EP1898490B1 - Terminal de communication mobile - Google Patents

Terminal de communication mobile Download PDF

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Publication number
EP1898490B1
EP1898490B1 EP07024685A EP07024685A EP1898490B1 EP 1898490 B1 EP1898490 B1 EP 1898490B1 EP 07024685 A EP07024685 A EP 07024685A EP 07024685 A EP07024685 A EP 07024685A EP 1898490 B1 EP1898490 B1 EP 1898490B1
Authority
EP
European Patent Office
Prior art keywords
antenna
casing
passive antenna
circuit board
mobile 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.)
Expired - Fee Related
Application number
EP07024685A
Other languages
German (de)
English (en)
Other versions
EP1898490A1 (fr
Inventor
Osamu Kozakai
Masatoshi Sawamura
Hideaki Shoji
Hiroyuki Matsumoto
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 Corp
Original Assignee
Sony Ericsson Mobile Communications Japan Inc
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 Japan Inc filed Critical Sony Ericsson Mobile Communications Japan Inc
Publication of EP1898490A1 publication Critical patent/EP1898490A1/fr
Application granted granted Critical
Publication of EP1898490B1 publication Critical patent/EP1898490B1/fr
Expired - Fee Related 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to a mobile communication terminal, particularly to a mobile communication terminal in which an antenna is installed.
  • a mobile phone unit of a folding type in which a casing can be folded.
  • the mobile phone unit of a folding type has an antenna.
  • an unfavorable effect may be given to characteristics of the antenna.
  • EP-A-1 306 922 discloses a folding terminal with active and passive antennas in respective halves.
  • the present invention is to provide the combination of an antenna and a passive element in which characteristics of the antenna are not easily subject to the influence of the length of a circuit board where the antenna and the passive element are disposed.
  • a first aspect of the present invention is a mobile communication terminal comprising: a first casing (10) including a power feeding antenna (16) to which power (17) is supplied and a second casing (20) connected to said first casing, wherein said first casing and said second casing can be folded to be opposed to each other, and said second casing has a passive antenna (26) and a ground potential portion (24), and characterised in that a first connection state between said passive antenna and the ground potential portion (24) is selected if said first casing and said second casing are folded to oppose each other, and a different second connection state between said passive antenna and the ground potential portion (24) is selected if said first casing and said second casing are not folded to oppose each other.
  • a second aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which the power feeding antenna and the passive antenna are electromagnetically coupled when folded.
  • a third aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, in which the first casing has the first circuit board connected to the power feeding antenna, the second casing has the second circuit board in which the passive antenna is provided, and power is supplied between the power feeding antenna and the ground potential of the first circuit board.
  • a fourth aspect of the present invention is the mobile communication terminal according to the first aspect of the present invention, wherein the first and second connection states comprise one selected from the list consisting of: i. an open switch and a closed switch respectively; and ii. a coupling of a first inductance and a coupling of a second inductance respectively.
  • the passive antenna is provided as described above, the deterioration of the antenna characteristics can be controlled to prevent the deterioration of the telephone speech quality of the mobile communication terminal.
  • FIGS. 1A and 1B are views showing a mobile phone unit 1 (mobile communication terminal) according to this embodiment; FIG. 1A is a plan view and FIG. 1B is side section view.
  • a communication frequency band that the mobile phone 1 uses for communication is predetermined in every system.
  • the communication frequency band is from about 0.83GHz to about 0.93GHz, for example.
  • the lower limit of the communication frequency band is called fL (the lower limit frequency)
  • the upper limit thereof is called fH
  • fc the average between the lower limit and upper limit
  • the mobile phone unit 1 includes a first casing 10 and a second casing 20. As shown in FIG. 1A , buttons such as a ten-key are provided in the first casing 10. A display is provided in the second casing 20. The first casing 10 and the second casing 20 are connected by a hinge not shown in the figure. The mobile phone unit 1 can be folded by means of this hinge such that the buttons of the first casing 10 and the display of the second casing 20 are opposed to each other. In FIGS. 1A and 1B , the first casing 10 and the second casing 20 are at an angle of almost 45 degrees, and the mobile phone unit 1 is recognized as being open in such state. The angle made by the first casing 10 and the second casing 20 may not almost exist in some cases.
  • the first casing 10 has a first circuit board 12 and the second casing 20 has a second circuit board 22.
  • the first circuit board 12 and the second circuit board 22 are connected by a circuit board hinge 30. With this, the first circuit board 12 and the second circuit board 22 can change the posture flexibly depending on the folded state of the mobile phone unit 1.
  • FIG. 2 is a plan view showing a state of the first circuit board 12, second circuit board 22 and circuit board hinge 30, when the mobile phone unit 1 is fully opened and the first casing 10 and the second casing 20 face almost in the same direction (when opened).
  • a GND (ground potential) portion 14 a power feeding antenna 16, a power supply portion 17 and a feed point 18 are provided in the first circuit board 12.
  • the GND (ground potential) portion 14 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern.
  • the power feeding antenna 16 is an antenna to which high frequency electric power is supplied.
  • the power supply portion 17 is connected to the GND portion 14 and the power feeding antenna 16 and supplies the high frequency electric power between the ground portion 14 and the power feeding antenna 16.
  • the feed point 18 is a portion at which the power feeding antenna 16 is connected to the first circuit board 12, and the power feeding antenna 16 receives power through the feed point 18.
  • a GND (ground potential) portion 24 and a passive antenna 26 are attached to the second circuit board 22.
  • the GND (ground potential) portion 24 is a portion keeping the ground potential.
  • the portion has almost a rectangular-shaped solid circuit pattern.
  • the passive antenna 26 is an antenna to which power is not supplied.
  • the passive antenna 26 is connected to the ground portion 24.
  • the passive antenna 26 is made to resonate at the lower limit communication frequency fL. Note that the whole length L of the passive antenna 26 may not be ⁇ /4 on condition that the antenna resonates at the lower limit communication frequency.
  • the passive antenna 26 can be provided on the second circuit board 22 instead of being attached to the outside of the second circuit board 22.
  • the modified examples are shown in FIGS. 3A to 3D .
  • the passive antenna 26 may have the circuit pattern of the shape of meanders. As shown in FIG. 3B , the passive antenna 26 may have the circuit pattern of an approximately straight shape in which the long side portion is considerably longer than the short side portion. Further, the passive antenna 26 may not be the circuit pattern and may be a wire as shown in FIG. 3C and may be a metal plate as shown in FIG. 3D .
  • the passive antenna 26 is made to resonate at the lower limit communication frequency fL by adjusting the whole length L of the passive antenna 26.
  • a circuit chip 25 may be connected to the passive antenna 26 and the GND portion 24 to make the passive antenna 26 resonate at the lower limit communication frequency fL.
  • FIGS. 5A and 5B show a state of the first circuit 12, second circuit 22 and circuit board hinge 30, when the mobile phone unit 1 is folded and the first casing 10 and the second casing 20 oppose to each other;
  • FIG. 5A is a side view and
  • FIG. 5B is a plan view.
  • the power feeding antenna 16 opposes to the passive antenna 26. Further, the power feeding antenna 16 is positioned at the back of the passive antenna 26 shown in FIG. 5B , and the power feeding antenna 16 opposes to the passive antenna 26. Accordingly, the power feeding antenna 16 and the passive antenna 26 are electromagnetically coupled.
  • FIGS. 6A and 6B show a comparative example to be compared with a practice example of the exemplary embodiment; FIG. 6A is a plan view and FIG. 6B shows the antenna radiation efficiency.
  • the comparative example has no passive antenna 26.
  • FIG. 8 shows the antenna radiation efficiency of a passive antenna 26 in the communication frequency band, in each of the cases where the resonance frequency thereof is a lower limit fL (lower limit communication frequency), is an upper limit fH and is an average fc of the lower limit and upper limit.
  • the antenna radiation efficiency becomes particularly low around the lower limit fL in the communication frequency band, when the resonance frequency of the passive antenna 26 is fH and fc, which is not favorable.
  • the antenna radiation efficiency becomes excellent over the whole of the desired band, when the resonance frequency of the passive antenna 26 is fL, which is favorable.
  • the passive antenna 26 is provided in the second circuit board 22 and the resonance frequency of the passive antenna 26 is fL, the antenna radiation efficiency becomes excellent over the whole of the desired band and the desirable effectiveness can be obtained.
  • FIGS. 10A and 10B directions are defined as shown in FIG. 9 and the antenna radiation pattern in the comparative example is shown in FIGS. 10A and 10B .
  • the radiation pattern from the minute current element is a sine curve, and originally, the direction of maximum radiation is the side directions (90', 270') and should become symmetrical with the top and bottom (the directions of 0' and 180').
  • the antenna radiation pattern becomes desirable regardless of the whole length H of the circuit board.
  • the antenna radiation efficiency when the mobile phone unit 1 is folded is shown in FIG. 12 .
  • the antenna radiation efficiency of the practice example 1 is higher than that of the comparative example in the desired band.
  • FIGS. 13 to 20 Since the embodiment is also applied to the folding type mobile phone unit 1 (the mobile communication terminal) similarly to the first exemplary embodiment, the same reference numerals are given to the same members as those in the mobile phone unit 1 explained in the exemplary embodiment and the detailed explanation is omitted.
  • FIG. 13 is a drawing of a mobile phone unit (mobile communication terminal) 1 according to this embodiment of the present invention and is a plan view showing a state of a first circuit board 12, second circuit board 22 and circuit board hinge 30, when the mobile phone unit 1 is fully opened and a first casing 10 and a second casing 20 face almost in the same direction (when opened).
  • a GND (ground potential) portion 14 a power feeding antenna 16, a power supply portion 17 and a feed point 18 are provided in the first circuit board 12.
  • the GND (ground potential) portion 14 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern.
  • the power feeding antenna 16 is an antenna to which the high frequency electric power is supplied.
  • the power supply portion 17 is connected to the ground portion 14 and the power feeding antenna 16 and supplies the high frequency electric power between the power feeding antenna 16 and the GND portion 14.
  • the feed point 18 is a portion at which the power feeding antenna 16 is connected to the first circuit board 12, and the power feeding antenna 16 receives power through the feed point 18.
  • the second circuit board 22 has a GND (ground potential) portion 24, and a passive antenna 26 is attached to the GND portion 24 through a switch 27.
  • GND ground potential
  • the GND (ground potential) portion 24 is a portion keeping the ground potential. For example, the portion has almost a rectangular-shaped solid circuit pattern.
  • the passive antenna 26 is an antenna to which power is not supplied. The passive antenna 26 is connected to the GND portion 24 through the switch 27.
  • the switch 27 is switched between when the mobile phone unit 1 is fully opened and the first casing 10 and the second casing 20 are opened and when the first casing 10 and the second casing 20 are closed, for example.
  • the switching of this switch is performed by the control of a control portion (not shown in the figure) which detects the states of the opening and closing of the mobile phone unit 1, for example.
  • a switch changed mechanically in accordance with the opening and closing operations of the mobile phone unit 1 may be used.
  • the passive antenna 26 may be provided on the second circuit board 22 instead of being attached to the outside of the second circuit board 22 and may have various shapes as shown in FIGS. 3A to 3D , for example.
  • circuit components made of chip components and the like may be attached.
  • a coil 41a (this coil 41a has the inductance value of 33nH or 30nH, for example) is connected between the GND portion 24 and the passive antenna 26, when the switch 27 is closed. Further, the passive antenna 26 is made not to connect to the coil 41a and the GND portion 24, when the switch is opened.
  • a switch connected to the passive antenna 26 is provided as a switch 27' which can be switched from one side to the other side, and a coil 41a is connected between the GND portion 24 and the passive antenna 26 when the switch changes to one side, and a coil 41b is connected between the GND portion 24 and the passive antenna 26 when the switch changes to the other side.
  • the coil 41a has the inductance value of 33nH, for example, and the coil 41b has the inductance value of 30nH, for example.
  • the inductance components formed of a chip component are used as the coils 41a and 41b.
  • FIGS. 15A and 15B and FIGS. 16A and 16B are drawings which show an example of a state of the passive antenna 26 when the mobile phone unit 1 is opened ( FIGS. 15A and 15B ), and show an example of a state of the passive antenna 26 when the mobile phone unit 1 is closed ( FIGS. 16A and 16B ), in the case where the connection configuration shown in FIG. 14A is employed.
  • the switch 27 When the mobile phone unit 1 is opened as shown in FIG. 15A , the switch 27 is in an open state as shown in FIG. 15B and the passive antenna 26 is in a state of being separated from the coil 41a and the GND 24 (that is, a state of being separated from the circuit board inside the second casing 20).
  • the switch 27 When the mobile phone unit 1 is closed as shown in FIG. 16A , the switch 27 is in a closed state as shown in FIG 16B and the passive antenna 26 is in a state of being connected to the GND portion 24 through the coil 41a.
  • FIGS. 17A and 17B and FIGS. 18A and 18B are drawings which show an example of a state of the passive antenna 26 when the mobile phone unit 1 is opened ( FIGS. 17A and 17B ), and show an example of a state of the passive antenna 26 when the mobile phone unit 1 is closed ( FIGS. 18A and 18B ), in the case where the connection configuration shown in FIG. 14B is employed.
  • the switch 27' When the mobile phone unit 1 is opened as shown in FIG. 17A , the switch 27' is in a state of being connected to one side as shown in FIG. 17B and the passive antenna 26 is in a state of being connected to the GND portion 24 through the coil 41a.
  • the switch 27' When the mobile phone unit 1 is closed as shown in FIG. 18A , the switch 27' is in a state of being connected to the other side as shown in FIG. 18B and the passive antenna 26 is in a state of being connected to the GND portion 24 through the coil 41b.
  • the characteristics as the mobile communication terminal becomes excellent, because the electromagnetic coupling e is generated between the antenna 16 on the first casing 10 side and the passive antenna 26 on the second casing 20 side as shown in FIG. 16A or 18A . Further, when the mobile phone unit 1 is opened, the characteristics in the open state can be improved, because the passive antenna 26 is in a state of being separated ( FIGS. 15A and 15B ) or is in another connection state ( FIG. 17A and 17B ).
  • FIGS. 19A and 19B are characteristic curves showing an example of the antenna radiation efficiency of a practice example (practice example 2) according to the embodiment of the present invention.
  • FIG. 19A shows an example of the characteristic in the frequency band for the wireless communication when a mobile phone unit 1 is opened
  • FIG. 19B shows an example of the characteristic in the frequency band for the wireless communication when a mobile phone unit 1 is closed.
  • the characteristics in three states are compared: the state in which the coil with the inductance value a (here, 33nH) is connected between the passive antenna 26 and the GND portion, the state in which the coil with the inductance value b (here, 30nH) is connected between the passive antenna 26 and the GND portion, and the state in which the passive antenna 26 is separated from the GND portion.
  • the characteristics obtained in the case of using the inductance value b and in the case of not connecting to the passive antenna are superior to the characteristic obtained in the case of using the inductance value a , in almost all the frequency band for the communication.
  • the characteristics obtained in the case of using the inductance value a and in the case of using the inductance value b are superior to the characteristic obtained in the case of not connecting to the passive antenna, in almost all the frequency band for the communication.
  • the radiation efficiency shown in FIG. 19 changes depending on various factors regarding a structure such as the size of a circuit board to which an antenna is connected, and the state in which characteristic is more favorable depends on the structure. Also, regarding the inductance values, the values mentioned above are examples.
  • the switch 27 or 27' to switch the connection of the passive antenna is provided at the end portion where the GDN portion of the antenna is connected, however the switch may be provided in the middle of the passive antenna and a part of the passive antenna is separated depending on the state of the terminal.
  • the antenna characteristic in each state of the mobile phone unit can be improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Telephone Set Structure (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)

Claims (4)

  1. Terminal de communication mobile comportant :
    un premier boîtier (10) comprenant une antenne d'alimentation (16) à laquelle est délivrée une énergie (17) et
    un second boîtier (20) relié audit premier boîtier, dans lequel ledit premier boîtier et ledit second boîtier peuvent être pliés en vis-à-vis l'un de l'autre, et
    ledit second boîtier possède une antenne passive (26) et une partie de potentiel de masse (24), et
    caractérisé en ce que
    un premier état de connexion entre ladite antenne passive et la partie de potentiel de masse (24) est sélectionnée si ledit premier boîtier et ledit second boîtier sont pliés en vis-à-vis l'un de l'autre, et un second état de connexion différent entre ladite antenne passive et la partie de potentiel de masse (24) est sélectionnée si ledit premier boîtier et ledit second boîtier ne sont pas pliés en vis-à-vis l'un de l'autre.
  2. Terminal de communication mobile selon la revendication 1, dans lequel
    ladite antenne d'alimentation et ladite antenne passive sont couplées électromagnétiquement lors du pliage.
  3. Terminal de communication mobile selon la revendication 1, dans lequel
    ledit premier boîtier possède une première carte de circuit (12) reliée à ladite première antenne d'alimentation,
    ledit second boîtier possède une seconde carte de circuit (22) dans laquelle est prévue ladite antenne passive, et
    de l'énergie est délivrée entre ladite antenne d'alimentation et un potentiel de masse (14) de ladite première carte de circuit.
  4. Terminal de communication mobile selon la revendication 1, dans lequel lesdits premier et second états de connexion comporte l'un sélectionné parmi la liste comprenant :
    i. un commutateur ouvert et un commutateur fermé, respectivement ; et
    ii. un couplage d'une première inductance et un couplage d'une seconde inductance, respectivement.
EP07024685A 2003-09-18 2004-09-15 Terminal de communication mobile Expired - Fee Related EP1898490B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003326689 2003-09-18
EP04773360A EP1555716B1 (fr) 2003-09-18 2004-09-15 Terminal de communications mobile

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP04773360A Division EP1555716B1 (fr) 2003-09-18 2004-09-15 Terminal de communications mobile
EP04773360.5 Division 2004-09-15

Publications (2)

Publication Number Publication Date
EP1898490A1 EP1898490A1 (fr) 2008-03-12
EP1898490B1 true EP1898490B1 (fr) 2010-04-28

Family

ID=34372828

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07024685A Expired - Fee Related EP1898490B1 (fr) 2003-09-18 2004-09-15 Terminal de communication mobile
EP04773360A Expired - Fee Related EP1555716B1 (fr) 2003-09-18 2004-09-15 Terminal de communications mobile

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP04773360A Expired - Fee Related EP1555716B1 (fr) 2003-09-18 2004-09-15 Terminal de communications mobile

Country Status (4)

Country Link
EP (2) EP1898490B1 (fr)
JP (1) JP4426531B2 (fr)
DE (2) DE602004012377T2 (fr)
WO (1) WO2005029638A1 (fr)

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US7616158B2 (en) 2006-05-26 2009-11-10 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Multi mode antenna system
JP5222716B2 (ja) * 2008-12-25 2013-06-26 京セラ株式会社 携帯端末
JP2010157833A (ja) * 2008-12-26 2010-07-15 Panasonic Corp 携帯無線機
JP6462247B2 (ja) 2014-06-26 2019-01-30 Ｎｅｃプラットフォームズ株式会社 アンテナ装置、無線通信装置および帯域調整方法
US10193213B2 (en) * 2015-10-14 2019-01-29 Microsoft Technology Licensing, Llc Self-adaptive antenna systems for electronic devices having multiple form factors
CN111613873B (zh) 2019-02-22 2022-11-25 华为技术有限公司 天线装置及电子设备

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Also Published As

Publication number Publication date
DE602004012377T2 (de) 2009-03-12
JPWO2005029638A1 (ja) 2006-11-30
EP1898490A1 (fr) 2008-03-12
DE602004012377D1 (de) 2008-04-24
EP1555716A1 (fr) 2005-07-20
EP1555716B1 (fr) 2008-03-12
EP1555716A4 (fr) 2006-03-08
DE602004026946D1 (de) 2010-06-10
WO2005029638A1 (fr) 2005-03-31
JP4426531B2 (ja) 2010-03-03

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