EP1825565B1 - Optimisation of forbidden photon band antennae - Google Patents
Optimisation of forbidden photon band antennae Download PDFInfo
- Publication number
- EP1825565B1 EP1825565B1 EP05818906A EP05818906A EP1825565B1 EP 1825565 B1 EP1825565 B1 EP 1825565B1 EP 05818906 A EP05818906 A EP 05818906A EP 05818906 A EP05818906 A EP 05818906A EP 1825565 B1 EP1825565 B1 EP 1825565B1
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- Prior art keywords
- rods
- source
- height
- antenna according
- antenna
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
- H01Q15/0066—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces said selective devices being reconfigurable, tunable or controllable, e.g. using switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
Definitions
- the present invention relates to photonic bandgap antennas.
- Photonic bandgap structures are known by the abbreviation BIP, generally by the term "Photonic Band Gap Structure” or PBG structure in English, for periodic structures that prohibit the propagation of a wave for certain frequency bands . Structures were first used in the optical field, but in recent years their application has been extended to other frequency ranges. Photonic bandgap structures are used in particular in microwave devices such as filters, antennas or the like.
- metal structures that use a periodic distribution of metal elements, others a periodic distribution of dielectric elements but also metallo-dielectric structures.
- the present invention relates to a photonic band gap structure using metal elements, more particularly parallel rods perfectly conducting and arranged periodically.
- Photonic bandgap antennas based on metal elements such as parallel metal rods have already been studied. So, the article published in the journal Chin. Phys.Lett. Flight. 19, No. 6 (2002) 804 entitled “Metal Photonic Band Gap Resonant Antenna with High Directivity and High Radiation Resistance", Lin Qien, FU-Jian, HE Sai-Ling, Zhang Jian-Wu studies a resonant structure with metallic photonic bandgap (MBPG) formed of infinitely long parallel metal rods in the Z direction.
- MBPG metallic photonic bandgap
- This article studies more particularly the directivity and the resistance to radiation for a certain range of frequencies of a resonant antenna (MPBG) comprising a linear radiation source antenna and a cavity constructed in a metallic photonic structure formed of parallel metallic rods, the cavity being obtained by eliminating some rods around the source antenna.
- MPBG resonant antenna
- the present invention relates to a photonic band gap antenna (BIP) which is made with metal rods of finite length, the height of the rods relative to the substrate receiving the radiating source being controlled so as to control the radiation pattern of the antenna in the vertical plane.
- BIP photonic band gap antenna
- the present invention relates to a photonic bandgap antenna (BIP) having, in a plane of x, y directions, a radiating source and a photonic bandgap structure consisting of parallel metal rods, perpendicular to the plane, the rods of diameter d. repeating nx times with a period x in the x direction and n y times with a period y in the y direction, characterized in that the height of the rods seen from the radiating source is increasing.
- BIP photonic bandgap antenna
- the height of the rods between the source and the outermost rod is chosen to be greater than kh / n, n being equal to the number of stems seen from the source, h being the height of the outermost stem and k an integer varying between 1 and n.
- the height of the first metal rods seen by the source is chosen to be greater than 3 ⁇ 1 where I is the height of the radiating source.
- I is the height of the radiating source.
- the BIPM effect is obtained, ie one obtains as a function of the period at a given frequency bandwidths and forbidden.
- the heights of the rods between the source and the outermost rod follow an increasing monotonous function.
- the numbers of rods are identical. They are chosen such that n ⁇ 3.
- the numbers of stems seen from the source can be different, which gives numbers nx and ny of stems with different values.
- the reproduction periods x and y of the metal rods in the x and y directions are chosen to be identical. However, these periods a x and a y may be different.
- the stems are made of a metal material having a conductivity greater than 10 -7 such as copper (5.9.10 7 S / m), silver (4.1.10 7 S / m), aluminum (3.5 ⁇ 10 7 S / m) or the like.
- the source is constituted by a vertical dipole or monopole attached to the ground plane substrate. Said source is positioned in place of one of the metal rods or between the metal rods.
- the figure 3 is a diagram showing the bandwidths and band gaps of a photonic bandgap antenna as a function of operating frequency and period.
- the figure 4 schematically shows in A a 3D view and in B a top view of a photonic band gap antenna, according to an embodiment of the present invention.
- the figure 5 represents three configurations of photonic band gap antennas with metal rods of different height according to the views with, for each configuration, an elevation radiation pattern and a 3D radiation pattern.
- the figure 1 represents an antenna 1 consisting of a dipole 10, positioned in the middle of a photonic bandgap structure (BIP), formed of metal rods 11 of finite height (referenced structure BIPM).
- the metal rods are made of a material having a conductivity greater than 10 -7 such as copper, silver, aluminum or the like.
- the metal rods 11 are arranged in 7 rows of 7 elements, the rows and the elements being spaced apart from each other by a distance a giving the pitch or the period of the photonic bandgap structure.
- a BIPM structure having numbers n x and n y and that different periods x and y in the x and y directions may also be considered in the context of the present invention.
- Radiation diagrams show the effect of the BIPM structure on the radiation pattern of a dipole antenna. Indeed, the presence of a metallic BIP structure shows at the working frequency preferred directions of radiation at 0 °, 90 °, 180 ° and 270 ° and radiation minima at 45 °, 135 °, 225 °, 315 °.
- the height of the metal rods of the Figure 1A has been modified so that, from the source, the heights of the stems are increasing.
- the use of the height-adjustable rods allows the control of the elevation radiation pattern while maintaining the same azimuth pattern.
- FIG 5 there is shown a photonic band gap antenna in which the source 10 sees three metal rods of height h finite and identical.
- the elevation radiation pattern has several minima due to pass-through or blocking behaviors of the metal photonic band gap structure for the apparent period in the considered direction.
- This diagram is similar to the diagram in Figure 2B.
- the 3D radiation pattern has along the z axis a radiation lobe. Indeed, when the rods are of constant heights h, the radiation pattern is preserved in the xOy plane but evolves in the xOz plane as a function of h.
- the height of the 3 metal rods seen by the source 10 is different from one rod to the other and increasing so that H3 ⁇ H2 ⁇ H1.
- the heights H3, H2, H1 can follow an increasing monotonous function.
- the height of the rods H3, H2, H1 between the source and the outermost rod (H1) is chosen to be greater than kH1 / n, n being equal to the number of rods seen from the source (3). in the embodiment shown), H1 the height of the outer rod and k an integer varying between 1 and n.
- the height H3 must be at least 3 x I where I is the height of the radiating source.
- the source 10 has three metal rods whose height is increasing from the source to the outer rod H'1 rectifc H'3 ⁇ H'2 ⁇ H'1.
- the size of the metal rods substantially follows the equation given above.
- the elevation diagram of the Figure 5C shows a significant decrease of the secondary lobes due to the particular structure of the metallic BIP, which is also found on the 3D diagram.
- the present invention has been described with reference to an antenna in which the source is positioned in place of a metal rod in the center of the metallic BIP structure. However, it is possible to position the source between the rods. On the other hand, the source may be off-center in the photonic band gap structure.
- the source used in the embodiments described above is a dipole. However, in a practical embodiment, a vertical monopoly mounted on a ground plane substrate is used in which the metal rods of the BIPM structure are also mounted.
- the number of rods in the x direction may be the same or different from the number of rods in the y direction.
- the periodicity a x and y between the rods along the x or y directions may be identical, as in the described embodiments, or different.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Description
La présente invention concerne les antennes à bandes interdites photoniques.The present invention relates to photonic bandgap antennas.
Les structures à bandes interdites photoniques sont connues sous l'abréviation BIP, de manière générale sous le terme « Photonic Band Gap Structure ou PBG structure » en langue anglaise, pour des structures périodiques qui interdisent la propagation d'une onde pour certaines bandes de fréquences. Les structures ont tout d'abord été utilisées dans le domaine optique mais, depuis quelques années, leur application est étendue à d'autres gammes de fréquences. Les structures à bandes interdites photoniques sont utilisées notamment dans des dispositifs micro-ondes tels que des filtres, des antennes ou similaire.Photonic bandgap structures are known by the abbreviation BIP, generally by the term "Photonic Band Gap Structure" or PBG structure in English, for periodic structures that prohibit the propagation of a wave for certain frequency bands . Structures were first used in the optical field, but in recent years their application has been extended to other frequency ranges. Photonic bandgap structures are used in particular in microwave devices such as filters, antennas or the like.
Parmi les structures à bandes interdites photoniques, on trouve des structures métalliques qui utilisent une distribution périodique d'éléments métalliques, d'autres une distribution périodique d'éléments diélectriques mais aussi des structures métallo-diélectriques.Among the photonic band gap structures, there are metal structures that use a periodic distribution of metal elements, others a periodic distribution of dielectric elements but also metallo-dielectric structures.
La présente invention se rapporte à une structure à bandes interdites photoniques utilisant des éléments métalliques, plus particulièrement des tiges parallèles parfaitement conductrices et disposées périodiquement.The present invention relates to a photonic band gap structure using metal elements, more particularly parallel rods perfectly conducting and arranged periodically.
Des antennes à bandes interdites photoniques à base d'éléments métalliques tels que des tiges métalliques parallèles ont déjà été étudiées. Ainsi, l'article publié dans la revue
Cet article étudie plus particulièrement la directivité et la résistance au rayonnement pour une certaine gamme de fréquences d'une antenne résonnante (MPBG) comportant une antenne source à rayonnement linéaire et une cavité construite dans une structure photonique métallique formée de tiges métalliques parallèles, la cavité étant obtenue en éliminant certaines tiges autour de l'antenne source. Les études sur les antennes à bandes interdites photoniques de ce type ont été réalisées avec des tiges métalliques infinies ou supposées comme telle.This article studies more particularly the directivity and the resistance to radiation for a certain range of frequencies of a resonant antenna (MPBG) comprising a linear radiation source antenna and a cavity constructed in a metallic photonic structure formed of parallel metallic rods, the cavity being obtained by eliminating some rods around the source antenna. Studies on photonic bandgap antennas of this type have been carried out with metal rods that are infinite or supposed to be such.
La présente invention concerne une antenne à bandes interdites photoniques (BIP) qui est réalisée avec des tiges métalliques de longueur finie, la hauteur des tiges par rapport au substrat recevant la source rayonnante étant contrôlée de manière à contrôler le diagramme de rayonnement de l'antenne dans le plan vertical.The present invention relates to a photonic band gap antenna (BIP) which is made with metal rods of finite length, the height of the rods relative to the substrate receiving the radiating source being controlled so as to control the radiation pattern of the antenna in the vertical plane.
La présente invention concerne une antenne à bandes interdites photoniques (BIP) comportant, selon un plan de directions x, y, une source rayonnante et une structure à bandes interdites photoniques constituée par des tiges métalliques parallèles, perpendiculaires au plan, les tiges de diamètre d se répétant nx fois avec une période ax dans la direction x et ny fois avec une période ay dans la direction y, caractérisée en ce que la hauteur des tiges vues à partir de la source rayonnante est croissante.The present invention relates to a photonic bandgap antenna (BIP) having, in a plane of x, y directions, a radiating source and a photonic bandgap structure consisting of parallel metal rods, perpendicular to the plane, the rods of diameter d. repeating nx times with a period x in the x direction and n y times with a period y in the y direction, characterized in that the height of the rods seen from the radiating source is increasing.
Selon un mode de réalisation préférentiel, la hauteur des tiges comprises entre la source et la tige la plus extérieure est choisie pour être supérieure à kh/n, n étant égal au nombre de tiges vues à partir de la source, h étant la hauteur de la tige la plus extérieure et k un entier variant entre 1 et n.According to a preferred embodiment, the height of the rods between the source and the outermost rod is chosen to be greater than kh / n, n being equal to the number of stems seen from the source, h being the height of the outermost stem and k an integer varying between 1 and n.
De préférence, la hauteur des premières tiges métalliques vue par la source est choisie pour être supérieure à 3 x I où I est la hauteur de la source rayonnante. A cette valeur, l'effet BIPM est obtenu, à savoir l'on obtient en fonction de la période à une fréquence donnée des bandes passantes et interdites.Preferably, the height of the first metal rods seen by the source is chosen to be greater than 3 × 1 where I is the height of the radiating source. At this value, the BIPM effect is obtained, ie one obtains as a function of the period at a given frequency bandwidths and forbidden.
De préférence, les hauteurs des tiges comprises entre la source et la tige la plus extérieure suivent une fonction monotone croissante. De préférence, selon chaque direction x ou y, les nombres de tiges sont identiques. Ils sont choisis tels que n ≥ 3. Toutefois, les nombres de tiges vues à partir de la source peuvent être différents, ce qui donne des nombres nx et ny de tiges ayant des valeurs différentes.Preferably, the heights of the rods between the source and the outermost rod follow an increasing monotonous function. Preferably, in each direction x or y, the numbers of rods are identical. They are chosen such that n ≥ 3. However, the numbers of stems seen from the source can be different, which gives numbers nx and ny of stems with different values.
Selon une caractéristique préférentielle de la présente invention, les périodes ax et ay de reproduction des tiges métalliques selon les directions x et y sont choisies pour être identiques. Toutefois, ces périodes ax et ay peuvent être différentes.According to a preferred feature of the present invention, the reproduction periods x and y of the metal rods in the x and y directions are chosen to be identical. However, these periods a x and a y may be different.
Selon un mode de réalisation de la présente invention, les tiges sont réalisées en un matériau métallique présentant une conductivité supérieure à 10-7 tel que le cuivre (5.9.107 S/m), l'argent (4.1.107 S/m), l'aluminium (3.5.107 S/m) ou similaire.According to one embodiment of the present invention, the stems are made of a metal material having a conductivity greater than 10 -7 such as copper (5.9.10 7 S / m), silver (4.1.10 7 S / m), aluminum (3.5 × 10 7 S / m) or the like.
D'autre part, la source est constituée par un dipôle ou un monopole vertical fixé au substrat formant plan de masse. Ladite source est positionnée à la place d'une des tiges métalliques ou entre les tiges métalliques.On the other hand, the source is constituted by a vertical dipole or monopole attached to the ground plane substrate. Said source is positioned in place of one of the metal rods or between the metal rods.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description de différents modes de réalisation préférentiels, cette description étant faite avec référence aux dessins ci-annexés, dans lesquels :Other features and advantages of the present invention will appear on reading the description of various preferred embodiments, this description being made with reference to the accompanying drawings, in which:
La
La
La
La
La
Les exemples décrits ci-après sont des réalisations schématiques qui ne sont pas limitatives. Ces réalisations ont permis de tester la faisabilité et les résultats obtenus avec la structure conforme à l'invention. Toutefois, dans une réalisation pratique, on utilisera de préférence un monopole monté sur un plan de masse avec des tiges elles aussi fixées sur ledit plan, plutôt qu'un dipôle.The examples described below are schematic embodiments that are not limiting. These achievements made it possible to test the feasibility and the results obtained with the structure according to the invention. However, in a practical embodiment, use will preferably monopoly mounted on a ground plane with rods also fixed on said plane, rather than a dipole.
La
Comme représenté sur la
Dans le mode de réalisation représenté sur la
L'antenne telle que représentée à la
La
Les diagrammes de rayonnement permettent de mettre en évidence l'effet obtenu par la structure BIPM sur le diagramme de rayonnement d'une antenne formée d'un dipôle. En effet, la présence d'une structure BIP métallique fait apparaître à la fréquence de travail des directions privilégiées de rayonnement à 0°, 90°, 180° et 270° et des minima de rayonnement à 45°, 135°, 225°, 315°.Radiation diagrams show the effect of the BIPM structure on the radiation pattern of a dipole antenna. Indeed, the presence of a metallic BIP structure shows at the working frequency preferred directions of radiation at 0 °, 90 °, 180 ° and 270 ° and radiation minima at 45 °, 135 °, 225 °, 315 °.
La
Ainsi, en utilisant le diagramme de la
On décrira maintenant avec référence aux
Comme cela sera expliqué ci-après, l'utilisation des tiges à hauteur variable permet le contrôle du diagramme de rayonnement en élévation tout en conservant le même diagramme en azimut.As will be explained below, the use of the height-adjustable rods allows the control of the elevation radiation pattern while maintaining the same azimuth pattern.
Sur la
Conformément à la présente invention et comme représenté sur la
Une autre structure conforme à la présente invention a été représentée dans la partie C de la
La présente invention a été décrite en se référant à une antenne dans laquelle la source est positionnée à la place d'une tige métallique au centre de la structure BIP métallique. Toutefois, il est possible de positionner la source entre les tiges. D'autre part, la source peut être excentrée dans la structure à bandes interdites photoniques métallique. La source utilisée dans les modes de réalisation décrits ci-dessus est un dipôle. Toutefois, dans un mode de réalisation pratique, on utilise un monopole vertical monté sur un substrat formant plan de masse dans lequel sont aussi montées les tiges métalliques de la structure BIPM. Le nombre de tiges dans la direction x peut être identique ou différent du nombre de tiges dans la direction y. De plus, la périodicité ax et ay entre les tiges selon les directions x ou y peut être identique, comme dans les modes de réalisation décrits, ou différente.The present invention has been described with reference to an antenna in which the source is positioned in place of a metal rod in the center of the metallic BIP structure. However, it is possible to position the source between the rods. On the other hand, the source may be off-center in the photonic band gap structure. The source used in the embodiments described above is a dipole. However, in a practical embodiment, a vertical monopoly mounted on a ground plane substrate is used in which the metal rods of the BIPM structure are also mounted. The number of rods in the x direction may be the same or different from the number of rods in the y direction. In addition, the periodicity a x and y between the rods along the x or y directions may be identical, as in the described embodiments, or different.
Claims (10)
- Photonic band gap (PBG) antenna comprising, according to a plane of directions x, y, a radiating source 10 and a photonic band gap structure constituted by parallel metal rods, perpendicular to the said plane, the rods of diameter d repeating themselves nx times with a period ax in the direction x and ny times with a period ay in the direction y, characterized in that the height (H3,H2,H1; H'3,H'2,H'1) of the rods seen from the radiating source is increasing.
- Antenna according to claim 1, characterized in that the heights (H'3, H'2, H'1) of the rods between the source and the outermost rod is chosen to be greater than k h/n, n being equal to the number of rods seen from the source, h being the height of the outermost rod and k an integer varying between 1 and n.
- Antenna according to claim 1 or 2, characterized in that the heights of the rods between the source and the outermost rod follow an increasing monotonic function.
- Antenna according to any one of claims 1 to 3, characterized in that the total numbers nx and ny of rods in the directions x and y are identical.
- Antenna according to any one of claims 1 to 4, characterized in that the number n of rods seen from the source is chosen such that n ≥ 3.
- Antenna according to any one of claims 1 to 5, characterized in that the periods ax and ay in the directions x and y are identical.
- Antenna according to any one of claims 1 to 6, characterized in that the rods are produced in a metal material presenting a conductivity greater than 10-7 such as copper, silver, aluminium.
- Antenna according to any one of claims 1 to 7, characterized in that the height (H3,H'3) of the first rod seen from the source is chosen such that H ≥ 3.1 where I is the height of the radiating source.
- Antenna according to any one of claims 1 to 8, characterized in that the source (10) is constituted by a dipole or vertical monopole placed above the substrate.
- Antenna according to any one of claims 1 to 9, characterized in that the source (10) is positioned in the place of a rod or between the rods.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0452947A FR2879356A1 (en) | 2004-12-13 | 2004-12-13 | IMPROVEMENT OF PHOTONIC PROHIBITED BAND ANTENNAS |
PCT/FR2005/050985 WO2006064140A1 (en) | 2004-12-13 | 2005-11-24 | Optimisation of forbidden photon band antennae |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1825565A1 EP1825565A1 (en) | 2007-08-29 |
EP1825565B1 true EP1825565B1 (en) | 2009-08-19 |
Family
ID=34955398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05818906A Expired - Fee Related EP1825565B1 (en) | 2004-12-13 | 2005-11-24 | Optimisation of forbidden photon band antennae |
Country Status (8)
Country | Link |
---|---|
US (1) | US7719478B2 (en) |
EP (1) | EP1825565B1 (en) |
JP (1) | JP2008523676A (en) |
KR (1) | KR20070086011A (en) |
CN (1) | CN101073183A (en) |
DE (1) | DE602005016147D1 (en) |
FR (1) | FR2879356A1 (en) |
WO (1) | WO2006064140A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1239223A (en) * | 1984-07-02 | 1988-07-12 | Robert Milne | Adaptive array antenna |
US5689275A (en) * | 1995-05-16 | 1997-11-18 | Georgia Tech Research Corporation | Electromagnetic antenna and transmission line utilizing photonic bandgap material |
US6483640B1 (en) * | 1997-04-08 | 2002-11-19 | The United States Of America As Represented By The Secretary Of The Navy | Optical notch filters based on two-dimensional photonic band-gap materials |
GB0015895D0 (en) * | 2000-06-28 | 2000-08-23 | Plasma Antennas Limited | An antenna |
US7117133B2 (en) * | 2001-06-15 | 2006-10-03 | Massachusetts Institute Of Technology | Photonic band gap structure simulator |
FR2863109B1 (en) * | 2003-11-27 | 2006-05-19 | Centre Nat Rech Scient | CONFIGURABLE AND ORIENTABLE SENDING / RECEIVING RADIATION DIAGRAM ANTENNA, CORRESPONDING BASE STATION |
-
2004
- 2004-12-13 FR FR0452947A patent/FR2879356A1/en not_active Withdrawn
-
2005
- 2005-11-24 EP EP05818906A patent/EP1825565B1/en not_active Expired - Fee Related
- 2005-11-24 JP JP2007544952A patent/JP2008523676A/en not_active Withdrawn
- 2005-11-24 US US11/791,691 patent/US7719478B2/en not_active Expired - Fee Related
- 2005-11-24 CN CNA2005800417019A patent/CN101073183A/en active Pending
- 2005-11-24 KR KR1020077013103A patent/KR20070086011A/en not_active Application Discontinuation
- 2005-11-24 WO PCT/FR2005/050985 patent/WO2006064140A1/en active Application Filing
- 2005-11-24 DE DE602005016147T patent/DE602005016147D1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1825565A1 (en) | 2007-08-29 |
US7719478B2 (en) | 2010-05-18 |
CN101073183A (en) | 2007-11-14 |
DE602005016147D1 (en) | 2009-10-01 |
KR20070086011A (en) | 2007-08-27 |
FR2879356A1 (en) | 2006-06-16 |
US20080191962A1 (en) | 2008-08-14 |
JP2008523676A (en) | 2008-07-03 |
WO2006064140A1 (en) | 2006-06-22 |
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