprising of both an RFID code and a barcode, involves technology advancement in RFID design, and named WindowTag (WinTag). The maximum read range of this tag can reach about 5.7 m for the radiated power of 4.0 W EIRP in free space. In the practical application, the maximum read ranges are about 2.3 m and 5.0 m for the worst and best case, respectively. The design methodology as well as simulation and measurement results of the WinTag are presented in this paper. The low profile and low cost features of the WinTag makes the RFID tag well suited for metallic type tag of labeling system that requires integration of RFID technology.

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“…In the communication system, read range is one of the most important characteristics of the tag. The theoretical maximum read range r tag depends on the power reflection coefficient and can be calculated using the Friis free-space formula as [10]:…”

Section: Analysis Of Antenna Parametersmentioning

confidence: 99%

Magnetic Substrate Folded Dipole Antenna for Uhf Rfid Metal Tag

Guan¹,

Liang²,

Wang³

et al. 2014

PIER Letters

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Abstract-In this paper, magnetic material was applied in the design of a UHF-RFID metal tag to increase the reading distance. The influence of the electromagnetic properties, especially the electromagnetic loss, of a magnetic substrate on the gain of the tag antenna is discussed by analyzing the reflection and the surface current distribution. As to folded antenna, the loss of energy caused by the magnetic substrate tends to occur in the folding edge of the antenna. Both simulations and experiments indicate that electromagnetic loss markedly reduces the gain rapidly when both the dielectric loss tangent (tan δ) and the magnetic loss tangent (tan δm) are between 0 and 0.3. The reading distance drops from 3 m to 1.5 m when the tan δm of the magnetic composite substrate increases from 0.009 to 0.023. And tan δm should be less than 0.1 for the antenna working excellently. The conclusion offers meaningful guidance for future studies of magnetic substrate folded metal tag.

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Power reflection coefficient analysis for complex impedances in RFID tag design

Cited by 289 publications

References 4 publications

Impedance Matching and Emission Properties of Nanoantennas in an Optical Nanocircuit

Impedance Matching and Emission Properties of Nanoantennas in an Optical Nanocircuit

A Metallic Rfid Tag Design for Steel-Bar and Wire-Rod Management Application in the Steel Industry

Magnetic Substrate Folded Dipole Antenna for Uhf Rfid Metal Tag

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