EP1911120B1 - Systeme d'antennes a diversite de type dipole - Google Patents

Systeme d'antennes a diversite de type dipole Download PDF

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Publication number
EP1911120B1
EP1911120B1 EP06764216A EP06764216A EP1911120B1 EP 1911120 B1 EP1911120 B1 EP 1911120B1 EP 06764216 A EP06764216 A EP 06764216A EP 06764216 A EP06764216 A EP 06764216A EP 1911120 B1 EP1911120 B1 EP 1911120B1
Authority
EP
European Patent Office
Prior art keywords
arm
arms
antenna
antenna system
electronic card
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.)
Active
Application number
EP06764216A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1911120A1 (fr
Inventor
Philippe Minard
Jean-François PINTOS
Ali Louzir
Philippe Gilberton
Jean-Luc Robert
Corinne Nicolas
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.)
THOMSON LICENSING
Original Assignee
Thomson Licensing SAS
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Publication date
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Publication of EP1911120A1 publication Critical patent/EP1911120A1/fr
Application granted granted Critical
Publication of EP1911120B1 publication Critical patent/EP1911120B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/084—Pivotable antennas
    • 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
    • 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
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/20—Two collinear substantially straight active elements; Substantially straight single active elements

Definitions

  • the present invention relates to a diversity antenna system comprising at least two dipole type antennas.
  • the present invention relates more particularly to an antenna system of the above type for the reception of television signals, in particular the reception of digital signals on a portable electronic device such as a laptop commonly called PC, a PVA (for Assistant Personnel) or for other similar devices requiring an antenna system to receive electromagnetic signals.
  • the present invention also relates to a support for the antenna system for attachment to the portable device.
  • the devices currently on the market are most often constituted by an independent antenna such as a whip or loop antenna mounted on a housing comprising a USB connector.
  • the antenna described in the French patent application No. 05 51009 comprises a first and a second conductive arm supplied in differential, one of said arm said first arm forming at least one cover for an electronic card.
  • the first arm is in the form of a housing in which is inserted the electronic card which comprises the processing circuits of the signals received by the dipole type antenna.
  • the present invention relates to a diversity antenna system comprising at least two dipole type antennas each formed of a first and a second conducting arm, supplied with a differential.
  • the two antennas comprise a common arm said first arm forming at least one cover for an electronic card and each a second arm rotatably mounted at one end of the first arm.
  • the second arms are rotatably mounted at one end of the first arm about a common axis and, preferably, the second arms have profiles identical to and complementary to the profile of the first arm so as to be able to fold over one side of the first arm.
  • each second arm is rotatably mounted at one end of the first arm about a proper axis.
  • the second arms have identical profiles corresponding to the side walls of the housing formed by the first arm.
  • the second arms may also have complementary profiles for folding on one of the upper and / or lower faces of the first arm.
  • the first arm has the shape of a housing, in which is inserted an electronic card, more particularly the electronic card used to process the signals received by the antenna and send them to a portable display apparatus such as a laptop or the like.
  • the electronic card comprises at one end at least two connection ports for the supply of each antenna of the system and at the other end a connection port formed, for example, by a USB connector allowing the connection to a portable electronic device such as a laptop or the like.
  • the present invention relates to a support for the antenna system comprising a fixing means on the adjustable portable device and means for receiving the first arm of the system rotatably mounted on the fastening means.
  • this dipole antenna comprises a first conducting arm 1 and a second conducting arm 2, the two arms being connected to each other via a hinge zone 3 located at one of the ends of each of the arms.
  • the arm 1 has substantially the shape of a housing with a portion 1a of substantially rectangular shape extending by a curved portion 1b flaring gradually to allow the energy to be radiated gradually favoring thus adapting to a wider frequency band.
  • the length of the arm 1 is substantially equal to ⁇ / 4 where ⁇ represents the wavelength at the central operating frequency.
  • the length of the arm 1 is close to 112 mm for operation in the UHF band (band between 470 and 862 MHz).
  • the antenna comprises a second arm 2 mounted to rotate about the axis 3 which also represents the connection point of the antenna to the signal processing circuit.
  • the electrical connection of the antenna is made by a metal wire, for example a coaxial cable or the like while the axis of rotation is made of a material relatively transparent to electromagnetic waves.
  • the arm 2 whose length is substantially equal to ⁇ / 4, has a curved profile followed by a rectangular flat portion, for folding the arm 2 completely against the arm 1 in the closed position.
  • the arm 2 being rotatably mounted relative to the arm 1, this makes it possible to modify the orientation of the arm 2 so as to optimize the reception of the television signal.
  • the radiation patterns are inclined according to the angle of inclination of the arm. This inclination thus makes it possible to optimize the reception of the digital television signal.
  • an antenna system comprises two antennas consisting of a first common arm 10 forming at least the cover 10a of an electronic card for processing the signal received by the antenna.
  • the common arm 10 has an upper portion or cover member 10a and a lower portion 10b, the assembly forming a housing for receiving an electronic card processing the received signals.
  • Simulations were performed on a system as shown in figure 3 and having the following characteristics: 1) the material used is copper of conductivity 4.9 * 10 e 7S / m, 2) the length of arm 11 is approximately equal to 112mm, 3) the radius of curvature used for parts 10a, 10b , 11, 12 is 31 mm, 4) the width of the arms 10, 11 and 12 is about 25mm so as to insert the electronic card width 20mm.
  • the results obtained during the simulation carried out in a known manner using the IE3D software are given on the Figures 4 to 8 .
  • the curves show that the adaptation is performed on a relatively narrow band that can be improved by using an adaptation cell.
  • This cell is conventionally constituted by an LC circuit.
  • Adaptation and isolation curves with adaptation cell are represented on the figure 5 . In this case, the adaptation is performed on a larger frequency band.
  • the insulation between the first antenna formed of the first arm 10 and the second arm 11 and the second antenna formed of the first arm 10 and the second arm 12 remains sufficient to provide a significant gain in diversity, especially taking into account the vertical polarizations for the first antenna and horizontal for the second antenna as well as strong decorrelations of radiation pattern as shown on the figure 6 .
  • the radiation patterns of the figure 6 show a maximum decoupling and an optimal decorrelation between the two accesses when the two second branches 11, 12 are positioned perpendicularly with respect to each other.
  • the two arms 11 and 12 are held at positions perpendicular to each other whatever the angle ⁇ of the first antenna, for example to say antenna constituted by the first common arm 10 and the second arm 11.
  • the efficiency of the antenna system is greater than 50% over almost the entire UHF band, which meets the desired performance.
  • An average gain around 0 dBi over the entire UHF band corresponds to a 3dBi directivity for this type of antenna with a yield of 50%.
  • the antenna system comprises two dipole type antennas formed of a first arm 20 common to the two antennas.
  • Each antenna has a second arm 21, 22 rotatably mounted at one end of the first arm.
  • Each second arm 21, 22 pivots independently around two axes of rotation 23, 24 separate.
  • the two arms 21, 22 can form the side walls of the first common arm 20, as will be explained in more detail below.
  • the first common arm 20 comprises a rectangular portion 20a forming a housing for an electronic card for, for example, the processing of electromagnetic signals received or transmitted by the antenna system.
  • the rectangular portion 20a is extended by a curved portion 20b flaring out gradually.
  • the two second arms 21, 22 have a profile adapted to the side portions of the first conductive arm 20. More specifically, they have a substantially rectangular portion extending through a curved portion.
  • the arms 21 and 22 can be oriented relative to the first arm 20 at angles ⁇ 1 and ⁇ 2 which therefore represent the opening angle between respectively the second arm 22 and the arm 20 and the second arm 21 and the arm 20 Since the two axes of rotation 23 and 24 are distant from each other, a spatial diversity is observed, in addition to a diversity of radiation, related to the spatial separation of the two antennas formed by the dipoles 21, 20 and 22, 20.
  • the two second arms 21 and 22 being rotatably mounted around two separate axes 23, 24 provided at the end of the first arm 20, it is possible to rotate them so that in the unused position, the two arms 21, 22 fold on the lateral faces of the first common arm 20 giving a compact system easily transportable when not in use.
  • the antenna has a natural adaptation around the central operating frequency but not on the entire UHF band for both values of ⁇ .
  • the isolation difference for the two values of ⁇ is proportional to the correlation of the antenna system diagrams. This makes it possible, depending on the frequency channel used, to adjust the insulation and thus to improve the desired effect by using diversity.
  • the adaptation circuit here makes it possible to widen the adaptation bandwidth considered for a level of S11 to -6 dB, which is a value that is typical for the intended application.
  • the remark concerning the insulation of the figure 13 also applies here.
  • the figure 15 represents the system yield curves while the figure 16 represents the gain curves for the two antennas of the antenna system described above.
  • the performance of the antenna system is greater than 60% over almost the entire UHF band, which reflects a good performance for the intended application.
  • An average gain around 0.5dBi over the entire UHF band corresponds to a directivity of 3dBi for this type of antennas with a yield of 60%.
  • the first arm or common arm 30 has a shape substantially elliptical with a main axis x, x. Near one end of the main axis x, x are mounted around two distinct axes 33, 34 the two second arms 31, 32 of the two dipole type antennas. These two arms have the shape of a half ellipse.
  • the two arms 31, 32 are rotatably mounted so as to be able to fold respectively on the upper face and the lower face of the common arm 30.
  • a system with two antennas of this type has been simulated and the figure 18 gives the adaptation and isolation curves of such an antenna.
  • the characteristics used for the simulation are as follows: 1) the material used is copper of conductivity 4.9 * 10 e 7S / m, 2) the two axes of the ellipse for the elements 30, 31 and 32 have dimensions, respectively 25mm and 50mm, 3) the thickness of the housing is 12mm, which allows to insert the electronic card thickness of 10mm.
  • the diversity antenna system comprises a first common arm 40 having an oblong housing shape. At the end of the housing 40 are provided two separate axes 43, 44 on which are respectively mounted a first second arm 41 and a second second arm 42 to obtain the two dipole antennas forming the antenna system-compliant with the invention. These arms 41 and 42 of oblong shape can rotate about the axes 43 and 44 and fall back on the lateral sides of the first common arm 40 forming a housing.
  • the system comprises a first common arm 50.
  • This arm has a shape identical to the first arm 30 of the embodiment of the figure 9 .
  • At the flared end of the arm 50 are provided two distinct axes of rotation 53, 54 on which are respectively mounted a first second arm 51 and a second second arm 52.
  • the first second arm 51 has a part that can be folded down on the side face of the first arm 50.
  • This portion 51 is extended perpendicularly by a rectangular member 51 'to fall back under the arm 50 while the second second arm 52 has a main portion 52 can be folded on the another side face of the element 50, this portion 52 extending by a rectangular portion 52 'perpendicular which is folded down on the upper part of the element 50.
  • This electronic card schematically comprises a first amplifier LNA (Low Noise Amplifier or "Low Noise Amplifier”) 100 connected in 1A to one of the antennas of the antenna system according to the present invention.
  • the LNA amplifier 100 is connected to a tuner 101 itself connected to a demodulator 102.
  • the card comprises a second LNA amplifier 110 connected at 1B to the second antenna.
  • the LNA 110 is connected to a tuner 111 connected to a demodulator 112.
  • the two demodulators 102 and 112 are interconnected so as to have a master demodulator, namely 112 in the embodiment shown and a slave demodulator, namely 102 in the embodiment shown.
  • the output of the master demodulator 112 is connected to a USB interface 120, itself connected to a USB connector 130 for connecting the antenna system to the USB port of a portable terminal such as a laptop or PC or any other device. another device of the same type.
  • the carrier includes a box-like member 210 for receiving the common arm 10 of the antenna system of the present invention.
  • the element 110 comprises an upper opening 211 adapted to receive said arm and a lower opening allowing the connecting to a connector on the portable device such as a USB connector.
  • the element 210 is rotatably mounted about the axis 212 on a fixing means 200 for fixing the antenna support to a device, more particularly on the screen 300 of a laptop.
  • the attachment means 200 comprises an L-shaped member 201 on which the box-shaped member 210 is mounted.
  • the perpendicular portion of the L-shaped member has an opening 202 forming a slider.
  • a second element 203 L In this slide is inserted a second element 203 L, the two elements L 202 and 203 forming clamp on the screen 300.
  • the element 203 is provided on its part fitting into the slide of a oblong hole not shown. Once in position, the spacing between the element 203 and the element 201 is maintained by a clamping means 204 such as a clamping screw or the like.
  • the free portion of the second L-shaped member is curved inward, reinforcing the pincer effect.
  • a first adjustment makes it possible to tighten the support on the edge of the screen so as to fit on any type of screen.
  • a second adjustment can be made by rotating the element 210 receiving the antenna system around the axis 212 to orient the antennas so as to optimize the quality reception for a given channel.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
EP06764216A 2005-08-01 2006-07-19 Systeme d'antennes a diversite de type dipole Active EP1911120B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0552401A FR2889362B1 (fr) 2005-08-01 2005-08-01 Systeme d'antennes a diversite de type dipole
PCT/EP2006/064415 WO2007014855A1 (fr) 2005-08-01 2006-07-19 Systeme d'antennes a diversite de type dipole

Publications (2)

Publication Number Publication Date
EP1911120A1 EP1911120A1 (fr) 2008-04-16
EP1911120B1 true EP1911120B1 (fr) 2012-03-28

Family

ID=36405942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06764216A Active EP1911120B1 (fr) 2005-08-01 2006-07-19 Systeme d'antennes a diversite de type dipole

Country Status (7)

Country Link
US (1) US8310405B2 (ja)
EP (1) EP1911120B1 (ja)
JP (1) JP4864086B2 (ja)
KR (1) KR101274170B1 (ja)
CN (1) CN101263631B (ja)
FR (1) FR2889362B1 (ja)
WO (1) WO2007014855A1 (ja)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2901063A1 (fr) * 2006-05-12 2007-11-16 Thomson Licensing Sas Antenne compacte portable pour la television numerique terrestre
JP4933980B2 (ja) * 2007-08-13 2012-05-16 トッパン・フォームズ株式会社 アンテナ部材
FR2923120B1 (fr) * 2007-10-31 2010-05-07 Archos Sa Dispositif pour permettre a un appareil portable de recevoir et/ou d'emettre des signaux radiofrequences et systeme associe.
WO2010117957A2 (en) 2009-04-06 2010-10-14 Mayo Foundation For Medical Education And Research Methods and materials for delivering molecules
CN102541164A (zh) * 2010-12-14 2012-07-04 技嘉科技股份有限公司 电脑系统
CN104106081B (zh) * 2012-01-26 2017-10-31 韩美爱提株式会社 货架扫描仪、扫描装置及扫描方法
US9105971B2 (en) * 2012-12-13 2015-08-11 Visteon Global Technologies, Inc. Single external antenna for FM phase diversity for a vehicle radio unit
CN107591609A (zh) * 2016-07-07 2018-01-16 南方科技大学 多频带天线、多频带天线装置及钟表

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0697713A (ja) * 1992-07-28 1994-04-08 Mitsubishi Electric Corp アンテナ
US5905467A (en) * 1997-07-25 1999-05-18 Lucent Technologies Inc. Antenna diversity in wireless communication terminals
JPH1168438A (ja) * 1997-08-20 1999-03-09 Yokowo Co Ltd テレビ用ダイポールアンテナおよびテレビジョン受像機
US6859182B2 (en) * 1999-03-18 2005-02-22 Dx Antenna Company, Limited Antenna system
JP2001111327A (ja) * 1999-10-14 2001-04-20 Harada Ind Co Ltd 円偏波クロスダイポールアンテナ
WO2003073552A1 (en) * 2002-02-26 2003-09-04 Nortel Networks Limited User terminal antenna arrangement for multiple-input multiple-output communications
JP2004228984A (ja) * 2003-01-23 2004-08-12 Alps Electric Co Ltd アンテナ装置
JP2004304753A (ja) * 2003-03-18 2004-10-28 Seiko Epson Corp アンテナ装置
JP2005244260A (ja) * 2003-12-24 2005-09-08 Toshiba Corp 携帯無線端末
JP2006121382A (ja) * 2004-10-21 2006-05-11 Sharp Corp ダイバーシティ受信装置及びこれを有する映像表示装置及び携帯電話機
FR2884973A1 (fr) * 2005-04-20 2006-10-27 Thomson Licensing Sa Antenne large bande de type dipole
US20070060089A1 (en) * 2005-09-12 2007-03-15 James Owen Wi-Fi network locator with directional antenna and wireless adaptor
FR2896341A1 (fr) * 2006-01-17 2007-07-20 Thomson Licensing Sas Antenne compacte portable
FR2901063A1 (fr) * 2006-05-12 2007-11-16 Thomson Licensing Sas Antenne compacte portable pour la television numerique terrestre

Also Published As

Publication number Publication date
US20100207837A1 (en) 2010-08-19
KR20080033308A (ko) 2008-04-16
US8310405B2 (en) 2012-11-13
EP1911120A1 (fr) 2008-04-16
JP4864086B2 (ja) 2012-01-25
FR2889362A1 (fr) 2007-02-02
WO2007014855A1 (fr) 2007-02-08
FR2889362B1 (fr) 2007-10-19
CN101263631A (zh) 2008-09-10
JP2009504042A (ja) 2009-01-29
KR101274170B1 (ko) 2013-06-12
CN101263631B (zh) 2012-05-02

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