EP3035439A1 - Antenne für elektronische vorrichtung - Google Patents

Antenne für elektronische vorrichtung Download PDF

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Publication number
EP3035439A1
EP3035439A1 EP15182376.2A EP15182376A EP3035439A1 EP 3035439 A1 EP3035439 A1 EP 3035439A1 EP 15182376 A EP15182376 A EP 15182376A EP 3035439 A1 EP3035439 A1 EP 3035439A1
Authority
EP
European Patent Office
Prior art keywords
antenna
winding
plane
metal
electronic device
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.)
Granted
Application number
EP15182376.2A
Other languages
English (en)
French (fr)
Other versions
EP3035439B1 (de
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/de
Application granted granted Critical
Publication of EP3035439B1 publication Critical patent/EP3035439B1/de
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 generally relates 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.
  • the communication is done in radiofrequency, either passively (electronic tag equipped only with passive components) or active (tag or electronic device equipped with one or more active circuits).
  • devices of the mobile phone type are increasingly equipped with a Near Field Communication (NFC) function enabling the telephone's electronic circuits to communicate wirelessly and without contact with similar devices. , electronic tags, adapted readers, etc.
  • NFC Near Field Communication
  • the telephone is then generally equipped with a communication interface between an antenna and its circuits. This interface is generally referred to as radio frequency head or contactless (contactless) head (CLF).
  • radio frequency head or contactless (contactless) head (CLF).
  • 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 determines the performance of these devices. ci, so the communication and / or energy transfer.
  • One embodiment aims to overcome all or part of the disadvantages of electronic devices equipped with radio frequency communication antenna (s) and / or energy transfer.
  • One embodiment aims to propose a new integration solution of an antenna in an electronic device.
  • One embodiment aims at a solution particularly suitable for an antenna intended to be connected to a radiofrequency communication head of an electronic device.
  • One embodiment is a solution particularly suitable for integrating an antenna into a metallic environment.
  • 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 metal section or plane. which surrounds the plane winding without interruption.
  • the section or metal plane is intended to be connected to ground.
  • the end connected to the section or plane is the outer end of the winding.
  • the plane comprises an opening in which is placed the planar winding.
  • the winding is in an outer diameter of between about 5 and about 20 mm.
  • the center of the winding is in a diameter of between 2 and 5 mm.
  • 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.
  • the opening of the metal plane is intended to receive a camera, a microphone or a brightness sensor.
  • the metal plane is a mobile phone cover.
  • the figure 1 represents schematically and in block form, an example of an electronic device architecture of the type to which the embodiments to 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.
  • 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 position of the antenna in the device is opposite a metal plate (typically an element of a device housing 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.
  • a metal plate typically an element of a device housing 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.
  • the Figure 2A schematically represents the metal plane 5 '.
  • the Figure 2B represents an example of a conductive winding plane constituting the antenna 3.
  • the Figure 2C represents the equivalent electrical diagram of the set.
  • 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.
  • 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 conductive tracks deposited on an insulating layer (not shown) covering, at least partially, the inner face of the plate 5 '.
  • the figure 3 is a schematic representation of an embodiment of an antenna. This figure represents a diagram equivalent to closer to the Figure 2C .
  • the antenna 3 is formed of a planar winding placed in an opening 52 of a metal plane 5.
  • the contour 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.
  • one of the ends, for example the outer end 34, 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.
  • the winding 3 is entirely contained in the opening.
  • the inventor has found that, surprisingly, by electrically connecting one end of the antenna to the ground plane surrounding it, the disturbances due to the eddy currents are considerably reduced and the performance of the antenna is improved. , including whether the opening in which the antenna is placed has a closed contour.
  • the figure 4 represents, schematically and partially, 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, via the matching network 4.
  • This matching network 4 comprises at least one capacitive element in series between each terminal Rx or Tx and the end of the winding to which this terminal is to be connected.
  • capacitors Cs are interposed between terminals Tx and ends 32 and 34 and capacitors Crx are interposed between terminals Rx and ends 32 and 34.
  • a capacitive element Cp generally connects ends 32 and 34 together.
  • 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. Tx terminals at the antenna impedance, and in card or receive mode adapting the impedance to present a resonant circuit having a resonant frequency close to the frequency of the carrier.
  • 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.
  • FIGS 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 plane winding surrounded by a conductive section 5, also circular.
  • the outer end of the winding 3 is connected to the section 5.
  • the Figure 5B illustrates the case of a planar conductive winding 3 of square shape, placed in an opening 52, itself of square shape, made in a metal plane 5.
  • the inner end of the winding 3 is connected to the section 5.
  • the figure 6 represents a variant of an embodiment of 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.
  • the network 4 'then has 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, closer to that of the Figure 2A , a metal hood of an electronic device.
  • 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. figure 7 ) has a closed contour and does not open into one of the edges of the cover 5.
  • 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 included 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 metallic environment around the antenna, it can now be surrounded by a ground plane.
  • 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 whose outer end of the winding is not connected to the ground plane.
  • an antenna made with a connection from one end to a ground plane is formed on the rear face (generally metallic) of a liquid crystal flat screen and connected to the ground thereof.
  • 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.
  • 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.

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 für elektronische vorrichtung Active EP3035439B1 (de)

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 true EP3035439A1 (de) 2016-06-22
EP3035439B1 EP3035439B1 (de) 2020-12-16

Family

ID=52477973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15182376.2A Active EP3035439B1 (de) 2014-12-18 2015-08-25 Antenne für elektronische vorrichtung

Country Status (4)

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

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* Cited by examiner, † Cited by third party
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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

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US20110287715A1 (en) * 2010-05-24 2011-11-24 Tdk Corporation Proximity type antenna and radio communication device
EP2485396A2 (de) * 2011-02-04 2012-08-08 STMicroelectronics (Rousset) SAS Verfahren zum Anschluss einer oder mehreren kontaktlosen Komponenten auf einer einzigen Antenne, und entsprechendes System
WO2014106490A1 (zh) * 2013-01-07 2014-07-10 华为终端有限公司 一种环形天线及相关电子设备

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WO2011095207A1 (en) * 2010-02-03 2011-08-11 Laird Technologies Ab Antenna device and portable electronic device comprising such an antenna device
US20110287715A1 (en) * 2010-05-24 2011-11-24 Tdk Corporation Proximity type antenna and radio communication device
EP2485396A2 (de) * 2011-02-04 2012-08-08 STMicroelectronics (Rousset) SAS Verfahren zum Anschluss einer oder mehreren kontaktlosen Komponenten auf einer einzigen Antenne, und entsprechendes System
WO2014106490A1 (zh) * 2013-01-07 2014-07-10 华为终端有限公司 一种环形天线及相关电子设备

Also Published As

Publication number Publication date
CN205194822U (zh) 2016-04-27
EP3035439B1 (de) 2020-12-16
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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