EP1689025A1 - Kompakte Mehrbandantenne - Google Patents

Kompakte Mehrbandantenne Download PDF

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Publication number
EP1689025A1
EP1689025A1 EP06101259A EP06101259A EP1689025A1 EP 1689025 A1 EP1689025 A1 EP 1689025A1 EP 06101259 A EP06101259 A EP 06101259A EP 06101259 A EP06101259 A EP 06101259A EP 1689025 A1 EP1689025 A1 EP 1689025A1
Authority
EP
European Patent Office
Prior art keywords
conductive material
layers
electronic
resonant antenna
printed circuit
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Withdrawn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
EP06101259A
Other languages
English (en)
French (fr)
Inventor
Andrea Tagliapietra
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.)
Calearo Antenne SpA
Original Assignee
Calearo Antenne SpA
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 Calearo Antenne SpA filed Critical Calearo Antenne SpA
Publication of EP1689025A1 publication Critical patent/EP1689025A1/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Withdrawn legal-status Critical Current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
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them

Definitions

  • the invention concerns a compact multiband antenna particularly suitable for use on motor vehicles.
  • All said antennas are combined with electronic circuits for initial processing of the signals received, said processing consisting generally in filtering, impedance adaptation and amplification of the radio signal received.
  • the current state of the art comprises the production of multiband antennas, i.e. antennas able to receive signals on several frequency bands and for different applications, for example mobile telephone service, AM, FM and DAB radio, satellite navigators.
  • multiband antennas i.e. antennas able to receive signals on several frequency bands and for different applications, for example mobile telephone service, AM, FM and DAB radio, satellite navigators.
  • Said circuits operate with radio signals belonging to different frequency bands and, therefore, can obviously produce interference with one another, hence it is important to insulate them in the best possible way.
  • the antennas available on the market incorporate the reception circuits in their supporting base in order, among other things, to make the antennas as least intrusive as possible with respect to the structure of the motor vehicle.
  • the aim of the present invention is to overcome the above-mentioned drawbacks.
  • the aim of the present invention is to produce a multiband antenna for motor vehicles that consists of one single multi-resonant shaft and in which all the necessary reception circuits are integrated in the same printed circuit, but with a reciprocal degree of radio-frequency insulation greater than that offered by the equivalent antennas belonging to the known art and having all the electronic reception circuits arranged on one single printed circuit, or in any case such as to minimise or make imperceptible said reciprocal interferences.
  • the antenna of the invention has a radio-frequency insulation among the electronic reception circuits comparable to the insulation obtained by arranging the electronic circuits separately on different printed circuits, but with reduced overall dimensions.
  • a compact multiband antenna which, according to the first claim, comprises at least one metallic element for the reception of radio-frequency signals relating to a plurality of frequency bands, and a multilayer printed circuit combined with said metallic element, provided with a first end layer, made of conductive material and on which a plurality of electronic components are arranged constituting at least a first electronic circuit, and a second end layer opposite the first, also made of conductive material and on which a plurality of electronic components are arranged constituting at least one second electronic circuit, characterised in that said multilayer printed circuit comprises at least one intermediate layer, made of conductive material and separated from said first and second end layer by one or more layers of insulating material, said intermediate layer constituting an earth reference electrically connected to said electronic circuits and suited to electromagnetically separate said first and second end layers from one another.
  • first end layer and on the second end layer several distinct areas are identified, electrically separated from one another, on each of which all the electronic components of one single electronic reception circuit are arranged.
  • Each of said electronic circuits, and therefore each of said areas, corresponds to a earth layer which functions as an earth reference for said circuit.
  • said layer obtains the favourable effect to electromagnetically separate from one another the electronic circuits present on different end layers.
  • first end layer and the second end layer there are, in addition to one or more earth layers, one or more additional layers for the creation of electrical interconnections by means of tracks of conductive material between distinct points of different layers.
  • the multiband antenna subject of the invention is shown in a particular embodiment in fig. 1, where it is indicated as a whole by 1.
  • the metallic element 2 for the reception of radio-frequency signals relating to a plurality of frequency bands, and a multilayer printed circuit 3 combined with the metallic element 2.
  • the printed circuit 3 is provided with a first end layer 4 , made of conductive material and on which a plurality of electronic components 5 are arranged to create a first electronic circuit.
  • a second end layer 6 On the side opposite the first end layer 4 there is a second end layer 6, also made of conductive material and on which a plurality of electronic components 7 are arranged to create a second electronic circuit.
  • the printed circuit 3 comprises two intermediate layers 8 made of conductive material and separated from each other and from the end layers 4, 6 by one or more layers of insulating material 9, each of said intermediate layers 8 constituting an earth reference for the above-mentioned electronic circuits.
  • the intermediate layers 8 consist of a continuous surface of conductive material which identifies a covering area substantially the same as the area identified by the printed circuit, the earth reference they offer is such that the electronic circuits are less susceptible, with respect to the equivalent antennas belonging to the known art, to the reciprocal radio-frequency interferences.
  • each of them has all its electronic components arranged on a distinct area of one of the two end layers.
  • Each of said areas therefore contains the electronic components of only one of the electronic circuits provided on the printed circuit.
  • the arrangement of the electronic components belonging to each individual circuit on distinct areas increases their radio-frequency insulation as it prevents sensitive components of different circuits from being positioned too near one another.
  • said further embodiments increase the level of insulation between the electronic circuits present on the printed circuit, since it is possible to assign the electronic circuits, that are particularly sensitive to reciprocal radio-frequency interferences, a different intermediate layer as earth reference.
  • the end layers 4, 6 and the intermediate layers 8 are separated from one another by layers of insulating material 9 which, in the preferred embodiment, consist of a resin mechanically reinforced by fibreglass and also constitute support for the end layers 4, 6 and intermediate layers 8.
  • the conductive material of said end layers 4, 6 and of said intermediate layers 8 is copper.
  • the printed circuit 3 shown in cross section in fig. 2 and belonging to the antenna 1 of the invention, is provided with two through paths 10, 11, housing two connection elements 20, 21, which can be seen in fig. 1, for input and output of the radio-frequency signals received.
  • Said paths 10, 11 cross the printed circuit 3 throughout its cross section and constitute a mechanical support for the connection elements 20, 21.
  • a further through path 12 is also provided for connection of the printed circuit 3 to the metallic element 2 for reception of the radio-frequency signals.
  • said metallic element 2 in the preferred embodiment it consists of a multi-resonant shaft 13 provided with an intermediate blocking element 14.
  • the latter insulates, in radio-frequency, the lower part of the metallic element 2, resonating at higher frequency, from the upper part, so as to optimise reception of radio signals belonging to different frequency bands.
  • the printed circuit 103 belonging to the antenna of the invention includes several additional layers 115 arranged between the end layers 104, 106, as can be seen in fig. 3.
  • Said additional layers 115 consist of tracks of conductive material to provide interconnections among different points of different layers.
  • Fig. 4 shows a cutaway view of the printed circuit 3.
  • the compact multiband antenna therefore achieves the goals set.
  • a compact multiband antenna is produced consisting of one single multi-resonant shaft with all the necessary reception circuits incorporated in the same printed circuit, but with a higher level of reciprocal radio-frequency insulation than that offered by the equivalent antennas belonging to the known art and having all the electronic reception circuits arranged on one single printed circuit.

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  • Waveguide Aerials (AREA)
EP06101259A 2005-02-03 2006-02-03 Kompakte Mehrbandantenne Withdrawn EP1689025A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI20050031 ITVI20050031A1 (it) 2005-02-03 2005-02-03 Antenna multibanda compatta

Publications (1)

Publication Number Publication Date
EP1689025A1 true EP1689025A1 (de) 2006-08-09

Family

ID=34956708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06101259A Withdrawn EP1689025A1 (de) 2005-02-03 2006-02-03 Kompakte Mehrbandantenne

Country Status (2)

Country Link
EP (1) EP1689025A1 (de)
IT (1) ITVI20050031A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0432647A2 (de) * 1989-12-11 1991-06-19 Kabushiki Kaisha Toyota Chuo Kenkyusho Mobiles Antennensystem
EP0637093A1 (de) * 1993-07-30 1995-02-01 Nippon Antenna Co., Ltd. Antenne
US5628053A (en) * 1991-12-27 1997-05-06 Hitachi, Ltd. Integrated multilayered microwave circuit and a method of fabricating it
DE10025931A1 (de) * 2000-02-25 2001-08-30 Fuba Automotive Gmbh Antennenmodul
EP1286414A1 (de) * 2001-07-30 2003-02-26 ZENDAR S.p.A. Mehrfunktionelle Dachantenne für Kraftfahrzeuge
EP1291967A1 (de) * 2001-02-26 2003-03-12 Nippon Antena Kabushiki Kaisha Mehrfrequenzantenne
US6597583B1 (en) * 1999-10-19 2003-07-22 Shinko Electric Industries Co., Ltd. Multilayer circuit board having a capacitor and process for manufacturing same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0432647A2 (de) * 1989-12-11 1991-06-19 Kabushiki Kaisha Toyota Chuo Kenkyusho Mobiles Antennensystem
US5628053A (en) * 1991-12-27 1997-05-06 Hitachi, Ltd. Integrated multilayered microwave circuit and a method of fabricating it
EP0637093A1 (de) * 1993-07-30 1995-02-01 Nippon Antenna Co., Ltd. Antenne
US6597583B1 (en) * 1999-10-19 2003-07-22 Shinko Electric Industries Co., Ltd. Multilayer circuit board having a capacitor and process for manufacturing same
DE10025931A1 (de) * 2000-02-25 2001-08-30 Fuba Automotive Gmbh Antennenmodul
EP1291967A1 (de) * 2001-02-26 2003-03-12 Nippon Antena Kabushiki Kaisha Mehrfrequenzantenne
EP1286414A1 (de) * 2001-07-30 2003-02-26 ZENDAR S.p.A. Mehrfunktionelle Dachantenne für Kraftfahrzeuge

Also Published As

Publication number Publication date
ITVI20050031A1 (it) 2006-08-04

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