EP1111717A1 - Antenne directionnelle a suppresseur d'interferences electromagnetiques - Google Patents

Antenne directionnelle a suppresseur d'interferences electromagnetiques Download PDF

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Publication number
EP1111717A1
EP1111717A1 EP99973945A EP99973945A EP1111717A1 EP 1111717 A1 EP1111717 A1 EP 1111717A1 EP 99973945 A EP99973945 A EP 99973945A EP 99973945 A EP99973945 A EP 99973945A EP 1111717 A1 EP1111717 A1 EP 1111717A1
Authority
EP
European Patent Office
Prior art keywords
antenna
electromagnetic interference
interference suppressor
antenna portion
holder
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Withdrawn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
EP99973945A
Other languages
German (de)
English (en)
Inventor
Kazuo Tokin Corporation MINEGISHI
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.)
Tokin Corp
Original Assignee
Tokin Corp
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 Tokin Corp filed Critical Tokin Corp
Publication of EP1111717A1 publication Critical patent/EP1111717A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
    • H01Q17/001—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems for modifying the directional characteristic of an aerial
    • 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
    • H01Q1/10—Telescopic 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
    • H01Q1/244—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 extendable from a housing along a given path
    • 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
    • H01Q1/245—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 means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
    • 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
    • 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
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole

Definitions

  • This invention relates to an antenna adapted for use in a mobile radio apparatus.
  • Each of these mobile radio apparatuses is assigned with a specific frequency for transmission and reception of a radio wave.
  • the above-mentioned specific frequency tends to be a high frequency.
  • the radio wave having a high frequency may possibly give an adverse influence upon a body of a user of the mobile radio apparatus.
  • a typical mobile telephone set makes use of an antenna of the type that a part of the antenna protrudes outside of a housing. This is because a primary object is to improve the sensitivity in transmission and reception.
  • Fig. 1 shows a conventional whip antenna of a top-loading type.
  • This antenna is disclosed in Japanese Unexamined Patent Publication (JP-A) No. 8-84017 (84017/1996) and comprises a first antenna portion 30 as a whip element, a stopper portion 35 connected to a bottom end of the first antenna portion 30, a sleeve portion 36 formed at a top end of the first antenna portion 30, and a second antenna portion 40 connected to a top end of the sleeve portion 36.
  • the second antenna portion 40 comprises a bobbin portion 47, a helical coil 42 wound around the bobbin portion 47, and a resin coating portion 41a covering the bobbin portion 47 and the helical coil 42.
  • the resin coating portion 41a serves to improve the radiation efficiency and the appearance of the second antenna portion 40.
  • the resin coating portion 41a is formed by a material which can minimize the adverse influence upon antenna characteristics.
  • the antenna characteristics include the directivity and the gain. It is desired for the mobile telephone sets that the antenna is nondirectional or omnidirectional and has a high gain.
  • Fig. 2 shows another conventional whip antenna of a bottom-loading type.
  • the antenna is disclosed in Japanese Unexamined Patent Publication (JP-A) No. 8-503830 (503830/1996) and comprises a first antenna portion 50 as a whip element held by a housing 51 of a telephone set, a second antenna portion 60 as a bottom-loading element covering a bottom end of the first antenna portion 50, and a stopper portion 65 formed at a bottom end of the second antenna portion 60.
  • the second antenna portion 60 is provided with a helical coil 52.
  • each of the conventional whip antennas illustrated in Figs. 1 and 2 simply aims to improve the reception sensitivity without considering the influence upon the human body by the radio wave radiated from the antenna.
  • JP-A Japanese Unexamined Patent Publication
  • JP-A Japanese Unexamined Patent Publication
  • 9-46756 (46756/1997) describes an antenna having an antenna cover made of a radio absorbing material and attached via a shaft to a fixing member formed at a base of the antenna.
  • JP-A Japanese Unexamined Patent Publication
  • JP-A Japanese Unexamined Patent Publication
  • 9-223888 discloses a technique of shielding an electromagnetic wave radiated from an antenna by the use of an electromagnetic wave shielding plate having a hook to engage an antenna of a mobile telephone set.
  • Japanese Utility Model Application No. 59-22598 discloses an antenna comprising at least two linear radiation elements arranged in close proximity of each other and a radio absorber interposed between the linear radiation elements.
  • JP-A Japanese Unexamined Patent Publication
  • JP-A No. 64-37106 (37106/1989) discloses an antenna comprising an antenna body covered with a radio absorber matching a radar frequency.
  • JP-A Japanese Unexamined Patent Publication
  • JP-A Japanese Unexamined Patent Publication
  • JP-A Japanese Unexamined Patent Publication
  • JP-A Japanese Unexamined Patent Publication
  • JP-A Japanese Unexamined Patent Publication
  • an antenna having an electromagnetic interference suppressor which comprises a composite magnetic member containing soft magnetic powder having an oxide film layer and which covers a part of the periphery of the antenna.
  • the electromagnetic interference suppressor may cover one side or a half of the periphery.
  • the antenna may comprise a first antenna portion slidably held by a housing of a radio apparatus, and a second antenna portion connected to one end of the first antenna portion.
  • the electromagnetic interference suppressor may be arranged in at least one of the first and the second antenna portions.
  • the antenna may further comprise a holder portion slidably holding the first antenna portion and fixedly attached to the housing of the radio apparatus, a stopper portion fixedly attached to one end of the first antenna portion to serve as a feeding portion for the first antenna portion when the antenna is pulled out, and a sleeve portion formed at the other end of the first antenna portion and connected to the second antenna portion.
  • the orientation of the electromagnetic interference suppressor may be preliminarily determined by coupling of the holder portion and the stopper portion.
  • the orientation of the electromagnetic interference suppressor may be preliminarily determined by coupling of the holder portion and the sleeve portion.
  • the second antenna portion may be one of a stick type, a helical type, and a dielectric-resonance type.
  • the electromagnetic interference suppressor may be covered with an insulating coating portion.
  • the electromagnetic interference suppressor may have an electromagnetic absorber.
  • the electromagnetic interference suppressor may be provided by adhesion, fitting, or painting.
  • the directional antenna comprises a holder portion (antenna-holding fixture) 4 fixedly attached to a housing 1 of a mobile radio apparatus, a first antenna portion 10 held by the holder portion 4 to be slidable in the vertical direction, a stopper portion 5 fixedly attached to a bottom end of the first antenna portion 10 to be coupled to the holder portion 4 and serve as a feeding portion for the first antenna portion 10 when the antenna is pulled out, a sleeve portion 6 attached to a top end of the first antenna portion 10 to be coupled to the holder portion 4 when the first antenna portion 10 is retreated, a second antenna portion 20 formed at a top end of the sleeve portion 6, and an electromagnetic interference suppressor 3 formed at a desired part of a circumference of each of the first and the second antenna portions 10 and 20 so as to shield an electromagnetic wave.
  • the electromagnetic interference suppressor 3 is formed at one side or a half of the circumference of each of the first and the second antenna portions 10 and 20.
  • the electromagnetic interference suppressor 3 may be provided by adhesion, fitting, or painting.
  • the housing 1 is also provided with an electromagnetic interference suppressor similar to the electromagnetic interference suppressor 3 provided in each of the first and the second antenna portions 10 and 20.
  • the first antenna portion 10 comprises a whip element 8, the electromagnetic interference suppressor 3 formed at the outer periphery of the whip element 8, and a first coating portion 9a formed on the outer periphery of the electromagnetic interference suppressor 3.
  • the whip element 8 may be made of a Ti-Ni alloy or an ordinary wire such as a stainless steel wire and a piano wire.
  • the first coating portion 9a may be formed by fitting an insulating tube or molding an insulating resin material.
  • the second antenna portion 20 is connected to a top end of the whip element 8. As shown in Fig. 6 also, the second antenna portion 20 has the sleeve portion 6 to serve as the feeding portion and a helical coil 2 to perform an antenna function when the antenna is retreated.
  • the helical coil 2 is wound around a helical guide portion 7.
  • the electromagnetic interference suppressor 3 is formed outside of the helical coil 2 and the helical guide portion 7. Thus, the helical coil 2 and the helical guide portion 7 are covered by the electromagnetic interference suppressor 3 to shield the electromagnetic wave.
  • the electromagnetic interference suppressor 3 is covered with a second coating portion lla having an insulating nature.
  • the second coating portion lla may be formed by molding an insulating resin material to enclose the electromagnetic interference suppressor 3.
  • the second coating portion 11a may be formed by fitting an insulating resin cap to the electromagnetic interference suppressor 3.
  • an antenna top portion 11 protected by the second coating portion 11a is formed.
  • the above-mentioned directional antenna is arranged so that the electromagnetic interference suppressor 3 is always faced to a human body when the mobile radio apparatus is used.
  • This arrangement is implemented by a positioning structure formed at a coupling portion of the holder portion 4 and the stopper portion 5 or a coupling portion of the holder portion 4 and the sleeve portion 6 to uniquely determine the orientation of the electromagnetic interference suppressor 3 with respect to the holder portion 4.
  • the electromagnetic interference suppressor 3 is oriented in a same direction at the first and the second antenna portions 10 and 20. Then, the orientation when the antenna is pulled out can be determined by a coupling state of the holder portion 4 and the stopper portion 5.
  • the orientation when the antenna is retreated can be determined by a coupling state of the holder portion 4 and the sleeve portion 6. Specifically, by coupling these portions as a combination of irregular shapes like a jigsaw puzzle, the electromagnetic interference suppressor 3 can be oriented in a predetermined direction.
  • the electromagnetic interference suppressor 3 use may be made of a product manufactured and sold by Tokin Corporation, Sendai, Japan under the trade name of "BUSTERAID".
  • the technique related to "BUSTERAID” is described in detail in Japanese Unexamined Patent Publication (JP-A) No. 9-93034 (93034/1997).
  • the electromagnetic interference suppressor described in the above-mentioned publication is made of soft magnetic powder having a magnetostrictive constant not equal to zero and shaped into a flattened configuration. After shaping, the soft magnetic powder has an average thickness smaller than a skin depth of a desired composite magnetic member at a used frequency.
  • the soft magnetic powder has as a dielectric layer an oxide film layer formed at least on a surface thereof.
  • a combination of annealing treatment and the above-mentioned soft magnetic powder provides the composite magnetic member having a high-frequency magnetic permeability controllably varied within a wide range.
  • an element 15 is provided by molding or press-fitting.
  • the helical guide portion 7 formed by molding or the like is fitted by press-fitting or screwing.
  • the helical coil 2 is wound around the helical guide portion 7.
  • the helical coil 2 is further wound around the sleeve portion 6 and connected by one of press-fitting, soldering, and screwing.
  • the electromagnetic interference suppressor 3 is provided on a half of the circumference of the helical coil 2 wound around the helical guide portion 7.
  • the second coating portion lla is formed.
  • the second antenna portion 20 is formed.
  • the electromagnetic interference suppressor 3 is provided around the whip element 8. Then, the first coating portion 9a is formed to protect the whip element 8 and the electromagnetic interference suppressor 3. Thus, the first antenna portion 10 is formed. The top end of the first antenna portion 10 is fitted and fixed to the bottom end of the sleeve portion 6.
  • the holder 4 is fitted to the first antenna portion 10. Thereafter, the stopper portion 5 is fitted.
  • the bottom end of the whip element 8 is deformed to provide an enlarged portion which is press-fitted into the stopper portion 5 to secure the whip element 8 and the stopper portion 5 to each other.
  • the directivity on the one side is broken by a simple structure. Therefore, by facing the one side toward the human body, it is possible to suppress the influence upon the human body.
  • the electromagnetic interference suppressor 3 may be provided in only one of the first and the second antenna portions 10 and 20.
  • the second antenna portion 20 may be implemented by a stick type or a dielectric resonance type.
  • the directional antenna according to this invention is useful as an antenna of a radio apparatus such as a mobile telephone set.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Aerials With Secondary Devices (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
EP99973945A 1998-01-27 1999-06-29 Antenne directionnelle a suppresseur d'interferences electromagnetiques Withdrawn EP1111717A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10013877A JPH11214912A (ja) 1998-01-27 1998-01-27 指向性アンテナ
PCT/JP1999/003493 WO2001001519A1 (fr) 1998-01-27 1999-06-29 Antenne directionnelle a suppresseur d'interferences electromagnetiques

Publications (1)

Publication Number Publication Date
EP1111717A1 true EP1111717A1 (fr) 2001-06-27

Family

ID=26349736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99973945A Withdrawn EP1111717A1 (fr) 1998-01-27 1999-06-29 Antenne directionnelle a suppresseur d'interferences electromagnetiques

Country Status (8)

Country Link
EP (1) EP1111717A1 (fr)
JP (1) JPH11214912A (fr)
CN (1) CN1315065A (fr)
AU (1) AU4291399A (fr)
CA (1) CA2339844A1 (fr)
NO (1) NO20011014L (fr)
TW (1) TW466799B (fr)
WO (1) WO2001001519A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996021254A1 (fr) * 1995-01-05 1996-07-11 Paul Francis Bickert Antenne perfectionnee pour dispositif de communication radio portable
JPH0946756A (ja) * 1995-07-29 1997-02-14 Toru Ito 携帯電話のアンテナカバー
JPH0993034A (ja) * 1995-09-22 1997-04-04 Tokin Corp 複合磁性体及びその製造方法ならびに電磁干渉抑制体
JPH09294104A (ja) * 1996-04-25 1997-11-11 Sony Corp アンテナ装置及び携帯無線機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0101519A1 *

Also Published As

Publication number Publication date
CA2339844A1 (fr) 2001-01-04
NO20011014D0 (no) 2001-02-27
AU4291399A (en) 2001-01-31
CN1315065A (zh) 2001-09-26
TW466799B (en) 2001-12-01
WO2001001519A1 (fr) 2001-01-04
NO20011014L (no) 2001-04-10
JPH11214912A (ja) 1999-08-06

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