EP1589608A1 - RF kompakte Antenne - Google Patents

RF kompakte Antenne Download PDF

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Publication number
EP1589608A1
EP1589608A1 EP05290885A EP05290885A EP1589608A1 EP 1589608 A1 EP1589608 A1 EP 1589608A1 EP 05290885 A EP05290885 A EP 05290885A EP 05290885 A EP05290885 A EP 05290885A EP 1589608 A1 EP1589608 A1 EP 1589608A1
Authority
EP
European Patent Office
Prior art keywords
radiant
antenna
antenna according
compact
counterweight
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.)
Withdrawn
Application number
EP05290885A
Other languages
English (en)
French (fr)
Inventor
Ayoub Annabi
Daniel Leclerc
Frédéric DIXIMUS
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.)
Amphenol Socapex SA
Original Assignee
Amphenol Socapex 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 Amphenol Socapex SA filed Critical Amphenol Socapex SA
Publication of EP1589608A1 publication Critical patent/EP1589608A1/de
Withdrawn legal-status Critical Current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
    • 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
    • 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

Definitions

  • the present invention relates to a compact antenna of monopole type for the transmission and reception of signals, suitable for used in particular but not exclusively in a portable terminal operating at different frequency bands.
  • the specifications of an antenna must meet at least two requirements: on the one hand the antenna must be able to function at different frequency bands of the types of networks available and, on the other hand, the dimensions of the antenna must adapt to increasingly smaller dimensions of the terminals.
  • An object of the present invention is to provide an antenna compact used in a portable terminal that has a very low volume and can be used at cellular frequency bands distinct.
  • the radiant element presents the form of an open loop with two branches connected together to the antenna cable and which define a first and a second part radiant, in that each of the radiating parts is able to enter into resonance at at least one cellular frequency and extends into a direction, and that these two main directions are substantially parallel so as to operate as a parasite and coupling between the two radiating parts.
  • the radiating parts and the counterweight present in the form of metal plates fixed on a support dielectric. It is however possible to realize the antenna by metallization a rigid or flexible dielectric substrate.
  • the compact antenna preferably extends longitudinally and the main directions of the radiating parts are parallel to the direction longitudinal axis of the compact antenna.
  • the compact antenna is designed to work the main cellular frequencies of telephony: in particular GSM 850/900, DCS 1800, PCS 1900 and UMTS 2100 frequencies.
  • the two radiating parts are arranged close to each other so that the phenomena of coupling or parasite can appear in order to widen the bandwidth of the antenna.
  • the open loop has the shape of an element closing almost on itself and whose opening has a very small length compared to the total length of item.
  • the loop has only one opening, but we could very well make several openings in the loop.
  • the counterweight and the conductive surface have a connection area unique.
  • the first radiant part is a surface substantially flat conductor, a portion of which is a juxtaposition of identical patterns extending in a substantially orthogonal direction at the main direction of the first radiant part.
  • said pattern is substantially V-shaped so that the first radiant part has the shape of a zigzag extending in the main direction.
  • said portion comprises at least four patterns identical.
  • the unfolded length of the first part radiant is substantially proportional to quarter of the wavelength of the wave having a central frequency substantially equal to the frequency the lowest cell.
  • the lowest center frequency is a GSM frequency substantially equal to 900 MHz.
  • the unfolded length of the first radiant part roughly equal to the length of the first part radiant if it was rectilinear.
  • the unfolded length of the first part radiant substantially corresponds to the unfolded length of a pattern multiplied by the number of patterns composing the first radiant part.
  • the second radiant part is a conductor substantially rectilinear extending in the main direction of said second radiant part.
  • the second radiant portion has a shape substantially rectangular.
  • the second radiant part can also be composed of several rectilinear elements extending all in the main direction of the second radiant part.
  • the length of the second radiant portion is substantially proportional to a quarter of the wavelength having a central frequency substantially equal to the highest cell frequency high.
  • the highest cell frequency is a UMTS frequency substantially equal to 2100 MHz.
  • the length of the radiant portion is substantially equal to the length of the rectilinear conductor.
  • the compact counterweight comprises an axis of symmetry parallel to the main direction of the first radiant part and in that it comprises at least one U-shaped portion comprising a first and a second branch and whose first branch is connected to the connection area of said compact counterweight.
  • said at least one portion of conductor shaped "U" has two rectilinear branches each extending in a direction substantially parallel to the axis of symmetry of the compact counterweight.
  • the compact counterweight comprises two U-shaped portions, the second branches of which are arranged in vis-a-vis.
  • the two U-shaped portions are symmetrical with respect to the axis of symmetry of the counterweight and the second branches of the U-shaped portions are parallel and arranged close to each other.
  • the compact counterweight furthermore comprises at least one rectilinear portion of conductor extending into a direction parallel to the axis of symmetry of the compact counterweight and a end of said rectilinear portion is connected to the connection area of the compact counterweight.
  • said rectilinear portion of a conductor is parallel to the first and second branches of a shaped portion "U".
  • the rectilinear portion extends substantially between the two branches of a U-shaped portion.
  • the lengths of the branches of a portion "U" and a rectilinear portion are substantially equal.
  • a compact antenna 10 will first be described in its first embodiment.
  • the compact antenna 10 is designed to operate at the frequencies of the mobile telephony: GSM 850/900, DCS 1800, PCS 1900 and UMTS 2100 MHz.
  • the lowest cell frequency is approximately 850 MHz and the highest cell frequency is about 2100 MHz.
  • the compact antenna 10 is here in the form of an electrical circuit printed on an insulator not shown here.
  • This insulator commonly called dielectric can be made for example FR4 epoxy glass.
  • the compact antenna 10 comprises a first conductive surface forming a radiant element 12 and a second conductive surface forming a counterweight 14, which can also be called a ground plane.
  • the conductive surfaces are preferably substantially flat and made of copper.
  • the compact antenna 10 extends mainly in a longitudinal direction.
  • the radiant element has substantially the shape of an open loop composed of two conductive branches 16, 18 extending substantially in principal directions parallel to the longitudinal direction of the compact antenna 10.
  • the two branches are electrically connected together at one of their ends at an electrical connection zone 20.
  • connection area will be called in all the rest of the description: zone of connection of the radiant element.
  • the first branch 16 of the radiating element 12 comprises a first portion 22 forming a zigzag, that is to say a juxtaposition of patterns substantially “V" connected together by the ends of the bars of the "V".
  • V the "V" patterns are oriented substantially in a direction orthogonal to the longitudinal direction of the radiant element.
  • the portion 22 forming a zigzag comprises four "V" patterns and the end of the last "V" pattern opposite to the connection zone is connected to an end portion 24 terminating the first branch 16 .
  • This first branch 16 forms a first radiant portion capable of radiating preferably at frequencies belonging to the GSM frequency band, that is to say at frequencies between 850 and 1000 MHz.
  • the portion 22 forming a zigzag has a length substantially equal to one quarter of the wavelength having a central frequency a GSM frequency between 850 and 1000 MHz, and preferably substantially equal to 900 MHz.
  • the second branch 18 of the radiating element 12 comprises a substantially rectangular portion of conductor 26 extending in the longitudinal direction of the compact antenna 10 .
  • this rectangular portion 26 is substantially proportional to one-quarter of the wavelength for the highest central frequency between 1700 and 2100 MHz, preferably equal to 1900 MHz.
  • the unfolded length of the zigzag portion 22 is preferably substantially equal to twice the length of the rectangular portion 26 .
  • the radiant element 12 forms an open loop. That is to say, there is an opening 28, forming a space between the ends of the branches 16, 18 opposite the ends connected to each other.
  • This opening 28 is preferably located between the end portion 24 terminating the branch 22 and the end of the rectangular portion 26 .
  • the end portion 24 has the shape of an "L" of which at least one of the arms has a rectangular shape 24 ' whose width is substantially equal to the width of the rectangular portion 26.
  • the unfolded length of the end portion 24 is preferably small relative to the unfolded length of the zigzag portion 22 .
  • the width of the opening 28 ie the distance separating the ends of the two branches is substantially equal to the width of the rectangular portion 26 . In any case, it is much less than one tenth of the wavelength for the highest frequency.
  • the rectangular portion 26 is relatively close to the ends of the bars of the "V" patterns. More precisely, the distance separating one end of a "V" pattern is much less than one-tenth of the wavelength for the highest cell frequency.
  • connection zone 20 of the radiating element 12 is preferably electrically connected to a central conductor 30 of a connector 31 adapted to be connected to a supply line 32 .
  • the supply line is a coaxial cable impedance 50 Ohms.
  • This supply line also comprises a shield 34 electrically connectable to a peripheral conductor 29 of the connector 31 , which is electrically connected to a connection zone 36 of the counterweight 14 and electrically isolated from the connection zone 20 of the radiating element 12 .
  • This counterweight 14 has an axis of symmetry which extends parallel to the longitudinal direction of the compact antenna 14 .
  • this axis of symmetry passes substantially through the center of the connection zone 36 of the counterweight 14 .
  • the counterweight 14 has two portions 38, 38 ' U-shaped and two straight portions 40, 40' .
  • the two U-shaped portions and the two rectilinear portions being symmetrical to each other, only one U-shaped portion 38 and a single straight portion 40 will be described hereinafter.
  • the "U" shaped portion 38 has a first branch 42 whose end is electrically connected to the connection zone 36 of the counterweight 14 and a second branch 44 .
  • the two branches 42, 44 of the U-shaped portion are parallel to each other and extend each parallel to the longitudinal direction of the compact antenna.
  • the "U" shaped portion is arranged such that the second leg 44 is located between the first leg 42 and the axis of symmetry of the counterweight.
  • the rectilinear portion 40 of substantially rectangular shape is electrically connected to the connection zone 36 of the counterweight 14 at one of its ends and extends in a direction parallel to the longitudinal direction of the compact antenna 10.
  • the other end of the rectilinear portion extends between the two branches 42, 44 of the U-shaped portion so that said branches substantially border all of the lateral edges of the rectilinear portion 40 .
  • the distance between these two branches is very less than twentieth of the wavelength for cell frequency the highest, that is to say of the order of a millimeter.
  • the unfolded length of the "U" shaped portion 38 of the counterweight 14 is preferably substantially equal to or slightly greater than the unfolded length of the zigzag portion 22 .
  • the length of the rectilinear portion 40 of the counterweight 14 is preferably substantially equal to or slightly greater than the length of the rectangular portion 26 of the radiating element 12 .
  • the radiant portion whose length is substantially equal to a quarter of the wavelength enters into resonance .
  • the zigzag portion 22 of the first branch 16 of the radiant element 12 that resonates.
  • the distribution of the currents 46 is therefore more particularly located on the zigzag portion and on the connection zone 20 .
  • the electrical equilibrium involves in known manner a current distribution on a ground plane 14 in return for the distribution of the currents 46 on the radiating element 12 .
  • the counterweight 14 acts as a compact ground plane.
  • the distribution of currents on the counterweight is preferably localized on the U-shaped portions 38 , 38 ' as schematically shown in FIG. 4 , whereas the rectangular portions 40 are practically not covered. by the currents.
  • the radiant portion whose length is substantially equal to one quarter of the wavelength of said wave goes into resonance. In other words, it is the rectangular portion 26 that comes into resonance.
  • the current distribution on the counterweight is such that they are spread over the portion of the counterweight whose length is close to quarter of the wavelength for the frequency band considered.
  • the distribution of the currents on the compact counterweight 14 is more particularly located on the connection zone 36 and on the rectilinear portions 40, 40 ' .
  • the compact counterweight 14 fulfills the function of double ground plane at the frequencies of use. 'antenna.
  • the abscissa represents the frequency applied to the supply line 32 of the antenna 10 .
  • the frequency is expressed in Gigahertz and the spectrum varies between 0.8 GHz and 2.3 GHz.
  • the ordinate axis represents the gain in dBi of the antenna compact.
  • the gain of the antenna is high and is between 0 and 1 dBi.
  • This frequency band 48 close to 0.9 GHz corresponds substantially to the frequency band GSM 850/900 MHz.
  • the antenna is therefore adapted to this band of frequencies.
  • the gain of the antenna is particularly high for frequencies between 1700 MHz and 2200 MHz.
  • This frequency band 50 is relatively wide and corresponds to the frequency bands DCS 1800, PCS 1900 and UMTS 2100.
  • the antenna is therefore adapted to these frequency bands.
  • the width of this frequency band is notably due to the proximity of the rectangular portion 26 and the zigzag portion 22.
  • the compact antenna of the present invention is suitable for both GSM and UMTS frequency bands.
  • FIG. 2 represents a second embodiment of the compact antenna 100 in which the radiating element 120 is identical to that of the first embodiment of the compact antenna and in which the counterweight is identical except that it does not has no rectilinear portions as in the first embodiment.
  • the branches 440, 440 ' are disposed close to each other and also close to the branches 420 so as to promote the phenomena of coupling and parasitism.
EP05290885A 2004-04-23 2005-04-21 RF kompakte Antenne Withdrawn EP1589608A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0404311 2004-04-23
FR0404311A FR2869467A1 (fr) 2004-04-23 2004-04-23 Antenne compacte rf

Publications (1)

Publication Number Publication Date
EP1589608A1 true EP1589608A1 (de) 2005-10-26

Family

ID=34942181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05290885A Withdrawn EP1589608A1 (de) 2004-04-23 2005-04-21 RF kompakte Antenne

Country Status (4)

Country Link
US (1) US20050237244A1 (de)
EP (1) EP1589608A1 (de)
JP (1) JP2005312062A (de)
FR (1) FR2869467A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333901A3 (de) * 2009-12-11 2011-07-13 Samsung Electronics Co., Ltd. Antennenvorrichtung
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006510321A (ja) 2002-12-22 2006-03-23 フラクタス・ソシエダッド・アノニマ 移動通信デバイス用のマルチバンド・モノポール・アンテナ
EP1714353A1 (de) 2004-01-30 2006-10-25 Fractus, S.A. Mehrband-monopolantennen für mobil-netzwerkkommunikations-einrichtungen
EP1709704A2 (de) 2004-01-30 2006-10-11 Fractus, S.A. Mehrband-monopolantennen für mobilkommunikationsgeräte
GB0512281D0 (en) * 2005-06-16 2005-07-27 Antenova Ltd Resonant devices to improve antennna performance in handsets and data terminals
JP4522386B2 (ja) * 2006-03-27 2010-08-11 富士通株式会社 アンテナ及び無線装置
JP4868128B2 (ja) * 2006-04-10 2012-02-01 日立金属株式会社 アンテナ装置及びそれを用いた無線通信機器
KR100664552B1 (ko) 2006-05-25 2007-01-03 주식회사 모비너스 이동통신 단말기용 다중대역 칩 안테나
WO2007145097A1 (ja) * 2006-06-15 2007-12-21 The Furukawa Electric Co., Ltd. アンテナ
JP4909962B2 (ja) * 2008-09-09 2012-04-04 株式会社東芝 マルチバンドアンテナ
EP2673840A4 (de) * 2011-02-08 2014-11-26 Taoglas Group Holdings An einer doppelbandserie ausgerichtete komplementäre doppel-v-antenne sowie herstellungsverfahren und kits dafür
US8870069B2 (en) 2012-08-22 2014-10-28 Symbol Technologies, Inc. Co-located antenna arrangement
TWM551355U (zh) 2015-11-11 2017-11-01 陶格拉斯集團控股有限公司 具有多個接地共振器之可撓性聚合物天線
CN106684535A (zh) * 2017-02-28 2017-05-17 胡洁维 一种天线
TWI806241B (zh) * 2021-11-16 2023-06-21 和碩聯合科技股份有限公司 天線模組及電子裝置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926139A (en) * 1997-07-02 1999-07-20 Lucent Technologies Inc. Planar dual frequency band antenna
US6459413B1 (en) * 2001-01-10 2002-10-01 Industrial Technology Research Institute Multi-frequency band antenna
US6559809B1 (en) * 2001-11-29 2003-05-06 Qualcomm Incorporated Planar antenna for wireless communications
US20030210203A1 (en) * 2002-05-09 2003-11-13 Phillips James P. Sensor-driven adaptive counterpoise antenna system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1258945A3 (de) * 2001-05-16 2003-11-05 The Furukawa Electric Co., Ltd. Linienförmige Antenne
CN100379084C (zh) * 2003-01-16 2008-04-02 松下电器产业株式会社 天线

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5926139A (en) * 1997-07-02 1999-07-20 Lucent Technologies Inc. Planar dual frequency band antenna
US6459413B1 (en) * 2001-01-10 2002-10-01 Industrial Technology Research Institute Multi-frequency band antenna
US6559809B1 (en) * 2001-11-29 2003-05-06 Qualcomm Incorporated Planar antenna for wireless communications
US20030210203A1 (en) * 2002-05-09 2003-11-13 Phillips James P. Sensor-driven adaptive counterpoise antenna system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9899727B2 (en) 2006-07-18 2018-02-20 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US10644380B2 (en) 2006-07-18 2020-05-05 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11031677B2 (en) 2006-07-18 2021-06-08 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11349200B2 (en) 2006-07-18 2022-05-31 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US11735810B2 (en) 2006-07-18 2023-08-22 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
EP2333901A3 (de) * 2009-12-11 2011-07-13 Samsung Electronics Co., Ltd. Antennenvorrichtung

Also Published As

Publication number Publication date
US20050237244A1 (en) 2005-10-27
FR2869467A1 (fr) 2005-10-28
JP2005312062A (ja) 2005-11-04

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