EP1441412B1 - Antenne aver masse distribuée - Google Patents

Antenne aver masse distribuée Download PDF

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Publication number
EP1441412B1
EP1441412B1 EP03001733.9A EP03001733A EP1441412B1 EP 1441412 B1 EP1441412 B1 EP 1441412B1 EP 03001733 A EP03001733 A EP 03001733A EP 1441412 B1 EP1441412 B1 EP 1441412B1
Authority
EP
European Patent Office
Prior art keywords
antenna
ground electrode
spacer
mobile terminal
face
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.)
Expired - Lifetime
Application number
EP03001733.9A
Other languages
German (de)
English (en)
Other versions
EP1441412A1 (fr
Inventor
Hiroki c/o Sony Ercisson Mobile Comm. Int.AB Ito
Osamu c/o Sony Ericsson Mobile Comm. Int Matsuta
Akio c/o Sony Ericsson Mobile Comm. Int Ikushima
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.)
Sony Mobile Communications AB
Original Assignee
Sony Ericsson Mobile Communications AB
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 Sony Ericsson Mobile Communications AB filed Critical Sony Ericsson Mobile Communications AB
Priority to EP03001733.9A priority Critical patent/EP1441412B1/fr
Publication of EP1441412A1 publication Critical patent/EP1441412A1/fr
Application granted granted Critical
Publication of EP1441412B1 publication Critical patent/EP1441412B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01Q1/48—Earthing means; Earth screens; Counterpoises

Definitions

  • the present invention relates to an antenna, in particular to a built-in antenna for use in mobile terminals.
  • the antenna is usually integrated into the casing of the mobile terminal.
  • Various types of built-in antenna concepts are known like e.g. spiral-type antennae, microstrip antennae or others which allow to design an antenna small enough to fit within the casing of a mobile terminal.
  • Technologies allowing to design a thin antenna element, e.g. microstrip, patch, printed dipoles or the like are favoured by many manufacturers of mobile terminals as a respective flat antenna device can be integrated conveniently within the casing of a mobile terminal as for instance indicated with dashed lines in Figure 1 .
  • the radiating part of a respective thin antenna element is hereby usually placed just underneath the back cover of a mobile's casing opposite the key and/or display supporting front side.
  • microstrip is hereby to be seen in the broadest sense covering a thin conductive strip or layer separated from one or more large-surface counter electrodes by a non-conductive volume.
  • the common concept of a microstrip antenna e.g. provides for a radiating component implemented in form of a thin conductive electrode arranged above a counter electrode which is set to ground potential. As the lateral dimensions of the radiating electrode are far bigger than its thickness, a respective type of electrode is usually referred to as a patch.
  • the patch is separated from the counter or ground electrode by a spacer formed of non-conductive material such serving as a dielectric.
  • a conductive strip extending from the patch forms the feeding line of the antenna which may be connected to a transceiver circuitry.
  • the patch may show a planar as well as a curved surface.
  • the lateral dimensions of the patch correspond to a certain part of the possible radio-frequency (RF) wavelengths to be received or transmitted such, that a standing wave condition for the antenna current distribution on the patch is fulfilled.
  • the shape of the patch may hereto resemble a rectangle or also a more complex geometry.
  • the radiation efficiency and the bandwidth of a microstrip antenna are strongly affected by the antenna thickness given by the height or thickness, respectively, of the spacer separating the patch from the ground plate.
  • a use of a thicker spacer results in an improved antenna performance as characterised by a better radiation efficiency combined with a broader bandwidth.
  • a spacer thickness of several millimetres is considered necessary to obtain a sufficient radiation characteristic, which constitutes a requirement that forms a major obstacle in further reducing the thickness of future mobile terminals.
  • an antenna for use in a mobile terminal to transmit and receive radiation of one or more radio-frequency bands as claimed in independent claim 1 enclosed.
  • the antenna has an electrically conductive radiation antenna element which is adapted for being connected to an RF circuitry of the mobile terminal. It further comprises a spacer formed of non-conductive material with a first face supporting the radiation antenna element and a ground electrode, which is adapted to provide a ground potential for the radiation antenna element.
  • the ground electrode is hereby located on the side of the spacer opposite its first face, whereby at least part of the ground electrode is located at a distance from the second face of the spacer opposite its first face.
  • An antenna according to the present invention allows to reduce the volume occupied by the spacer without worsening the antenna performance by simply shifting the ground electrode away from the spacer.
  • the second face of the spacer favourably faces a first surface of a printed wiring board to obtain a compact arrangement of components inside the mobile terminal.
  • the spacer is hereby mounted with its second face onto the first surface of the printed wiring board.
  • At least part of the ground electrode is advantageously formed by an electrically conductive patch supported by a second surface of the printed wiring board located opposite the first surface of the printed wiring board.
  • the effective antenna thickness may also be increased by having at least part of the ground electrode being formed by a shielding component located inside the mobile terminal and by a conductive layer of a display located at the front side of the mobile terminal.
  • FIG. 1 is a representation of a typical state-of-the-art mobile terminal 1 with a built-in microstrip patch antenna 2 indicated by dashed lines for establishing a wireless link to a telecommunication network.
  • the mobile terminal may be optimised for telecommunication purposes as shown, with a display 13, an earpiece 15, and a keypad 14 having functional and numerical keys which may further be used for an input of alphabetic characters.
  • the mobile terminal 1 may also be optimised for other purposes like e.g. with organiser functions and an alpha-numerical keypad to serve as a Personal Digital Assistant (PDA) or for instance with a bigger display and a joystick-like input facility to serve as a game console optimised for wirelessly playing interactive games or the like.
  • PDA Personal Digital Assistant
  • all these different types of mobile terminals are preferably equipped with a built-in microstrip patch antenna such as the one indicated with dashed lines in the example of Figure 1 .
  • a patch antenna As the lateral dimensions of a patch antenna are of the order of a quarter wavelength of an RF-signal to be received or transmitted, respectively, and as its thickness is typically below 1 cm, a patch antenna is flat enough for being placed inside a casing of a conventional mobile terminal 1.
  • the flat design furthermore allows to reduce the portion of the radiation emitted from the antenna into the direction of the front side of the casing by means of very simple shielding mechanisms. But for a sufficient radiation performance, the patch antenna still requires a thickness of typically around 7 mm. This forms a major problem for further reducing the weight and overall size of a mobile terminal 1 as is the common trend, since the common microstrip patch antennae occupies a space within the mobile terminal 1, that cannot be shared with other components therein.
  • FIG. 2 shows an exemplary arrangement of components inside a conventional mobile terminal 1 in a schematic representation.
  • a conventional microstrip patch antenna 2 is typically composed of a radiating thin antenna element 3 implemented in form of a conductive material like e.g. a metal-plating or a conductive epoxy thick film printed on top of a dielectric 5 or the like.
  • the radiating thin antenna element 3 will subsequently be referred to as patch 3.
  • the indication of directions 'top' and 'bottom' used in the ongoing of the description refer to the corresponding directions of the enclosed figures.
  • the patch 3 is connected to an RF-circuit 4 of the mobile terminal 1.
  • a counter electrode 6 is arranged opposite the patch 3 at the bottom face of the dielectric 5.
  • This counter electrode 6 provides a ground potential for the radiating patch antenna element 3 and is therefore also referred to as ground electrode.
  • the ground electrode 6 may be formed on the bottom face of the dielectric 5 by any known kind of plating, deposition, laminating or coating, in a comparable or in a completely different way than the patch antenna element 3.
  • the respective patch antenna 2 is a single piece device with its thickness substantially defined by the thickness of the dielectric 5 used. Since the dielectric 5 separates the patch 3 from the ground electrode 6 by a certain distance defined by its thickness, it will also be referred to as spacer 5.
  • the face of the dielectric supporting the patch 3 of the antenna 2 will be referred to as the first face of the spacer 5, while the spacer's face opposite said first face will be identified as the second face of the spacer.
  • the surface of the printed wiring board (PWB) 8 facing the spacer will be denoted as the first surface of the PWB, and the surface opposite it on the PWB as the respective second surface.
  • a patch antenna 2 is preferably mounted on a main PWB 8 like shown in Figure 2 .
  • the ground electrode 6 is formed by a conductive patch-like layer located on top of the PWB with the dielectric 5 placed with its second face upon it.
  • the total height of the resulting antenna structure is thus given by the thickness of the spacer 5. Due to their film-like character, the contribution of patch 3 and ground electrode 6 to the overall structure height of the antenna can be neglected hereby.
  • a spacer thickness of about 7 mm or more is commonly required for a sufficient antenna performance.
  • the present invention is based on the assumption, that a microstrip patch antenna doesn't have to be implemented in form of a discreet device, but may be built-up with components arranged distributed within the mobile terminal 1.
  • the antenna component which can most easily be placed apart from the rest of the antenna structure has been identified as the ground electrode 6.
  • Shifting the ground electrode 6 away from the second face of the spacer 5 increases the distance between the patch 3 and the ground electrode 6 thus improving the antenna performance. Seen the other way round, without worsening the antenna performance, the thickness of the spacer 5 can be reduced when the ground electrode is at the same time shifted away from the second face of the spacer.
  • FIG. 3 A first embodiment implementing this insight is illustrated in Figure 3 .
  • Part of the ground electrode area is located on the second surface 10 of the PWB 8.
  • the part of the ground electrode 6 on this second surface of the PWB is preferably implemented as a conductive patch-like structure 9.
  • the bottom-side ground electrode element 9 is electrically connected to the parts of the ground electrode remaining on the upper first surface 7 of the PWB 8, e.g. by means of one or more feedthroughs 16 as indicated in Figure 3 .
  • ground electrode arrangement shown in Figure 3 is particularly useful when components of the mobile terminal 1 are sensitive to an electromagnetic field which can build-up between the patch antenna element 3 and the corresponding ground electrode 6. With part of the ground electrode still formed on top of the PWB 8, those components mounted at the bottom face of the PWB or below are protected from the electromagnetic field. But it is clear from the description that alternatively to the representation in Figure 3 , the ground electrode may also be formed exclusively on the second surface 10 of the PWB 8.
  • the antenna thickness is substantially defined by the sum of the thickness of the spacer 5 with the thickness of the PWB 8.
  • the said applies only to the region with the ground electrode 9 built on the bottom side of the PWB 8.
  • the antenna thickness is given by the spacer 5 thickness. Nevertheless a performance improvement is obtained as the effective height of the antenna structure is given by an average according to the relative contribution of each component.
  • FIG. 4 A second embodiment increasing the effective height of the antenna arrangement according to the present invention is illustrated in Figure 4 .
  • a shielding case 17 or are covered by a shield 17.
  • At least an area of one outer surface of such a shield is set to ground potential for the shielding purpose.
  • shields 17 are used to block a passage for radiation instead of protecting components.
  • an outer surfaces of a shielding or shielding case is set to ground potential
  • the respective surface or surfaces can be utilised to further dislodge the ground electrode 6 from the second face of the spacer 5.
  • a respective example is shown in Figure 4 in a schematic representation.
  • a conductive surface of a shield 17 serves as an extension 11 for the ground electrode 6.
  • the antenna thickness at the extension part of the ground electrode is then substantially given by the sum of the thickness of the spacer 5 and PWB together with the distance of the extension 11 from the bottom surface of the PWB.
  • some part of the ground electrode 6 may still remain on the first and/or second surface of the PWB, the effective thickness of the antenna structure is considerably improved thus allowing a further reduction of the spacer thickness.
  • conductive surfaces at or close to the front side of a mobile terminal may be integrated in a ground electrode 6.
  • a display 13 of a mobile terminal has a backside shield 12 which is suited to serve as a ground electrode.
  • the backside shield may be formed by a metal cover, a metallisation or any other known type of electrically conductive layer or foil.
  • the backside shield 12 is generally the most distant contiguous conductive layer usable as a part for a ground electrode 6.
  • the ground electrode 6 may be formed by the backside shield 12 only or by a combination of the shield 12 together with other ground potential layers like e.g. those formed on a shield 11, on the second surface and/or first surface of the PWB 8.
  • the necessary thickness of the spacer 5 can be reduced thus enabling a thinner design of mobile terminals than presently possible.

Claims (3)

  1. Terminal mobile (1), comprenant :
    - une carte de circuits imprimés (8) ;
    - un dispositif d'affichage (13) disposé du côté avant du terminal mobile (1) ; et
    - une antenne (2) pour émettre et recevoir un rayonnement d'une ou de plusieurs bandes de fréquence radio, l'antenne (2) comprenant :
    -- un élément d'antenne à plaque électriquement conducteur (3) adapté de façon à être connecté à des circuits à fréquence radio (4) du terminal mobile (1),
    -- un élément d'espacement (5) constitué en un matériau non conducteur, comportant une première face supportant l'élément d'antenne à plaque (3) et une deuxième face opposée à la première face, et
    -- une électrode de masse (6, 9, 11, 12) adaptée de façon à délivrer un potentiel de masse pour l'élément d'antenne à plaque (3), et disposée sur le côté de l'élément d'espacement (5) opposé à la première face,
    grâce à quoi la deuxième face de l'élément d'espacement (5) fait face à une première surface (7) de la carte de circuits imprimés (8), et
    grâce à quoi au moins une partie de l'électrode de masse (6, 9, 11, 12) est disposée à une certaine distance de la deuxième face de l'élément d'espacement (5), et
    grâce à quoi au moins une partie de l'électrode de masse (6, 9, 11, 12) est constituée par un composant de blindage (11) disposé à l'intérieur du terminal mobile (1) sur le côté opposé de la carte de circuits imprimés (8) par rapport à l'antenne à plaque (3),
    caractérisé en ce que :
    au moins une partie de l'électrode de masse (6, 9, 11, 12) est constituée par une couche conductrice (12) du dispositif d'affichage (13).
  2. Terminal mobile (1) selon la revendication 1,
    caractérisé en ce que :
    l'élément d'espacement (5) est monté avec sa deuxième face sur la première surface (7) de la carte de circuits imprimés (8).
  3. Terminal mobile (1) selon la revendication 1 ou 2,
    caractérisé en ce que :
    une pièce électriquement conductrice (9) supportée par une deuxième surface (10) de la carte de circuits imprimés (8) disposée à l'opposé de la première surface (7) de la carte de circuits imprimés (8) constitue au moins une partie de l'électrode de masse (6, 9, 11, 12).
EP03001733.9A 2003-01-27 2003-01-27 Antenne aver masse distribuée Expired - Lifetime EP1441412B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03001733.9A EP1441412B1 (fr) 2003-01-27 2003-01-27 Antenne aver masse distribuée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03001733.9A EP1441412B1 (fr) 2003-01-27 2003-01-27 Antenne aver masse distribuée

Publications (2)

Publication Number Publication Date
EP1441412A1 EP1441412A1 (fr) 2004-07-28
EP1441412B1 true EP1441412B1 (fr) 2015-12-30

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ID=32524212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03001733.9A Expired - Lifetime EP1441412B1 (fr) 2003-01-27 2003-01-27 Antenne aver masse distribuée

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100696886B1 (ko) 2004-09-17 2007-03-20 삼성전자주식회사 휴대용 무선단말기의 내장형 안테나 장치
WO2006032455A1 (fr) * 2004-09-21 2006-03-30 Fractus, S.A. Plan de sol multiniveau pour un dispositif mobile
EP1810368A1 (fr) 2004-11-12 2007-07-25 Fractus, S.A. Structure d antenne pour un dispositif sans fil avec un plan de sol en forme de boucle
KR100640340B1 (ko) * 2005-05-30 2006-10-30 삼성전자주식회사 내장형 안테나 장치

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07288415A (ja) * 1994-04-18 1995-10-31 Sanyo Electric Co Ltd 小型無線装置
JP3286916B2 (ja) * 1998-08-25 2002-05-27 株式会社村田製作所 アンテナ装置およびそれを用いた通信機
EP1020947A3 (fr) * 1998-12-22 2000-10-04 Nokia Mobile Phones Ltd. Méthode de produuction d'un corps d'antenne pour téléphone et combiné téléphonique comprenant une antenne interne
US6285324B1 (en) * 1999-09-15 2001-09-04 Lucent Technologies Inc. Antenna package for a wireless communications device
EP1763106B1 (fr) * 2000-11-22 2008-12-31 Panasonic Corporation Antenne incorporée pour un appareil de radiotéléphonie
JP2003060422A (ja) * 2001-08-09 2003-02-28 Matsushita Electric Ind Co Ltd ディスプレイ−アンテナ一体型構造体、通信装置

Also Published As

Publication number Publication date
EP1441412A1 (fr) 2004-07-28

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