Content uploaded by Glauco Fontgalland
Author content
All content in this area was uploaded by Glauco Fontgalland on Feb 01, 2016
Content may be subject to copyright.
A preview of the PDF is not available
Design of a directive antenna with fractal geometry for RFID localization applications
Abstract and Figures
Multiband and directive antennas are very useful in commercial and military applications, especially in Radio Frequency Identification (RFID) applications. With the increasing needs of miniaturization, multiband, very directive antennas and which allow the integration of various wireless technologies, research is oriented following different ways. One of it consists in using fractal elements. Traditionally, an antenna works at a single frequency or at two frequencies, whereas with a fractal antenna, we can have multiple resonance frequencies. For this project, we propose to design a multiband fractal antenna (RFID reader), with a higher directivity for RFID applications.
Figures - uploaded by Glauco Fontgalland
Author content
All figure content in this area was uploaded by Glauco Fontgalland
Content may be subject to copyright.
... Pour les applications de rectennas, on trouve des antennes imprimées de types dipôle [20], [21], [22] et [23] ou boucle circulaire [24]- [25], cadre [26]- [27], anneau [28], spirale [29], croisé [30]- [31], Koch [32]- [33] ainsi que des antennes patch polarisées linéairement ou circulairement. Il est 25 généralement préférable d'avoir des antennes à haut gain car elles permettent de récupérer plus de puissance RF. ...
On assiste depuis quelques années à la prolifération dans le paysage urbain des émetteurs de champ électromagnétique (émissions TNT, téléphonie mobile aux standards GSM, UMTS, LTE et hot spots WiFi…). Cela rend particulièrement attractif etopportuniste la récupération d'énergie électromagnétique pour accroître l’autonomie énergétique des systèmes électroniques à très faible consommation.Plus particulièrement, on a souhaité ici exploiter la proportion grandissante des surfaces vitrées dans l’environnement urbain pour concevoir des rectennas (pour rectifying antennas) sur des matériaux transparents. Ces rectennas ont des caractéristiquesintéressantes puisque pratiquement invisibles, discrètes et facilement intégrables dans l'environnement. Le verre et le plexiglas constituent deux supports disponibles et présents en quantité pour y intégrer des rectennas dédiées à la récupération et la conversion d’énergie électromagnétique. Nous proposerons plusieurs prototypes de rectenna dans un premier temps sur substrat plexiglas. Réalisées ici à partir d’une empreinte métallique, les structures utilisent des antennes planaires développées en technologie CPS pour réduire l’impact visuelet simplifier le processus de réalisation. Différents prototypes et mise en réseaux de prototypes seront réalisés aux actuels standards de communication.Les rectennas optiquement transparentes sur substrat verre utiliseront une technique développée au laboratoire IETR. L’alimentation par ligne CPW permettra de n’utiliser qu’un seul niveau de métallisation et facilitera le report des composants. La structure bi-bande développée (1.85 et 2.45 GHz) sera mesurée au laboratoire ESYCOM sur un banc de mesure dédié permettant une caractérisation en rayonné à l'intérieur de la chambre anéchoîque. Les résultats et performances obtenus (simulation et mesures) en termes de tension de sortie convertie et rendement de conversion montreront le réel apport de ces structures gravées sur des supports transparents ce qui pourra dégager de réelles perspectives d’applications
... Quadro 1 -Relação de artigos Franciscatto et al. (2010) propuseram um projeto de antena fractal multibanda, pois afirmam que aplicações RFID que utilizam multibanda e antenas diretivas são muito úteis em aplicações militares e comerciais. A geometria proposta possibilita que uma antena diretiva tenha comportamento multibanda. ...
The objective of this work was to consolidate the studies regarding RFID and QR code technologies in the context of military organizations. RFID and QR code are technologies that aim to contribute to the control and management of information in search of optimizing organizational processes. Thus, understanding the current state of the art on these technologies are important to know the key contributions and challenges. This study is an exploratory, quantitative approach, based on the Theory of Consolidated Analytic Meta Approach, through a systematic review of the literature. A total of 208 articles were analyzed, of which 60 were from the Web of Science database and 148 from Scopus. The results revealed that the subject has been gaining importance in the last years, due to the increasing number of citations related to the theme. From the analysis of the key words and the main articles on the subject it was also noticed that the applications of RFID technology have been much more widespread than the QR code in the military scope. Among the main applications perceived is a wireless system of identification, with the aid of RFID technology, that contributes to security, logistics, management and communication in the military field. In order to deepen the analysis of the bibliographic research, maps were made with the co-citations and bibliographic coupling for the two databases. In addition, a table was presented summarizing the main advantages and disadvantages of RFID and QR code applications in the military mentioned in the main articles.
In this paper a high gain Sierpinski fractal shape antenna (reader) for RFID applications is proposed. With the increasing needs of multiband, high gain, very directive antennas and good capability of integration of various wireless technologies, the antenna's research can be oriented following different ways. One of them is use fractals elements. Traditionally, an antenna works at a single frequency or at two frequencies, whereas with a fractal antenna, it can be performed to have multiple resonance frequencies. The antenna had been simulated using CST Microwave Studio software. The antenna was fabricated on FR4 substrate and measured using the Vectorial Network Analyser VNA8510. The proposed different antenna profile provides at 868 MHz: a return-loss measured of −16 dB, a high simulated gain of 16.4 dB and radiation efficiency greater than 92%.
The multiband behavior of the fractal Sierpinski antenna is described. Due to its mainly triangular shape, the antenna is compared to the well-known single-band bow-tie antenna. Both experimental and numerical results show that the self-similarity properties of the fractal shape are translated into its electromagnetic behavior. A deeper physical insight on such a behavior is achieved by means of the computed current densities over the antenna surface, which also display some similarity properties through the bands. Peer reviewed
A novel patch antenna with a fractal boundary condition is
proposed. Experimental and numerical results corroborate the fact that
the fractal characteristic of the perimeter produces localised modes.
This property is utilised in the design of a microstrip patch antenna
with a measured directivity of 12.7 dB
A new set of fractal multiband antennas called mod-p Sierpinski
gaskets is presented. Mod-p Sierpinski fractal antennas derive from the
Pascal triangle and present a log-periodic behavior, which is a
consequence of their self-similarity properties. Mod-p Sierpinski
fractal antennas constitute a generalization of the classical Sierpinski
antenna
The multiband properties of self-similar fractals can be
advantageously exploited to design multiband frequency selective
surfaces (FSS). A Sierpinski dipole FSS has been analyzed and measured
and the results show an interesting dual-band behavior. Furthermore a
near-field measurement technique is applied to characterize the FSS
response to different angles of incidence. Finally, it is shown that it
is possible to tune the FSS response by properly perturbating the
geometry of the Sierpinski dipole
"...a blend of erudition (fascinating and sometimes obscure historical minutiae abound), popularization (mathematical rigor is relegated to appendices) and exposition (the reader need have little knowledge of the fields involved) ...and the illustrations include many superb examples of computer graphics that are works of art in their own right." Nature
A simple, fast, numerical model to predict the input parameters of
a network with the topology of the Sierpinski gasket fractal shape, is
introduced. The usefulness of the model is shown through comparison with
experimental results for the SPK90 patch antenna
Fractal FSS: A novel multiband frequency selective surface The Fractal Geometry of Nature The Koch Fractal Monopole Antenna: The Significant of Fractal Geometry in Determining antenna Performance
- J Romeu
- Y Rahmat-Samii
J. Romeu and Y. Rahmat-Samii, " Fractal FSS: A novel
multiband frequency
selective surface, " IEEE Trans. Antennas Propagat., vol.
48, pp.713–719, July 2000.
[4]
B.B. Madelbrot, The Fractal Geometry of Nature, New
York: W.H. Freeman, 19
[5]
S.R. Best, (2005). " The Koch Fractal Monopole Antenna:
The Significant of Fractal Geometry in Determining
antenna Performance. " Technical Report. Manchester,
NH: Cushcraft Corporation.
The Koch Fractal Monopole Antenna: The Significant of Fractal Geometry in Determining antenna Performance
- S R Best
S.R. Best, (2005). "The Koch Fractal Monopole Antenna:
The Significant of Fractal Geometry in Determining
antenna Performance." Technical Report. Manchester,
NH: Cushcraft Corporation.