EP1538696A1 - Zweibandmobiltelefon mit omnidirektionalem Strahlungsdiagramm - Google Patents

Zweibandmobiltelefon mit omnidirektionalem Strahlungsdiagramm Download PDF

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Publication number
EP1538696A1
EP1538696A1 EP04300843A EP04300843A EP1538696A1 EP 1538696 A1 EP1538696 A1 EP 1538696A1 EP 04300843 A EP04300843 A EP 04300843A EP 04300843 A EP04300843 A EP 04300843A EP 1538696 A1 EP1538696 A1 EP 1538696A1
Authority
EP
European Patent Office
Prior art keywords
ground plane
length
parts
housing
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.)
Ceased
Application number
EP04300843A
Other languages
English (en)
French (fr)
Inventor
François BLANCHO
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.)
Sagemcom Broadband SAS
Original Assignee
Sagem SA
Sagem Communications SAS
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, Sagem Communications SAS filed Critical Sagem SA
Publication of EP1538696A1 publication Critical patent/EP1538696A1/de
Ceased 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • 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
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements

Definitions

  • the invention relates to a dual-band mobile telephone in which the radiofrequency (RF) radiation pattern is omnidirectional for each of the frequency bands.
  • This mobile phone has a antenna, internal or external, as well as a ground plane divided into two parts connected by a plug circuit.
  • the invention finds applications in the field of telephones dual-band mobile phones and, in particular, in the area of electrical dimensions of a dual-band mobile phone.
  • tests are done on the phones to know, in particular, the radiated performance of the phone. These tests consist of measuring the emission / reception radiation of the antenna the phone for each frequency band on the phone. A diagram corresponding to this radiation is then plotted.
  • the measurement of this radiation is done by placing the mobile phone at a certain location compared to an antenna of measuring and moving the measurement antenna around the mobile phone, in an XYZ space, in order to perceive the radiation emitted or received while around the mobile phone.
  • the minimum distance between the phone and the measuring antenna is usually ⁇ / 2, where ⁇ is the wavelength of the signal transmitted or received by the mobile phone antenna.
  • the measurement of perceived radiation, point by point, by the measuring antenna allows draw a radiation diagram. This diagram is part of a plan YZ.
  • FIG. 1 An example of a mobile phone, placed in a measurement space XYZ, is shown in Figure 1.
  • This phone has a housing 1 including the length is approximately the length of the ground plane. It comprises also an antenna 3 which we want to measure the radiation in space X Y Z.
  • An antenna usually has a radiating element, such as a solenoid or radiating plane, and a ground plane.
  • This mass plan has a length L.
  • the ground plane can be constituted by the circuit board mobile phone. As a result, we often approximate the length of the ground plane by the length of the phone itself.
  • the length of the ground plane can be compared to the length waveform ⁇ of the signal transmitted or received by the antenna of the mobile phone.
  • the length L of the ground plane is less than or equal to ⁇ / 4, then the radiation pattern obtained for the mobile phone is omnidirectional.
  • the length L of the ground plane is equal to or greater than ⁇ / 2, then the radiation pattern of the telephone mobile no longer has this omnidirectional feature.
  • the diagram of radiation is established for each frequency band.
  • a much higher power is obtained for a band low frequency than for a high frequency band.
  • the radiated power measured with conventional tests for the GSM band is much larger than that obtained for the band DCS frequency.
  • the radiating diagram of the figure 2 has two lobes, substantially round, placed side by side coast and centered on the Y axis Z.
  • the radiation is omnidirectional, in the Y direction.
  • the wavelength is inversely proportional to the frequency
  • the wavelength ⁇ is divided by 2.
  • the length L is no longer inferior or equal to ⁇ / 4.
  • This radiation pattern has four lobes substantially symmetrical with respect to the point of origin O. Each lobe is located between the Y and Z directions. It is thus seen that the radiation is not omnidirectional. So, if we measure the power of radiation emitted in one of the directions, for example the direction Y, this power is relatively low since the radiation is distributed according to several directions.
  • the measured radiation power is therefore clearly higher in the GSM band than in the DCS band, with the technique previously described.
  • the antenna works both in the DCS band and in the GSM band, that is to say that the radiated power of the antenna is also good for the band DCS only for the GSM band. It is only the measurement technique that gives very different radiation power values for the GSM band and for the DCS band.
  • the invention proposes to adapt the electrical dimensions of the telephones the operating frequencies used for the transmission of signals.
  • the invention proposes to divide the ground plane of the mobile phone in a first and a second parts and, depending of the frequency band considered, take into account the length of a single part of the ground plane or the total length of the two parts of the mass plan. For this, the two parts of the ground plane are connected electrically by a plug circuit.
  • Figure 1 already described, represents an example of a mobile phone in an XYZ measurement space.
  • Figure 2 already described, represents an example of a diagram of radiation conventionally obtained for the GSM frequency band.
  • FIG. 3, already described, represents an example of a diagram of radiation conventionally obtained for the DCS frequency band.
  • FIG. 4 represents a mobile phone of the clam type, in accordance with FIG. the invention.
  • FIGS. 5A and 5B show examples of diagrams of radiation obtained, respectively, for the GSM frequency bands and DCS, with the mobile phone of Figure 4.
  • the electrical dimensions of a mobile phone condition the phone radiation pattern, by the existence of a high-frequency current flow, due to the mass, electrical connections, etc.
  • the invention proposes to adapt these electrical dimensions at the operating frequencies used by the mobile telephone for transmitting and / or receiving signals. In particular, it proposes to adapt electrical dimensions to GSM and DCS frequencies.
  • This adaptation of the electrical dimensions is achieved by dividing the mobile phone's ground plane in a first part and a second part, which may be considered independently of one another or additionally one and the other. For that, the first and second parts of the ground plane are connected electrically via a circuit plug.
  • the mobile phone of the invention may be a monoblock telephone, that is to say formed of a single housing, in which the ground plane, by example made by the circuit board of the phone, is deliberately divided in two parts. The two parts of the mass plan are then located one to following each other, in the case of the phone, and connected by a circuit plug also located in the housing of the phone.
  • the telephone mobile is a clam-type telephone, that is to say with two parts articulated with each other.
  • the phone is in communication mode, that is, can make or receive calls.
  • both parties are substantially one above the other, so the phone is in non-communication, that is, it is off and can not receive or transmit calls.
  • FIG. 4 shows an example of a mobile phone type clam, according to the invention.
  • This mobile phone has a first part of housing 1 and a second housing part 2.
  • the first housing part 1 comprises an antenna transmission / reception 3.
  • This antenna 3 can be an internal antenna, for example of patch type (that is to say a plane antenna located above a ground plane) or an external antenna, for example of the solenoid type.
  • the ground plane is usually formed by the circuit board of the mobile phone.
  • the ground plane is divided into two ground plane parts.
  • the first housing part 1 comprises a first part of the plan 4.
  • This first ground plane part is formed by example, by the printed circuit located in the first housing part and with many components such as a screen display, a speaker, etc.
  • the components of this printed circuit are classics in a clam-type mobile phone and are, by therefore, not described here.
  • the second housing part 2 has a second plan part 5.
  • This second ground plane part is formed by example, by the printed circuit located in the second housing part 2 and with many components such as the keyboard.
  • the first ground plane portion 4 has a length L1.
  • This length L1 is approximately the length of the first part of housing.
  • the second ground plane portion 5 has a length L2, which is approximately the length of the second housing part.
  • the first and second parts of the plane 4 and 5 are electrically connected by two plug circuits 6 and 6 '.
  • these plug circuits are placed at the edges of the parts of the ground plane, that is, as close as possible to the lateral extremities of these parts. Indeed, in practice, we see that the current flows, between the two parts, essentially by the side edges of the printed.
  • the invention therefore proposes to place at least one plug circuit between the two parts of the ground plane.
  • Preferably two plug circuits are placed between the two ground plane parts, near the edges both sides. These two plug circuits are centered on the resonance value of one of the frequencies of the bands transmission / reception of the mobile phone, called the tuning frequency.
  • a plug circuit is a circuit composed of a capacitance and inductance in parallel and arranged to present a relatively high impedance for the tuning frequency and a relatively low impedance for all other frequencies.
  • each circuit is realized plug using a subminiature inductor of type 0201 (from dimensions 0.6 x 0.3 mm) manufactured by Murata Manufacturing Co., Ltd.
  • These plug circuits keep the nominal dimension the mobile phone's ground plane for one of the frequency bands, in particular the GSM band, and to limit the size of the ground plane of the mobile phone to the first part of the case for the other band of frequency, in particular the DCS band.
  • the second part of the ground plane 5, length L2 is then cut off and not taken into account for the measurement of radiation at 1800 MHz frequency.
  • only the first part of the ground plane 4, of length L1 is taken into account for measurement of radiation in the DCS band. This is explained by the fact that at the low frequency, ie 900 MHz, the HF current flows throughout the length L1 + L2 of the ground plane and that at the high frequency, ie 1800 MHz, the current does not flow in the second part of the ground plane.
  • the length considered for comparison with the wavelength ⁇ is the length total of the ground plane, ie L.
  • the measurement of radiation thus provides an omnidirectional diagram, as shown in Figure 5A.
  • the length considered for comparison with the wavelength ⁇ is the length of the first part of the ground plane, L1.
  • Measurement radiation then provides an omnidirectional diagram, as shown in FIG. 5B A radiation diagram is thus obtained omnidirectional for the high frequency, the DCS band, while keeping an omnidirectional diagram for the low frequency, ie the GSM band.
  • a mobile phone whose initial mass plan is of length L is divided into a first part of ground plane 4 of length L1 and a second ground plane portion 5 of length L2.
  • L1 + L2 L.
  • This division, or separation, of the ground plane can be implemented in any mobile phone.
  • mobile clam-type devices have the advantage of presenting a mass separated mechanically, by the very fact of the existence of two parts housing.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Set Structure (AREA)
EP04300843A 2003-12-04 2004-12-02 Zweibandmobiltelefon mit omnidirektionalem Strahlungsdiagramm Ceased EP1538696A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0350970A FR2863407B1 (fr) 2003-12-04 2003-12-04 Telephone mobile bi-bande a diagramme de rayonnement omnidirectionnel
FR0350970 2003-12-04

Publications (1)

Publication Number Publication Date
EP1538696A1 true EP1538696A1 (de) 2005-06-08

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Family Applications (1)

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EP04300843A Ceased EP1538696A1 (de) 2003-12-04 2004-12-02 Zweibandmobiltelefon mit omnidirektionalem Strahlungsdiagramm

Country Status (2)

Country Link
EP (1) EP1538696A1 (de)
FR (1) FR2863407B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2144376A1 (de) * 2006-02-15 2010-01-13 Palm, Inc. Mobiles Endgerät
EP2479843A4 (de) * 2009-09-17 2014-01-22 Nec Corp Antenne, drahtlose kommunikationsvorrichtung und antennenkonfigurationsverfahren
EP3002821A1 (de) * 2014-10-02 2016-04-06 Sony Corporation Drahtloses Kommunikationsendgerät

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5999831A (en) * 1996-04-01 1999-12-07 Nec Corporation Portable radio
EP1119074A2 (de) * 1997-08-07 2001-07-25 Tokin Corporation Mehrbandantenne zur Verwendung in einem mobilen Funkgerät
US6342859B1 (en) * 1998-04-20 2002-01-29 Allgon Ab Ground extension arrangement for coupling to ground means in an antenna system, and an antenna system and a mobile radio device having such ground arrangement
US20030146873A1 (en) * 2000-08-01 2003-08-07 Francois Blancho Planar radiating surface antenna and portable telephone comprising same
US20030216150A1 (en) * 2002-05-14 2003-11-20 Nec Corporation Cellular phone and method of operating the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5999831A (en) * 1996-04-01 1999-12-07 Nec Corporation Portable radio
EP1119074A2 (de) * 1997-08-07 2001-07-25 Tokin Corporation Mehrbandantenne zur Verwendung in einem mobilen Funkgerät
US6342859B1 (en) * 1998-04-20 2002-01-29 Allgon Ab Ground extension arrangement for coupling to ground means in an antenna system, and an antenna system and a mobile radio device having such ground arrangement
US20030146873A1 (en) * 2000-08-01 2003-08-07 Francois Blancho Planar radiating surface antenna and portable telephone comprising same
US20030216150A1 (en) * 2002-05-14 2003-11-20 Nec Corporation Cellular phone and method of operating the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ROTHAMMEL, KARL: "Antennenbuch", 1981, TELEKOSMOS-VERLAG FRANCKH, STUTTGART, XP002321507 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2144376A1 (de) * 2006-02-15 2010-01-13 Palm, Inc. Mobiles Endgerät
EP2479843A4 (de) * 2009-09-17 2014-01-22 Nec Corp Antenne, drahtlose kommunikationsvorrichtung und antennenkonfigurationsverfahren
EP3002821A1 (de) * 2014-10-02 2016-04-06 Sony Corporation Drahtloses Kommunikationsendgerät
US9379758B2 (en) 2014-10-02 2016-06-28 Sony Corporation Wireless communication terminal

Also Published As

Publication number Publication date
FR2863407B1 (fr) 2006-03-24
FR2863407A1 (fr) 2005-06-10

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