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WO1997033340A1 - Dispositif d'affaiblissement de la sortie d'une antenne - Google Patents

Dispositif d'affaiblissement de la sortie d'une antenne Download PDF

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Publication number
WO1997033340A1
WO1997033340A1 PCT/SE1997/000256 SE9700256W WO9733340A1 WO 1997033340 A1 WO1997033340 A1 WO 1997033340A1 SE 9700256 W SE9700256 W SE 9700256W WO 9733340 A1 WO9733340 A1 WO 9733340A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
supply point
reducing
output
ferromagnetic
Prior art date
Application number
PCT/SE1997/000256
Other languages
English (en)
Inventor
Carl Gustaf Blom
Original Assignee
Moteco Ab
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 Moteco Ab filed Critical Moteco Ab
Publication of WO1997033340A1 publication Critical patent/WO1997033340A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3833—Hand-held transceivers
    • 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
    • H01Q1/12—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

Definitions

  • the present invention relates to a device for reducing the energy radiated from an antenna in a radio communications apparatus, the antenna being connected to a transmitter via a supply point.
  • the antenna in daily parlance mobile telephones, the antenna is placed in such a manner that it is located closely adjacent the user's head. During those periods when the apparatus is transmitting, a part of the radiated energy will be absorbed in the head tissue of the user. The amount of energy that can be absorbed in the head tissue of the user without injury or risk of injury is a matter for debate. A measurement of the absorbed energy discloses the so-called “sar” value (specific absorption rate). An upper limit for this "sar" value is to be established.
  • the present invention has for its object to design the device intimated by way of introduction such that the above-considered problems are obviated.
  • the present invention has for its object to realise a device which permits an accurately adapted reduction of the radiated energy from a transmitter antenna without sensitivity on reception being negatively affected to any appreciable degree.
  • the present invention also has for its object to realise a device which is simple and economical in manufacture and which has a long service life.
  • the device according to the invention is characterized in that there is disposed, in the region of the supply point of the antenna, a body of ferromagnetic, soft material.
  • the ferromagnetic material is a ferrite.
  • Fig. 1 is a cross section through a lower portion of a rod antenna
  • Fig. 2 is a cross section through a helix antenna. DESCRIPTION OF PREFERRED EMBODIMENTS
  • reference numeral 1 relates to an outer casing, or housing, of electrically insulating, non-magnetic material.
  • a radiator 2 which, in this embodiment, is designed as a rod.
  • the radiator 2 merges in a signal conductor 3 which extends through a sleeve 4 of insulating material in the connection terminal 5 of the antenna.
  • the antenna has a supply point 6 which may be defined as that point along the conductor consisting of the components 2 and 3 where the upper portion of the conductor begins to function as a radiator. In the Drawings, the supply point 6 is located just above the upper end of the insulating sleeve 4.
  • a body 7 of ferromagnetic, soft material In the region of the supply point 6 of the antenna, there is disposed a body 7 of ferromagnetic, soft material.
  • this body is tubular or cylindrical and is disposed coaxially about the metallic conductor 2, 3 of the antenna.
  • the body 7 will deflect or drain energy from the antenna, this energy being converted to heat in the body.
  • the body 7 is thermally connected to a heat reducer, i.e. a body which has the capacity to absorb and lead off heat.
  • this heat reducer is realised in that the body 7 is cast in a non-electrically conductive plastic material which may be disposed to fill out the space interiorly in the outer casing 1 of the antenna.
  • ferrites have proved to be particular suitable.
  • the term ferrite in this context is taken to signify a sintered ceramic, micro crystalline material with a spatially centred cubic crystal lattice.
  • the material consists of iron oxide (Fe2Q3) and a metal mixture.
  • the most common combinations in the metal mixture are manganese / zinc and nickel /zinc.
  • a ferrite quality which is available from Philips carrying material designation 4S2 has proved to be especially usable within the pertinent frequency range of from 400 MHz to 2 GHz.
  • the damping of the energy radiated from the radiator 2 which is realised by the body 7 is approximately proportional to the axial length of the body 7.
  • the damping which is achieved of the radiated energy is non-linear in relation to the output supplied to the antenna.
  • the damping is very low in low outputs, in order subsequently to increase and once again fade at high outputs.
  • the body 7 may be adapted in such a manner that it only gives insignificant damping of the antenna performance on reception, since the output handled by the antenna is then very modest, while the intended damping is achieved on transmission, when the output handled by the antenna is considerably greater.
  • This phenomenon entails major advantages in systems operating in simplex, i.e. when transmission and reception take place separately in time.
  • the advantages are also great in such systems (e.g. GSM) in which transmission takes place intermittently, while probably no - or only insignificant - advantages will be attained in systems which operate in full duplex, i.e. when transmission and reception take place simultaneously.
  • Fig. 2 The embodiment illustrated in Fig. 2 is wholly analogous with the embodiment according to Fig. 1 apart from the fact that the radiator 2 is designed as a helix, which gives a considerably shorter construction length of the antenna.
  • An antenna of this type is extra critical as regards the "sar" value, since it is physically short and is therefore located very close to the user's head.
  • Fig. 2 the same reference numerals have otherwise been employed as in Fig. 1. A detailed description of the embodiment according to Fig. 2 would therefore be a repetition of the foregoing disclosures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Transmitters (AREA)

Abstract

Dans un dispositif conçu pour réduire l'énergie rayonnée par une antenne dans un dispositif de radiocommunications, l'antenne est reliée à un émetteur par l'intermédiaire d'un point d'alimentation (6). Dans la région dudit point d'alimentation (6) de l'antenne, est disposé un corps composé d'un matériau souple, ferromagnétique tel que de la ferrite. Ce corps (7), qui est tubulaire, entoure le conducteur de signaux de l'antenne.
PCT/SE1997/000256 1996-03-04 1997-02-17 Dispositif d'affaiblissement de la sortie d'une antenne WO1997033340A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9600824-8 1996-03-04
SE9600824A SE9600824L (sv) 1996-03-04 1996-03-04 Anordning för effektreducering

Publications (1)

Publication Number Publication Date
WO1997033340A1 true WO1997033340A1 (fr) 1997-09-12

Family

ID=20401646

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000256 WO1997033340A1 (fr) 1996-03-04 1997-02-17 Dispositif d'affaiblissement de la sortie d'une antenne

Country Status (2)

Country Link
SE (1) SE9600824L (fr)
WO (1) WO1997033340A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063621A1 (fr) * 1998-05-29 1999-12-09 Telefonaktiebolaget Lm Ericsson (Publ) Antenne multi-bande hautement efficace destinee a un dispositif de radiocommunication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0603081A1 (fr) * 1992-12-17 1994-06-22 Alcatel N.V. Radio téléphone portable muni de moyens pour protéger l'utilisateur contre le rayonnement de cet émetteur
WO1994014208A1 (fr) * 1992-12-16 1994-06-23 University Of Bradford Ameliorations concernant les telephones portatifs
WO1994019841A1 (fr) * 1993-02-18 1994-09-01 Wave Technologies Inc. Ecran anti-rayonnement
WO1996005682A2 (fr) * 1994-08-01 1996-02-22 Luxon Norval N Ensemble antenne a blindage contre les rayonnements et etendant la portee

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994014208A1 (fr) * 1992-12-16 1994-06-23 University Of Bradford Ameliorations concernant les telephones portatifs
EP0603081A1 (fr) * 1992-12-17 1994-06-22 Alcatel N.V. Radio téléphone portable muni de moyens pour protéger l'utilisateur contre le rayonnement de cet émetteur
WO1994019841A1 (fr) * 1993-02-18 1994-09-01 Wave Technologies Inc. Ecran anti-rayonnement
WO1996005682A2 (fr) * 1994-08-01 1996-02-22 Luxon Norval N Ensemble antenne a blindage contre les rayonnements et etendant la portee

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063621A1 (fr) * 1998-05-29 1999-12-09 Telefonaktiebolaget Lm Ericsson (Publ) Antenne multi-bande hautement efficace destinee a un dispositif de radiocommunication

Also Published As

Publication number Publication date
SE9600824D0 (sv) 1996-03-04
SE9600824L (sv) 1997-09-05

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