EP1168491B1 - Antenne pour plusieurs fréquences - Google Patents

Antenne pour plusieurs fréquences Download PDF

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Publication number
EP1168491B1
EP1168491B1 EP00610112A EP00610112A EP1168491B1 EP 1168491 B1 EP1168491 B1 EP 1168491B1 EP 00610112 A EP00610112 A EP 00610112A EP 00610112 A EP00610112 A EP 00610112A EP 1168491 B1 EP1168491 B1 EP 1168491B1
Authority
EP
European Patent Office
Prior art keywords
antenna
conductor portion
band
band portion
frequency band
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
EP00610112A
Other languages
German (de)
English (en)
Other versions
EP1168491A1 (fr
Inventor
Zhinong Ying
Anders DAHLSTRÖM
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson 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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to PCT/EP2001/005618 priority Critical patent/WO2001091233A1/fr
Priority to AU2001267447A priority patent/AU2001267447A1/en
Priority to US09/861,526 priority patent/US6456250B1/en
Publication of EP1168491A1 publication Critical patent/EP1168491A1/fr
Application granted granted Critical
Publication of EP1168491B1 publication Critical patent/EP1168491B1/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
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/005—Patch antenna using one or more coplanar parasitic elements
    • 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
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • 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
    • H01Q5/378—Combination of fed elements with parasitic 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

Definitions

  • the invention relates to antennas for use in portable communications devices such as mobile telephones.
  • Portable communications devices are required to be compact in size, which is a requirement that applies to every component of the devices, including the antenna.
  • Modern mobile telephones use two or more distinct frequency bands, and preferably one and the same antenna is required to operate in all frequency bands used by the telephone.
  • the GSM band centred on the frequency 900 MHz the DSC band centred on 1800 MHz
  • the PCS band centred on 1900 MHz The 900 MHz and 1800 MHz frequency bands are separated by one octave, whereas the 1800 MHz and 1900 MHz frequency bands are separated by only a fraction of one octave.
  • the antenna has separate portions tuned to respective ones of the two frequency bands, since it is not considered feasible to have one and the same portion of the antenna tuned to a frequency band of more than one octave with a relatively large unused frequency band between the useful frequency bands.
  • EP 1 095 422 and WO 00/36 700 describe attempts having been made to have one and the same portion of the antenna cover both high frequency bands centred on 1800 MHz and 1900 MHz with a lower frequency limit of 1710 MHz and an upper frequency limit of 1990 MHz - a bandwidth of 280 MHz. The improvement in bandwidth is obtained at the expense of antenna gain.
  • EP 1 095 422 & WO 00/03452 discloses a printed dual band antenna having a low band portion and a high band portion connected to a common feeding point and a common grounding point according to the preamble of claim 1.
  • EP 942 488 and EP 332 139 both disclose a wide band antenna with two branches capacitively coupled in an end-to-end configuration providing double resonance, which is used for increasing the bandwidth.
  • EP 942 488 and EP 332 139 both disclose a wide band antenna with two branches capacitively coupled in an end-to-end configuration providing double resonance, which is used for increasing the bandwidth.
  • the invention provides an antenna for use in eg portable communications devices such as mobile telephones.
  • the antenna is useful in a low frequency band and two high frequency bands, where the two high frequency bands are relatively closer to each other than to the low frequency band.
  • the antenna is thus effectively a triple band antenna, and a mobile telephone having such an antenna is thus useful in three frequency bands such as the above identified three frequency bands centred on 900 MHz, 1800 MHz and 1900 MHz respectively.
  • the invention is not restricted to the use in the above-identified frequency bands, but will be suitable for use in existing and future frequency bands as well.
  • a printed circuit board PCB with an antenna according to the invention for use in a mobile telephone is shown.
  • the printed circuit board has a rectangular shape, and the invention is not restricted to the use of a rectangular shape.
  • the printed circuit board will have a number of electronic components mounted thereon, which are necessary for the operation of the mobile telephone, but which are not part of the invention. In figure 4 such components are therefore indicated only schematically.
  • an electrically conductive material such as copper, constitutes the antenna of the invention.
  • the antenna is preferably spaced from the printed circuit board PCB with a predetermined distance therebetween.
  • a first conductor portion CP1 which is rectilinear in this embodiment, has a grounding point with a first grounding post GP1 at a first end of the first conductor portion CP1. In use the grounding point will be electrically connected through the first grounding post GP1 to ground potential at the printed circuit board PCB.
  • the first conductor portion CP1 has a feeding point with a feeding post FP electrically connecting the first conductor portion CP1 to an electronic circuit on the PCB for feeding the antenna with signals to be transmitted by the antenna, and/or to electronic circuitry for receiving signals received by the antenna.
  • the portion of the first conductor portion CP1 situated between the feeding post FP and the first grounding post GP1 functions as a matching bridge MB.
  • a low band portion LB branches off at one side of the straight first conductor portion CP1 and forms a spiral.
  • three rectilinear segments forming right angles with each other constitute the low band spiral.
  • the innermost segment in the spiral is wider than the remaining three rectilinear segments including the conductor portion CP1.
  • first high band portion HB1 also forming a spiral, branches off at a right angle and at the same side as the low band portion LB.
  • the first high band spiral is also constituted by three rectilinear segments forming right angles with each other. The segments constituting the first high band spiral have substantially equal widths.
  • the low band portion LB of the antenna is tuned to have a relatively low resonance frequency, such as 900 MHz, and a predefined bandwidth to define a low frequency band of the antenna.
  • the low resonance frequency is mainly determined or influenced by the length of the low band portion LB measured from the feeding point FP to the inner end of the spiral, which length corresponds to one quarter of a wavelength at the low resonance frequency.
  • the first high band portion HB1 of the antenna is tuned to have a first high resonance frequency, such as 1800 MHz, and predefined bandwidth to define a first high frequency band.
  • the first high resonance frequency is mainly determined or influenced by the length of the first high band portion HB1 measured from the feeding point FP to the inner end of the spiral, which length corresponds to one quarter of a wavelength at the first high resonance frequency.
  • the low band portion LB and the first high band portion HB1 of the antenna form a dual band antenna which is usable in mobile telephones operating in two frequency bands such as 900 MHz and 1800 MHz.
  • the antenna also has a second high band portion HB2 in the form of a second conductor portion CP2 arranged in a parallel relationship to the first conductor portion CP1 and at a predetermined distance therefrom.
  • the second high band portion HB2 has a grounding point electrically connected through a second grounding post GP2 to ground potential on the PCB.
  • the second grounding post GP2 is arranged in close vicinity of the feeding post FP, preferably at a distance of 0.5 mm, or at least in the range between 0.1 mm and 1.0 mm.
  • the second high band portion HB2 of the antenna is tuned to have a second high resonance frequency, such as 1900 MHz, and predefined bandwidth to define a second high frequency band.
  • the second high resonance frequency is mainly determined or influenced by the length of the second conductor portion CP2, which corresponds to one quarter of a wavelength at the second high frequency, and the capacitive coupling between the first conductor portion CP1 and the second conductor portion CP2.
  • the first high band portion HB1 of the antenna can be tuned to the higher one of the two high band resonance frequencies - here 1900 MHz, and the second high band portion HB2 of the antenna can be tuned to the lower one of the two high band resonance frequencies - here 1800 MHz.
  • the first high band portion HB1 of the antenna is arranged on one side of the first linear conductor portion CP1, and the second high band portion HB2 of the antenna is arranged on the opposite side of first linear conductor portion CP1.
  • interference between the two high frequency bands is reduced to a minimum.
  • the active portions of the antenna (including the linear conductor portions CP1 and CP2, the low and high band portions LB, HB1 and HB2) are spaced from the printed circuit board PCB.
  • the dielectric substrate DE with physical dimensions and specific dielectric properties selected for the proper functioning of the antenna.
  • the thickness of the dielectric substrate DE is not necessarily the same as the distance separating the active portions of the antenna from the printed circuit board PCB.
  • the active portions of the antenna When used in a mobile telephone, the active portions of the antenna may be placed close to the inner side of a housing wall of the telephone or even fixed or secured thereto, eg by gluing. In such case the dielectric properties of the housing material and their influence on the functioning of the antenna should be taken into account.
  • FIG 5 a typical return loss for a multi frequency band antenna according to the invention.
  • the return loss is here expressed as the voltage standing wave ratio (VSWR) of the antenna drawn on a linear frequency scale from 500 MHz to 2.5 GHz.
  • the return loss has one distinct minimum at a low frequency band and two minima at two high frequency bands HF1 and HF2 relatively close to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
  • Support Of Aerials (AREA)

Claims (12)

  1. Antenne à bande multifréquence comportant
    - une partie de bande basse (LB) accordée sur une bande de basse fréquence (LF), et
    - une première partie de bande haute (HB1) accordée sur une première bande de haute fréquence (HF1) à des fréquences supérieures à celles de la bande de basse fréquence (LF),
    où la partie de bande basse (LB) et la première partie de bande haute (HB1) ont
    - un premier point commun (GP1) de mise à la masse,
    - un point commun (FP) d'alimentation pour la fourniture de signaux d'entrée à l'antenne et pour la sortie de signaux provenant de l'antenne, et
    - une première partie conductrice (CP1) formant une portion de la partie de bande basse (LB) et de la première partie de bande haute (HB1), la première partie conductrice (CP1) étant connectée électriquement au premier point (GP1) de mise à la masse et au point commun (FP) d'alimentation,
    caractérisée en ce que
    - une seconde partie conductrice (CP2) est agencée en parallèle avec la première partie conductrice (CP1) sur un côté opposé de la partie de bande basse (LB) et de la première partie de bande haute (HB1) pour former une seconde partie de bande haute (HB2) ;
    - la seconde partie conductrice (CP2) en est éloignée d'une seconde distance prédéterminée, afin que ladite seconde partie conductrice (CP2) soit en couplage capacitif avec la première partie conductrice (CP1) ;
    - la longueur de la seconde partie conductrice (CP2) est accordée à une seconde bande de haute fréquence (HF2) qui est différente de la première bande de haute fréquence (HF1) et qui correspond à un quart d'une longueur d'onde de ladite seconde bande à haute fréquence (HF2) ; et
    - une première extrémité de la seconde partie conductrice a un point (GP2) de mise à la masse agencé au voisinage étroit du point d'alimentation (FP).
  2. Antenne selon la revendication 1, caractérisée en ce que la première partie conductrice (CP1) et la seconde partie conductrice (CP2) comprennent chacune des parties sensiblement linéaires.
  3. Antenne selon la revendication 1 ou 2, caractérisée en ce que le chevauchement longitudinal s'étend sur une longueur correspondant à un quart d'une longueur d'onde d'une fréquence dans la seconde bande de haute fréquence (HF2).
  4. Antenne selon la revendication 1, caractérisée en ce que chacune de la partie de bande basse (LB) et de la première partie de bande haute (HB1) est configurée sensiblement en une forme de spirale et chacune se dérive de la première partie conductrice sensiblement linéaire (CP1) sur un premier côté de la première partie conductrice (CP1) .
  5. Antenne selon la revendication 4, caractérisée en ce que la seconde partie de bande haute (HB2) est agencée sur un second côté opposé au premier côté de la première partie conductrice (CP1).
  6. Antenne selon la revendication 4, caractérisée en ce que chacune des spirales de la partie de bande basse (LB) et de la première partie de bande haute (HB1) comprend des parties sensiblement linéaires de matière conductrice.
  7. Antenne selon la revendication 6, caractérisée en ce que les parties sensiblement linéaires de matière conductrice sont agencées par paires formant des angles sensiblement droits.
  8. Antenne selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'un support (DE) ayant des propriétés diélectriques prédéterminées supporte l'antenne.
  9. Antenne selon l'une quelconque des revendications 1 à 8, caractérisée en ce que la seconde partie de bande haute (HB2) a un second point (GP2) de mise à la masse agencé au voisinage étroit du point d'alimentation (FP) de l'antenne.
  10. Antenne selon la revendication 9, caractérisée en ce que le point (GP2) de mise à la masse de la seconde partie de bande haute (HB2) est agencé à une distance comprise entre 0,1 mm et 1,0 mm du point d'alimentation (FP) de l'antenne.
  11. Antenne selon la revendication 9, caractérisée en ce que le point (GP2) de mise à la masse de la seconde partie de bande haute (HB2) est agencé à une distance sensiblement de 0,5 mm du point d'alimentation (FP) de l'antenne.
  12. Unité de communications mobiles ayant une antenne selon l'une quelconque des revendications précédentes.
EP00610112A 2000-05-23 2000-11-01 Antenne pour plusieurs fréquences Expired - Lifetime EP1168491B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/EP2001/005618 WO2001091233A1 (fr) 2000-05-23 2001-05-16 Antenne multibande
AU2001267447A AU2001267447A1 (en) 2000-05-23 2001-05-16 Multi frequency-band antenna
US09/861,526 US6456250B1 (en) 2000-05-23 2001-05-22 Multi frequency-band antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK200000820 2000-05-23
DKPA200000820 2000-05-23

Publications (2)

Publication Number Publication Date
EP1168491A1 EP1168491A1 (fr) 2002-01-02
EP1168491B1 true EP1168491B1 (fr) 2007-01-24

Family

ID=8159510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00610112A Expired - Lifetime EP1168491B1 (fr) 2000-05-23 2000-11-01 Antenne pour plusieurs fréquences

Country Status (3)

Country Link
EP (1) EP1168491B1 (fr)
AT (1) ATE352884T1 (fr)
DE (1) DE60033140T2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW490885B (en) 2001-05-25 2002-06-11 Chi Mei Comm Systems Inc Broadband dual-band antenna
EP1263079B1 (fr) * 2001-05-25 2004-07-14 Nokia Corporation Antenne pour téléphone mobile
EP1329985A3 (fr) * 2002-01-18 2004-12-22 Matsushita Electric Industrial Co., Ltd. Dispositif d antenne, appareil de communication et méthode de conception d' un tel dispositif d' antenne
GB2402265A (en) * 2003-04-28 2004-12-01 Itt Mfg Enterprises Inc Tuneable antenna
JP2006287452A (ja) 2005-03-31 2006-10-19 Digital Electronics Corp アンテナ装置および電子機器
TWI271891B (en) 2005-09-19 2007-01-21 High Tech Comp Corp An antenna combining external high-band portion and internal low-band portion
CN1937311A (zh) * 2005-09-23 2007-03-28 宏达国际电子股份有限公司 整合外露式高频与隐藏式低频的天线装置
US7705783B2 (en) 2007-04-06 2010-04-27 Research In Motion Limited Slot-strip antenna apparatus for a radio device operable over multiple frequency bands
GB201122324D0 (en) 2011-12-23 2012-02-01 Univ Edinburgh Antenna element & antenna device comprising such elements
CN113013616A (zh) * 2021-02-24 2021-06-22 Oppo广东移动通信有限公司 天线组件及电子设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0659009B2 (ja) * 1988-03-10 1994-08-03 株式会社豊田中央研究所 移動体用アンテナ
JP3252786B2 (ja) * 1998-02-24 2002-02-04 株式会社村田製作所 アンテナ装置およびそれを用いた無線装置
US6166694A (en) * 1998-07-09 2000-12-26 Telefonaktiebolaget Lm Ericsson (Publ) Printed twin spiral dual band antenna
US6343208B1 (en) * 1998-12-16 2002-01-29 Telefonaktiebolaget Lm Ericsson (Publ) Printed multi-band patch antenna

Also Published As

Publication number Publication date
EP1168491A1 (fr) 2002-01-02
DE60033140T2 (de) 2007-10-31
ATE352884T1 (de) 2007-02-15
DE60033140D1 (de) 2007-03-15

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