EP1305845B9 - Planar radiating surface antenna and portable telephone comprising same - Google Patents

Planar radiating surface antenna and portable telephone comprising same Download PDF

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Publication number
EP1305845B9
EP1305845B9 EP01958206A EP01958206A EP1305845B9 EP 1305845 B9 EP1305845 B9 EP 1305845B9 EP 01958206 A EP01958206 A EP 01958206A EP 01958206 A EP01958206 A EP 01958206A EP 1305845 B9 EP1305845 B9 EP 1305845B9
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EP
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Prior art keywords
antenna
antenna according
ground plane
radiation
reception
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EP01958206A
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German (de)
French (fr)
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EP1305845A1 (en
EP1305845B1 (en
Inventor
François BLANCHO
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Vallaroche SAS
Original Assignee
Sagem Mobiles SA
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Publication of EP1305845B9 publication Critical patent/EP1305845B9/en
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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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • 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
    • H01Q1/12—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
    • H01Q1/245—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 means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • 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
    • 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
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means

Definitions

  • the present invention relates to an antenna of the type with radiating surface (s) plane (s).
  • the invention notably proposes an antenna of this type capable of being used in transmission / reception over at least two frequency bands.
  • planar antennas called PIFA ("Planar Inverted-F Antenna" or flat antenna type F inverted) which include, as illustrated by the figure 1 , a ground plane 1 and a flat conductive surface 2 which is superimposed on this ground plane 1, and extends to the right and parallel thereto.
  • PIFA Planar Inverted-F Antenna
  • 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 object of the invention is to overcome the aforementioned drawbacks and to provide an antenna of the aforementioned type with an optimized gain for different channels in the same resonance band of the antenna.
  • Another object of the invention is also to provide an antenna with at least two transmission / reception bands which is of small size.
  • WO90 / 13152 an antenna structure that has two radiating elements, one that is used for transmission, the other that is used for reception. It is not intended to use a resonant circuit simultaneously over several frequency bands, switching to different sub-bands receiving by switching capacitive or inductive means.
  • the invention proposes a transmitting / receiving antenna according to claim 1.
  • the means defining an adaptation circuit are advantageously connected in parallel with capacitive or inductive means themselves connected in series with means capable of being selectively switched between an on state and a locked state, these capacitive or inductive means shifting the resonance bands of the antenna, depending on whether the means capable of being switched are in the on state or in the off state.
  • the two radiation surfaces are advantageously in the same plane.
  • the antenna is connected to the ground plane and an electronic RF signal supply and reception by two points on either side of a radiating section.
  • the adaptation circuit means are then split on one side and the other of the radiating sections.
  • the invention also relates to a mobile phone which comprises such an antenna.
  • a mobile phone structure comprising a housing in the bottom of which is disposed a ground plane and a loudspeaker electronics, structure in which said ground plane is extended by a shielding piece which has a recess upwards. speaker and which is the ground plane of an antenna of the aforementioned type whose or radiating sections are arranged in the housing on the side of the shielding piece opposite the speaker.
  • the antenna represented on the figure 3 comprises a ground plane 10 and two planar radiating elements 11 and 12 which extend superimposed on said ground plane 10, being parallel thereto and arranged in the same plane.
  • These two elements 11 and 12 are both rectangular sections. They are in this case aligned with each other and have the same width l. Their respective lengths, referenced L1 and L2, may be equal or different.
  • the radiating section 11 is connected on one side to the earth plane (connection point 13) and on the other side to an RF signal supply / reception electronics (connection point 14).
  • the two sections 11 and 12 are connected to each other by at least one circuit which allows the antenna to resonate on two frequency bands centered on the frequencies F1 and F2.
  • a plug circuit behaves substantially as a purely inductive element before its resonant frequency and as a purely capacitive element after its resonant frequency.
  • An assembly of the type shown on the figure 1 therefore operates with two resonance bands, which by varying the dimensions of the radiating sections and the height h, as well as on the values of the components L and C, can be centered on the two resonance frequencies F1 and F2.
  • the antenna that is illustrated on the figure 4 (with differences of scale of representations) takes over all the different elements of the assembly of the figure 3 .
  • a branch which comprises a capacitor C1 connected in series with a controlled switch element D, which in this case is a PIN diode.
  • a similar arrangement is connected in parallel with the plug circuit 18.
  • the two diodes D of these arrangements are controlled by a voltage signal CT transmitted through shock inductors Lc.
  • a protective capacitor C2 is furthermore provided between point 14 and the power supply / reception electronics associated with the antenna.
  • the assembly is equivalent to that of the figure 3 .
  • the plug circuits 17, 18 are modified by the presence of the capacitors C1 connected in parallel thereto, so that the frequencies of the two resonance bands then created are offset with respect to those obtained when the diodes D are blocked.
  • the values of the various components of the assembly which has just been described and in particular the inductive and capacitive values are chosen so that the resonant frequencies F1 and F2 correspond in one case to the "duplex" transmission frequencies.
  • TX curve in solid lines on the figure 5
  • reception frequencies "duplex" f RX dotted line curve on the figure 5 ).
  • the antenna is perfectly resonant for one and the other of the two bands and this both on transmission and on reception.
  • Such an antenna is advantageously integrated with a mobile phone structure, as illustrated on the figure 6 .
  • This mobile phone structure comprises in a housing B a card 19 which is arranged in the vicinity of the front face of the telephone housing and which carries the various keys 20 of the keyboard, control means of the screen 21 of the telephone, as well as means 22 forming a loudspeaker.
  • a metallization 23 which defines the neutral (or mass) of the mobile phone and to which the card 19 and any other cards of the telephone (card 24 on the figure 6 ) are connected.
  • This ground plane 23 is extended by a metal shield 25 which extends with a recess to the right of the means 22 forming a loudspeaker.
  • This metal shield 25 is used to make the ground plane of the antenna, the sections 11 and 12 thereof being arranged on the bottom of the housing B, to the right of the shield 25.
  • the volume occupied by the antenna assembly is minimal, the height h between the shield 25 and the radiating sections 11 and 12 being 8 mm or smaller.
  • a significant advantage of this configuration is that the shield effectively protects the user against electromagnetic radiation emitted by the antenna.

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

Description

La présente invention est relative à une antenne du type à surface(s) rayonnante(s) plane(s).The present invention relates to an antenna of the type with radiating surface (s) plane (s).

L'invention propose notamment une antenne de ce type apte à être utilisée en émission/réception sur au moins deux bandes de fréquences.The invention notably proposes an antenna of this type capable of being used in transmission / reception over at least two frequency bands.

Elle propose également une structure de téléphone portable comportant une telle antenne.It also offers a mobile phone structure comprising such an antenna.

II a déjà été proposé d'utiliser pour les téléphones portables des antennes planes appelées PIFA (« Planar Inverted-F Antenna » ou antenne plane de type F inversée) qui comportent, ainsi que l'illustre la figure 1, un plan de masse 1 et une surface conductrice plane 2 qui est superposée à ce plan de masse 1, et s'étend au droit et parallèlement à celui-ci. Un tel montage a une longueur d'onde de résonance qui est fonction des dimensions de la surface conductrice plane 2 et de la hauteur qui la sépare de son plan de masse 1.It has already been proposed to use for mobile telephones planar antennas called PIFA ("Planar Inverted-F Antenna" or flat antenna type F inverted) which include, as illustrated by the figure 1 , a ground plane 1 and a flat conductive surface 2 which is superimposed on this ground plane 1, and extends to the right 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.

Ces antennes présentent notamment un avantage important en terme d'encombrement.These antennas have a particular advantage in terms of bulk.

Toutefois, une limitation de ces antennes tient en ce que leur largeur de bande passante est d'autant plus restreinte que la hauteur h qui sépare leur surface rayonnante 2 de leur plan de masse 1 est petite.However, a limitation of these antennas is that their bandwidth is all the more restricted as the height h which separates their radiating surface 2 from their ground plane 1 is small.

Ceci empêche en effet de disposer d'un gain optimal sur l'ensemble des canaux utilisés sur une même bande passante.This prevents in fact having an optimal gain on all the channels used on the same bandwidth.

Notamment, on connaît déjà des téléphones portables qui utilisent des antennes du type précité qui comportent deux surfaces rayonnantes qui sont de dimensions différentes et qui sont disposées dans un même plan, au dessus d'un même plan de masse.In particular, we already know mobile phones that use antennas of the aforementioned type which comprise two radiating surfaces which are of different dimensions and which are arranged in the same plane, above the same ground plane.

Ces deux surfaces rayonnantes permettent, ainsi que l'illustre le graphe de la figure 2, de disposer pour l'antenne de deux bandes de fréquences, l'une autour de 900 Mhz, l'autre autour de 1, 8 GHz.These two radiating surfaces allow, as illustrated by the graph of the figure 2 , to have for the antenna two frequency bands, one around 900 MHz, the other around 1, 8 GHz.

Toutefois, l'utilisation d'une séparation "duplex" à l'émission/réception, comme c'est habituellement le cas dans les systèmes GSM, conduit à utiliser pour les fréquences d'émission et de réception fTX, fRX les bords des bandes de résonances de l'antenne, où les adaptations sont peu satisfaisantes.However, the use of a "duplex" separation on transmission / reception, as is usually the case in GSM systems, leads to the use for the transmit and receive frequencies f TX , f RX the edges bands of resonances of the antenna, where the adaptations are unsatisfactory.

PRESENTATION DE L'INVENTIONPRESENTATION OF THE INVENTION

Un but de l'invention est de pallier les inconvénients précités et de proposer une antenne du type précité avec un gain optimisé pour différents canaux dans une même bande de résonance de l'antenne.An object of the invention is to overcome the aforementioned drawbacks and to provide an antenna of the aforementioned type with an optimized gain for different channels in the same resonance band of the antenna.

Un autre but également de l'invention est de proposer une antenne à au moins deux bandes d'émission/réception qui soit d'un encombrement réduit.Another object of the invention is also to provide an antenna with at least two transmission / reception bands which is of small size.

On connaît par WO90/13152 une structure d'antenne qui comporte deux éléments rayonnants, l'un qui est utilisé pour l'émission, l'autre qui est utilisé pour la réception. Il n'est pas prévu d'utiliser un circuit résonant simultanément sur plusieurs bandes de fréquences, le basculement sur différentes sous-bandes de réception se faisant par commutation de moyens capacitifs ou inductifs.We know by WO90 / 13152 an antenna structure that has two radiating elements, one that is used for transmission, the other that is used for reception. It is not intended to use a resonant circuit simultaneously over several frequency bands, switching to different sub-bands receiving by switching capacitive or inductive means.

Il est également connu, par exemple par EP 687 030 , de modifier une fréquence de résonance d'une antenne au moyen d'une capacité commutée par une diode.It is also known, for example by EP 687,030 , to modify a resonance frequency of an antenna by means of a capacitance switched by a diode.

On connaît par ailleurs par EP 892 459 des circuits permettant de basculer d'une bande d'émission à une bande de réception.We also know by EP 892,459 circuits for switching from a transmit band to a receive band.

Ces différentes structures ne permettent pas d'atteindre les buts de l'invention.These different structures do not make it possible to achieve the objects of the invention.

L'invention propose quant à elle une antenne d'émission/réception selon la revendication 1.The invention proposes a transmitting / receiving antenna according to claim 1.

Notamment, les moyens définissant un circuit d'adaptation sont avantageusement montés en parallèle avec des moyens capacitifs ou inductifs eux-mêmes montés en série avec des moyens aptes à être commutés sélectivement entre un état passant et un état bloqué, ces moyens capacitifs ou inductifs décalant les bandes de résonance de l'antenne, selon que les moyens aptes à être commutés sont à l'état passant ou à l'état bloqué.In particular, the means defining an adaptation circuit are advantageously connected in parallel with capacitive or inductive means themselves connected in series with means capable of being selectively switched between an on state and a locked state, these capacitive or inductive means shifting the resonance bands of the antenna, depending on whether the means capable of being switched are in the on state or in the off state.

Les deux surfaces de rayonnement sont avantageusement dans un même plan.The two radiation surfaces are advantageously in the same plane.

En outre, l'antenne est reliée au plan de masse et à une électronique d'alimentation en signaux RF et de réception par deux points de part et d'autre d'une section rayonnante.In addition, the antenna is connected to the ground plane and an electronic RF signal supply and reception by two points on either side of a radiating section.

Les moyens formant circuit d'adaptation sont alors dédoublés d'un côté et de l'autre des sections rayonnantes.The adaptation circuit means are then split on one side and the other of the radiating sections.

L'invention concerne également un téléphone portable qui comporte une telle antenne.The invention also relates to a mobile phone which comprises such an antenna.

Notamment, elle propose une structure de téléphone portable comportant un boîtier dans le fond duquel est disposé un plan de masse et une électronique de haut parleur, structure dans laquelle ledit plan de masse est prolongé par une pièce de blindage qui présente un décrochement vers le haut parleur et qui constitue le plan de masse d'une antenne du type précité dont la ou les sections rayonnantes sont disposées dans le boîtier du côté de la pièce de blindage opposée au haut parleur.In particular, it proposes a mobile phone structure comprising a housing in the bottom of which is disposed a ground plane and a loudspeaker electronics, structure in which said ground plane is extended by a shielding piece which has a recess upwards. speaker and which is the ground plane of an antenna of the aforementioned type whose or radiating sections are arranged in the housing on the side of the shielding piece opposite the speaker.

D'autres caractéristiques et avantages de l'invention ressortiront encore de la description qui suit, laquelle est purement illustrative et non limitative et doit être lue en regard des dessins annexés sur lesquels :

  • la figure 1, déjà discutée, représente schématiquement une antenne de type PIFA conforme à un état de la technique connu ;
  • la figure 2, également déjà discutée, est un graphe adaptation/fréquence illustrant la répartition des fréquences d'émission/réception par rapport aux bandes de fréquences d'une antenne de type PIFA double-bande conforme à un état de la technique connu ;
  • la figure 3 est une représentation schématique en vue de dessus d'une antenne conforme à un mode de réalisation possible de l'invention ;
  • la figure 4 est une représentation schématique en vue de dessus d'une antenne conforme à un mode de réalisation préférentiel de l'invention ;
  • la figure 5 est un graphe similaire à celui de la figure 2 illustrant le fonctionnement d'une antenne du type de celle de la figure 4,
Other features and advantages of the invention will become apparent from the description which follows, which is purely illustrative and nonlimiting and should be read with reference to the accompanying drawings in which:
  • the figure 1 , already discussed, schematically shows a PIFA type antenna according to a known state of the art;
  • the figure 2 , also already discussed, is an adaptation / frequency graph illustrating the distribution of transmission / reception frequencies with respect to frequency bands of a dual-band PIFA antenna according to a known state of the art;
  • the figure 3 is a schematic representation in plan view of an antenna according to a possible embodiment of the invention;
  • the figure 4 is a schematic representation in plan view of an antenna according to a preferred embodiment of the invention;
  • the figure 5 is a graph similar to that of the figure 2 illustrating the operation of an antenna of the type of figure 4 ,

L'antenne représentée sur la figure 3 comporte un plan de masse 10 et deux éléments rayonnants plans 11 et 12 qui s'étendent de façon superposée audit plan de masse 10, en étant parallèles à celui-ci et disposés dans un même plan.The antenna represented on the figure 3 comprises a ground plane 10 and two planar radiating elements 11 and 12 which extend superimposed on said ground plane 10, being parallel thereto and arranged in the same plane.

Ces deux éléments 11 et 12 sont tous deux de sections rectangulaires. Ils sont en l'occurrence alignés l'un par rapport à l'autre et présentent une même largeur l. Leurs longueurs respectives, référencées par L1 et L2, peuvent être égales ou différentes.These two elements 11 and 12 are both rectangular sections. They are in this case aligned with each other and have the same width l. Their respective lengths, referenced L1 and L2, may be equal or different.

Plus précisément, ces deux sections rayonnantes 11 et 12 vérifient sensiblement l'équation suivante : λ 1 4 > h + L 1 + L 2 + l / 2 > λ 2 4

Figure imgb0001

avec λ n = c f n .
Figure imgb0002
 More precisely, these two radiating sections 11 and 12 substantially satisfy the following equation: λ 1 4 > h + The 1 + The 2 + l / 2 > λ 2 4
Figure imgb0001
with λ not = vs f not .
Figure imgb0002

A son extrémité opposée à la section rayonnante 12, la section rayonnante 11 est reliée d'un côté au plan de masse (point de liaison 13) et de l'autre à une électronique d'alimentation/réception des signaux RF (point de liaison 14).At its end opposite to the radiating section 12, the radiating section 11 is connected on one side to the earth plane (connection point 13) and on the other side to an RF signal supply / reception electronics (connection point 14).

Les deux sections 11 et 12 sont reliées l'une à l'autre par au moins un circuit qui permet à l'antenne de résonner sur deux bandes de fréquences centrées sur les fréquences F1 et F2.The two sections 11 and 12 are connected to each other by at least one circuit which allows the antenna to resonate on two frequency bands centered on the frequencies F1 and F2.

Plus précisément, il est prévu deux circuits bouchons LC identiques de part et d'autre de la longueur médiane des deux sections 11 et 12, laquelle peut se comprendre en l'occurrence, compte tenu de la disposition des points 13 et 14, comme une ligne de symétrie pour le montage.More specifically, there are two LC plug circuits identical on both sides of the median length of the two sections 11 and 12, which can be understood in this case, given the arrangement of the points 13 and 14, as a line of symmetry for mounting.

Les valeurs des composants L et C de ces circuits bouchons sont choisies de façon que ces circuits présentent une fréquence de résonance sensiblement au milieu de F1 et F2.The values of the components L and C of these plug circuits are chosen such that these circuits have a resonance frequency substantially in the middle of F1 and F2.

De façon simplifiée, le fonctionnement d'un montage du type de celui qui vient d'être décrit peut se comprendre de la façon suivante.In a simplified manner, the operation of an assembly of the type of that just described can be understood as follows.

On sait qu'un circuit bouchon se comporte sensiblement comme un élément purement inductif avant sa fréquence de résonance et comme un élément purement capacitif après sa fréquence de résonance.It is known that a plug circuit behaves substantially as a purely inductive element before its resonant frequency and as a purely capacitive element after its resonant frequency.

L'introduction d'un circuit bouchon entre les deux sections reviendra compléter celles-ci par - selon que l'on se trouve avant ou après ladite fréquence de résonance - un condensateur ou une inductance d'adaptation. Or, l'ajout d'une inductance à une antenne plane le même effet que si on allongeait celle-ci : on déplace la bande de résonance vers les fréquences basses ; l'ajout d'un condensateur à une antenne plane a quant à lui le même effet que si on raccourcissait celle-ci : on déplace la bande de résonance vers les fréquences hautes.The introduction of a cap circuit between the two sections will complement them by - depending on whether one is before or after said resonant frequency - a capacitor or a matching inductor. Now, the addition of an inductor to an antenna hovers the same effect as if it were lengthened: the resonance band is moved towards the low frequencies; the addition of a capacitor to a planar antenna has the same effect as if it were shortened: one moves the resonance band towards the high frequencies.

Un montage du type de celui représenté sur la figure 1 fonctionne donc avec deux bandes de résonance, qui en jouant sur les dimensions des sections rayonnantes et sur la hauteur h, ainsi que sur les valeurs des composants L et C, peuvent être centrées sur les deux fréquences de résonance F1 et F2.An assembly of the type shown on the figure 1 therefore operates with two resonance bands, which by varying the dimensions of the radiating sections and the height h, as well as on the values of the components L and C, can be centered on the two resonance frequencies F1 and F2.

L'antenne qui est illustrée sur la figure 4 (à des différences d'échelles de représentations près) reprend l'ensemble des différents éléments du montage de la figure 3.The antenna that is illustrated on the figure 4 (with differences of scale of representations) takes over all the different elements of the assembly of the figure 3 .

Elle comporte en outre, montée en parallèle au circuit bouchon 17, une branche qui comporte un condensateur C1 monté en série avec un élément D formant interrupteur commandé, qui en l'occurrence est une diode PIN. Un montage similaire est monté en parallèle au circuit bouchon 18. Les deux diodes D de ces montages sont commandées par un signal de tension CT transmis à travers des inductances de choc Lc.It further comprises, connected in parallel to the plug circuit 17, a branch which comprises a capacitor C1 connected in series with a controlled switch element D, which in this case is a PIN diode. A similar arrangement is connected in parallel with the plug circuit 18. The two diodes D of these arrangements are controlled by a voltage signal CT transmitted through shock inductors Lc.

Un condensateur C2 de protection est par ailleurs prévu entre le point 14 et l'électronique d'alimentation/réception associée à l'antenne.A protective capacitor C2 is furthermore provided between point 14 and the power supply / reception electronics associated with the antenna.

Selon qu'un signal de tension CT est ou non injecté sur l'anode des diodes D, celles-ci sont bloquées ou au contraire passantes.Depending on whether or not a CT voltage signal is injected on the anode of the diodes D, these are blocked or, on the contrary, conductive.

Dans le premier cas, le montage est équivalent à celui de la figure 3.In the first case, the assembly is equivalent to that of the figure 3 .

Dans le deuxième cas, les circuits bouchons 17, 18 se trouvent modifiés par la présence des condensateurs C1 montés en parallèle à celui-ci, de sorte que les fréquences des deux bandes de résonance alors créées sont décalées par rapport à celles obtenues lorsque les diodes D sont bloquées.In the second case, the plug circuits 17, 18 are modified by the presence of the capacitors C1 connected in parallel thereto, so that the frequencies of the two resonance bands then created are offset with respect to those obtained when the diodes D are blocked.

C'est ce qu'illustrent les deux courbes de gain qui sont représentées sur la figure 5.This is illustrated by the two gain curves that are represented on the figure 5 .

Comme on l'aura compris, les valeurs des différents composants du montage qui vient d'être décrit et notamment les valeurs inductives et capacitives sont choisies de façon que les fréquences de résonance F1 et F2 correspondent dans un cas aux fréquences d'émission "duplex" fTX (courbe en traits pleins sur la figure 5) et dans l'autre cas aux fréquences de réception "duplex" fRX (courbe en traits pointillés sur la figure 5).As will be understood, the values of the various components of the assembly which has just been described and in particular the inductive and capacitive values are chosen so that the resonant frequencies F1 and F2 correspond in one case to the "duplex" transmission frequencies. TX (curve in solid lines on the figure 5 ) and in the other case at the reception frequencies "duplex" f RX (dotted line curve on the figure 5 ).

Avec un tel montage, l'antenne est parfaitement résonante pour l'une et l'autre des deux bandes et ce à la fois à l'émission et à la réception.With such an assembly, the antenna is perfectly resonant for one and the other of the two bands and this both on transmission and on reception.

Une telle antenne est avantageusement intégrée à une structure de téléphone portable, de la façon qui est illustrée sur la figure 6.Such an antenna is advantageously integrated with a mobile phone structure, as illustrated on the figure 6 .

Cette structure de téléphone portable comporte dans un boîtier B une carte 19 qui est disposée au voisinage de la face avant du boîtier de téléphone et qui porte les différentes touches 20 du clavier, des moyens de commande de l'écran 21 du téléphone, ainsi que des moyens 22 formant haut parleur.This mobile phone structure comprises in a housing B a card 19 which is arranged in the vicinity of the front face of the telephone housing and which carries the various keys 20 of the keyboard, control means of the screen 21 of the telephone, as well as means 22 forming a loudspeaker.

Dans le fond du boîtier B est disposée une métallisation 23 qui définit le neutre (ou masse) du téléphone portable et à laquelle la carte 19 et les éventuelles autres cartes du téléphone (carte 24 sur la figure 6) sont reliées.In the bottom of the housing B is disposed a metallization 23 which defines the neutral (or mass) of the mobile phone and to which the card 19 and any other cards of the telephone (card 24 on the figure 6 ) are connected.

Ce plan de masse 23 est prolongé par un blindage métallique 25 qui s'étend avec un décrochement au droit des moyens 22 formant haut parleur.This ground plane 23 is extended by a metal shield 25 which extends with a recess to the right of the means 22 forming a loudspeaker.

Ce blindage métallique 25 est utilisé pour réaliser le plan de masse de l'antenne, les sections 11 et 12 de celle-ci étant disposées sur le fond du boîtier B, au droit du blindage 25.This metal shield 25 is used to make the ground plane of the antenna, the sections 11 and 12 thereof being arranged on the bottom of the housing B, to the right of the shield 25.

Avec une telle configuration, le volume occupé par le montage d'antenne est minimal, la hauteur h entre le blindage 25 et les sections rayonnantes 11 et 12 pouvant être de 8 mm ou inférieure.With such a configuration, the volume occupied by the antenna assembly is minimal, the height h between the shield 25 and the radiating sections 11 and 12 being 8 mm or smaller.

En outre, un avantage important de cette configuration tient en ce que le blindage protège de façon efficace l'utilisateur contre les rayonnements électromagnétiques émis par l'antenne.In addition, a significant advantage of this configuration is that the shield effectively protects the user against electromagnetic radiation emitted by the antenna.

Bien entendu, l'invention a été ici décrite dans le cas d'une émission/réception bi-bandes mais pourrait s'appliquer de façon plus générale pour toute émission/réception autour de n fréquences.Of course, the invention has been described here in the case of a two-band transmission / reception but could be applied more generally for any transmission / reception around n frequencies.

En outre, l'invention a été ici décrite dans le cas de surfaces rayonnantes de sections rectangulaires, mais pourrait bien entendu s'appliquer avec des sections rayonnantes présentant d'autres formes.In addition, the invention has been described here in the case of radiating surfaces of rectangular sections, but could of course be applied with radiating sections having other shapes.

Claims (9)

  1. Transmission/reception antenna comprising a ground plane (10) and a radiation surface which extends plumb with said ground plane and parallel thereto, characterized in that the plane radiation surface comprises at least two plane radiation sections (11, 12) interlinked by means defining a matching circuit which allows the antenna to radiate, both in transmission and in reception, on simultaneously at least two different frequency bands centred on frequencies F1 and F2, said means defining a matching circuit comprising at least one stopper circuit (17, 18) exhibiting a resonance frequency substantially in the middle of the frequencies F1 and F2.
  2. Antenna according to Claim 1, characterized in that the means defining a matching circuit (17, 18) are arranged in parallel with capacitive or inductive means themselves arranged in series with means able to be switched selectively between an on state and an off state, these capacitive or inductive means shifting the resonance bands of the antenna, as a function of the on or off state of the means able to be switched.
  3. Antenna according to one of the preceding claims, characterized in that the radiation sections are in one and the same plane.
  4. Antenna according to the preceding claim, characterized in that it is linked to the ground plane and to RF feed/reception electronics by two points on either side of a radiation section.
  5. Antenna according to Claim 4, characterized in that the means defining a matching circuit are split on either side of the radiation sections.
  6. Antenna according to one of Claims 4 or 5, characterized in that the RF feed/reception electronics are linked to the radiation section by a capacitor.
  7. Antenna according to Claim 2 taken alone or in combination with one of Claims 3 to 5, characterized in that the means able to be switched selectively between an on state and an off state comprise at least one PIN diode.
  8. Portable telephone, characterized in that it comprises an antenna according to one of the preceding claims.
  9. Portable telephone comprising a casing in the bottom of which is disposed a ground plane and loudspeaker electronics, characterized in that said ground plane is extended by a screening member which exhibits an indentation toward the loudspeaker and which constitutes the ground plane of an antenna according to one of Claims 1 to 7 whose radiation sections are disposed in the casing alongside the shield member away from the loudspeaker.
EP01958206A 2000-08-01 2001-07-31 Planar radiating surface antenna and portable telephone comprising same Expired - Lifetime EP1305845B9 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0010126 2000-08-01
FR0010126A FR2812766B1 (en) 2000-08-01 2000-08-01 ANTENNA WITH SURFACE (S) RADIANT (S) PLANE (S) AND PORTABLE TELEPHONE COMPRISING SUCH ANTENNA
PCT/FR2001/002498 WO2002011236A1 (en) 2000-08-01 2001-07-31 Planar radiating surface antenna and portable telephone comprising same

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EP1305845A1 EP1305845A1 (en) 2003-05-02
EP1305845B1 EP1305845B1 (en) 2008-12-17
EP1305845B9 true EP1305845B9 (en) 2009-08-05

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US (1) US20030146873A1 (en)
EP (1) EP1305845B9 (en)
JP (1) JP2004505581A (en)
DE (1) DE60137047D1 (en)
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WO (1) WO2002011236A1 (en)

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Also Published As

Publication number Publication date
FR2812766B1 (en) 2006-10-06
EP1305845A1 (en) 2003-05-02
WO2002011236A1 (en) 2002-02-07
FR2812766A1 (en) 2002-02-08
EP1305845B1 (en) 2008-12-17
US20030146873A1 (en) 2003-08-07
JP2004505581A (en) 2004-02-19
DE60137047D1 (en) 2009-01-29

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