EP3035439B1 - Antenne pour dispositif électronique - Google Patents

Antenne pour dispositif électronique Download PDF

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Publication number
EP3035439B1
EP3035439B1 EP15182376.2A EP15182376A EP3035439B1 EP 3035439 B1 EP3035439 B1 EP 3035439B1 EP 15182376 A EP15182376 A EP 15182376A EP 3035439 B1 EP3035439 B1 EP 3035439B1
Authority
EP
European Patent Office
Prior art keywords
antenna
winding
plane
electronic device
opening
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP15182376.2A
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German (de)
English (en)
French (fr)
Other versions
EP3035439A1 (fr
Inventor
Pierre Rizzo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STMicroelectronics Rousset SAS
Original Assignee
STMicroelectronics Rousset SAS
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Filing date
Publication date
Application filed by STMicroelectronics Rousset SAS filed Critical STMicroelectronics Rousset SAS
Publication of EP3035439A1 publication Critical patent/EP3035439A1/fr
Application granted granted Critical
Publication of EP3035439B1 publication Critical patent/EP3035439B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/528—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the re-radiation of a support structure

Definitions

  • the present description relates generally to electronic devices and, more particularly, to devices using a radiofrequency communication or energy transfer antenna.
  • More and more electronic devices are so-called “communicating” devices. For the most part, communication takes place by radio frequency, either passively (electronic label equipped only with passive components) or active (label or electronic device equipped with one or more active circuits).
  • devices of the mobile phone type are more and more often equipped with a near field communication function (NFC - Near Field Communication) allowing electronic circuits of the telephone to communicate wirelessly and without contact with similar devices. , electronic labels, suitable readers, etc.
  • the telephone is then generally equipped with a communication interface between an antenna and its circuits. This interface is generally called a radiofrequency head or a contactless (communication) head (CLF - Contact Less Front end).
  • a radiofrequency head or a contactless (communication) head (CLF - Contact Less Front end).
  • CMF contactless
  • One or more antennas are then connected to this RF head for radio frequency communications.
  • the integration of the antenna (or antennas) in the device conditions the performance of these. ci, therefore communication and / or energy transfer.
  • the document US 2011/0068385 describes a semiconductor device.
  • the document US2011 / 287715A1 describes an antenna formed of a plane winding, said antenna being placed opposite an opening formed in a conductive plane.
  • One embodiment aims to overcome all or part of the drawbacks of electronic devices equipped with radiofrequency communication and / or energy transfer antenna (s).
  • One embodiment aims to propose a new solution for integrating an antenna into an electronic device.
  • One embodiment is aimed at a solution which is particularly suitable for an antenna intended to be connected to a radiofrequency communication head of an electronic device.
  • One embodiment is aimed at a solution which is particularly suitable for the integration of an antenna in a metallic environment.
  • one embodiment provides a device according to claim 1.
  • the figure 1 represents, schematically and in the form of blocks, an example of the architecture of an electronic device of the type to which the embodiments which will be described apply.
  • 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.
  • a matching network 4 (MATCHING), constituting a frequency tuning and impedance matching circuit, is interposed between the radiofrequency inputs-outputs 21 of the head 2 and the antenna 3.
  • the antenna generally consists of a winding driver plan.
  • a metal plate typically an element of a housing of the device such as the shell of a mobile phone.
  • the figures 2A, 2B and 2C illustrate an example of a usual arrangement at the level of a metal plane 5 ′ of an electronic device.
  • the figure 2A schematically represents the metal plane 5 '.
  • the figure 2B represents an example of a flat conductive winding constituting the antenna 3.
  • the figure 2C represents the equivalent electrical diagram of the assembly.
  • the antenna 3 under the metal shell of the mobile telephone constituting the metal plane 5 '.
  • the winding 3 is then placed, at least partially, inside an opening 52 'of the metallic plane to allow radiofrequency communication and to pass the field lines through the antenna.
  • Advantage is taken of the presence of an opening generally present for other purposes, for example for an electronic camera, a microphone, a light sensor, etc.
  • the two 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 by conductive tracks deposited on an insulating layer (not shown) covering, at least partially, the internal face of the plate 5 ′.
  • the figure 3 is a schematic representation of an embodiment of an antenna. This figure represents an equivalent diagram to be compared to the figure 2C .
  • the antenna 3 is formed of a plane winding placed in an opening 52 of a metal plane 5. Unlike the figure 2C , the outline of the opening 52 is closed, that is to say that 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 ground of the electronic device. In addition, the winding 3 is completely contained in the opening.
  • the figure 4 schematically and partially shows an embodiment of an electronic device incorporating an antenna of the type of that of the figure 3 .
  • the terminals Rx and the terminals Tx of the head 2 are intended to be connected to the ends of the winding of the antenna, by means of the matching network 4.
  • This matching network 4 comprises at least one capacitive element in series between each Rx or Tx terminal and the end of the winding to which this terminal is to be connected.
  • capacitors Cs are interposed between the terminals Tx and the ends 32 and 34 and capacitors Crx are interposed between the terminals Rx and the ends 32 and 34.
  • a capacitive element Cp generally connects the ends 32 and 34 together. .
  • 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 internal face of the plate. 5.
  • the figures 5A and 5B are schematic representations of two embodiments of an antenna 3.
  • the figure 5A illustrates the embodiment of an antenna 3 in the form of a circular planar winding surrounded by a conductive section 5, also circular.
  • the outer end of winding 3 is connected to section 5.
  • the figure 5B illustrates the case of a flat conductive winding 3 of square shape, placed in an opening 52, itself of square shape, made in a metal plane 5.
  • the internal end of the winding 3 is connected to the section 5.
  • the figure 6 represents a variant of an embodiment of a matching network 4 ′ between an antenna 3 and a radiofrequency head. This is, for example, a case where the transmission and reception modes are each associated with a separate antenna.
  • 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.
  • the figure 7 is a view, to be compared to that of the figure 2A , a metal cover of an electronic device.
  • the opening 52 (here circular), for example for an electronic camera, a microphone, a light sensor, etc., in which the antenna 3 is placed (not shown in figure 7 ) has a closed contour and does not open into one of the edges of the cover 5.
  • the winding 3 has an external diameter or is part of a diameter between about 5 and about 20 mm and the center of the winding has a diameter or is part of a diameter included between 2 and 5 mm.
  • One 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 metallic environment around the antenna, the latter now being able to be surrounded by a ground plane.
  • An antenna of 6 mm in diameter inscribed in a square opening of 10 mm on the side has a back-modulation level 3 cm from the antenna of a test reader that is 3 to 4 times higher than the level obtained for the same antenna of which l The outer end of the winding is not connected to the ground plane.
  • an antenna produced 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.
  • the shape of the metallic plane surrounding the antenna and to which it is connected depends on the applications and on the shape of the electronic device in which the antenna is integrated.
  • 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 that it does not open into one of the edges of the plane.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Near-Field Transmission Systems (AREA)
  • Support Of Aerials (AREA)
EP15182376.2A 2014-12-18 2015-08-25 Antenne pour dispositif électronique Active EP3035439B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1462694A FR3030908B1 (fr) 2014-12-18 2014-12-18 Antenne pour dispositif electronique

Publications (2)

Publication Number Publication Date
EP3035439A1 EP3035439A1 (fr) 2016-06-22
EP3035439B1 true EP3035439B1 (fr) 2020-12-16

Family

ID=52477973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15182376.2A Active EP3035439B1 (fr) 2014-12-18 2015-08-25 Antenne pour dispositif électronique

Country Status (4)

Country Link
US (1) US10020580B2 (zh)
EP (1) EP3035439B1 (zh)
CN (2) CN105720351B (zh)
FR (1) FR3030908B1 (zh)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6079932B2 (ja) * 2014-04-28 2017-02-15 株式会社村田製作所 無線ｉｃデバイス、クリップ状ｒｆｉｄタグおよびｒｆｉｄタグ付き物品
FR3030908B1 (fr) * 2014-12-18 2016-12-09 Stmicroelectronics Rousset Antenne pour dispositif electronique
US10333200B2 (en) * 2015-02-17 2019-06-25 Samsung Electronics Co., Ltd. Portable device and near field communication chip
WO2019077830A1 (ja) * 2017-10-20 2019-04-25 株式会社村田製作所 カード型無線通信デバイス
US11502388B2 (en) 2018-01-22 2022-11-15 Stmicroelectronics, Inc. Electronic device including an antenna
USD917434S1 (en) * 2018-04-25 2021-04-27 Dentsply Sirona Inc. Dental tool with transponder
EP3949007A1 (de) * 2019-03-29 2022-02-09 Saint-Gobain Glass France Antennenscheibe

Citations (3)

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US6407721B1 (en) * 2001-03-28 2002-06-18 Raytheon Company Super thin, cavity free spiral antenna
US20080150693A1 (en) * 2006-12-20 2008-06-26 You Hong Jun Multiple loop antenna for rfid reader, rfid reader having same and rfid system having the rfid reader
US20110068385A1 (en) * 2005-05-31 2011-03-24 Semiconductor Energy Laboratory Co., Ltd. Semiconductor device

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US7239290B2 (en) * 2004-09-14 2007-07-03 Kyocera Wireless Corp. Systems and methods for a capacitively-loaded loop antenna
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Publication number Priority date Publication date Assignee Title
US6407721B1 (en) * 2001-03-28 2002-06-18 Raytheon Company Super thin, cavity free spiral antenna
US20110068385A1 (en) * 2005-05-31 2011-03-24 Semiconductor Energy Laboratory Co., Ltd. Semiconductor device
US20080150693A1 (en) * 2006-12-20 2008-06-26 You Hong Jun Multiple loop antenna for rfid reader, rfid reader having same and rfid system having the rfid reader

Also Published As

Publication number Publication date
CN205194822U (zh) 2016-04-27
EP3035439A1 (fr) 2016-06-22
CN105720351B (zh) 2019-08-16
US10020580B2 (en) 2018-07-10
US20160181696A1 (en) 2016-06-23
CN105720351A (zh) 2016-06-29
FR3030908B1 (fr) 2016-12-09
FR3030908A1 (fr) 2016-06-24

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