EP0642189B1 - Antenna for portable radio apparatus - Google Patents

Antenna for portable radio apparatus Download PDF

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Publication number
EP0642189B1
EP0642189B1 EP19940401711 EP94401711A EP0642189B1 EP 0642189 B1 EP0642189 B1 EP 0642189B1 EP 19940401711 EP19940401711 EP 19940401711 EP 94401711 A EP94401711 A EP 94401711A EP 0642189 B1 EP0642189 B1 EP 0642189B1
Authority
EP
European Patent Office
Prior art keywords
antenna
conductor
edge
face
board
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
EP19940401711
Other languages
German (de)
French (fr)
Other versions
EP0642189A1 (en
Inventor
Jacques Lourdou
Marc Jarreau
Thierry Jacqueminet
Gérard Legeay
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.)
Sagem SA
Original Assignee
Sagem SA
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 SA filed Critical Sagem SA
Publication of EP0642189A1 publication Critical patent/EP0642189A1/en
Application granted granted Critical
Publication of EP0642189B1 publication Critical patent/EP0642189B1/en
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
    • 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
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Description

Comme appareil radio portatif, à portée limitée, on peut par exemple considérer un terminal de radiotéléphonie mobile telle que la radiotéléphonie cellulaire ou la radiotéléphonie de proximité.As a portable radio device with limited range, for example, consider a mobile radio terminal such as the cellular radiotelephony or proximity radiotelephony.

Le terminal comporte un boítier de taille limitée dans lequel un microphone et un écouteur permettent à l'utilisateur de communiquer avec un interlocuteur distant. Un circuit émetteur-récepteur radio relie le microphone et l'écouteur à une antenne du terminal accordée aux fréquences d'émission et de réception.The terminal includes a box of limited size in which a microphone and earphone allow user to communicate with a remote contact. A radio transceiver circuit connects the microphone and earpiece to a terminal antenna tuned to transmit and receive frequencies.

L'antenne d'un terminal de radiotéléphonie se présente souvent sous forme d'un conducteur linéaire relié, par une extrémité, au circuit émetteur-récepteur et qui fait saillie hors du boítier. L'antenne peut toutefois être rétractable pour en limiter l'encombrement au repos.The antenna of a radiotelephony terminal is often present under shape of a linear conductor connected at one end to the circuit transceiver and which protrudes out of the housing. The antenna can however be retractable to limit the size at rest.

Ce type d'antenne présente l'inconvénient d'augmenter sensiblement l'encombrement du terminal et de nécessiter, si tel est le cas, une manoeuvre pour la déployer et la reployer.This type of antenna has the drawback of significantly increasing the size of the terminal and to require, if this is the case, a maneuver to deploy and fold it back.

La présente invention vise à proposer une antenne pour appareil radio portatif, de faible encombrement, et ne nécessitant aucune manoeuvre.The present invention aims to provide an antenna for radio apparatus portable, compact, and requiring no maneuver.

A cet effet, l'invention concerne une antenne pour appareil radio portatif selon la revendication 1.To this end, the invention relates to an antenna for a portable radio device. according to claim 1.

La plaquette de circuit micro-ruban présente un encombrement très limité, ce qui permet de disposer l'antenne en position de fonctionnement et, par exemple, à l'intérieur du boítier de l'appareil radio portatif.The micro-ribbon circuit board has a very limited space requirement, which allows to have the antenna in the operating position and, by example, inside the case of the portable radio device.

On peut ainsi exciter l'un des conducteurs par couplage capacitif à partir de l'autre et optimiser les caractéristiques de l'antenne. One can thus excite one of the conductors by capacitive coupling from on the other and optimize the characteristics of the antenna.

Par FUJIMOTO et al. « Small Antennas 1987, Research Studies Press ; pages 116-151, on connaít une antenne à piste mince sur circuit imprimé.By FUJIMOTO et al. “Small Antennas 1987, Research Studies Press; pages 116-151, there is a thin track antenna on a printed circuit.

On connaít aussi par US-A-3984838 une antenne, mais qui comporte deux éléments rayonnants.We also know from US-A-3984838 an antenna, but which has two radiant elements.

L'invention sera mieux comprise à l'aide de la description suivante de la forme de réalisation préférée de l'antenne de l'invention, en référence au dessin annexé, sur lequel :

  • la figure 1 représente schématiquement l'antenne de l'invention, montée sur un boítier de terminal mobile de radiotéléphonie ;
  • les figures 2 à 10 représentent les faces avant et arrière de diverses formes de réalisation de l'antenne de l'invention et
  • la figure 11 représente la face avant et le côté gauche d'une autre forme de réalisation de l'antenne.
The invention will be better understood using the following description of the preferred embodiment of the antenna of the invention, with reference to the attached drawing, in which:
  • Figure 1 schematically shows the antenna of the invention, mounted on a housing of mobile radio terminal;
  • Figures 2 to 10 show the front and rear faces of various embodiments of the antenna of the invention and
  • FIG. 11 represents the front face and the left side of another embodiment of the antenna.

L'antenne 1 représentée sur la figure 1 est montée à l'extrémité, ici supérieure, d'un boítier 11 d'un terminal mobile de radiotéléphonie et est raccordée à un circuit émetteur-récepteur radio 13.The antenna 1 shown in Figure 1 is mounted at the end, here upper, of a housing 11 of a mobile radiotelephony terminal and is connected to a radio transceiver circuit 13.

L'antenne 1 comporte une tranche, ou plaquette, de circuit micro-ruban (micro-strip), ici à section rectangulaire, constituée d'un isolant 2 et, en bordure, d'une couche, ou bande, d'un conducteur linéaire en micro-ruban 3.The antenna 1 comprises a section, or plate, of micro-ribbon circuit (micro-strip), here of rectangular section, consisting of an insulator 2 and, in border, of a layer, or strip, of a linear conductor in microstrip 3.

Dans cet exemple, la liaison du conducteur 3 avec le circuit radio 13 s'effectue par une métallisation 4 joignant le bord de la plaquette portant le conducteur 3 au bord opposé de fixation à l'extrémité du boítier 11. La plaquette s'étend perpendiculairement à l'extrémité transversale du boítier 11. Une plage de connexion 9, ou pied de l'antenne 1, permet, par un fil, de relier entre l'extrémité libre de la liaison 4 au circuit radio 13.In this example, the connection of the conductor 3 with the radio circuit 13 is carried out by metallization 4 joining the edge of the plate carrying the conductor 3 at the opposite fixing edge at the end of the housing 11. The plate extends perpendicular to the transverse end of the housing 11. A connection pad 9, or foot of the antenna 1, allows, by a wire, to connect between the free end of the link 4 to the radio circuit 13.

Dans cet exemple encore, le boítier 11 est revêtu intérieurement d'une couche métallique 12 formant masse et s'étendant, depuis le pied 9 de l'antenne 1 jusqu'à une interruption, sur une distance sensiblement égale au quart de la longueur d'onde de fonctionnement de l'antenne 1. Cette couche 12 sert de réflecteur et augmente le rendement de l'antenne 1. Au-delà de cette interruption, le boítier peut être revêtu d'une autre couche métallique.In this example again, the housing 11 is internally coated with a metallic layer 12 forming a mass and extending from the foot 9 of antenna 1 until an interruption, over a substantially equal distance at a quarter of the operating wavelength of antenna 1. This layer 12 serves as a reflector and increases the efficiency of antenna 1. Beyond of this interruption, the case can be coated with another layer metallic.

Il est aussi prévu un enrobage isolant 10, représenté sur la figure 1 de façon fragmentaire, recouvrant le boítier 11 et qui se prolonge par une partie massive 10A formant un radôme noyant l'antenne 1 et la protégeant ainsi mécaniquement.An insulating coating 10 is also provided, shown in FIG. 1 of fragmentary, covering the housing 11 and which is extended by a massive part 10A forming a radome drowning the antenna 1 and protecting it so mechanically.

Différentes formes de réalisation de l'antenne de l'invention vont maintenant être décrites.Different embodiments of the antenna of the invention will now be described.

Sur les figures 2 à 11, la plaquette est représentée selon la tranche du circuit micro-strip, en vue avant et en vue arrière. La plaquette comporte une face avant 21, une face arrière 22, ici parallèle à la face avant 21, et deux paires de bords opposés 23, 25 et 24, 26. Le bord 25, de fixation au boítier, porte une couche conductrice, non représentée, formant plan de masse, à travers laquelle est ménagé un passage pour l'excitation de l'antenne.In Figures 2 to 11, the plate is shown along the edge of the micro-strip circuit, in front and rear view. The brochure includes a front face 21, a rear face 22, here parallel to the front face 21, and two pairs of opposite edges 23, 25 and 24, 26. Edge 25, for fixing to the housing, carries a conductive layer, not shown, forming a plane of mass, through which a passage is provided for the excitation of the antenna.

La plaquette, pour fixer les idées, peut avoir 45 millimètres de long et 20 millimètres de large (hauteur de l'antenne). Son épaisseur, mesurée perpendiculairement au plan des figures, peut être de 15 millimètres. Sa fréquence d'accord peut être comprise entre 100 MHz et quelques GHz, par exemple.The plate, to fix ideas, can be 45 millimeters long and 20 millimeters wide (antenna height). Its thickness, measured perpendicular to the plane of the figures, can be 15 millimeters. Her tuning frequency can be between 100 MHz and a few GHz, for example.

Sur la figure 2, le conducteur 3 est imprimé sur la face 21, sur une certaine épaisseur de la plaquette, sans atteindre la face arrière 22, libre de tout conducteur. In FIG. 2, the conductor 3 is printed on the face 21, on a certain thickness of the insert, without reaching the rear face 22, free of all driver.

Le conducteur 3 se poursuit par la liaison 4 imprimée le long du bord 26 et rejoignant au point A le pied 9 situé sur le bord 25, ici approximativement à mi-longueur. Le conducteur 3 se prolonge aussi par une liaison 5, opposée à la liaison 4, imprimée le long du bord 24.The conductor 3 continues with the link 4 printed along the edge 26 and joining at point A foot 9 located on edge 25, here approximately at mid-length. The conductor 3 is also extended by a connection 5, opposite at connection 4, printed along edge 24.

Comme le montre la figure 2, le conducteur 3-5 a une forme d'antenne fouet repliée.As shown in Figure 2, conductor 3-5 has an antenna shape whip folded.

La largeur du conducteur 3, dans le plan de la figure, a été choisie suffisamment grande pour assurer une efficacité suffisante à l'antenne 1.The width of the conductor 3, in the plane of the figure, has been chosen large enough to ensure sufficient efficiency for antenna 1.

Sur la figure 3, la face avant de la plaquette est assez semblable à celle de la figure 2, mais les extrémités A et B du conducteur 3-5 peuvent être reliées à la masse. La face arrière 22 de la plaquette porte un autre conducteur 6, disposé pour coopérer avec le conducteur 3-5.In FIG. 3, the front face of the plate is quite similar to that of Figure 2, but ends A and B of conductor 3-5 can be connected to ground. The rear face 22 of the wafer carries another conductor 6, arranged to cooperate with conductor 3-5.

Le conducteur 6 s'étend en s'élargissant depuis une extrémité C d'excitation, au niveau du bord 25, jusqu'au bord opposé 23.Conductor 6 extends and widens from one end C excitation, at edge 25, to opposite edge 23.

On comprendra que, pour l'antenne 1, l'extrémité d'excitation reçoit un signal d'excitation du circuit radio 13 s'il émet, ou excite ce circuit radio 13 s'il est en réception. Lorsque le conducteur 6 est excité en C, il excite à son tour, par effet capacitif, le conducteur 3-5 qui rayonne alors.It will be understood that, for the antenna 1, the excitation end receives a radio circuit 13 excitation signal if it transmits, or excites this radio circuit 13 if it is in reception. When the conductor 6 is excited at C, it excites at in turn, by capacitive effect, the driver 3-5 which then radiates.

La figure 4 représente un conducteur-antenne sensiblement en forme de T, dont les extrémités de la barre horizontale se prolongent par des liaisons le long des bords 24 et 26 terminées par des extrémités B et C pouvant être mises à la masse. L'excitation est prévue au pied A de la barre centrale verticale 4T du T, sur le bord 25. La face arrière 22 ne comporte aucun conducteur.FIG. 4 represents a substantially T-shaped antenna conductor, whose ends of the horizontal bar are extended by links the along edges 24 and 26 terminated by ends B and C which can be grounded. Excitement is provided at foot A of the central bar vertical 4T of the T, on the edge 25. The rear face 22 has no driver.

Sur la figure 5, la face avant 21 est sensiblement semblable à celle de la figure 4, tandis que la face arrière 22 est pratiquement semblable à celle de la figure 3, son conducteur 6 pouvant être excité par son extrémité D. In FIG. 5, the front face 21 is substantially similar to that of the Figure 4, while the rear face 22 is practically similar to that of Figure 3, its conductor 6 can be excited by its end D.

La figure 6 représente une antenne de type sabre, comportant, sur la face avant 21, des conducteurs le long des bords 23, 26 et, partiellement, 24. Les extrémités B et C des conducteurs sur ces bords peuvent être reliées à la masse. Une liaison d'excitation 7 relie une extrémité A, sur le bord 25, à, sensiblement, la jonction des conducteurs sur les bords 23 et 26. La face arrière 22 est libre de conducteur.FIG. 6 represents a saber type antenna, comprising, on the face before 21, conductors along the edges 23, 26 and, partially, 24. The ends B and C of the conductors on these edges can be connected to the mass. An excitation link 7 connects one end A, on the edge 25, to, substantially, the junction of the conductors on the edges 23 and 26. The face rear 22 is free of driver.

La face avant 21 de l'antenne de la figure 7 est assez semblable à celle de la figure 6, sans la liaison d'excitation 7. La face arrière 22 porte un autre conducteur, d'extrémité C, de forme assez voisine de ceux des figures 3 et 5.The front face 21 of the antenna of FIG. 7 is quite similar to that of Figure 6, without the excitation link 7. The rear face 22 carries another conductor, of end C, of a shape fairly similar to those of FIGS. 3 and 5.

La face avant 21 représentée sur la figure 8 comporte deux conducteurs 8, 8A couplés, formant dipôle, en forme de "n" adjacents et disposés symétriquement par rapport à un axe de symétrie 1A équidistant des bords 24 et 26. L'un, 8, des conducteurs peut être excité par son extrémité B voisine de l'autre conducteur 8A, les trois autres extrémités A, C, D pouvant être mises à la masse.The front face 21 shown in FIG. 8 comprises two conductors 8, 8A coupled, forming a dipole, in the form of adjacent "n" and arranged symmetrically about an axis of symmetry 1A equidistant from the edges 24 and 26. One, 8, of the conductors can be excited by its end B next to the other conductor 8A, the other three ends A, C, D that can be grounded.

La face arrière 22 porte un autre conducteur 8C servant à modifier l'impédance vue par les deux autres conducteurs 8, 8A et ainsi régler la fréquence d'accord.The rear face 22 carries another conductor 8C used to modify the impedance seen by the other two conductors 8, 8A and thus adjust the frequency of agreement.

Sur la figure 9, le conducteur d'extrémités CD de la forme de réalisation de la figure 8 a été reporté sur la face arrière 22, au dos de son emplacement sur la figure 8, et le conducteur 8C a disparu.In FIG. 9, the CD end conductor of the embodiment of Figure 8 has been transferred to the rear face 22, the back of its location in Figure 8, and the conductor 8C has disappeared.

La figure 10 représente une antenne de type sabre assez semblable à celle de la figure 6. Une excroissance C de la liaison d'excitation voisine de l'extrémité d'excitation B permet d'adapter l'antenne, l'extrémité A sur le bord 26 étant mise à la masse. Le long du bord 24 s'étend le prolongement 5 qui est couplé capacitivement à une plage conductrice D imprimée depuis l'arête formée par les bords 24 et 25.Figure 10 shows a saber type antenna quite similar to that in Figure 6. An outgrowth C of the excitation bond close to the excitation end B makes it possible to adapt the antenna, the end A on the edge 26 being grounded. Along the edge 24 extends the extension 5 which is capacitively coupled to a printed conductive pad D from the edge formed by edges 24 and 25.

Sur la figure 11, qui représente la plaquette vue de face et de côté gauche, l'antenne, aussi de type sabre, a sensiblement la forme de celle de la figure 6. Elle comporte, comme le pourrait aussi toutes les autres formes de réalisation précédemment décrites, une plaque conductrice 1C reliée au conducteur 3 et s'étendant sensiblement parallèlement au bord 23 le long duquel s'étend ce conducteur 3, perpendiculairement aux faces 21 et 22. La plaque 1C a pour effet d'accroítre la bande-passante de l'antenne 1.In FIG. 11, which represents the plate seen from the front and from the left side, the antenna, also of saber type, has substantially the shape of that of the figure 6. It includes, as could all other forms of previously described embodiment, a conductive plate 1C connected to the conductor 3 and extending substantially parallel to edge 23 along from which this conductor 3 extends, perpendicular to the faces 21 and 22. The plate 1C has the effect of increasing the bandwidth of the antenna 1.

Il peut être prévu d'enlever du matériau diélectrique afin de modifier les caractéristiques de rayonnement de l'antenne. Il peut aussi être prévu des éléments conducteurs massifs.Provision may be made to remove dielectric material in order to modify the radiation characteristics of the antenna. Provision may also be made massive conductive elements.

Claims (5)

  1. Antenna for a portable radio apparatus, said antenna comprising a linear conductor (3) arranged to be connected to a radio circuit (13), characterised by the fact that said antenna includes a microstrip circuit board carrying a conducting strip, constituting at least partially said conductor (3), which extends over a first face (21) of the board and along a first (23) of its edges opposite a second (25) of its edges, carrying a ground plane and adjacent to said first face (21), and another conductor (6) extends over a second face (22) of the board, parallel to said first face (21) of said conductor (3), to be excited and to excite said conductor (3) by capacitive effect.
  2. Antenna according to claim 1, wherein a conducting link (4, 4T) connects the conductor (3) to said second edge (25) of the board.
  3. Antenna according to claim 2, wherein connecting means (9) are provided to connect to the radio circuit (13) the end of the conducting link (4) situated on said second edge (25).
  4. Antenna according to one of claims 1 to 3, wherein said conductor (3) continues (4) along a third (26) edge of the board.
  5. Antenna according to one of claims 1 to 4, wherein a conducting layer (12) is provided to constitute a reflector plane extending, from a foot (9) of the antenna, over a distance substantially equal to quarter of the operating wavelength of the antenna.
EP19940401711 1993-09-02 1994-07-26 Antenna for portable radio apparatus Expired - Lifetime EP0642189B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9310462 1993-09-02
FR9310462A FR2709604B1 (en) 1993-09-02 1993-09-02 Antenna for portable radio device.

Publications (2)

Publication Number Publication Date
EP0642189A1 EP0642189A1 (en) 1995-03-08
EP0642189B1 true EP0642189B1 (en) 2003-03-05

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Application Number Title Priority Date Filing Date
EP19940401711 Expired - Lifetime EP0642189B1 (en) 1993-09-02 1994-07-26 Antenna for portable radio apparatus

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EP (1) EP0642189B1 (en)
DE (1) DE69432205T2 (en)
FR (1) FR2709604B1 (en)

Cited By (1)

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US7183983B2 (en) 2005-04-26 2007-02-27 Nokia Corporation Dual-layer antenna and method

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FR2727250A1 (en) * 1994-11-22 1996-05-24 Brachat Patrice MONOPOLY BROADBAND ANTENNA IN UNIPLANAR PRINTED TECHNOLOGY AND TRANSMITTING AND / OR RECEIVING DEVICE INCORPORATING SUCH ANTENNA
US5709832A (en) * 1995-06-02 1998-01-20 Ericsson Inc. Method of manufacturing a printed antenna
AU708520B2 (en) * 1995-06-02 1999-08-05 Ericsson Inc. Printed monopole antenna
EP0829112B1 (en) * 1995-06-02 1999-10-06 Ericsson Inc. Multiple band printed monopole antenna
GB9627091D0 (en) * 1996-12-31 1997-02-19 Northern Telecom Ltd An inverted E antenna
DE19822371B4 (en) 1998-05-19 2018-03-08 Ipcom Gmbh & Co. Kg Antenna arrangement and radio
US6239765B1 (en) * 1999-02-27 2001-05-29 Rangestar Wireless, Inc. Asymmetric dipole antenna assembly
US6198442B1 (en) * 1999-07-22 2001-03-06 Ericsson Inc. Multiple frequency band branch antennas for wireless communicators
WO2001009976A1 (en) * 1999-07-29 2001-02-08 Siemens Aktiengesellschaft Radio device with a housing having a hollow body for receiving an antenna element
DE10084893T1 (en) 1999-08-18 2002-10-31 Ericsson Inc Dual Band Butterfly / meander antenna
US6552686B2 (en) * 2001-09-14 2003-04-22 Nokia Corporation Internal multi-band antenna with improved radiation efficiency

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US3984838A (en) * 1975-05-27 1976-10-05 Textron, Inc. Electrically small, double loop low backlobe antenna
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JP2705392B2 (en) * 1991-09-04 1998-01-28 日本電気株式会社 Portable radio

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US7183983B2 (en) 2005-04-26 2007-02-27 Nokia Corporation Dual-layer antenna and method

Also Published As

Publication number Publication date
DE69432205D1 (en) 2003-04-10
FR2709604A1 (en) 1995-03-10
DE69432205T2 (en) 2004-02-12
EP0642189A1 (en) 1995-03-08
FR2709604B1 (en) 1995-10-20

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