EP1667281A1 - Mobiles Kommunikationsendgerät - Google Patents

Mobiles Kommunikationsendgerät Download PDF

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Publication number
EP1667281A1
EP1667281A1 EP05292514A EP05292514A EP1667281A1 EP 1667281 A1 EP1667281 A1 EP 1667281A1 EP 05292514 A EP05292514 A EP 05292514A EP 05292514 A EP05292514 A EP 05292514A EP 1667281 A1 EP1667281 A1 EP 1667281A1
Authority
EP
European Patent Office
Prior art keywords
resonant
communication terminal
resonant element
frequency
terminal according
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.)
Ceased
Application number
EP05292514A
Other languages
English (en)
French (fr)
Inventor
David p/a Luparello P. Delas
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.)
Vallaroche SAS
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Publication of EP1667281A1 publication Critical patent/EP1667281A1/de
Ceased 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

Definitions

  • the present invention relates to a mobile communication terminal comprising at least one element having a resonant frequency in one of the transmission and / or reception frequency bands of the terminal, and an offset element for shifting said frequency outside. one of said frequency bands used by the terminal.
  • a mobile communication terminal such as a telephone or any other electronic device equipped with at least one radiocommunication system
  • a mobile communication terminal is composed of various elements, such as, for example, a printed circuit board, also called PCB (Printed Circuit Board ), on which are mounted the electronic components necessary for the operation of said system, an antenna, a screen, a keyboard, a speaker, a microphone, a battery, etc., all enclosed in a housing.
  • PCB printed Circuit Board
  • these elements are capable of emitting in a resonance frequency which, in most cases, does not disturb the behavior of the terminal in so far as this resonant frequency does not not found in one of the frequency bands used by the radiocommunication system of this terminal to transmit and / or receive radio waves.
  • the shape and dimensions of some of these elements are of the same order of magnitude as the radio wave lengths transmitted or received by the radiocommunication system. Consequently, the resonant frequency of this element lies in a frequency band used by the terminal's radio communication system, which induces a disturbance that results in a decrease in the efficiency of the antenna used by this radiocommunication system, by a increase in noise level (desensitization) and harmonic level degradation.
  • a mobile communication terminal provides more and more services while maintaining small dimensions. For example, it is more and more common to encounter a terminal using several radio communication systems such as, for example, the GSM 900 system (Global System for Communication) which uses a frequency band centered around 900 MHz and the DCS system (Digital Communication System) which uses a frequency band centered around 1800MHz.
  • GSM 900 system Global System for Communication
  • DCS system Digital Communication System
  • Fig. 1 represents a mobile communication terminal 100 (for example a telephone) according to the invention.
  • This terminal 100 comprises the conventional elements inherent to this type of apparatus, namely a human / machine interface composed for example of a keyboard 101, a screen 102 and a speaker 103, a card of printed circuit) 104 on which are mounted the various electronic components necessary for the operation of the terminal and comprising a mass, and at least one antenna 105 transmitting and / or receiving in at least one frequency band F, and a battery 106 which is connected to the printed circuit board 104 for its power supply by two conductors 106 1 and 106 2 , one of which, 106 2 , is connected to the ground of the printed circuit board 104 and the other, said point of supply potential 106 1 , is connected to a point of the printed circuit board 104 which is powered by a supply potential.
  • a human / machine interface composed for example of a keyboard 101, a screen 102 and a speaker 103, a card of printed circuit) 104 on which
  • the battery 106 because it is electrically connected by a ground point of the printed circuit board 104, behaves like a half-wave antenna. It has been shown that the value of this wavelength is given by the following relation: ⁇ two ⁇ l + The + H , where 1 and L are respectively the length and the width of the element 106 and H the distance between the lower face of the battery 106 and the printed circuit board 104, when this latter is rectangular or parallelepipedic.
  • FIG. A diagram of the Stationary Wave Rate (TOS) of a terminal as just described as a function of frequency in the case where the present invention is not implemented (thin line curve) ).
  • This diagram has three main resonant frequencies 11, 12 and 13.
  • the value of the TOS is strongly disturbed by the presence of the resonance frequency 13 emanating from the battery 106.
  • a mobile communication terminal to which the present invention applies is of the type which comprises a printed circuit board which is provided with a mass and on which are mounted in particular a radiocommunication system provided for transmitting and receiving in at least one frequency band, and at least one electrically conductive element including at least one point is electrically connected to a first point of said mass of said printed circuit board, said resonant element having a shape and dimensions such that it has a resonant frequency in one or more of the frequency bands of transmission and / or reception of said radio communication system of said terminal.
  • said communication terminal further comprises at least one shift element connected to the ground of said printed circuit board by electromagnetic coupling and for shifting said resonance frequency of said resonant element out of said transmit and / or receive frequency bands of said radio communication system.
  • said shifting element consists of a metal plate located at a distance from said resonant element.
  • said offset element is advantageously placed along one of the two edges or one of the two faces extending in the width direction of the resonant element.
  • said electrical connection between the mass of said printed circuit board and said resonant element is located at one of its corners.
  • the surface of said plate and the distance between said plate and said resonant element are adjusted so that the value of said resonant frequency is shifted by said shift element to a resonance frequency not used by said radio communication system of said terminal.
  • the present invention applies to a terminal such as that which has already been described in relation to FIG. 1. It therefore comprises a keyboard 101, a screen 102 and a speaker 103, a printed circuit board 104 on which are mounted the various electronic components necessary for the operation of the terminal and comprising a mass and, and at least one antenna 105 emitting and / or receiving in at least one frequency band F, and a battery 106 which is connected to the printed circuit board 104 for its power supply by two conductors 106 1 and 106 2 , one of which 106 2 , is connected to the ground of the printed circuit board 104 and the other, said point of supply potential 106 1 , is connected to a point on the printed circuit board 104 which is powered by a supply potential, for example at a potential of + 4 volts. It may be noted that the dimensions of the elements drawn on FIGS. are not to scale, some of them having been enlarged to allow a better representation of the elements in relation to the invention.
  • the present invention proposes to equip said terminal with an offset element 107 which is provided so that the resonance frequency the resonant element 106 is shifted in a band of frequencies not used by the antenna 105.
  • Fig. 2 shows a first embodiment of an offset element 107 applicable in the case where the body of the element 106 is electrically conductive and is, by the conductor 106 2 at the same DC potential as the ground of the circuit board
  • the offset member 107 is made of a conductor which provides a direct connection between the body of the battery 106, at a point remote from the electrical conductors 106 1 and 106 2 , and the ground of the printed circuit board 104 .
  • the resonance frequency of the battery 106 has been shifted because it now behaves like a quarter wave antenna ⁇ GSM 4 ⁇ l + The + H .
  • the battery 106 may be embedded in a shell of insulating material. In this embodiment, it is necessary to practice a window in this shell so as to ensure the electrical connection of the element 107 with the body of the battery 106.
  • the shifting element 107 of this first embodiment as shown in FIG. 2 can not be realized when the electrically conductive body of the battery 106 is not at the same DC potential as the mass of the printed circuit board 104, because of the short-circuit at the DC voltage level of the power supply. he would then beget.
  • the shifting element 107 of this first embodiment does not make it possible to define the offset value of the resonance frequency of the element 106.
  • the resonance frequency disturbs the 1800 MHz band, that is to say the DSC band.
  • this frequency has a value of 900 MHz, thus disturbing a terminal using GSM 900MHz mode.
  • Fig. 3 represents the shifting element 107 according to a second embodiment of the invention.
  • This element 107 consists of a metal plate connected to the ground of the printed circuit board 104 by a so-called return conductor 201 and connected only by electromagnetic coupling to the body of the battery 106.
  • the battery 106 It must be electrically isolated from the shifting element 107 and, in practice, it is, because it is embedded in a shell of insulating material.
  • this shifting element 107 has a capacitive behavior which will shift the resonance frequency of the element 106 by a value which depends essentially on the physical characteristics of this shifting element 107, such as its area and its distance. d "to the body of the battery 106.
  • the battery 106 behaves like a rectangular patch antenna.
  • the currents that flow on his body are concentrated mainly along its four edges. But, only two of these edges are radiant. These are the ones who are separated by the greatest distance, that is, the edges that extend in the direction of the width of the element 106. Indeed, the other two edges can be likened to two slots traversed by magnetic currents of opposite direction whose contributions cancel each other .
  • the offset plate 107 is therefore advantageously placed along one of these two edges extending in the width direction of the battery 106.
  • the capacitive value C of the shifting element 107 depends on the surface of the metal plate 107 and its distance d to the battery 106.
  • the resonant frequency of the battery 106 alone without a metal plate 107 is 1.7 GHz.
  • the capacitance introduced is 3.8 ⁇ F, so that the frequency of the resonance is now theoretically offset by 0.4 GHZ to reach the frequency of 1.3 GHz, not used by the terminal.
  • Fig. 5 shows, in bold lines, the diagram of the Stationary Wave Rate (TOS) as a function of the frequency in the case of the addition of an offset element 107 according to the second embodiment which has just been described. It can be seen in this second diagram that the frequency band around 1800 MHz and the frequency band around 900 MHz are not disturbed by the resonance frequency emanating from the battery 106. This frequency has been shifted around the frequency band. 1300 MHz.
  • TOS Stationary Wave Rate
  • the advantage of using an offset element 107 such as that just described in connection with FIG. 3 is that its dimension can be easily adjusted empirically in situ after the design and realization of a prototype of a terminal, moving to a non-disturbing value the resonance frequency of the battery 106.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
  • Telephone Set Structure (AREA)
EP05292514A 2004-12-01 2005-11-25 Mobiles Kommunikationsendgerät Ceased EP1667281A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0412757A FR2878680B1 (fr) 2004-12-01 2004-12-01 Terminal de communication mobile

Publications (1)

Publication Number Publication Date
EP1667281A1 true EP1667281A1 (de) 2006-06-07

Family

ID=34952000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05292514A Ceased EP1667281A1 (de) 2004-12-01 2005-11-25 Mobiles Kommunikationsendgerät

Country Status (2)

Country Link
EP (1) EP1667281A1 (de)
FR (1) FR2878680B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2095461A1 (de) * 2006-11-17 2009-09-02 Nokia Corporation Positionierung leitfähiger komponenten neben einer antenne
JP5357970B2 (ja) * 2009-09-18 2013-12-04 シャープ株式会社 電池および無線通信機器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB356359A (en) * 1930-07-02 1931-09-10 Terence Cameron Macnamara Improvements in or relating to wireless aerial systems
JPH1155148A (ja) * 1997-06-04 1999-02-26 Toshiba Corp 携帯無線装置
US20040046701A1 (en) * 2001-03-07 2004-03-11 Stefan Huber Radio communications device comprising an sar value-reducing correction element
EP1469550A2 (de) * 2003-04-18 2004-10-20 Matsushita Electric Industrial Co., Ltd. Funkantennenanordnung mit Steuerung zur Überwachung der SAR (spezifische Absorptionsrate) und diese benutzende Funkkommunikationseinrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB356359A (en) * 1930-07-02 1931-09-10 Terence Cameron Macnamara Improvements in or relating to wireless aerial systems
JPH1155148A (ja) * 1997-06-04 1999-02-26 Toshiba Corp 携帯無線装置
US20040046701A1 (en) * 2001-03-07 2004-03-11 Stefan Huber Radio communications device comprising an sar value-reducing correction element
EP1469550A2 (de) * 2003-04-18 2004-10-20 Matsushita Electric Industrial Co., Ltd. Funkantennenanordnung mit Steuerung zur Überwachung der SAR (spezifische Absorptionsrate) und diese benutzende Funkkommunikationseinrichtung

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
C. R. ROWELL: "A Capacitively loaded PIFA for compact mobile telephone", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 45, no. 5, May 1997 (1997-05-01), XP000688460, DOI: doi:10.1109/8.575634
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 05 31 May 1999 (1999-05-31) *
ROWELL C R ET AL: "A CAPACITIVELY LOADED PIFA FOR COMPACT MOBILE TELEPHONE HANDSETS", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 45, no. 5, May 1997 (1997-05-01), pages 837 - 842, XP000688460, ISSN: 0018-926X *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2095461A1 (de) * 2006-11-17 2009-09-02 Nokia Corporation Positionierung leitfähiger komponenten neben einer antenne
EP2095461A4 (de) * 2006-11-17 2011-05-04 Nokia Corp Positionierung leitfähiger komponenten neben einer antenne
CN101536246B (zh) * 2006-11-17 2016-03-09 诺基亚技术有限公司 在天线附近定位传导组件
JP5357970B2 (ja) * 2009-09-18 2013-12-04 シャープ株式会社 電池および無線通信機器

Also Published As

Publication number Publication date
FR2878680A1 (fr) 2006-06-02
FR2878680B1 (fr) 2007-03-02

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