EP0987788A2 - Mehrband-Antenne - Google Patents

Mehrband-Antenne Download PDF

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Publication number
EP0987788A2
EP0987788A2 EP99118375A EP99118375A EP0987788A2 EP 0987788 A2 EP0987788 A2 EP 0987788A2 EP 99118375 A EP99118375 A EP 99118375A EP 99118375 A EP99118375 A EP 99118375A EP 0987788 A2 EP0987788 A2 EP 0987788A2
Authority
EP
European Patent Office
Prior art keywords
conductor
antenna
reactive element
cavity portion
helix
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Withdrawn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
EP99118375A
Other languages
English (en)
French (fr)
Other versions
EP0987788A3 (de
Inventor
Scott Anthony Faulkner
Veatriki Koutsoumpea
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.)
Whitaker LLC
Original Assignee
Whitaker LLC
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 Whitaker LLC filed Critical Whitaker LLC
Priority to EP99118375A priority Critical patent/EP0987788A3/de
Publication of EP0987788A2 publication Critical patent/EP0987788A2/de
Publication of EP0987788A3 publication Critical patent/EP0987788A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical 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
    • 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
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point

Definitions

  • This invention relates to an antenna for receiving at least two frequency bands, in particular for mobile communications devices such as cell phones, paging devices, GPS units, computer networking devices etc..
  • a dual frequency band antenna system is described US 5,717,409.
  • first frequency band first frequency band
  • second frequency band second frequency band
  • antenna systems to receive or transmit at least two frequency bands that are not necessarily harmonic multiples.
  • the dual frequency band antenna system comprises a first retractable rod and a second conductor comprising a helix concentrically surrounding a portion of the rod, both rod and helix interconnected to a mobile phone through a matching circuit of the phone.
  • Each of the antennas operate at first and second frequency bands.
  • the helical antenna is difficult to tune for operation in different phones, which have different electromagnetic characteristics.
  • Mobile phones form part of the "antenna system" and the particular construction of a phone (design of the ground plane etc.) affects the frequency response of the antenna.
  • Antennas thus often need to be tuned for operation in a mobile communications device of a particular construction.
  • the number of turns of the helix may be adjusted to tune the antenna to a particular mobile communications device. The latter is however a difficult and expensive process, particularly for mass production.
  • Another disadvantage of this system is the need for a matching circuit to perform the dual frequency band function.
  • a multiple frequency band antenna for mobile communication devices operable at least at first and second frequency bands, comprising a first conductor wound in a coil in the form of a spiral or helix around and along a longitudinal axis, the conductor of the helix separated from the longitudinal axis by a spacing that defines a central cavity portion, the first conductor extending from a connection end for connection to a signal processing circuitry of a mobile communication device, to a second free end, wherein the antenna further comprises a reactive element or a portion thereof positioned substantially immovably within the helix cavity portion, the reactive element and first conductor adapted to be electromagnetically coupled such that the first conductor and reactive element are operable at the first and second frequency ranges, where the frequencies of the second band are higher than the frequencies of the first band.
  • a particularly compact, simple and reliable antenna for intrinsic operation at multiple frequency bands is provided.
  • the antenna response can be accurately controlled and tuned for optimal performance
  • the length of the reactive element in longitudinal direction may be less than the length in the longitudinal direction of the first conductor.
  • the first conductor comprising the helix has an electrical length around 1/4 of the wavelength of the first center frequency (for example 850-900 MHz).
  • the reactive element positioned within the helix electromagnetically couples with the first conductor such that the antenna intrinsically resonates at both first and second frequency ranges.
  • the length and cross-sectional area of the reactive element may be adjusted to tune and optimise performance of the antenna at the first and second center frequencies for operation in a mobile communications device of a particular construction.
  • the reactive element may be a second conductor, for example in the form of a cylindrical rod. It is also conceivable to provide the reactive element from a non-conductive material, for example with inductive properties.
  • the reactive element may comprise a flange, for example a circular flange extending from a cylindrical rod forming the reactive element for positioning against the end of the first conductor so as to accurately position the reactive element within the first conductor, in particular such that the overlapping length of first conductor and reactive element is accurately defined in a simple manner.
  • the first conductor may, or may not be, electrically connected to the reactive element in the form of a second conductor at the end of the first conductor, for example electrical contact occurring between a outwardly extending flange of the second conductor abutting against the end of the first conductor helix, or alternatively the second conductor may be fixed via a dielectric in a non-conductive manner to the end of the first conductor helix.
  • the second conductor for example in the form of a rod, may be coated or positioned in a dielectric, where for example the outer diameter of the dielectric fits snugly within the cavity portion of the helix at the free end thereof such that the second conductor is radially located with respect to the first conductor and electrically insulated (except possibly at the first conductor free end) .
  • a particularly simple, compact and robust dual frequency band antenna is thus provided.
  • the antenna may be tuned by varying the dimensions of the reactive element in particular the length and/or cross-sectional area or diameter.
  • the antenna can thus be easily tuned for installation in mobile communications devices having different electromagnetic characteristics.
  • the second conductor may be provided as a continuation of the end of the first conductor, bent into the end of the helix cavity portion for a particularly cost-effective arrangement.
  • the need for a separate reactive element such as a second conductor and dielectric therearound to support the conductor is eliminated.
  • the first conductor may for example be in the form of a wire, such as a cylindrical or square profiled solid metal wire wound in a helix having a certain pitch and radius.
  • a certain length of the end of the wire may be bent into the cavity portion of the helix and extend along the center or longitudinal axis of the cavity, although it is also conceivable to position the second conductor in the cavity portion off-centre.
  • the connection end of the antenna may (but not necessarily) be in the form of a coaxial connection.
  • the first conductor connection portion may form the center conductor for connection to the center contact of a coaxial connector. Where the first conductor is in the form of a wire, the connection portion thereof may simply be a short length of straight wire extending in the longitudinal direction for example for plugging or soldering or otherwise fixing to a center conductor of a coaxial connector element or other conductor such as a PCB circuit trace.
  • the first conductor connection portion may be arranged in a dielectric to position the center conductor with respect to the coaxial connector or other connection.
  • the antenna helix and reactive element may be wrapped or coated or overmoulded in a dielectric outer sleeve (radome) that has good electrical properties (e.g. low dissipative properties) and further protects and holds the antenna together.
  • radome dielectric outer sleeve
  • a multiple frequency dual band antenna 2, 2' comprises a first conductor 4 and a reactive element which may be a second conductor 6, 6' but could also be a non-conductive element with inductive properties.
  • the first conductor 4 extends from a connection end 8 to a free end 10, the connection end for electrical connection to signal processing circuitry of a mobile communications device (not shown) such as a mobile telephone.
  • the first conductor 4 is in this embodiment in the form of a cylindrical wire 7 comprising a coil or helical section 12 extending around and along an axis (A) in a longitudinal direction (L).
  • the coil or helical section 12 is provided by winding the first conductor in a helix having an inner diameter (D) and a pitch (p) between successive coils or turns of the helix.
  • the helical section 12 defines an inner substantially cylindrical cavity portion 14 around the longitudinal center axis (A).
  • the first conductor may also be wound around in a square, polygonal, elliptical or other shape to define a non-cylindrical cavity portion. While a regular helix is preferred, it is possible to have a varying pitch between turns of a coil, and/or it is possible to have a coil with varying diameter (e.g. a conical shape).
  • the first conductor 4 is preferably a solid metal wire that has a regular helix formed along a section 12 thereof, other forms may be contemplated, for example by providing the outer conductor on a supporting substrate.
  • the first conductor may be printed or deposited as a conductive trace in the shape of a helix wound around a portion of a supporting substrate, such as a tube of dielectric material.
  • a wire or other conductor may be positioned in a spiral or helical form around a tube of substrate.
  • the first conductor may comprise a conductive trace on a flexible film, the flexible film then wound in a helix or bent into a cylindrical shaped and supported by a support element or structure such as a dielectric rod.
  • the diameter, pitch and number of turns of the first conductor are adapted, in conjunction with the electromagnetic coupling to the reactive element, to provide the first conductor substantially with an electrical length that enables it to resonate at the center of a first frequency band corresponding to the first frequency band at which the mobile communications device operates.
  • the center frequency of the first frequency band is approximately 850-900 MHz (depending on the standard).
  • connection end 8 of the first conductor comprises a substantially straight section 16 extending along the longitudinal axis (A) in the longitudinal direction (L) from a connection end 17 of the helical section 12.
  • connection end straight section 16 extends into the cavity 15 of a connection piece 19 which comprises an inner contact 13 surrounded by a dielectric 20, further concentrically surrounded by an outer conductor 22 that acts as the outer conductor of a coaxial connection.
  • the end 8 may thus be soldered or crimped or otherwise connected to the center contact 13 of the co-axial interconnection piece or conductor.
  • the end 8 may be directly connected (for example by soldering or welding) to a circuit board comprising signal processing circuitry of the mobile communication device, whereby no coaxial connection piece is provided.
  • the centre contact may also be formed by an integral extension of the connection end 8, as indicated in figure 1.
  • the connection piece is provided with a mounting flange 24 for securing on or around the edge of a cutout or hole in the casing of the mobile communications device or for lodging in a base 25 that may be fixed to a cap of the antenna.
  • the assembled antenna as shown in figures 1 and 4 can be mounted to a mobile communication device whereby the connection piece 19 plugs to a complementary connector of the device.
  • the reactive element 6 or a section thereof comprises a length (1, 1', 1'') of conducting, or material with inductive properties in the form of a rod (that in this embodiment is cylindrical but may also have a cross-sectional shape that is polygonal, elliptical or otherwise) that is inserted in the cavity portion 14 of the first conductor at the free end 10.
  • the reactive element or portion thereof positioned in the cavity portion extends therein along a length (1) starting from the free end 10, although the reactive element could also be positioned below the free end 10.
  • the reactive element could also have a portion extending a length (h) outside of the cavity portion, above the first conductor free end, as shown in figure 5.
  • the length (1) of rod has a diameter or width (d) smaller than the diameter or width (D) of the cavity portion 14 such that a dielectric spacing (W) is provided between the second and first conductors.
  • the diameter (or width) (d) and/or length (1) of the second conductor 6 may be varied in order to tune the antenna for operation around both first and second center frequencies of first and second frequency ranges of operation of the mobile communication device taking into account the electromagnetic characteristics of the mobile communication circuitry and device.
  • the second frequency range may for example be that of the personal communication system (PCS) with a center frequency of approximately 1900 MHz.
  • the frequencies of the second range are higher than the frequencies of the first range.
  • a dielectric jacket 28, 28', 28'' is positioned around the second conductor and fits within the cavity portion 14 thereby radially locating and insulating the reactive element with respect to the helical portion.
  • the reactive element may be provided with a radially extending flange 30, 30',30'' at the top end thereof that extends over the free end 10 of the first conductor for providing a shoulder 31, 31', 31'' that accurately locates the second conductor at the first conductor free end. This ensures that the depth into which the reactive element 6 is inserted in the cavity portion 14 is accurate and can be repeatably effected in a simple manufacturing process.
  • the immovable fixing of the reactive element to the first conductor also provides a well controlled and reliable antenna operable in multiple frequencies.
  • the free end of the first conductor 10 may conductively contact the reactive element (which may be a second conductor) at the top end 29, but it is also possible to provide the flange 30, 30', 30'' as part of the outer dielectric piece 28, 28', 28'' whereby the second conductor is not conductively connected to the first conductor.
  • the assembly shown in figure 1 may then be covered in a protective layer 38 that for example may be a radome or dielectric tube positioned thereover.
  • the above described arrangement enables provision of a multiple frequency band antenna that may be easily tuned and in particular that is cost-effective and easy to manufacture while providing a particularly reliable and robust construction.
  • the second conductor 6''' is an integral extension of the wire 7, bent into the cavity portion 14 from the free end 10 of the first conductor.
  • the antenna frequency response may be tuned by adjusting the length (1''') of the second conductor extending within the cavity portion 14.
  • a dielectric tube, rod or other structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP99118375A 1998-09-18 1999-09-16 Mehrband-Antenne Withdrawn EP0987788A3 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99118375A EP0987788A3 (de) 1998-09-18 1999-09-16 Mehrband-Antenne

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP98117699 1998-09-18
EP98117699 1998-09-18
EP99118375A EP0987788A3 (de) 1998-09-18 1999-09-16 Mehrband-Antenne

Publications (2)

Publication Number Publication Date
EP0987788A2 true EP0987788A2 (de) 2000-03-22
EP0987788A3 EP0987788A3 (de) 2003-04-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99118375A Withdrawn EP0987788A3 (de) 1998-09-18 1999-09-16 Mehrband-Antenne

Country Status (1)

Country Link
EP (1) EP0987788A3 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001099228A1 (en) * 2000-06-22 2001-12-27 Telefonaktiebolaget Lm Ericsson (Publ) An antenna for a portable communication apparatus, and a portable communication apparatus comprising such an antenna
DE10037472A1 (de) * 2000-08-01 2002-03-07 Siemens Ag Antenne, Verfahren zur Herstellung und Verfahren zur Montage
WO2002049152A1 (en) * 2000-12-12 2002-06-20 Moteco Ab Antenna device
FR2823018A1 (fr) * 2001-04-03 2002-10-04 Socapex Amphenol Antenne helice multibande
FR2823015A1 (fr) * 2001-03-29 2002-10-04 Samsung Electro Mech Antenne et son procede de fabrication
GB2376132A (en) * 2001-06-01 2002-12-04 David Ganeshmoorthy Helical antenna inside insulating cylinder
EP1263081A2 (de) * 2001-05-31 2002-12-04 Nec Corporation Wendelantenne
EP1291963A4 (de) * 2000-06-09 2003-03-12 Matsushita Electric Ind Co Ltd Antenne und funkgerät mit einer derartigen antenne
EP1318567A1 (de) * 2001-12-10 2003-06-11 Hewlett-Packard Company Gleichförmige Mehrband-Wendelantenne und damit versehene Kommunikationsvorrichtung
WO2004109854A1 (en) * 2003-06-06 2004-12-16 Koninklijke Philips Electronics N.V. Radio frequency antenna in a wireless device
WO2005057724A1 (en) * 2003-12-13 2005-06-23 Motorola, Inc Antenna
WO2006137677A1 (en) * 2005-06-20 2006-12-28 Mrw Communications Co., Ltd. Manufacturing method of portable antenna and apparatus using thereof
WO2017141635A1 (ja) * 2016-02-19 2017-08-24 株式会社ヨコオ アンテナ装置
CN107358287A (zh) * 2017-06-30 2017-11-17 上海仪电智能电子有限公司 一种轮胎电子标签的天线自动组装组件及方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852759A (en) * 1960-04-01 1974-12-03 Itt Broadband tunable antenna
US4214247A (en) * 1978-10-13 1980-07-22 Avnet, Incorporated Tunable fiberglass whip antenna
GB2206243A (en) * 1987-06-24 1988-12-29 Panorama Antennas Ltd Dual-frequency helical antenna
EP0528775A1 (de) * 1991-08-16 1993-02-24 Ericsson Inc. Miniaturantenne
JPH05136623A (ja) * 1991-11-11 1993-06-01 Sansei Denki Kk ２周波共用ヘリカルアンテナ、及び、その調整方法
JPH0637531A (ja) * 1992-07-17 1994-02-10 Sansei Denki Kk 広帯域ヘリカルアンテナ、および同製造方法
WO1998031069A1 (en) * 1997-01-07 1998-07-16 Galtronics Ltd. Helical antenna element

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852759A (en) * 1960-04-01 1974-12-03 Itt Broadband tunable antenna
US4214247A (en) * 1978-10-13 1980-07-22 Avnet, Incorporated Tunable fiberglass whip antenna
GB2206243A (en) * 1987-06-24 1988-12-29 Panorama Antennas Ltd Dual-frequency helical antenna
EP0528775A1 (de) * 1991-08-16 1993-02-24 Ericsson Inc. Miniaturantenne
JPH05136623A (ja) * 1991-11-11 1993-06-01 Sansei Denki Kk ２周波共用ヘリカルアンテナ、及び、その調整方法
JPH0637531A (ja) * 1992-07-17 1994-02-10 Sansei Denki Kk 広帯域ヘリカルアンテナ、および同製造方法
WO1998031069A1 (en) * 1997-01-07 1998-07-16 Galtronics Ltd. Helical antenna element

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 518 (E-1434), 17 September 1993 (1993-09-17) & JP 05 136623 A (SANSEI DENKI KK;OTHERS: 01), 1 June 1993 (1993-06-01) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 255 (E-1548), 16 May 1994 (1994-05-16) & JP 06 037531 A (SANSEI DENKI KK;OTHERS: 02), 10 February 1994 (1994-02-10) *

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1291963A1 (de) * 2000-06-09 2003-03-12 Matsushita Electric Industrial Co., Ltd. Antenne und funkgerät mit einer derartigen antenne
US6661391B2 (en) 2000-06-09 2003-12-09 Matsushita Electric Industrial Co., Ltd. Antenna and radio device comprising the same
EP1291963A4 (de) * 2000-06-09 2003-03-12 Matsushita Electric Ind Co Ltd Antenne und funkgerät mit einer derartigen antenne
WO2001099228A1 (en) * 2000-06-22 2001-12-27 Telefonaktiebolaget Lm Ericsson (Publ) An antenna for a portable communication apparatus, and a portable communication apparatus comprising such an antenna
US7053839B2 (en) 2000-06-22 2006-05-30 Telefonaktiebolaget L M Ericsson (Publ) Antenna for a portable communication apparatus, and a portable communication apparatus comprising such an antenna
DE10037472C2 (de) * 2000-08-01 2002-09-26 Siemens Ag Verfahren zum Einbau einer Antenne
DE10037472A1 (de) * 2000-08-01 2002-03-07 Siemens Ag Antenne, Verfahren zur Herstellung und Verfahren zur Montage
US6762732B2 (en) 2000-08-01 2004-07-13 Siemens Aktiengesellschaft Methods for assembling and installing an antenna
WO2002049152A1 (en) * 2000-12-12 2002-06-20 Moteco Ab Antenna device
AT501583B1 (de) * 2001-03-29 2007-05-15 Samsung Electro Mech Dualband-antenne und verfahren zu ihrer herstellung
FR2823015A1 (fr) * 2001-03-29 2002-10-04 Samsung Electro Mech Antenne et son procede de fabrication
AT501583A1 (de) * 2001-03-29 2006-09-15 Samsung Electro Mech Antenne und verfahren zu ihrer herstellung
FR2823018A1 (fr) * 2001-04-03 2002-10-04 Socapex Amphenol Antenne helice multibande
EP1263081A2 (de) * 2001-05-31 2002-12-04 Nec Corporation Wendelantenne
CN1327682C (zh) * 2001-05-31 2007-07-18 日本电气株式会社 螺旋线天线
EP1263081A3 (de) * 2001-05-31 2003-09-17 Nec Corporation Wendelantenne
US6710752B2 (en) 2001-05-31 2004-03-23 Nec Corporation Helical antenna
GB2376132A (en) * 2001-06-01 2002-12-04 David Ganeshmoorthy Helical antenna inside insulating cylinder
US6608605B2 (en) 2001-12-10 2003-08-19 Hewlett-Packard Development Company, L.P. Multi-band uniform helical antenna and communication device having the same
EP1318567A1 (de) * 2001-12-10 2003-06-11 Hewlett-Packard Company Gleichförmige Mehrband-Wendelantenne und damit versehene Kommunikationsvorrichtung
WO2004109854A1 (en) * 2003-06-06 2004-12-16 Koninklijke Philips Electronics N.V. Radio frequency antenna in a wireless device
WO2005057724A1 (en) * 2003-12-13 2005-06-23 Motorola, Inc Antenna
WO2006137677A1 (en) * 2005-06-20 2006-12-28 Mrw Communications Co., Ltd. Manufacturing method of portable antenna and apparatus using thereof
WO2017141635A1 (ja) * 2016-02-19 2017-08-24 株式会社ヨコオ アンテナ装置
US11456524B2 (en) 2016-02-19 2022-09-27 Yokowo Co., Ltd. Antenna device
US11855340B2 (en) 2016-02-19 2023-12-26 Yokowo Co., Ltd. Antenna device
CN107358287A (zh) * 2017-06-30 2017-11-17 上海仪电智能电子有限公司 一种轮胎电子标签的天线自动组装组件及方法
CN107358287B (zh) * 2017-06-30 2024-03-22 上海仪电智能电子有限公司 一种轮胎电子标签的天线自动组装组件及方法

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