EP1675214A1 - Mehrband Fahrzeug-Antenne - Google Patents

Mehrband Fahrzeug-Antenne Download PDF

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Publication number
EP1675214A1
EP1675214A1 EP05112566A EP05112566A EP1675214A1 EP 1675214 A1 EP1675214 A1 EP 1675214A1 EP 05112566 A EP05112566 A EP 05112566A EP 05112566 A EP05112566 A EP 05112566A EP 1675214 A1 EP1675214 A1 EP 1675214A1
Authority
EP
European Patent Office
Prior art keywords
antenna
helical element
reception
radio signals
elements
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Withdrawn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
EP05112566A
Other languages
English (en)
French (fr)
Inventor
Andrea Raumer
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 EP1675214A1 publication Critical patent/EP1675214A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • H01Q1/405—Radome integrated radiating elements
    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • 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 concerns a multiband antenna for self-propelled vehicles, particularly suitable for receiving/transmitting radio signals belonging to bands of different frequencies.
  • the DAB frequency bands are band III, centered around 200 MHz, and band L, centered around 1500 MHz.
  • This correspondence generally means that receiver antennas are used, their length being 1 ⁇ 4 of the wave length of the signal to be received.
  • a 36 cm monopole is, therefore, necessary for band III and a 5 cm monopole for band L.
  • the monopole antennas known to background art, for receiving/transmitting radio signals relative to all the applications mentioned above, have the common features of comprising a single rod electrically associated with the receiver circuits of the signals in the various frequency bands.
  • each receiver circuit must contain additional electronic circuits that make up for the non-appropriate length of the receiver antenna as this may have a length that is suitable for just one frequency band.
  • the receiver circuits for AM and FM applications use impedance adapters to simulate the missing part of the antenna, while the circuits for mobile telephone systems have part of the antenna on the printed circuit of the receiver.
  • the antenna rod is often equipped with one or more helical blocking elements that divide the antenna into parts of a required length, each part being as suitable as possible to a specific receiver circuit.
  • the antenna has an overall length of 36 cm and is generally provided with a helical blocking element after the first 5 cm, in order to obtain an antenna for receiving band L radio signals, in the first part, and an antenna for receiving band III signals, along its entire length.
  • a first inconvenience consists of the length of the antenna and thus of the overall dimensions which are considered excessive, especially for the most common means of locomotion, such as motor vehicles, there being an increasing tendency to reduce the length of antennas for these means.
  • the aim of this invention is to overcome all the inconveniences described above.
  • the first aim of the present invention is to provide a multiband antenna with compact dimensions compared to equivalent antennas belonging to the background art.
  • An additional aim of the present invention is to provide an antenna which, although being of small size, has a comparable performance, in receiving signals in all the frequency bands of the applications it must be used for, to the performance of antennas belonging to the background art.
  • Another aim of the invention is to provide a multiband antenna that does not involve any additional carrying out complexity, in the receiver circuit, with respect to the background art.
  • the last aim of the invention is to provide a multiband antenna whose carrying out complexity be lower than the equivalent antennas belonging to the background art.
  • a vehicle multiband antenna which, according to the first claim, is suited to receive radio signals with different wave lengths and comprises a casing housing a plurality of elements for receiving/transmitting these radio signals associated with different frequency bands, each of these receiver/transmitter elements being electrically connected to a circuit of electronic components, said antenna being characterized in that the receiver/transmitter elements comprise one essentially helical element and one or more filiform elements, each positioned at least in part inside the volume determined by said helical element, said filiform elements being each one made up of a track of conductor material applied on a substantially laminar-shaped supporting structure that supports said helical element.
  • the casing of the antenna consists of an upper truncated cone-shaped part and a lower dome-shaped part.
  • the essentially helical element is suitable to receive a band III radio signal and it is foreseen a filiform element suited to receive band L radio signals.
  • the supporting structure provides, along the edges, a plurality of support housings for the helical element.
  • the helical element makes it possible to obtain a very long antenna compacted in a small space, while still maintaining an excellent reception band thanks to the volume it determines in the space.
  • Another advantage is that the compact dimensions of the multiband antenna according to this invention allow it to be fitted on the outside of a motor vehicle without foreseeing, unlike similar antennas known to the background art, a removable part necessary, for example, when the vehicle enters a car wash plant.
  • vehicle multiband antenna according to the invention do not require, on the reception circuits, any additional filter, any impedance adaptation to modify the resonance frequency or any additional antenna part, all the elements being separate from each other and each forming an antenna for a specific reception circuit.
  • a further advantage is that the antenna in question can be integrated in a more complex antenna containing other multimedia services, such as for example mobile phone systems and signals relative to satellite navigators, all these antennas being enclosed by the same cap.
  • the carrying out complexity of the multiband antenna of the invention results lower than the equivalent antennas belonging to the background art, not being necessary to provide any type of anchorage of the helical element to the supporting structure.
  • a particular embodiment of the vehicle multiband antenna of the invention is shown in fig. 1 in which it is indicated in general with 1 and in which it can be seen that it comprises a casing 2 housing the receiver/transmitter elements 10, in particular a helical element 3 and a filiform element 4.
  • the embodiment shown refers to an antenna for receiving DAB radio signals, but it should be pointed out that this embodiment is provided only as an example and should not be intended as binding with respect to other embodiments of the antenna of the invention comprising several receiver/transmitter elements.
  • the casing 2 consists of an upper part 2a with a truncated cone shape and a substantially elliptical cross-section, and a lower part 2b with a dome shape and also a substantially elliptical cross-section.
  • the cross-section of the lower part 2b is larger than the cross-section of the upper part 2a, since the upper part 2a is suited to contain the body of the antenna 1, while the lower part 2b is suited to contain the electronic component circuits 11 associated with the antenna 1.
  • said upper part 2a is slightly inclined towards the rear of the vehicle itself to improve the aerodynamics and the appearance.
  • this consists of a metal element 4a positioned on a supporting structure 5 which is made up of the surface of a printed circuit of which the filiform element 4a is a microstrip of conductor material.
  • Said supporting structure 5 presents on its own edges 5a, 5b, as can be seen in fig. 2, a plurality of support housings 6 placed at an equal distance one each other and suitable to receive the outer helical element 3.
  • these support housings 6 makes it possible, during construction of the antenna 1 of the invention, to ensure the correct distance between the turns of the helical element 3.
  • the presence of said support housings 6 allow the supporting structure 5 to support the helical element 3 without the presence of any anchorage means such as welding or other.
  • the volume determined by the helical element 3 constitutes the maximum overall dimensions of the antenna 1, except for the lower part which is, however, substantially flat.
  • the filiform element 4 is supported by the surface 5 of the printed circuit and is completely inserted in the helical element 3.
  • the outer helical element is suited to receive band III signals, while the inner filiform element is suited to receive band L signals.
  • the support housings are notches or shoulders, in any case always made on the edge of the printed circuit.
  • the support housings are not present.
  • the initial part of every antenna is electrically connected to a circuit of electronic components 11 suited to receive radio signals belonging to a specific frequency band.
  • Another executive embodiment of the antenna of the invention presents a helical element 103 and a first filiform element 104 for the reception of DAB radio signals, and a second filiform element 108 for the reception/transmission of other services such as, for example, the television signal.
  • the outer helical element 103 represents the maximum overall dimensions for the plurality of reception/transmission elements 110 present, with the advantage of considerably reducing the spaces taken up by these reception/transmission elements 110 which, otherwise, would either have to be arranged on a single long element, which would require blocking elements and additional adaptation circuits, or positioned separately from each other and in various points in the vehicle thus also creating an effect in terms of appearance that is not always acceptable.
  • each reception/transmission element 10 of the antenna 1 receives radio signals with a predetermined wave length.
  • the antenna 1 When the antenna 1 receives the radio signal, it transforms it into an electric signal that runs along the body of the antenna 1 and, by means of an electrical connection with a relative reception circuit 11 to which the antenna 1 is associated, passes the signal to the reception circuit 11.
  • the latter then sends the resulting signal to an amplification circuit, not shown here, which processes the information contained in the signal itself.
  • a filiform element of the antenna acts as a "feed" for the outer helical element.
  • the vehicle multiband antenna 1 of the invention achieves all the predetermined aims.
  • the vehicle multiband antenna of the invention achieves the aim of containing several reception/transmission elements, each suited to receive radio signals with different wave lengths and thus for different applications, in a compact casing.
  • the vehicle multi band antenna of the invention also achieves the aim of not causing further complexity with respect to the background art, in the various radio signal reception circuits.
  • the vehicle multiband antenna of the invention achieves the aim of not requiring, in any part of it, the addition of mechanical elements to make it, when necessary, removable from the body of the vehicle on which it is fitted.
  • the multiband antenna of the invention achieves the aim to provide a carrying out complexity lower than the equivalent antennas belonging to the background art, since the helical element rests on the supporting structure and it does not require any anchorage to said supporting structure.

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
EP05112566A 2004-12-23 2005-12-21 Mehrband Fahrzeug-Antenne Withdrawn EP1675214A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000306A ITVI20040306A1 (it) 2004-12-23 2004-12-23 Antenna multibanda veicolare

Publications (1)

Publication Number Publication Date
EP1675214A1 true EP1675214A1 (de) 2006-06-28

Family

ID=34956567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05112566A Withdrawn EP1675214A1 (de) 2004-12-23 2005-12-21 Mehrband Fahrzeug-Antenne

Country Status (2)

Country Link
EP (1) EP1675214A1 (de)
IT (1) ITVI20040306A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009038038A1 (de) * 2009-08-19 2011-02-24 Bayerische Motoren Werke Aktiengesellschaft Antennenanordnung für ein Kraftfahrzeug und Kraftfahrzeug
EP2437347A1 (de) * 2010-10-04 2012-04-04 Mitsumi Electric Co., Ltd. Antennenvorrichtung
EP3086406A1 (de) * 2015-04-23 2016-10-26 Mitsumi Electric Co., Ltd. Antennenvorrichtung
CN110247199A (zh) * 2019-07-10 2019-09-17 常州柯特瓦电子有限公司 天线装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790666A1 (de) 1996-02-16 1997-08-20 Lk-Products Oy Kombinierte Struktur einer Helixantenne und einer dielektrischen Platte
US6181296B1 (en) 1998-10-29 2001-01-30 Harris Corporation Cast core fabrication of helically wound antenna
WO2001033666A1 (en) * 1999-10-29 2001-05-10 Mobile Satellite Ventures Llp Dual-mode satellite and terrestrial antenna
US6246379B1 (en) 1999-07-19 2001-06-12 The United States Of America As Represented By The Secretary Of The Navy Helix antenna
WO2004036686A1 (en) 2002-10-15 2004-04-29 Calearo Antenne S.R.L Vehicular antenna with improved screening

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0790666A1 (de) 1996-02-16 1997-08-20 Lk-Products Oy Kombinierte Struktur einer Helixantenne und einer dielektrischen Platte
US6181296B1 (en) 1998-10-29 2001-01-30 Harris Corporation Cast core fabrication of helically wound antenna
US6246379B1 (en) 1999-07-19 2001-06-12 The United States Of America As Represented By The Secretary Of The Navy Helix antenna
WO2001033666A1 (en) * 1999-10-29 2001-05-10 Mobile Satellite Ventures Llp Dual-mode satellite and terrestrial antenna
WO2004036686A1 (en) 2002-10-15 2004-04-29 Calearo Antenne S.R.L Vehicular antenna with improved screening

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009038038A1 (de) * 2009-08-19 2011-02-24 Bayerische Motoren Werke Aktiengesellschaft Antennenanordnung für ein Kraftfahrzeug und Kraftfahrzeug
DE102009038038B4 (de) 2009-08-19 2022-08-11 Bayerische Motoren Werke Aktiengesellschaft Antennenanordnung für ein Kraftfahrzeug und Kraftfahrzeug
EP2437347A1 (de) * 2010-10-04 2012-04-04 Mitsumi Electric Co., Ltd. Antennenvorrichtung
EP3086406A1 (de) * 2015-04-23 2016-10-26 Mitsumi Electric Co., Ltd. Antennenvorrichtung
CN110247199A (zh) * 2019-07-10 2019-09-17 常州柯特瓦电子有限公司 天线装置
CN110247199B (zh) * 2019-07-10 2021-06-25 常州柯特瓦电子股份有限公司 天线装置

Also Published As

Publication number Publication date
ITVI20040306A1 (it) 2005-03-23

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