EP1359638B1 - Antenne imprimée et incorporée dans une appareil de communication électronique portable - Google Patents

Antenne imprimée et incorporée dans une appareil de communication électronique portable Download PDF

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Publication number
EP1359638B1
EP1359638B1 EP02009863A EP02009863A EP1359638B1 EP 1359638 B1 EP1359638 B1 EP 1359638B1 EP 02009863 A EP02009863 A EP 02009863A EP 02009863 A EP02009863 A EP 02009863A EP 1359638 B1 EP1359638 B1 EP 1359638B1
Authority
EP
European Patent Office
Prior art keywords
antenna
pcb
ground plane
pattern
portable electronic
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
EP02009863A
Other languages
German (de)
English (en)
Other versions
EP1359638A1 (fr
Inventor
Kenneth Hakansson
Zhinong Ying
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 EP02009863A priority Critical patent/EP1359638B1/fr
Priority to DE60204943T priority patent/DE60204943T2/de
Priority to AT02009863T priority patent/ATE299298T1/de
Priority to US10/512,710 priority patent/US7081854B2/en
Priority to AU2003233060A priority patent/AU2003233060A1/en
Priority to PCT/EP2003/004298 priority patent/WO2003094289A1/fr
Publication of EP1359638A1 publication Critical patent/EP1359638A1/fr
Application granted granted Critical
Publication of EP1359638B1 publication Critical patent/EP1359638B1/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
    • 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
    • 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
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed 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

Definitions

  • the invention relates to an antenna for use in a portable electronic communication apparatus such as a mobile telephone. More specifically, the invention relates to a built-in antenna comprising a pattern of conductive material, which is printed on the printed circuit board (PCB) of the portable electronic communication apparatus. The invention also relates to a portable electronic communication apparatus comprising such a printed built-in antenna.
  • PCB printed circuit board
  • a portable electronic communication apparatus such as a mobile telephone,requires some sort of antenna in order to establish and maintain a wireless radio link with another unit in the communication system, normally a base station.
  • a base station In the telecommunication industry, the demand for mobile telephones that are small in size, light in weight, and inexpensive to manufacture are continuously present.
  • printed built-in antennas are utilized for mobile telephones within the 300-3000 MHz frequency range.
  • Printed built-in antennas known in the art comprises microstrip patch antennas and planar inverted-F antennas (PIFA).
  • the antenna pattern of the antennas according to the above are printed on a support member separated from the main printed circuit board (PCB) of the mobile telephone. After manufacturing, the antenna can be connected to the PCB by utilizing connectors, such as pogo-pins.
  • PCB printed circuit board
  • EP 1476918 (corresponding to WO03/071629) forms prior art under Article 54(3) EPC.
  • PCB printed circuit board
  • Another object of the invention is to provide a portable electronic apparatus comprising a PCB and a built-in antenna, which can be connected to said PCB without any connectors.
  • the above objects are achieved by providing an antenna adapted to be built-in and used in a portable electronic communication apparatus as set out in claim 1.
  • the antenna pattern and the extended ground plane are positioned with a distance in relation to each other, and form a space, in which low profile electronic components can be positioned.
  • the antenna pattern can be provided to form a multi-port antenna comprising antenna arms having four connections to the circuitry of the PCB.
  • the cost savings in relation the known art will be even bigger.
  • no connectors, such as pogo-pins are needed, the insertion loss is lowered.
  • by providing separate antenna patterns for the Rx and Tx circuits respectively it is possible to connect the antenna to the Rx and Tx circuitry respectively, without having an antenna switch, which will lower the cost of the mobile phone even more.
  • Fig. 1 illustrates a mobile telephone 1 as one example in which the printed built-in antenna according to the invention may be used.
  • the inventive antenna may be used in virtually any other portable electronic communication apparatus, in which a built-in antenna is preferred.
  • the mobile telephone 1 shown in Fig. 1 comprises a loudspeaker 2, a keypad 3, a microphone 4, and a display 5 as is generally known in the art. Further, the mobile telephone 1 comprises the antenna according to the invention, which is built-in into the chassis of the mobile telephone 1.
  • Fig. 2 illustrates a multi-band printed built-in antenna according to a first embodiment of the invention.
  • the antenna comprises a pattern of conductive material printed directly on the main printed circuit board (PCB) 7 of the mobile telephone 1.
  • PCB 7 is shown as ending at the beginning of the antenna pattern.
  • this is only for illustrative purposes.
  • the PCB 7 extends over the full extension of the entire antenna pattern, as the antenna pattern is printed on the PCB 7.
  • the antenna pattern comprises at a first plane a dual-band PIFA (Planar Inverted-F Antenna) antenna having a first arm 8 and a second arm 9, which are resonant in a first and second frequency band, respectively. Also, to provide a third frequency band, at which the antenna is resonant, the antenna pattern comprises a parasitic element 10, which is capacitively coupled to the main PIFA. Further, to provide good radiation characteristics, e.g. directed radiation, and a ground plane under the antenna pattern an extended ground plane 11 is provided at a second plane, essentially parallel to the first plane and opposite the antenna pattern.
  • PIFA Planar Inverted-F Antenna
  • the first and second antenna arms 8, 9 of the conductive pattern are printed directly on a first side of the main PCB 7.
  • the main PCB 7 has a main ground plane, to which the second antenna arm 9 is connected.
  • the first antenna arm 8 is connected to the RF port 13 of the main PCB 7.
  • the connection between the antenna pattern and the patches of the PCB 7 is e.g. provided by connection strips, which provide sufficient connection between the antenna and the RF circuits of the PCB to not have an effect on the antenna tuning such as impedance matching and bandwidth.
  • the RF circuitry will comprise various known HF (high frequency) components and base band components suitable for receiving a frequency signal, filtering the received signal, demodulating the received signal into a baseband signal, filtering the baseband signal further, converting the baseband signal to digital form, applying digital signal processing to the digitized baseband signal (including channel and speech decoding), etc.
  • the HF and baseband components of the radio circuitry will be capable of applying speech and channel encoding to a signal to be transmitted, modulating it onto a carrier wave signal, supplying the resulting HF signal to the antenna, etc.
  • the antenna is designed to have an input impedance of 50 ohm, without any impedance matching circuit.
  • the first antenna arm 8 is designed to be resonant in a first frequency band at around 900 Mhz (GSM), and the second antenna arm 9 is designed to be resonant in a second frequency band at around 1800 Mhz (DCS).
  • GSM 900 Mhz
  • DCS 1800 Mhz
  • the design and tuning of the embodiment in Fig. 2 is only exemplifying, and is not considered to limit the scope of the invention.
  • Other designs of the printed antenna arms are equally well possible within the scope of the invention.
  • the antenna in Fig. 2 comprises the parasitic element 10, which is printed on a second side of the main PCB 7. Therefore, in this embodiment the main PCB is at least a dual-layer PCB.
  • the parasitic element 10 is connected to the ground plane of the PCB 7, by e.g. a connection strip, and capacitively coupled to the main PIFA. Since the main PIFA and the parasitic element 10 are positioned on opposite sides of the PCB 7, the distance between them is the thickness of the PCB.
  • the parasitic element is positioned with a longitudinal displacement opposite the antenna pattern of the first side of the PCB 7 as can be seen in Fig. 2. Also, the length of the parasitic element 10 will effect the natural frequency of said element 10 and the bandwidth of the antenna. The parasitic element 10 widens the bandwidth of the second antenna arm 9, which adds the third frequency band, at which the antenna is resonant. Here, the third frequency band is at around 1900 MHz (PCS). However, the exact design of the parasitic element 10 forms no essential part of the invention. Fig. 2 is only showing an exemplifying embodiment and is not considered to limit the scope of the invention.
  • the antenna is always positioned in the same position every - time. Therefore, the mechanical tolerances involved with the connection of an antenna known in the art to the PCB can be substantially eliminated, which also improves the performance of the antenna. For example, a bad connection between the circuits of the PCB and the antenna will not occur and the antenna pattern will always be positioned in exactly the same position in relation to the signal source.
  • the extended ground plane 11 having a first and second end, respectively, is provided essentially parallel to the PCB, and positioned opposite the antenna pattern at the second side of the PCB 7. This will also provide good radiation characteristics of the antenna, e.g. by directing the radiation in a preferred direction.
  • the size of the extended ground plane 11 is at least as big as the size of the antenna pattern, and the shape of said plane 11 corresponds essentially to the shape of said pattern. A smaller extended ground plane 11 is possible, however it will have a negative effect on the bandwidth of the antenna.
  • the distance between the PCB 7 and the extended ground plane 11 is preferably in the range of 6-10 mm. A smaller distance will decrease the bandwidth of the antenna, and a larger distance is not necessary and will only effect the dimensions of the antenna.
  • the extended ground plane 11 comprises a metal layer mounted on a carrier, such as a piece of dielectric material.
  • a carrier such as a piece of dielectric material.
  • other configurations of conductive material, which can provide a ground plane 11 can be utilized.
  • the material of the extended ground plane 11 should have good reflection properties of electromagnetic radiation, such as copper. This will direct the radiation of the antenna in a preferred direction and the antenna efficiency will increase.
  • the first end of the extended ground plane 11 is connected to the ground plane of the main PCB 7 through a distance portion 12, which will provide sufficient distance between the extended ground plane 11 and the PCB 7.
  • the distance portion 12 will provide connection between the extended ground plane 11 and the ground plane of the PCB 7.
  • a first end of the distance portion 12 is connected to the PCB 7, preferably at the connection point of the parasitic element 10 to the ground plane of the PCB 7, as can be seen in Fig. 2, and is extending substantially orthogonal from the second side of the PCB 7.
  • a second end of the distance portion 12 is connected to the first end of the extended ground plane 11.
  • the distance portion 12 is made of a conductive material, such as copper, for connecting the ground plane of the PCB 7 and the extended ground plane 12. Also, it is possible that the distance portion 12 forms part of the extended ground plane 11, which then is provided e.g. as a bent metal layer.
  • a second conductive layer 14 similar to the first conductive layer of the extended ground plane 11, can as an option be provided substantially parallel to and opposite said first conductive layer of the extended ground plane 11 to form a microwave choke.
  • This second layer 14 is also connected to the second end of the distance portion 12, and consequently to the ground plane of the main PCB 7.
  • the second conductive layer has preferably the same size and form as the first conductive layer and form a slot therewith.
  • the distance between the conductive layers is small, preferably not more than 1 mm.
  • a dielectric member 15 provided, e.g. in form of the support element described above.
  • the first embodiment disclosed in Fig. 2 provides a small and efficient antenna, which is inexpensive to manufacture and provides good radiation characteristics in several frequency bands.
  • a Smith chart and a SWR (standing wave ratio) diagram in Fig. 4 illustrate the performance of a prototype of the antenna in Fig. 2.
  • a SWR diagram illustrates the frequencies at which an antenna is resonating.
  • the SWR diagram of Fig. 4 represents the return loss in dB as a function of frequency.
  • the lower dB values in a SWR diagram the better.
  • a resonance is an area, within which the return loss is low (a high negative value in dB).
  • the antenna according to the invention has good resonating properties in the GSM band at around 880-960 MHz, the DCS band at around 1710-1880 MHz, and the PCS band at around 1850-1990 MHz.
  • the circles represent different frequencies, in which the antenna of Fig. 2 is operating.
  • the horizontal axis represents pure resistance (no reactance). Of particular importance is the point at 50 ⁇ (the middle of the horizontal axis), which normally represents an ideal input impedance.
  • the first embodiment of the antenna is tuned to have an input impedance of 50 ⁇ without any impedance matching circuit.
  • the specific design of - the antenna pattern is not fundamental to the present invention.
  • the design of the antenna pattern is different in each individual case to tune the antenna in a preferred frequency band.
  • a second alternative embodiment of the inventive antenna is disclosed in Fig. 3.
  • the PCB 27 is shown as ending at the beginning of the antenna pattern, as in Fig. 2.
  • this is only for illustrative purposes.
  • the PCB 27 extends over the full extension of the entire antenna pattern, as the antenna pattern is printed on the PCB 27.
  • the built-in printed multi-port antenna comprises in a similar fashion as the multi-band antenna in Fig. 2 an antenna pattern printed on the main PCB 27 of the mobile telephone 1.
  • the antenna pattern of the multi-port antenna comprises different antenna arms for different frequency bands and each Rx and Tx.
  • the multi-port antenna is a dual-band antenna having four multi-port antenna arms 28, 29, 30, 31, i.e. two for the lower frequency band and two for the higher frequency band. In this embodiment no parasitic element is provided. However, the man skilled in the art easily implements this by providing a dual-layer PCB with a parasitic element printed on the PCB 27 opposite the main antenna pattern. Also, the multi-port antenna comprises an extended ground plane 25 having one, or two (not shown), conductive layers similarly to the first embodiment in Fig. 2, connected to the main ground plane of the PCB 27.
  • Each of the multi-port antenna arms 28, 29, 30, 31 are connected to Rx and Tx ports 32, 33, 34, 35, respectively, of the PCB 27 by connection strips, as described above.

Claims (11)

  1. Antenne intégrée pour utilisation dans un appareil (1) électronique portatif de télécommunications, l'antenne comprend un motif d'une matière conductrice imprimé sur une carte à circuit imprimé (PCB) (7 ; 27) comportant un plan de masse, caractérisée par une extension (11 ; 25) de plan de masse comprenant au moins une couche conductrice, qui est raccordée au plan de masse de la PCB (7 ; 27) via une partie (12) d'écartement ayant une première extrémité raccordée au plan de masse de la PCB (7 ; 27) et une seconde extrémité raccordée à la première couche conductrice de l'extension (11 ; 25) de plan de masse, l'extension (11 ; 25) de plan de masse s'étendant pratiquement parallèlement à la PCB (7 ; 27) et en face du motif d'antenne.
  2. Antenne selon la revendication 1, dans laquelle la partie d'écartement s'étend pratiquement orthogonalement par rapport à la PCB (7 ; 27).
  3. Antenne selon la revendication 1 ou 2, dans laquelle la taille de l'extension (11 ; 25) de masse correspond au moins à la taille du motif d'antenne, et la forme de l'extension (11 ; 25) de plan de masse correspond à la forme du motif d'antenne.
  4. Antenne selon l'une quelconque des revendications précédentes, dans laquelle la distance entre la PCB (7 ; 27) et l'extension (11 ; 25) de plan de masse est dans la plage de 6 à 10 mm.
  5. Antenne selon l'une quelconque des revendications précédentes, dans laquelle l'extension (11) de plan de masse comprend une seconde couche conductrice disposée parallèlement et en face d'une première couche conductrice et est raccordée à la seconde extrémité de la partie (12) d'écartement, la taille et la forme de ladite seconde couche correspondent à la taille et à la forme de la première couche conductrice.
  6. Antenne selon la revendication 5, dans laquelle un élément diélectrique (15) ayant une épaisseur qui n'est pas supérieure à 1 mm est placé entre la première et la seconde couche de l'extension (11) de plan de masse.
  7. Antenne selon l'une quelconque des revendications précédentes, dans laquelle la, ou chaque, couche conductrice est faite de métal.
  8. Antenne selon l'une quelconque des revendications précédentes, dans laquelle la partie (12) d'écartement est faite de métal.
  9. Antenne selon l'une quelconque des revendications précédentes, dans laquelle la, ou chaque, couche conductrice et la partie (12) d'écartement sont faites de cuivre.
  10. Appareil électronique portatif de télécommunications pour utilisation dans un système de télécommunications sans fil, comprenant une antenne selon l'une quelconque des revendications précédentes.
  11. Appareil électronique portatif de télécommunications selon la revendication 10, dans lequel l'appareil est un téléphone mobile (1).
EP02009863A 2002-05-02 2002-05-02 Antenne imprimée et incorporée dans une appareil de communication électronique portable Expired - Lifetime EP1359638B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP02009863A EP1359638B1 (fr) 2002-05-02 2002-05-02 Antenne imprimée et incorporée dans une appareil de communication électronique portable
DE60204943T DE60204943T2 (de) 2002-05-02 2002-05-02 Gedrückte, eingebaute Antenne für ein tragbares elektronisches Kommunikationsgerät
AT02009863T ATE299298T1 (de) 2002-05-02 2002-05-02 Gedrückte, eingebaute antenne für ein tragbares elektronisches kommunikationsgerät
US10/512,710 US7081854B2 (en) 2002-05-02 2003-04-25 Printed built-in antenna for use in a portable electronic communication apparatus
AU2003233060A AU2003233060A1 (en) 2002-05-02 2003-04-25 A printed built-in antenna for use in a portable electronic communication apparatus
PCT/EP2003/004298 WO2003094289A1 (fr) 2002-05-02 2003-04-25 Antenne incorporee a circuits imprimes destinee a un appareil de communication electronique portable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02009863A EP1359638B1 (fr) 2002-05-02 2002-05-02 Antenne imprimée et incorporée dans une appareil de communication électronique portable

Publications (2)

Publication Number Publication Date
EP1359638A1 EP1359638A1 (fr) 2003-11-05
EP1359638B1 true EP1359638B1 (fr) 2005-07-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02009863A Expired - Lifetime EP1359638B1 (fr) 2002-05-02 2002-05-02 Antenne imprimée et incorporée dans une appareil de communication électronique portable

Country Status (3)

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EP (1) EP1359638B1 (fr)
AT (1) ATE299298T1 (fr)
DE (1) DE60204943T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100693309B1 (ko) * 2003-12-12 2007-03-13 (주)에이스안테나 다중대역 내장형 안테나
DE602004016012D1 (de) * 2004-12-07 2008-10-02 Sony Ericsson Mobile Comm Ab Antennenvorrichtung
US7639188B2 (en) 2007-04-05 2009-12-29 Sony Ericsson Mobile Communications Ab Radio antenna for a communication terminal

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06334421A (ja) * 1993-05-21 1994-12-02 Mitsubishi Heavy Ind Ltd 基板実装アンテナを有する無線通信製品
GB2303968B (en) * 1995-08-03 1999-11-10 Nokia Mobile Phones Ltd Antenna
FI113212B (fi) * 1997-07-08 2004-03-15 Nokia Corp Usean taajuusalueen kaksoisresonanssiantennirakenne
WO1999028990A1 (fr) * 1997-12-01 1999-06-10 Kabushiki Kaisha Toshiba Antenne de type f inversee pour frequences multiples
FI105061B (fi) * 1998-10-30 2000-05-31 Lk Products Oy Kahden resonanssitaajuuden tasoantenni
EP1026774A3 (fr) * 1999-01-26 2000-08-30 Siemens Aktiengesellschaft Antenne pour terminaux de radiocommunication sans fil
JP3640595B2 (ja) * 2000-05-18 2005-04-20 シャープ株式会社 積層パターンアンテナ及びそれを備えた無線通信装置
AU2001267447A1 (en) * 2000-05-23 2001-12-03 Telefonaktiebolaget Lm Ericsson (Publ) Multi frequency-band antenna
KR100365780B1 (ko) * 2000-09-20 2002-12-26 삼성전자 주식회사 이동통신 단말기의 내장형 단일대역 안테나 구현장치 및휩 안테나 연동방법

Also Published As

Publication number Publication date
DE60204943D1 (de) 2005-08-11
DE60204943T2 (de) 2006-04-20
ATE299298T1 (de) 2005-07-15
EP1359638A1 (fr) 2003-11-05

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