• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a radiofrequency or energy transfer communication antenna, in the form of a planar winding (3), in which one of the two ends (32, 34) of the planar winding is connected directly to a metal section or plane (5) surrounding the planar winding without interruption.
    公开号:FR3030908A1
    申请号:FR1462694
    申请日:2014-12-18
    公开日:2016-06-24
    发明作者:Pierre Rizzo
    申请人:STMicroelectronics Rousset SAS；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD This invention relates generally to electronic devices and, more particularly, to devices using a radio frequency communication or energy transfer antenna. B13916 - 14-R0-0859 DESCRIPTION OF THE PRIOR ART More and more electronic devices are so-called "communicating" devices. For the most part, the communication takes place radiofrequency, whether passively (electronic tag equipped only with passive components) or active (tag or electronic device equipped with one or more active circuits). In particular, mobile phone-type devices are increasingly equipped with a Near Field Communication (NFC) function which enables electronic circuits of the telephone to communicate wirelessly and without contact with devices. electronic tags, adapted readers, etc. The telephone is then generally equipped with a communication interface 20 between an antenna and its circuits. This interface is generally referred to as radio frequency head or contactless (contactless) head (CLF).
    [0002] B13916 - 14-R0-0859 2 One or more antennas are then connected to this RF head for radio frequency communications. In such devices, and more generally in any electronic device equipped with an RF communication antenna and / or energy transfer, the integration of the antenna (or antennas) in the device determines the performance of these devices. ci, so the communication and / or energy transfer. SUMMARY An embodiment aims at overcoming all or part of the disadvantages of electronic devices equipped with radiofrequency communication antenna (s) and / or energy transfer. One embodiment aims to propose a new integration solution of an antenna in an electronic device. An embodiment is directed to a solution particularly suited to an antenna intended to be connected to a radio frequency communication head of an electronic device. One embodiment aims at a solution particularly adapted to the integration of an antenna in a metallic environment. Thus, one embodiment provides a radiofrequency or energy transfer communication antenna, in the form of a plane conductive winding, in which one of the two ends of the planar winding is connected directly to a section or plane. metal surrounding the planar winding without interruption. According to one embodiment, the section or metal plane is intended to be connected to ground. According to one embodiment, the end connected to the section or plane is the outer end of the winding. According to one embodiment, the plane comprises an opening in which is placed the planar winding. According to one embodiment, the winding is in an outer diameter of between about 5 and about 20 mm.
    [0003] B13916 - 14-R0-0859 3 According to one embodiment, the center of the winding is in a diameter of between 2 and 5 mm. One embodiment provides a radio frequency circuit comprising: an antenna; a radio frequency head; and an adapter network provided, between each end of the winding and a terminal of the circuit, of a first capacitive element.
    [0004] According to one embodiment, the adaptation network further comprises a second capacitive element connecting the two ends of the winding. One embodiment provides an electronic device incorporating an antenna and / or a radio frequency circuit.
    [0005] According to one embodiment, the opening of the metal plane is intended to receive a camera, a microphone or a brightness sensor. According to one embodiment, the metal plane is a mobile phone cover.
    [0006] BRIEF DESCRIPTION OF THE DRAWINGS These and other features and advantages will be set forth in detail in the following description of particular embodiments in a non-limiting manner with reference to the accompanying figures in which: FIG. 1 schematically illustrates and in block form, an exemplary electronic device architecture of the type to which the embodiments to be described apply; FIGS. 2A, 2B and 2C illustrate an example of the usual arrangement of an antenna at a metal plane of an electronic device; Figure 3 is a schematic representation of an embodiment of an antenna; FIG. 4 schematically and partially shows an embodiment of an electronic device incorporating an antenna of the type of that of FIG. 3; Figs. 5A and 5B are schematic representations of two embodiments of an antenna; FIG. 6 represents a variant of an embodiment of an adaptation network between an antenna and a radiofrequency head; and FIG. 7 is a view, similar to that of FIG. 2A, of a metal cap of an electronic device. Detailed Description The same elements have been designated by the same references in the various figures. In particular, the structural and / or functional elements common to the different embodiments may have the same references and may have identical structural, dimensional and material properties. For the sake of clarity, only the elements useful for understanding the described embodiments have been shown and will be detailed. In particular, the generation and operation of the communications transmitted or picked up by the antenna described have not been detailed, the described embodiments being compatible with the usual applications. In addition, the rest of the electronic device incorporating an antenna has not been detailed, the embodiments described being, again, compatible with the rest of the constituent elements of the electronic devices incorporating one or more communication antennas radio frequency or energy transfer. In the following description, when referring to the terms "about", "approximately" or "of the order of", this means within 10%, preferably within 5%. In the present description, reference is made more particularly to an example of application to a mobile telephone type electronic device equipped with near-field communication functions. However, all that will be described B13916 - 14-R0-0859 more generally applies to any other electronic device incorporating a radiofrequency communication antenna or energy transfer to be placed in a metal environment. FIG. 1 schematically shows in block form an example of an electronic device architecture of the type to which the embodiments to be described apply. This is, for example, a mobile phone equipped with near field communication functions. The electronic circuits 1 (ICs) of the device are capable of exchanging signals (link 12) with a radiofrequency transmission-reception head 2 (CLF) constituting an interface between these circuits 1 and an antenna 3. An adaptation network 4 (MATCHING), constituting a frequency tuning and impedance matching circuit, is interposed between the radiofrequency input-outputs 21 of the head 2 and the antenna 3. The antenna is generally constituted by a winding plane driver. The operation of such an architecture is known and will not be detailed, the described embodiments not modifying the operation in terms of generation and exploitation of the signals by the different elements. Sometimes the position of the antenna in the device is facing a metal plate (typically an element of a device housing such as the shell of a mobile phone). It is then necessary to make an opening in this metal element and to place the plane winding constituting the antenna in this opening. FIGS. 2A, 2B and 2C illustrate an example of a usual arrangement at a metal plane 5 'of an electronic device. Figure 2A schematically shows the metal plane 5 '. FIG. 2B represents an example of a plane conductive winding constituting the antenna 3. FIG. 2C represents the equivalent electrical diagram of the assembly.
    [0007] B13916 - 14-R0-0859 6 In this example, it is desired to place the antenna 3 under the metal shell of the mobile phone constituting the metal plane 5 '. The winding 3 is then placed, at least partially, inside an opening 52 'of the metal plane to allow the radio frequency communication and to pass the field lines through the antenna. We take advantage of the presence of an opening generally present for other purposes, for example for an electronic camera, a microphone, a brightness sensor, etc. Both ends 32 and 34 of the winding 3 are connected to the matching network 4 (Figure 1). This connection is made by insulated wires and / or conductive tracks deposited on an insulating layer (not shown) covering, at least partially, the inner face of the plate 5 '.
    [0008] The presence of the metallic plane disturbs the communication and, in order to avoid the adverse consequences of eddy currents, it is necessary to make a slot 54 'in the metal plane 5', so that the opening 52 ' opens, through the slot 54 ', in an edge of the metal plane 5'.
    [0009] The need for a slot 54 'complicates the realization and is not generally desired. In addition, it weakens the hood or metal case. Figure 3 is a schematic representation of an embodiment of an antenna. This figure represents an equivalent diagram to compare with Figure 2C. According to this embodiment, the antenna 3 is formed of a planar winding placed in an opening 52 of a metal plane 5. In contrast to FIG. 2C, the contour of the opening 52 is closed; that is, the opening 52 does not open into one of the edges of the plane 5. Another difference is that one of the ends, for example the outer end 34, of the winding forming the antenna 3 is connected to the metal plane 5 which is itself intended to be connected to the mass of the electronic device. In addition, the winding 3 is fully contained in the opening.
    [0010] The inventor has discovered that, surprisingly, by electrically connecting one end of the antenna to the surrounding ground plane, the disturbances due to the eddy currents are considerably reduced. the performance of the antenna is improved, even if the opening in which the antenna is placed has a closed contour. FIG. 4 schematically and partially shows an embodiment of an electronic device incorporating an antenna of the type of that of FIG. 3.
    [0011] We find the electronic circuits 1 (ICs) of the device, capable of exchanging signals (link 12) with a radiofrequency transmission-reception head 2 (CLF) forming an interface between these circuits 1 and an antenna 3. A network of adaptation 4 (MATCHING) constituting a frequency matching and impedance matching circuit, is interposed between the radiofrequency input-outputs of the head 2 and the antenna 3. In the example of FIG. a head 2 having two reception terminals Rx and two transmitting terminals Ix of differential mode signals is assumed.
    [0012] The terminals Rx and the terminals Ix of the head 2 are intended to be connected to the ends of the winding of the antenna, via the matching network 4. This matching network 4 comprises at least one capacitive element in series between each terminal Rx or Ix and the end of the winding to which this terminal is to be connected. For example, capacitors Cs are interposed between terminals Ix and ends 32 and 34 and capacitors Crx are interposed between terminals Rx and ends 32 and 34. In addition a capacitive element Cp generally connects ends 32 and 34 between them . The capacitors of the network 4, and in particular the capacitor Cp, participate in the tuning of the frequency of the oscillating circuit comprising the antenna 3, both in reader mode (generation of a field) by adapting the output impedance seen in FIG. Ix terminals at the impedance of the antenna, and in card or receiver mode adapting the impedance to present a resonant circuit having a resonant frequency close to the frequency of the carrier. While one might think detrimental to connect one of the ends of the winding 3 to ground because it would introduce a common mode component in the signals received or emitted by the head 2, the presence at the level of the adaptation network 4 series capacitors, between each terminal of the circuit 2 and the end 32 or 34 to which this terminal is connected, filters this common mode component that would otherwise be provided by the ground. The two ends 32 and 34 of the winding 3 are connected to the matching network 4 by insulated wires 42 and / or by conductive tracks deposited on an insulating layer (not shown) covering, at least partially, the inner face 15 of the Plate 5. Figs. 5A and 5B are diagrammatic representations of two embodiments of an antenna 3. Fig. 3A illustrates the making of an antenna 3 in the form of a circular plane winding surrounded by a conductive section 5. , also circular. In the example of FIG. 5A, the outer end of the winding 3 is connected to the section S. FIG. 5B illustrates the case of a planar conductive winding 3 of square shape, placed in an opening 52, itself of the square shape, made in a metal plane S. In the example of FIG. 5B, the inner end of the winding 3 is connected to the section S. FIG. 6 represents a variant of an embodiment of FIG. an adaptation network 4 'between an antenna 3 and a radiofrequency head. This is, for example, a case where the transmit and receive modes are each associated with a separate antenna. In this example, it is assumed that the antenna serves only to receive data and to return data by load modulation (card emulation mode). The network 4 'then comprises a capacitor Crx between each terminal Rx and the end 32 or 34 of the antenna to which the terminal is to be connected and a capacitor Cp connecting the two ends 32 and 34. of the antenna. Figure 7 is a view, closer to that of Figure 2A, a metal cap of an electronic device. As is apparent from this FIG. 7, the aperture 52 (here circular), for example for an electronic camera, a microphone, a brightness sensor, etc., in which the antenna 3 (not shown in FIG. 7) is placed has a closed contour and does not open into one of the edges of the cover 5. As a particular embodiment, the winding 3 has an outer diameter or is in a diameter of between about 5 and about 20 mm and the center of the winding has a diameter or is in a diameter of between 2 and 5 mm. An advantage of the embodiments described is that it is now possible to associate an antenna with a device equipped with a metal wall. Another advantage is that it is not necessary to interrupt the electrical continuity of such a metal environment around the antenna, which can now be surrounded by a ground plane. The performance of an antenna thus produced is considerably improved. Thus, the inventor was able to perform the following comparative measurements. An antenna 6 mm in diameter inscribed in a square opening of 10 mm side has a level of retromodulation to 3 cm from the antenna of a test drive 3 to 4 times higher than the level obtained for the same antenna of which 30 the outer end of the winding is not connected to the ground plane. According to another example of application, an antenna made with a connection from one end to a ground plane is formed on the rear face (generally metallic) of a flat liquid crystal screen and connected to the ground thereof. .
    [0013] B13916 - 14-R0-0859 Various embodiments have been described. Various variations and modifications will be apparent to those skilled in the art. In particular, the shape of the metal plane surrounding the antenna and to which it is connected depends on the applications and the shape of the electronic device in which the antenna is integrated. Similarly, the shape of the opening made in the metal plane depends on the applications and different variants are possible provided that this opening is closed, that is to say, it does not open into one of the edges of the plane. Furthermore, it will be possible to provide other arrangements of adaptation network 4, provided to respect a common mode isolation between the terminals of the transmission circuit 2 and / or reception and the ends 32 and 34 of the winding forming the In addition, the described embodiments are particularly suitable for circuits performing active retromodulation, that is to say not only modulate the load of the antenna but participate in providing it with energy. Finally, the practical implementation of the embodiments that have been described is within the abilities of those skilled in the art from the functional indications given above.
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. Antenna for radiofrequency communication or energy transfer, in the form of a plane conductive winding (3), in which one of the two ends (32, 34) of the planar winding is connected directly to a metal section or plane (5) surrounding the planar winding without interruption.
    [0002]
    2. Antenna according to claim 1, wherein the section or metal plane (5) is intended to be connected to ground.
    [0003]
    3. Antenna according to claim 1 or 2, wherein the end connected to the section or plane (5) is the outer end (34) of the winding.
    [0004]
    4. Antenna according to any one of claims 1 to 3, wherein the plane (5) has an opening (52) in which is placed the plane winding (3).
    [0005]
    5. Antenna according to any one of claims 1 to 4, wherein the winding (3) is in an outer diameter of between about 5 and about 20 mm.
    [0006]
    6. Antenna according to any one of claims 1 to 5, wherein the center of the winding (3) is in a diameter of between 2 and 5 mm.
    [0007]
    A radio frequency circuit comprising: an antenna according to any one of claims 1 to 5; A radio frequency head (2); and an adaptation network (4) provided, between each end of the winding (32, 34) and a terminal of the circuit, of a first capacitive element (Cs, Crx).
    [0008]
    8. The circuit of claim 7, wherein the matching network (4) further comprises a second capacitive element (Cp) connecting the two ends (32, 34) of the winding (3) .B13916 - 14- R0-0859 12
    [0009]
    9. An electronic device incorporating an antenna according to any one of claims 1 to 6 and / or a radiofrequency circuit according to claim 7 or 8.
    [0010]
    10. Device according to claim 9, wherein the opening (52) of the metal plane (5) is intended to receive a camera, a microphone or a brightness sensor.
    [0011]
    11. Device according to claim 9 or 10, wherein the metal plane (5) is a mobile phone cover.
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    法律状态:
    2015-11-23| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-24| PLSC| Search report ready|Effective date: 20160624 |
    2016-11-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 4 |
    2018-11-27| PLFP| Fee payment|Year of fee payment: 5 |
    2020-10-16| ST| Notification of lapse|Effective date: 20200906 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1462694A|FR3030908B1|2014-12-18|2014-12-18|ANTENNA FOR ELECTRONIC DEVICE|FR1462694A| FR3030908B1|2014-12-18|2014-12-18|ANTENNA FOR ELECTRONIC DEVICE|
    EP15182376.2A| EP3035439B1|2014-12-18|2015-08-25|Antenna for electronic device|
    US14/835,103| US10020580B2|2014-12-18|2015-08-25|Antenna for an electronic device|
    CN201510587304.7A| CN105720351B|2014-12-18|2015-09-15|Antenna for electrical equipment|
    CN201520714423.XU| CN205194822U|2014-12-18|2015-09-15|Radio or power transfer antenna, radio frequency circuit and contain its electronic equipment|
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