EP1689021B1 - FM-Antenne incorporée - Google Patents

FM-Antenne incorporée Download PDF

Info

Publication number
EP1689021B1
EP1689021B1 EP05002488A EP05002488A EP1689021B1 EP 1689021 B1 EP1689021 B1 EP 1689021B1 EP 05002488 A EP05002488 A EP 05002488A EP 05002488 A EP05002488 A EP 05002488A EP 1689021 B1 EP1689021 B1 EP 1689021B1
Authority
EP
European Patent Office
Prior art keywords
antenna element
loop antenna
ground plane
phone
cellular phone
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
EP05002488A
Other languages
German (de)
English (en)
Other versions
EP1689021A1 (fr
Inventor
Kristina Gold
Michael Moser
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 EP05002488A priority Critical patent/EP1689021B1/fr
Priority to DE602005005781T priority patent/DE602005005781D1/de
Priority to AT05002488T priority patent/ATE391348T1/de
Publication of EP1689021A1 publication Critical patent/EP1689021A1/fr
Application granted granted Critical
Publication of EP1689021B1 publication Critical patent/EP1689021B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • 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
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/005—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with variable reactance for tuning the antenna

Definitions

  • the present invention relates to the field of antennas and more particularly to a portable communication device with an antenna provided inside the device.
  • Cellular phones are today provided with more and more functions. Examples of such functions are MP3 players and cameras.
  • the phone then includes a radio receiver, which can be combined with the normal wireless network communication circuits of the phone.
  • the problem that remains to be solved is then that of the antenna.
  • Standard in-built phone antennas used in other areas are normally quarter or half-wavelength antennas. However, such antennas have too big dimensions for being used as internal FM radio antennas.
  • One such known antenna is described in WO-02/27862 . Here a loop antenna element adapted for GPS signal reception is described for use in a phone.
  • EP-1294046 there is provided a meander antenna working as an FM antenna and in WO-2004/0191233 there are provided two parallel conductors working as an FM antenna inside a phone.
  • a number of loop antennas have been used in various areas of technology.
  • FR 2724274 describes a loop antenna that surrounds a shielded box forming ground.
  • GB 2358991 describes an AM antenna in the form of a loop, which can be provided around a display. It also has radio and matching circuits.
  • US 3,918,062 describes a loop antenna spaced from a ground plane.
  • the ground plane is provided at a side wall, perpendicular to a wall on which the loop antenna is provided.
  • the document also describes a parallel resonant circuit connected between a grounding plate and a series resonant circuit.
  • WO 94/19873 describes a loop antenna used as a pager antenna, which may be provided around a display.
  • the electrical dipole antenna is sensitive to changes in the environment. If for instance a user is holding the phone close to his body, the performance of such an antenna is affected in a negative way.
  • An electrical dipole antenna is furthermore sensitive to changes in the size of the ground plane, which can occur because of for instance the connection of accessories to the phone. Also this change in size of the ground plane degrades the performance of the electrical dipole antenna.
  • the present invention is directed towards solving the problem of providing a portable communication device having a main unit with an improved inbuilt antenna, and especially one that is less sensitive to changes in the surrounding area.
  • the object of the present invention is thus to provide a portable communication device having a main unit with an in-built antenna and especially one that is less sensitive to changes in the surrounding area.
  • this object is achieved by a portable communication device according to claim 1.
  • a second aspect of the present invention is directed towards a portable communication device including the features of the first aspect, further comprising an electrical interface to auxiliary units, wherein the electrical interface has a connection to the ground plane.
  • a third aspect of the present invention is directed towards a portable communication device including the features of the fourth aspect, further comprising at least one auxiliary unit connectable to at least the connection to the ground plane of the electrical interface.
  • a fourth aspect of the present invention is directed towards a portable communication device including the features of the first aspect, wherein at least one element of the device is provided inside the loop of the loop antenna element.
  • a fifth aspect of the present invention is directed towards a portable communication device including the features of the first aspect, wherein the loop antenna element has an essentially rectangular shape.
  • An sixth aspect of the present invention is directed towards a portable communication device including the features of the first aspect, wherein the distance between the loop antenna element and the ground plane is at least about 5 mm.
  • a seventh aspect of the present invention is directed towards a portable communication device including the features of the first aspect, wherein the cross section of the loop antenna element has an area in the range of 0.1 - 10 mm 2 .
  • a eighth aspect of the present invention is directed towards a portable communication device including the features of the ninth aspect, wherein the cross section of the loop antenna element has a diameter of approximately 1 mm.
  • the invention has the following advantages. It is not very sensitive to changes of the surrounding area, like changes of the ground plane or objects being close to the main unit. In fact an enlarged ground plane even enhances the antenna efficiency. There is furthermore no need to match any auxiliary units that are connected to the main unit, which is otherwise needed when for instance an ear phone cord is used as antenna.
  • the loop antenna element is furthermore cheap to produce, occupies little space, can be very thin and does not increase the thickness of the main unit.
  • a portable communication device will now be described in relation to a cellular phone.
  • Fig. 1 schematically shows a front view of a cellular phone 10, which is a main unit of the portable communication device according to the invention.
  • the phone 10 includes a keypad 12 and a display 14.
  • the phone is furthermore provided with an electrical interface to auxiliary units in the form of a system connector 16 to which a first auxiliary unit in the form of an ear phone 18 is connected.
  • the ear phone 18 can be provided in a portable hands free device and then be combined with a microphone.
  • the ear phone 18 is connected to the system connector 16 via a cord.
  • the charger 20 is here depicted as being connected to the phone via a cord. It can however also be connected to it in some other way via for instance a desk stand, which desk stand would then be directly connected to the system connector 16.
  • a battery 24 powers the different electrical circuits and components in the phone 10.
  • a loop antenna element 26 which is connected to the circuit board via interconnecting connectors 28.
  • the loop antenna element 26 is provided a distance d above the circuit board, which is at least 5 mm.
  • a radio circuit 30 for reception of radio signals.
  • the radio circuit 30 can be provided in an ASIC circuit which combines a number of functions, like for instance mobile cellular radio communication functions as well as FM radio reception functions.
  • the board 22 also functions as a ground plane for the antenna.
  • One end of the loop antenna element 26 is connected to the radio circuit 30 via a tuning network and another is connected to ground 23.
  • Fig. 3 schematically discloses the loop antenna element 26 and the battery 24 provided on the circuit board 22. Also the system connector 16 is displayed.
  • the loop antenna element 26 is in the shape of a rectangle that encircles the battery 24.
  • the loop antenna element 26 preferably has a circular cross section with an area in the range of 0.1 - 10 mm 2 .
  • the cross-section has furthermore preferably a diameter of about 1 mm. It should however be reallsed that it can have other shapes, like having a rectangular cross section, and other diameters.
  • the loop antenna element 26 is also preferably distanced from the battery 24 with about 1 mm.
  • the positioning of the feeding point of the loop antenna element is not limited to any of the two positions indicated in fig. 3 , but can be placed anywhere along the loop.
  • Fig. 4 shows a block schematic of a number of circuits connected to the loop antenna element 26.
  • the feeding end of the loop antenna element 26 is connected to a notch filter 31.
  • the notch filter 31 comprises an inductor 33 in parallel with a first capacitor 35, the function of the notch filter 31 will be described later.
  • the notch filter 31 is connected to a tuning network 32 that is based on a CC circuit having a second capacitor 34 connected to a third capacitor 36.
  • One end of the second capacitor 36 is here connected to ground 22, while the other end is connected to the second capacitor 34 and to an amplifier 38.
  • the amplifier 38 is in turn connected to an impedance matching circuit 40 comprising a capacitor 42.
  • the impedance matching circuit 40 is furthermore connected to the radio circuit 30.
  • the radio circuit 30 is connected to an ASIC circuit (not shown) providing demodulation and sound and is also connected to the system connector 16 via ground 22.
  • the system connector 16 has three terminals 46, 48, 50, where a first 46 is connected to ground and a second and a third 48 and 50 are intended to be connected to conductors provided in the cord of the ear phone for providing sound from the ASIC circuit.
  • the system connector 16 further comprises a fourth and a fifth terminal 52 and 54 that lead to the battery 24 via two conductors. These terminals 52 and 54 are intended to get connected to a charger for allowing charging of the battery 24.
  • the loop antenna element is set to a radio station broadcast frequency range or frequency band by the tuning network.
  • This tuning network can also be set to be tuned to different transmission frequencies within the band.
  • This network can be fixed to the FM band, which is 88 - 108 MHz, but it is also possible to let it be variable for instance by using a variable capacitance in the CC circuit for allowing other radio transmission frequencies.
  • the received signals are then amplified by the amplifier before being provided to the radio circuit, which can then emit the sound either in a speaker in the device or in the ear phone.
  • the loop antenna element Because of this there is no need for the loop antenna element to have a size that is half of a wavelength of the transmission wavelength, which allows the size reduction of the antenna element so that it fits into the portable communication device.
  • the notch filter has the function of degrading the matching of the tuning network at a certain frequency, which frequency is the frequency of another antenna in the phone provided for transmitting radio signals, like voice communication signals according to a cellular phone communication standard, for instance GSM. In this way it is ensured that such radio communication does not influence the FM radio reception too much.
  • the loop antenna element functions as a magnetic dipole antenna.
  • This type of antenna is not as sensitive to changes in the surrounding area, like changes in the size of the ground plane or changes because of objects being close to the antenna element, like the body of the user of the phone.
  • An electric dipole is on the other hand much sensitive to these changes of the surrounding area.
  • the present invention can be varied in many ways. It is possible to have the loop antenna element have several other types of shapes including being of meandering shape.
  • the loop antenna element can furthermore be provided as a thread, a trace etched onto a flex film be moulded or be of pressed metal. It can also be provided on the inside of the battery cover that is normally used for the battery. It can also be provided as a pattern in the chassis of the phone.
  • the invention was furthermore described in relation to the FM band.
  • the radio circuit need not be provided on the opposite side of the circuit board compared with the loop antenna element. It can just as well be provided on the same side.
  • the tuning network is not limited to the tuning network described, it can have more or fewer components and also for instance include a capacitor the capacitance of which can be varied.
  • the tuning network can apart from being a CC network also be an LC network or any suitable tuning network.
  • the impedance matching network can furthermore be omitted. It is furthermore possible to have other elements than the battery inside the loop.
  • the portable communication device can be provided as only the main unit, which is here a phone, or both the main unit and at least one additional unit, like the ear phone and/or the charger.
  • An auxiliary unit can furthermore be connected to one or more of the terminals of the system connector, but preferably always to the ground potential.
  • the electrical interface described above does not have to be provided in the form of a system connector. Electrical interfaces can just as well be provided as a separate charger connection and ear phone jack, These electrical interfaces do furthermore not have to be provided at the bottom of the phone, but can be provided elsewhere on the phone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Details Of Aerials (AREA)
  • Telephone Set Structure (AREA)

Claims (8)

  1. Téléphone cellulaire comprenant :
    une unité principale (10) comprenant :
    un circuit radio (30) destiné à être connecté à un élément d'antenne ;
    un plan de masse (22) ;
    un élément d'antenne (26) connecté au circuit radio et au plan de masse ; et
    un réseau de syntonisation (32) entre le circuit radio et l'élément d'antenne, conçu pour syntoniser l'antenne sur une gamme de fréquences de diffusion d'une station radio de 88 à 108 MHz ;
    caractérisé en ce que :
    l'élément d'antenne est un élément d'antenne en boucle ;
    la totalité de l'élément d'antenne en boucle est implantée à une distance (d) au-dessus du plan de masse et est substantiellement parallèle à celui-ci ; et
    un filtre à encoche (31), connecté entre l'élément d'antenne en boucle et le réseau de syntonisation et réglé pour dégrader l'adaptation du réseau de syntonisation à une fréquence d'une autre antenne du téléphone, prévue pour l'émission de signaux radio.
  2. Téléphone cellulaire selon la revendication 1, comprenant en outre une interface électrique (16) avec des unités auxiliaires (18, 20), dans lequel l'interface électrique possède une connexion (46) avec le plan de masse.
  3. Téléphone cellulaire selon la revendication 2, comprenant en outre au moins une unité auxiliaire (18, 20) pouvant être connectée à au moins la connexion de l'interface électrique avec le plan de masse.
  4. Téléphone cellulaire selon l'une quelconque des revendications précédentes, dans lequel au moins un élément (24) du dispositif est implanté à l'intérieur de la boucle de l'élément d'antenne en boucle.
  5. Téléphone cellulaire selon l'une quelconque des revendications précédentes, dans lequel l'élément d'antenne en boucle a une forme essentiellement rectangulaire.
  6. Téléphone cellulaire selon l'une quelconque des revendications précédentes, dans lequel la distance entre l'élément d'antenne en boucle et le plan de masse est au moins d'environ 5 mm.
  7. Téléphone cellulaire selon l'une quelconque des revendications précédentes, dans lequel la section transversale de l'élément d'antenne en boucle présente une aire comprise dans la plage de 0,1 à 10 mm2.
  8. Téléphone cellulaire selon la revendication 7, dans lequel la section transversale de l'élément d'antenne en boucle possède un diamètre d'environ 1 mm.
EP05002488A 2005-02-07 2005-02-07 FM-Antenne incorporée Not-in-force EP1689021B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05002488A EP1689021B1 (fr) 2005-02-07 2005-02-07 FM-Antenne incorporée
DE602005005781T DE602005005781D1 (de) 2005-02-07 2005-02-07 Eingebaute FM-Antenne
AT05002488T ATE391348T1 (de) 2005-02-07 2005-02-07 Eingebaute fm-antenne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05002488A EP1689021B1 (fr) 2005-02-07 2005-02-07 FM-Antenne incorporée

Publications (2)

Publication Number Publication Date
EP1689021A1 EP1689021A1 (fr) 2006-08-09
EP1689021B1 true EP1689021B1 (fr) 2008-04-02

Family

ID=34933614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05002488A Not-in-force EP1689021B1 (fr) 2005-02-07 2005-02-07 FM-Antenne incorporée

Country Status (3)

Country Link
EP (1) EP1689021B1 (fr)
AT (1) ATE391348T1 (fr)
DE (1) DE602005005781D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7856259B2 (en) 2007-08-29 2010-12-21 Sony Ericsson Mobile Communications Ab In-built FM antenna
EP2056395A1 (fr) 2007-11-05 2009-05-06 Laird Technologies AB Dispositif d'antenne et dispositif de communication radio portable comportant un tel dispositif d'antenne
CN107275779A (zh) * 2017-06-19 2017-10-20 惠州Tcl移动通信有限公司 移动终端延长地的设置方法及具有延长地的移动终端

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5441192B2 (fr) * 1973-08-01 1979-12-07
CA2117919A1 (fr) * 1993-02-25 1994-09-01 Thomas Eugene Paulick Recepteur a antenne externe camouflee
FR2724274B1 (fr) * 1994-09-07 1996-11-08 Telediffusion Fse Antenne cadre, insensible a l'effet capacitif, et dispositif emetteur recepteur comportant une telle antenne
EP0933832A3 (fr) * 1998-01-30 2001-04-11 Matsushita Electric Industrial Co., Ltd. Antenne incorporée pour terminaux de radiocommunications
GB2358991B (en) * 1999-09-14 2002-02-13 Motorola Inc Wireless radio frequency peripheral interface for a cellular communication device
WO2002027862A1 (fr) * 2000-09-27 2002-04-04 Rangestar Wireless, Inc. Antenne equidirective a polarisation multiple
US7039437B2 (en) * 2001-09-17 2006-05-02 Nokia Corporation Internal broadcast reception system for mobile phones

Also Published As

Publication number Publication date
ATE391348T1 (de) 2008-04-15
EP1689021A1 (fr) 2006-08-09
DE602005005781D1 (de) 2008-05-15

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