WO2009019183A2 - Conversion du diagramme d'antenne pour améliorer les propriétés de liaisons radio - Google Patents

Conversion du diagramme d'antenne pour améliorer les propriétés de liaisons radio Download PDF

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Publication number
WO2009019183A2
WO2009019183A2 PCT/EP2008/060014 EP2008060014W WO2009019183A2 WO 2009019183 A2 WO2009019183 A2 WO 2009019183A2 EP 2008060014 W EP2008060014 W EP 2008060014W WO 2009019183 A2 WO2009019183 A2 WO 2009019183A2
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
antenna arrangement
switching element
impedance
switching
Prior art date
Application number
PCT/EP2008/060014
Other languages
German (de)
English (en)
Other versions
WO2009019183A3 (fr
Inventor
Guy-Aymar Chakam
Martin Weinberger
Andreas Schäfer
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2009019183A2 publication Critical patent/WO2009019183A2/fr
Publication of WO2009019183A3 publication Critical patent/WO2009019183A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the invention relates to a device for transmitting and receiving electromagnetic waves and in particular relates to an antenna arrangement with switchable radiation characteristic.
  • radio-based access systems are used by default. These access systems are primarily for the comfortable unlocking and closing of vehicle doors and the trunk, as well as the activation and deactivation of an existing in-vehicle immobilizer.
  • bidirectional communication By integrating bidirectional communication into the radio transmission between the mobile radio station of the access system and the remote terminal formed in the vehicle, data relating to the status of the vehicle can be retrieved over a longer distance by means of the mobile station.
  • the retrieved data typically includes information about the level of the fuel tank, the tire pressure or the like.
  • bidirectional communication usually also offers the possibility of calling additional functions of the vehicle, so that e.g. Have vehicle windows, sunroofs and sliding doors, but also a possibly existing in the vehicle auxiliary heater operated from a distance.
  • the services supported by the radio based access systems require a range of a few meters (e.g., for unlocking the vehicle doors) to a few hundred meters, and for remote sensing, perhaps kilometers.
  • Certain services such as The opening of the vehicle doors can often only be called when a certain distance to the vehicle has been reached.
  • Other services, such as a query of the current parking duration, should be executable over the longest possible distances.
  • the propagation conditions for the radio waves are characterized by different parameters in addition to the distance between the two stations of the access system.
  • radio waves include primarily the polarization direction of the electromagnetic wave used for radio transmission, the type of antenna (s) mounted in or on the vehicle, the type of antenna (s) used in the mobile station, the orientation of the mobile radio station in space, and their location Position in the hand or on the body of the user.
  • a significant influence on propagation conditions for the radio waves also has the nature of the environment in the area of the radio link, which can lead to a multipath propagation of the radio signals.
  • the antenna (s) of the radio station in the vehicle is (are) generally designed such that a certain polarization of the radio wave is preferred for the transmitted and received signals. This is usually the vertical polarization, i. the polarization direction at which the E
  • Vector is aligned vertically. This is due to the predominantly used in vehicles shortened vertical monopole antenna.
  • Monopole antennas and combinations of both types of antennas used are preferred.
  • monopole antennas especially helix antennas are preferred.
  • Loop antennas are characterized by their low hand sensitivity, but generally have a low efficiency and produce a purely linear polarization.
  • monopole antennas are usually greater, but due to the smaller mass counterweight, the power transmitted through the antenna is very sensitive to touch (hand sensitivity).
  • This type of antenna also only supports one direction of polarization and, moreover, also has an additional zero point in the directional diagram.
  • monopole antennas are sometimes used, printed directly on the device's circuit board. In this case, the hand sensitivity is even greater, since when using the device usually the entire antenna is covered by hand.
  • the object of the invention is to specify an antenna arrangement with which the above-mentioned problems can be overcome.
  • the invention comprises an antenna arrangement with an antenna and a switching element, one terminal of which has an electrical connection to a first coupling point on the antenna and whose other terminal is electrically connected to a first impedance, the position of the first coupling point on the antenna and the type and size of the first impedance are chosen so that the directional characteristic and / or the polarization characteristic of the antenna arrangement in a first switching state of the switching element relative to the directional polarization characteristic of the antenna arrangement in a second switching state of the switching element by an angle of more than zero Degree is turned.
  • the invention further comprises a radio device having a mobile radio station and a further radio station, in which at least the mobile radio station has an antenna arrangement according to the invention.
  • a radio device having a mobile radio station and a further radio station, in which at least the mobile radio station has an antenna arrangement according to the invention.
  • the antenna arrangement comprises a control device, which is designed to control the switching state of the switching element, whereby a more or less regular change in the directional characteristic and / or the polarization characteristic of the antenna arrangement is possible.
  • the control device is advantageously designed so that it changes the switching state of the switching element in timed intervals to allow a signal transmission in both directional characteristics and / or polarization characteristics in a kind of time division multiplex.
  • the duration of one switching state advantageously corresponds to the duration of another switching state, so that no transmission in one of the directional characteristics and / or polarization characteristics is preferred.
  • the angle between the directional characteristic and / or polarization direction of the antenna arrangement in a first switching state of the switching element relative to the directional and / or polarization direction of Antenna arrangement in a second switching state of the switching element is approximately ninety degrees. Deviations of 90 degrees are in this respect casual, as the transmission power does not substantially decrease in the direction determined by the 90 degree, that is, in practice does not fall below a value of half of the maximum transmission power in one of the main transmission directions. Of course, this also applies to a rotation of the polarization direction or to a combined change in directional characteristic and polarization of the antenna.
  • the antenna arrangement further comprises a feed network having at least a first and a second matching branch, wherein the control device is configured to connect the first matching branch to the feed-in point of the antenna when the switching element is in a first switching state. and connect the second matching branch to the feeding point of the antenna when the switching element is in a second switching state.
  • the switching element has, on the one hand, at least one further connection, which is electrically connected to a further impedance, and, on the other hand, at least one further one
  • Switching state which establishes an electrical connection of the further impedance with a further coupling point on the antenna and / or with the first impedance.
  • many variants for setting the decisive for the emission of the antenna current distribution on the antenna structure can be selected, so that antenna structures can be created with a variety of different directional characteristics and / or polarization characteristics. If the position of the further coupling point on the antenna coincides with that of the first coupling point, several impedances can be connected together to form another impedance.
  • the antenna comprises a dipole antenna, in which the first coupling point is located at one of the two antenna branches at a distance from the feeding point of the antenna, whereby a switching between a dipole and a monopole characteristic is possible.
  • the dipole antenna is preferably performed folded.
  • the antenna comprises a folded monopole antenna, in which the first coupling point is at the end of the antenna opposite the feed point, whereby it is possible to switch between a monopole and a loop characteristic.
  • the antenna arrangement may also be implemented with an antenna comprising an antenna structure having two antenna elements, wherein the switching element is designed so that the coupling point of the first antenna element can be connected to an impedance or an impedance network and / or the second antenna element in series with the antenna element Impedance or the impedance network can be connected to the coupling point. This allows both the character and the length of the antenna vary.
  • the first impedance and / or the further impedance can be formed by a short circuit to the ground of the antenna arrangement, whereby the type of antenna can be influenced in a simple manner.
  • the first or another coupling point can also be designed as a feed point, wherein the switching element connects the first and / or the further coupling point in a first switching state with the RF terminal and connects in a further switching state with an impedance, so that the current distribution the antenna structure can be changed by the choice of the feed.
  • the impedance can be chosen infinitely, i. that the coupling point remains open when it is not connected to the RF feed.
  • the radio device is preferably designed as part of a vehicle access system. Further features of the invention will become apparent from the following description of inventive embodiments in conjunction with the claims and the figures. The individual features can be realized in an embodiment according to the invention in the manner indicated or in any other combinations. In the following explanation of some embodiments of the invention reference is made to the accompanying figures, of which
  • FIG. 1 shows a schematic representation of an antenna arrangement in which a switchable directional characteristic is achieved by transferring a dipole antenna into a monopole antenna
  • FIG. 2 illustrates the directional characteristics for two switching states of the antenna arrangement of FIG. 1,
  • FIG. 3 shows a first concept for connecting an antenna in an antenna arrangement with a switchable directional characteristic in the form of a block diagram
  • FIG. 4 shows an alternative concept for the connection of an antenna in an antenna arrangement with switchable directional characteristic in the form of a block diagram
  • Figure 5 shows antenna arrangements with different antennas, which allow a switchable directional characteristic
  • FIG. 6 shows an alternative concept for connecting an antenna in an antenna arrangement with a switchable directional characteristic in the form of a block diagram.
  • the schematic representation of FIG. 1 shows an example of an antenna arrangement 10 with reversible directional characteristics. teristics and / or polarization characteristics.
  • the antenna arrangement 10 is composed of an antenna 1 designed in the example as a dipole and an antenna circuit arranged, for example, on a circuit carrier 9.
  • the antenna circuit has a high-frequency supply circuit 6 (HF supply) of a transmitting and / or receiving stage.
  • the RF feed 6 has an RF output with two terminals 4 and 5.
  • Terminal 4 is connected to the electrode Ia of the dipole and terminal 5 to the electrode Ib.
  • port Ib is grounded. However, this is not mandatory. Rather, a symmetrical feeding of both branches Ia and Ib of the dipole 1 is possible.
  • an auxiliary contact Ic adjoins the branch Ib of the dipole 1.
  • the auxiliary contact Ic forms an electrical connection to a first terminal 2a of a switching element 2.
  • the other terminal 2b of the switching element 2 is connected to an impedance 3 whose second contact is grounded.
  • a control device 8 controls the switching state of the switching element 2 via a connection shown in dashed lines in FIG. 1.
  • the switching element 2 is operated in two switching states, one open and one closed. Under open here is to understand a state in which the potentials of the two terminals 2a and 2b are isolated from each other.
  • the term closed means a state in which the two terminals 2a and 2b are connected to each other in a low-impedance manner, so that they are practically at the same potential.
  • the switching element is preferably realized in the form of an electronic switching element, for example as a PIN diode, MEMS (electromechanical microsystems), CMOS switches or in the form of another component with electrically or electronically controllable switching properties.
  • the switching element If the switching element is in the open state, then the current flows along the two branches Ia and Ib of the Dipole 1, so that one obtains a directional dependence on the absolute value of the electric field strength for the electromagnetic wave emitted by the dipole 1, as illustrated in the directional diagram 21 of the representation a of Figure 2.
  • the switching element is in the closed state, then the branch Ib of the dipole at the level of the coupling point 7 is connected to the impedance 3 via the auxiliary contact Ic and the switching element 2.
  • the current distribution on the antenna electrodes Ia and Ib is changed so that the antenna 1 corresponds approximately to a monopole antenna, which in the Representation b of Figure 2 illustrated directivity diagram 22 has.
  • the change in the current distribution on the antenna electrodes Ia and Ib can be further influenced by means of a change in the feed impedance, wherein the change in the feed impedance can be made by the control device 8.
  • a change in the switching state of the switching element 2 therefore causes a rotation of the directional diagram of the antenna assembly 10 and thus the preferred direction for emitting the transmission power by about ninety degrees.
  • a reliable signal transmission can be achieved by the signals are first transmitted to the switching element 2 in a first switching state and the signal transmission is then repeated with the switching element 2 in the other switching state.
  • This double transmission of the radio signals between the mobile station and the on-board station of a vehicle access system in this type of time-division method ensures that the directivity of the antenna of the mobile station is favorable for receiving the signals on at least one of the two transmissions
  • On-board station is. Of course, to the same extent as for sending data, this also applies to receiving data because the directivity of receiving antennas does not differ from the directivity of transmitting antennas.
  • the change in the current distribution on the two antenna branches Ia and Ib also leads to a change in the electric field radiated by the antenna and can thus also lead to a change in the polarization characteristic of the antenna structure.
  • the polarization of the mobile station is not aligned perpendicular to the polarization of the on-board station, at least in one of the two switching states of the antenna arrangement.
  • the switching of the switching element from the current to the other switching state is effected by the control device 8.
  • the duration during which the control device 8 maintains one of the switching states corresponds at least to the duration for the transmission of the smallest information unit of a communication connection between the two stations.
  • the duration of the various switching states during a signal transmission can be chosen the same. This is especially true if there are no indications that one of the two radiation characteristics 20 ensures a more reliable transmission than the other.
  • the current received signal strength at the mobile station can be measured for each of the two directivities 20, whereupon the transmission of signals preferably takes place at the directivity 21 or 22, at which a higher reception field strength was measured.
  • this preference for directivity can be adapted to changing conditions.
  • FIG. 3 shows the concept of an antenna arrangement 30 with switchable directional characteristic and / or polarization characteristic on which the arrangement of FIG. 1 is based, in the form of a block diagram. Since any antenna structures can be used, they are not explicitly shown in the figure, but are generally represented therein by a corresponding block diagram 31.
  • the term "antenna” is understood to mean all devices that are suitable for emitting and / or receiving electromagnetic waves by transforming at least part of a conducted wave into an electromagnetic space wave and / or a part of an electromagnetic space wave into a line-bound wave to be transferred.
  • the antenna 31 is connected via its feed point 32 to the e.g. connected as a matching circuit feed network 35 which, depending on whether the antenna transmits or receives, from the RF terminal 36 of the transmitting and receiving device 37 receives signals or transmits to this.
  • An interface switching network 38 is connected to the coupling point 34 of the antenna 31.
  • the coupling switching network 38 includes at least one switching element 38a and an impedance 38b as described above.
  • a control device 39 controls the transmitting and receiving device 37 and the switching state of the switching element 38a.
  • the optional ground point 33 is only used if the feed of the antenna 31 is not to be symmetrical.
  • the control device 39 controls the transmission and reception of signals by corresponding switching to the respectively required function of the transmitting and receiving device 37.
  • the switching process can be triggered, for example, via the level of the reception stage or a feedback from the radio remote station.
  • the control device 39 controls one or more switching elements 38a of the antenna 31. coupled switching network 38, whereby different impedances 38b are connected to the coupling point 34 of the antenna 31.
  • the coupling point 34 is open in a first switching state of the one switching element 38a or the plurality of switching elements 38a, and connected in a second switching state of the one or more switching elements 38a with the impedance 38b as a load.
  • a rotation of the directivity of the antenna about ninety degrees is preferred.
  • angle deviations corresponding to the half width of the lobes are generally permissible, since they have the above-described operation of the antenna arrangement with respect practically do not affect the signal transmission.
  • the switching element or elements 38a may also have a plurality of switching states which enable connection of the coupling point 34 with a plurality of different impedances 38b.
  • the angle between the lobe maxima of the directional diagrams of two adjacent switching states is less than ninety degrees, whereby a finer alignment graduation of the antenna characteristic is achieved.
  • FIG. 4 An alternative wiring concept for an antenna arrangement with switchable directional characteristic and / or polarization characteristic is shown in FIG.
  • the antenna arrangement 40 changes the emission characteristic of the antenna 41 both via the feed network 45 connected to the antenna 41 at the feed point 42 and via one or more coupling switching networks 48 connected to one or more coupling points 43 and 44
  • the control device 49 is embodied in the connection between the HF output 46 of the transmitting and receiving device and the feed point 42 of the antenna 41 to select active circuit components or matching branches 45a or 45b of the feed network 45 and to control the switching element (s) in the one or more coupling networks 48 so that the one or more coupling points 43 and 44 (or others) other impedances connected or not burdened.
  • Each of the circuit combinations for supply and coupling points selectable by the control device 49 is set up in such a way that the orientation of the emission characteristic generated thereby differs from that in other circuit combinations.
  • the described antenna arrangement is not limited to specific types of antennas. In order to be able to be accommodated in small housings of mobile radio stations, antennas with small designs are always preferred. Examples of corresponding antenna shapes are shown in FIG. 5, whereby other antenna structures can also be used in an antenna arrangement as described above.
  • a folded monopole antenna 50 is shown, whose end 52 opposite the feed point 51 is connected to a terminal of the switching element 53.
  • the other terminal of the switching element 53 is connected to the ground of the circuit carrier 54 (possibly via circuit components, not shown).
  • the switching element 53 is closed, the monopole antenna thus becomes a loop antenna with a correspondingly different direction or polarization characteristic.
  • a folded dipole antenna 60 is shown, whose feed point 63 is arranged at the base 61 of one electrode 61, while the bottom 64 of the other electrode 62 is connected to a terminal of the switching element 65 and via this to the Mass of the circuit substrate 66 can be connected.
  • the third illustration c shows an antenna 70 whose length and tuning via a coupling network 73 can be changed. Depending on the switching state you get a monopole antenna, a loop antenna or a combination of both.
  • the coupling point of the first antenna element 71 can be connected to an impedance 73 or an impedance network 73 and / or the second antenna element 72 can be connected in series with the impedance 73 or the impedance network 73 to the coupling point.
  • the impedance network 73 may also contain switching elements that allow the antenna path 72 to be switched on or off completely.
  • FIG. 6 shows a further embodiment 80 for an antenna arrangement having a switchable directional characteristic and / or polarization characteristic.
  • the change in the radiation pattern of the antenna 81 is achieved in the antenna assembly 80 by a change in the feed point.
  • the antenna 81 has two feed points 81 and 82, which can be selectively connected to the RF connection 86 of the transmitting and receiving device 87 by means of the feed selection switching device 85 controlled by the control device 88.
  • the coupling point and the feed point are thus interchanged, with the antenna contact acting as the coupling point in each case being loaded with an infinite impedance.
  • the antenna arrangement 80 can also have a ground connection 84.
  • antenna 82 first entry point

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un ensemble d'antenne doté d'une antenne (1) et d'un élément de commutation (2) dont une borne de raccordement (2a) est reliée électriquement à un premier point de l'accouplement (7) de l'antenne (1) et dont l'autre borne de raccordement (2b) est reliée électriquement à une première impédance (3). La position du premier point d'accouplement (7) de l'antenne (1) et le type et la taille de la première impédance (3) sont sélectionnés de telle sorte que, dans un premier état de commutation de l'élément de commutation (2), la caractéristique directionnelle de l'ensemble d'antenne (10) soit tournée d'un angle supérieur à zéro par rapport à la caractéristique directionnelle de l'ensemble d'antenne (10) lorsque l'élément de commutation (2) se trouve dans un deuxième état de commutation, et/ou de telle sorte que, dans un premier état de commutation de l'élément de commutation (2, 38a), la caractéristique de polarisation (21) soit tournée d'un angle supérieur à zéro degré par rapport à la caractéristique de polarisation de l'ensemble d'antenne (10, 30, 40) lorsque l'élément de commutation (2, 38a) est dans un deuxième état de commutation.
PCT/EP2008/060014 2007-08-09 2008-07-30 Conversion du diagramme d'antenne pour améliorer les propriétés de liaisons radio WO2009019183A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007037615.6 2007-08-09
DE200710037615 DE102007037615A1 (de) 2007-08-09 2007-08-09 Antennen-Diagrammumschaltung zur Verbesserung der Funkverbindungseigenschaften

Publications (2)

Publication Number Publication Date
WO2009019183A2 true WO2009019183A2 (fr) 2009-02-12
WO2009019183A3 WO2009019183A3 (fr) 2009-04-09

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Application Number Title Priority Date Filing Date
PCT/EP2008/060014 WO2009019183A2 (fr) 2007-08-09 2008-07-30 Conversion du diagramme d'antenne pour améliorer les propriétés de liaisons radio

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DE (1) DE102007037615A1 (fr)
WO (1) WO2009019183A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3043965B1 (fr) * 2015-11-25 2019-03-22 Continental Automotive France Procede et un dispositif de communication pour l'activation a distance d'une fonction d'un vehicule automobile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012438A1 (de) * 2000-03-15 2001-09-27 Daimler Chrysler Ag Schlüsselanordnung und Kommunikationsanordnung zur Funk-Fernsteuerung einer Fahrzeugfunktion
US20050119035A1 (en) * 2002-09-26 2005-06-02 Kentaro Miyano Radio terminal device antenna and radio terminal device
US20050239519A1 (en) * 2003-06-26 2005-10-27 Matsushita Electric Industrial Co., Ltd. Portable wireless machine
WO2006027952A1 (fr) * 2004-09-10 2006-03-16 Matsushita Electric Industrial Co., Ltd. Dispositif d’antenne et appareil mobile sans fil utilisant celle-ci
WO2006064590A1 (fr) * 2004-12-16 2006-06-22 Matsushita Electric Industrial Co., Ltd. Antenne de commutation d’onde polarisee

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10012438A1 (de) * 2000-03-15 2001-09-27 Daimler Chrysler Ag Schlüsselanordnung und Kommunikationsanordnung zur Funk-Fernsteuerung einer Fahrzeugfunktion
US20050119035A1 (en) * 2002-09-26 2005-06-02 Kentaro Miyano Radio terminal device antenna and radio terminal device
US20050239519A1 (en) * 2003-06-26 2005-10-27 Matsushita Electric Industrial Co., Ltd. Portable wireless machine
WO2006027952A1 (fr) * 2004-09-10 2006-03-16 Matsushita Electric Industrial Co., Ltd. Dispositif d’antenne et appareil mobile sans fil utilisant celle-ci
WO2006064590A1 (fr) * 2004-12-16 2006-06-22 Matsushita Electric Industrial Co., Ltd. Antenne de commutation d’onde polarisee

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Publication number Publication date
DE102007037615A1 (de) 2009-02-12
WO2009019183A3 (fr) 2009-04-09

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