EP1548881B1 - Planare Antenne für Mobilfunkgeräte - Google Patents

Planare Antenne für Mobilfunkgeräte Download PDF

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Publication number
EP1548881B1
EP1548881B1 EP20040293082 EP04293082A EP1548881B1 EP 1548881 B1 EP1548881 B1 EP 1548881B1 EP 20040293082 EP20040293082 EP 20040293082 EP 04293082 A EP04293082 A EP 04293082A EP 1548881 B1 EP1548881 B1 EP 1548881B1
Authority
EP
European Patent Office
Prior art keywords
antenna according
partial
antenna
telephone
zone
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.)
Not-in-force
Application number
EP20040293082
Other languages
English (en)
French (fr)
Other versions
EP1548881A1 (de
Inventor
Fernando Romao
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.)
Sagemcom Broadband SAS
Original Assignee
Sagem Communications SAS
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 Sagem Communications SAS filed Critical Sagem Communications SAS
Publication of EP1548881A1 publication Critical patent/EP1548881A1/de
Application granted granted Critical
Publication of EP1548881B1 publication Critical patent/EP1548881B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element

Definitions

  • the present invention relates to an antenna of the type having flat radiating surfaces.
  • the invention proposes in particular an antenna of this type comprising radiating surfaces whose functions of certain parts are able to be reversed according to the conditions of use.
  • PIFA Planar Inverted-F Antenna
  • Flat antenna type F inverted which comprise, as shown in Figure 1, a ground plane 1 and a planar conductive surface 2 which is superimposed on this ground plane 1, and extends straight and parallel thereto.
  • Such an arrangement has a resonance wavelength which is a function of the dimensions of the plane conductive surface 2 and the height which separates it from its ground plane 1.
  • an antenna of this type is easily integrated into a mobile phone 5 having a keyboard 4 and a screen 3.
  • the ground plane 1 is constituted by the printed circuit located inside the housing of the telephone 5, behind the screen 3 and the keyboard 4.
  • the radiating surface 2 is generally placed at the rear of the housing phone 5.
  • this kind of antenna offers good radiation performance, especially in far-field measurement, while locally producing a lower near field than whip antennas or helical antennas also known to those skilled in the art.
  • the radiation lobe 20 on the side of the radiation surface 2 is larger than the lobe 10 on the side of the ground plane 1.
  • the difference between the two lobes 10 and 20 is of the order of about 3 dB.
  • This asymmetry is more or less pronounced depending on the immediate environment of the antenna, namely the presence of metal parts, the dimensions of the mobile, etc.
  • the radiation lobe 20 is larger on the opposite side to the user's head 6 and the lobe 10 is smaller on the side of the head 6 of the user.
  • FIGS. 4B to 4D show use cases in which asymmetry causes problems in the operation of the telephone 5.
  • FIGS 2 to 4D show a one-piece telephone. However, it is understood that the situation is identical for phones with two components or phones “clam" according to the English terminology generally used by those skilled in the art.
  • FIGS. 5A to 5C also illustrate a telephone case 5 with a particular architecture, for example a clam telephone with a 360 ° opening and comprising two flaps referenced 51 and 52.
  • the surface 2 is located in the flap referenced by 52.
  • the flap 51 of the telephone 5 is for example placed on a table 8, the flap 52 being in the closed position on the flap 51.
  • surface 52 is therefore well located with respect to table 8 and the connection of the telephone 5 with the base station of the network is good.
  • Some known techniques propose to solve the problem of poor connection with the base station of the network by positioning two antennas PIFA in the phone, one antenna being located at the front of the phone housing, and another at the back of the housing.
  • Switching means enable one or the other of the antennas to be operated according to the configuration and the position of the telephone.
  • the phone always has a well placed antenna for its transmission / reception.
  • the document EP 1 160999 discloses an antenna that allows switching of certain parts of the antenna, but does not allow control of the radiation front / back of the antenna relative to the housing of the phone.
  • a large constant mass plane is arranged under the all switchable parts.
  • the switchable parts overlap the large ground plane throughout their area.
  • One of the aims of the invention is to propose an antenna and a telephone comprising such an antenna that overcomes at least one of the disadvantages of antennas and telephones of the prior art.
  • One of the aims of the invention is notably to propose an antenna and a telephone which can have a good connection with a base station of the network whatever the configuration of the telephone or its position of use.
  • One of the aims of the invention is, in particular, to propose an antenna and a telephone having a symmetrical behavior with respect to a base station of the network.
  • One of the aims of the invention is to propose a telephone having only one antenna.
  • the invention provides an antenna according to claim 1.
  • the invention thus proposes a transmitting / receiving antenna comprising a ground plane and at least one plane radiation surface, characterized in that it comprises a ground reference partial area, at least two flat surfaces extending in parallel. thereto and switching means electrically connecting the reference partial area to alternately one of the planar surfaces, thereby defining a switching between a first configuration and a second configuration, the first configuration corresponding to a situation in which one of the planar surfaces constitutes the radiation surface, the entire ground plane then comprising the reference partial area and the other flat surface, the second configuration corresponding in turn to a situation in which the radiation surface of the first configuration is electrically connected to the area partial reference to form the plan of mass, the other flat surface then playing the role of radiation surface.
  • the flat surfaces overlap the partial area at most over a negligible area in front of the area of said surfaces.
  • the invention also relates to a telephone comprising such an antenna.
  • the invention has many advantages.
  • the antenna radiates mainly towards the front part or mainly towards the rear part of the telephone case.
  • the antenna shown in FIG. 6A comprises a ground plane 1 and at least a plane radiation surface 2.
  • the antenna more precisely comprises a reference area 60 of mass and at least two plane surfaces 61 and 62 extending parallel to the reference portion 60 of mass.
  • the surface 61 is located in the extension of the zone 60, whereas the surface 62 is remote from the zone 60 in a perpendicular direction.
  • the antenna also comprises switching means 63 electrically connecting the reference partial zone 60 to alternately one of the plane surfaces 61 and 62.
  • the switching means 63 thus define a switching between a first configuration and a second configuration.
  • the first configuration is visible in Figure 6A and corresponds to a situation in which one of the planar surfaces - here the surface 62 - constitutes the radiation surface. It is therefore this surface 62 which in the first configuration defines the frequencies of radiation of the telephone.
  • the whole mass plane 1 then comprises in the first configuration the reference partial zone 60 and the other flat surface, here the surface 61.
  • the means 63 electrically connect the zone 60 and the zone 61 to the electrodes A and B.
  • the means 63 electrically isolate the zone 60 and the zone 62 in this configuration.
  • the second configuration is visible in FIG. 6B and corresponds to a situation in which the radiation surface of the first configuration, namely the surface 62, is electrically connected to the reference partial area 60 to form plane 1 of FIG. whole mass.
  • the electrical junction is located at A 'and B'.
  • the other flat surface 61 now plays the role of radiation surface for the antenna.
  • the surface 61 is then electrically isolated from the zone 60.
  • the radiating surface is, depending on whether the first configuration is selected or the second configuration is selected, either at the front of the housing of a mobile phone in which an antenna according to the invention is placed, or at the rear of the housing .
  • Switching between the two configurations of the antenna is performed to optimize the connection between the phone and the base station of the mobile network to which the phone belongs.
  • the connection with a base station of a telephony network is therefore always optimized, regardless of the position or configuration of the phone.
  • planar surfaces 61 and 62 adapted to be switched to form either a part of the ground plane or the radiating surface are not located in line with the partial area 60 forming the ground plane.
  • the flat surfaces 61 and 62 do not overlap the partial area 60.
  • the flat surfaces 61 and 62 may overlap the partial area 60 over a negligible area in front of their dimension, so that the general behavior of the antenna is not affected and that, depending on the switching, the antenna radiates mostly to the front or mostly to the back of the phone case.
  • the area of overlap of a surface 61 or 62 is less than half the area of each of said surfaces 61 or 62, preferably the area of overlap is between 20 and 0% of the area of each of said surfaces 61 or 62. As has been indicated, very preferably, there is no overlap.
  • the partial zone 60 of mass does not block the radiation of any flat surface whatever the chosen configuration, the partial zone 60 also plays its role of mass in the two possible configurations.
  • the area of the possible zone of overlap is of negligible surface compared to the size of the partial zone 60.
  • FIG. 7 shows another possible arrangement of the surfaces 61 and 62 as well as the zone 60.
  • the zone 60 is disposed behind a screen 3 of a telephone 5.
  • the two flat surfaces 61 and 62 are preferentially, but not necessarily, of the same dimensions, and are located symmetrically with respect to a plane containing the zone 60 of mass reference.
  • the partial ground reference zone 60 is constituted by all or part of a printed circuit capable of being placed in a telephone.
  • the flat surfaces 61 and 62 are metal plates.
  • the switching means 63 are able to form open electrical circuits or closed electrical circuits.
  • the means 63 comprise the junctions 81 to 86 connecting the zone 60 to the two surfaces 61 and 62.
  • the junctions 81 and 82 between the zone 60 and the surface 61 are closed circuits, while the junctions 83 and 84 between the zone 60 and the surface 62 are open circuits.
  • junction 85 for connecting the point of attack 87 to the radiating surface 62 is therefore a closed circuit, while the symmetrical junction with respect to the zone 60 is an open circuit.
  • junctions 81 and 82 between the zone 60 and the surface 61 are open circuits, while the junctions 83 and 84 between the zone 60 and the surface 62 are closed circuits.
  • junction 85 for connecting the point of attack 87 to the radiating surface 61 is therefore a closed circuit, while the junction symmetrical with respect to the zone 60 is an open circuit.
  • the switching means 63 may comprise at least one PIN diode.
  • the switching means 63 may comprise at least one active diode which is less expensive.
  • the switching means 63 may comprise microelectromechanical systems MEMS technology (or "micro-electronic mechanical system” according to the English terminology generally used by those skilled in the art).
  • the microsystems form relays for switching from one configuration of the antenna to another by alternately connecting the surfaces 61 or 62 to the zone 60.
  • the invention applies equally to a monobloc telephone or to a telephone comprising two shutters.
  • the radiated performances of the telephone are improved, whatever the configuration or the position of use of the telephone, and this, thanks to a single antenna.
  • the invention is therefore compact and inexpensive.
  • FIGS. 9A and 9B and 10A and 10B thus show that the radiating surface is always located in the best situation, namely the rear of the housing, for better reception and better reception.
  • FIG. 9A thus shows that when a monobloc telephone is placed on a table, the surface 62 is the radiation surface, whereas my FIG. 9B shows that when the telephone 5 is used at the head 6 of a user, the surface 61 is the radiation surface.
  • FIG. 10A shows that when the flap 52 is above the flap 51, the surface 62 is the radiation surface
  • FIG. 10B shows that when the flap 52 is below the flap 51, the surface 61 becomes the surface of radiation.
  • the radiation surface is not hidden in the phone and is located at the back of the housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Telephone Set Structure (AREA)

Claims (10)

  1. Sende/Empfangs-Antenne, die folgendes umfaßt: eine Masseebene (1) und wenigstens eine ebene Strahlungsfläche (2), eine Massereferenzteilzone (60), wenigstens zwei ebene Flächen (61, 62), die sich parallel zur Teilzone (60) erstrecken, und Umschaltmittel (63), die die Referenzteilzone (60) alternativ elektrisch mit einer (61, 62) der ebenen Flächen verbinden und die damit eine Umschaltung zwischen einer ersten Konfiguration und einer zweiten Konfiguration bereitstellen, wobei die erste Konfiguration einer Situation entspricht, bei der eine der ebenen Flächen (62) die Strahlungsfläche (2) bildet, wobei die vollständige Masseebene (1) dann die Referenzteilzone (60) und die andere ebene Fläche (61) umfaßt, und wobei die zweite Konfiguration ihrerseits einer Situation entspricht, bei der die Strahlungsfläche (62) der ersten Konfiguration elektrisch mit der Referenzteilzone (60) verbunden ist, um die vollständige Masseebene (1) zu bilden, wobei die andere ebene Fläche (61) dann die Rolle der Strahlungsfläche (2) übernimmt, dadurch gekennzeichnet, daß die ebenen Flächen die Teilzone (60) höchstens auf einer Fläche überlappen, die gegenüber dem Flächeninhalt der Flächen (61, 62) vernachlässigbar ist.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, daß die Massereferenzteilzone (60) durch einen Teil einer gedruckten Schaltung oder die ganze gedruckte Schaltung gebildet wird, wobei diese dafür eingerichtet ist, in ein Telefon (5) eingebaut zu werden.
  3. Antenne nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die zwei ebenen Flächen (61, 62) dieselben Abmessungen haben und symmetrisch zu einer Ebene angeordnet sind, die die Massereferenzteilzone (60) enthält.
  4. Antenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die ebenen Flächen (61, 62) metallische Platten sind.
  5. Antenne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Umschaltmittel (63) dafür eingerichtet sind, offene elektrische Stromkreise oder geschlossene elektrische Stromkreise zu bilden.
  6. Antenne nach Anspruch 5, dadurch gekennzeichnet, daß die Umschaltmittel (63) wenigstens eine PIN-Diode umfassen.
  7. Antenne nach Anspruch 5, dadurch gekennzeichnet, daß die Umschaltmittel (63) wenigstens eine aktive Diode umfassen.
  8. Antenne nach Anspruch 5, dadurch gekennzeichnet, daß die Umschaltmittel (63) elektromechanische Mikrosysteme der MEMS-Technologie umfassen.
  9. Telefon (5) in einem Block, dadurch gekennzeichnet, daß es eine Antenne nach einem der vorhergehenden Ansprüche umfaßt.
  10. Telefon (5), das zwei Flügel (51, 52) umfaßt, dadurch gekennzeichnet, daß es eine Antenne nach einem der vorhergehenden Ansprüche umfaßt.
EP20040293082 2003-12-23 2004-12-22 Planare Antenne für Mobilfunkgeräte Not-in-force EP1548881B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0315252 2003-12-23
FR0315252A FR2864352B1 (fr) 2003-12-23 2003-12-23 Attennea surfaces rayonnantes planes et telephone comportant une telle antenne.

Publications (2)

Publication Number Publication Date
EP1548881A1 EP1548881A1 (de) 2005-06-29
EP1548881B1 true EP1548881B1 (de) 2007-10-03

Family

ID=34531333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040293082 Not-in-force EP1548881B1 (de) 2003-12-23 2004-12-22 Planare Antenne für Mobilfunkgeräte

Country Status (4)

Country Link
EP (1) EP1548881B1 (de)
DE (1) DE602004009275T2 (de)
ES (1) ES2291836T3 (de)
FR (1) FR2864352B1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2581444B2 (ja) * 1994-04-28 1997-02-12 日本電気株式会社 複数のアンテナを備える無線装置
EP1160999B1 (de) * 2000-06-03 2010-09-01 IPCom GmbH & Co. KG Antennenanordnung für ein Mobiltelefon

Also Published As

Publication number Publication date
EP1548881A1 (de) 2005-06-29
ES2291836T3 (es) 2008-03-01
FR2864352A1 (fr) 2005-06-24
FR2864352B1 (fr) 2006-08-18
DE602004009275D1 (de) 2007-11-15
DE602004009275T2 (de) 2008-07-24

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