EP0415803A1 - Antenne réceptrice pour véhicule automobile - Google Patents

Antenne réceptrice pour véhicule automobile Download PDF

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Publication number
EP0415803A1
EP0415803A1 EP90401953A EP90401953A EP0415803A1 EP 0415803 A1 EP0415803 A1 EP 0415803A1 EP 90401953 A EP90401953 A EP 90401953A EP 90401953 A EP90401953 A EP 90401953A EP 0415803 A1 EP0415803 A1 EP 0415803A1
Authority
EP
European Patent Office
Prior art keywords
antenna
base
conductive element
wire
antenna according
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Withdrawn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
EP90401953A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ernest Pizon
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.)
Mecaniplast
Original Assignee
Mecaniplast
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 Mecaniplast filed Critical Mecaniplast
Publication of EP0415803A1 publication Critical patent/EP0415803A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01Q9/32—Vertical arrangement of element
    • 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
    • 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 present invention relates to a receiving antenna for a motor vehicle, of the type which are mounted on a base secured to the body and which comprise an antenna strand mounted in a base secured to said base.
  • the antenna which the invention proposes is of the type of which the base comprises an interior part traversed by a bore in which fits at one end the antenna strand and at the other end, an element conductor connected to the coaxial of the receiver, this interior part itself being surrounded by the wire of a winding electrically connected at one of its ends, to the conductive element and at the other of its ends, to the antenna strand, the inner part and this winding being surrounded by an overcap secured to the base.
  • the present invention proposes, for its part, a new reception antenna of this type, intended in particular to be associated with a car radio, to enable it to receive signals with amplitude modulation (Large Waves, Small Waves, Medium Waves) or frequency modulation (FM) signals.
  • This new antenna makes it possible to considerably reduce the length of the antenna strands used, while providing a quality of reception of the waves equal to that of the antennas already known, or even better.
  • the present invention therefore relates to a receiving antenna for a motor vehicle mounted on a base secured to the body of said vehicle and comprising a base mounted on said base, said base being traversed by a bore opening in the base and in which is fitted, its end opposite to said base, an antenna strand, and, at its other end, a first conductive element intended to be electrically connected to the core of a coaxial cable, said bore being formed in an inner part made of an insulating material, said inner part being associated with a wire wound on its outer wall and connected by its ends to the antenna strand and to the first conductive element, said inner part and said wire being surrounded by an overcap of an insulating material, said antenna being characterized in that the antenna strand and the first conductive element are electrically connected by electronic components arranged at the inside the bore.
  • the winding wire extends around the interior part in directions substantially parallel to the axis of the base of the antenna; the inner part is provided on its outer surface with ribs defining grooves therebetween, said ribs and said grooves extending substantially in directions parallel to the axis of the antenna base, the winding wire being disposed in said grooves, around said ribs; the winding wire has several strands stranded together and making a Litz wire.
  • the winding wire is crushed at one of its ends between the first conductive element and the interior wall of the bore.
  • the winding wire can be crushed, at one of its ends, by a second conductive element, against the internal wall of the bore, this second conductive element being directly in electrical contact with a conductive core of the antenna strand.
  • a conductive element may include a head fitted into a recess in the overcap blocking it in translation.
  • the overcap can be an overmolding of the interior part and of the conductive element (s) which make it extend (s).
  • the electronic components are ceramic components, juxtaposed with each other in the bore; the electronic components are pushed against each other by means of a spring; the electronic components are separated from the first conductive element by a patch carrying out a capacity; an electronic component is electrically equivalent to an inductor in series with a capacitor connected in parallel with a diode, said diode being passed from said capacitor to said inductor.
  • an antenna according to the invention essentially comprises an antenna strand 1 mounted on a base 2 secured to a base 3 itself fixed to the body V of a vehicle.
  • the base 2 comprises an interior part 4 which is substantially an elongated cylindrical sleeve and the outer wall of which is provided with longitudinal ribs 5 distributed regularly over its contour.
  • This internal part 4 is crossed by a bore 6 centered on the axis of the antenna strand 1.
  • the ribs 5 are provided with edges 7 in an arc arranged in the extension of the external walls of said ribs 5, as well as of legs 8 arranged on said inner part 4 in the radial internal extension of the ribs 5 and which are projecting axially relative to the rest of said inner part 4, the flange 7 and the tab 8 associated with the same rib 5 delimiting between them a small passage 9.
  • This inner part 4 is made of an insulating material and more particularly of polycarbonate loaded with glass fibers.
  • the ribs 5 is passed a Litz wire 11 which runs through the grooves 10 from one axial end to another of the inner part 4, said wire 11 being disposed at said ends in the passages 9
  • One end of this wire 11, referenced by 12 a is disposed inside the bore 6 towards the end of the interior part 4 which is closest to the antenna strand 1, the other end of this wire 11, referenced by 12 b being disposed inside the bore 6, towards the other end of the internal part 4.
  • the internal diameters of the small cylinders defined, between them, by the legs 8 at the two ends of the part 4 are slightly greater than the diameter inside the bore 6, which facilitates the positioning of said ends 12 a and 12 b of the Litz wire.
  • This Litz 11 wire is a strand made from 60 strands which each have a diameter of 6 hundredths of a millimeter and which are isolated from each other by a varnish, this strand being wrapped in a twist of silk.
  • the inner part 4 and the Litz wire 11 are surrounded by an overcap 13 which has a substantially cylindrical shape and the interior of which provides a sealed overmolding of said part 4 and of the Litz wire 11, said inner part 4 being blocked relative to said overcap 13 thanks to the fins 28, this overcap 13 being moreover secured to the base 3 towards its end closest to the latter in a sealed manner.
  • This overcap 13 is longer than the inner part 4 and has on its outer wall, approximately halfway up the latter, grooves 27 in an arc of a circle, substantially perpendicular to the axis of the base 2. These grooves 27 facilitate gripping of the base 2, when it is placed on the body V.
  • This overcap 13 is made of synthetic rubber preventing any entry of moisture, sold under the trade name "Santoprene".
  • a rod 14 terminated by an extended head 15 with hexagon, on the side opposite to the rod 14, by a sheath 16 into which the antenna strand fits 1.
  • the rod 14, the head 15 and the sheath 16 form a single piece of an electrically conductive material, the head 15 resting on the legs 8 of the inner part 4 and being arranged, in the tapered part of the overcap 13 furthest from the base 3, in an exactly complementary housing, which prevents any movement of the rod 14 and of the sheath 16 with respect to the overcap 13.
  • the antenna strand 1 which comprises a conductive core 17 disposed in a glass fiber tube, is forcibly engaged in the sheath 16, so that said conductive core 17 is crushed on the bottom of said sheath 16, bottom made by the head 15.
  • the antenna strand 1 is held in the sheath 16 by an annular crimping 18 made on the walls of said sheath 16.
  • the antenna strand 1 can be made of a conductive material, for example conductive rubber, and not include a conductive core.
  • a rod 19 substantially identical to the rod 14 terminated by two juxtaposed hexagon heads, one, referenced by 20, being fully fitted in the overcap 13, the other, referenced by 21, being fitted laterally in the overcap 13 and having one of its faces in contact with the base 3.
  • the head 21 is, moreover, extended on the side opposite to the rod 19 by a threaded bush 22 passing through the body V, this bush 22 being, for example, associated with a nut placed on the other side of the body and maintaining the whole of the antenna with respect to the whole of said body V.
  • this socket 22 is connected by a conventional connection device (not shown) to the core of a coaxial cable.
  • the rod 19, the heads 20 and 21 and the rod 22 are one and the same part made of a metallic material, this part making the watertight connection between the overcap 13 and the base 3 and therefore between the base 2 and said base 3.
  • components electronic ceramics 23 are arranged in series one on the other between a pad 24 made of an insulating material, for example plastic, and a spring 25 made of an electrically conductive material, said pad 24 being arranged on the end of the rod 19 furthest from the head 20, the spring 25 being in compression between the end of the rod 14 furthest from the head 15 and the components 23 which it pushes against each other.
  • These components 23 are electrically equivalent to micro-circuits each comprising an inductor in series with a capacitance c connected in parallel with a diode d, the diode d being pass-through in the direction going from the capacitance to the inductor.
  • FIG. 4 shows the diagram of the electrical circuit to which the antenna previously described is equivalent.
  • This circuit comprises in series with the antenna strand 1 an inductance L produced by the winding of the Litz wire 11 around the internal part 4 as well as by the strands of said strand which are at the origin between them of mutual inductances.
  • This inductance L is mounted in parallel with, on the one hand, N electronic components 23 and, on the other hand, a capacitor C produced by the pad 24 disposed between the components 23 and the metal rod 19.
  • This circuit is itself mounted in series with the coaxial cable 25 of the connector, said cable being surrounded by a metal braid connected to ground.
  • this circuit serves as a signal transformation circuit, the N electronic components 23 making it possible, in particular, to transform an amplitude-modulated signal into a sum signal which corresponds to the upper envelope of the initial signal to which a small one has been added. ripple, the inductance L produced by the Litz wire 11 serving for its part essentially in modulation of frequency.

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  • Details Of Aerials (AREA)
EP90401953A 1989-08-31 1990-07-05 Antenne réceptrice pour véhicule automobile Withdrawn EP0415803A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8911421 1989-08-31
FR8911421A FR2651379A1 (fr) 1989-08-31 1989-08-31 Antenne receptrice pour vehicule automobile.

Publications (1)

Publication Number Publication Date
EP0415803A1 true EP0415803A1 (fr) 1991-03-06

Family

ID=9385023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401953A Withdrawn EP0415803A1 (fr) 1989-08-31 1990-07-05 Antenne réceptrice pour véhicule automobile

Country Status (3)

Country Link
US (1) US5089827A (enrdf_load_stackoverflow)
EP (1) EP0415803A1 (enrdf_load_stackoverflow)
FR (1) FR2651379A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694137A1 (fr) * 1992-07-21 1994-01-28 Pizon Ernest Antenne.
FR2695257A1 (fr) * 1992-12-17 1994-03-04 Pizon Ernest Antenne.

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6025808A (en) * 1993-10-04 2000-02-15 The United States Of America As Represented By The Secretary Of The Navy Passive surface deployed variable inductance wire antenna
US5652599A (en) * 1995-09-11 1997-07-29 Qualcomm Incorporated Dual-band antenna system
US5982332A (en) * 1998-10-19 1999-11-09 Shakespeare Company Broad band transmit and receive antenna
US6429821B1 (en) * 1999-10-12 2002-08-06 Shakespeare Company Low profile, broad band monopole antenna with inductive/resistive networks
GB0222475D0 (en) * 2002-09-27 2002-11-06 British Nuclear Fuels Plc Process for the dissolution of actinic oxides

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931034A (en) * 1958-07-07 1960-03-29 Avco Mfg Corp Variable inductance for loading antenna
US4161710A (en) * 1978-01-06 1979-07-17 Tadao Kakurai Loading coil for antenna
US4167011A (en) * 1976-12-22 1979-09-04 Hustler, Inc. Radio antenna construction
US4170014A (en) * 1978-02-01 1979-10-02 Antenna and Vehicular Accessories, Inc. Antenna coil
GB2035699A (en) * 1978-09-27 1980-06-18 Wells D Base-loaded whip antenna
US4439772A (en) * 1981-05-18 1984-03-27 Kol Gerald W Van Inductor type half wave antenna
GB2148604A (en) * 1983-10-18 1985-05-30 Plessey Co Plc Monopole aerial

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053308A (enrdf_load_stackoverflow) * 1963-06-29 1900-01-01
US4890116A (en) * 1986-04-09 1989-12-26 Shakespeare Company Low profile, broad band monopole antenna
JPS63169703U (enrdf_load_stackoverflow) * 1987-04-21 1988-11-04

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931034A (en) * 1958-07-07 1960-03-29 Avco Mfg Corp Variable inductance for loading antenna
US4167011A (en) * 1976-12-22 1979-09-04 Hustler, Inc. Radio antenna construction
US4161710A (en) * 1978-01-06 1979-07-17 Tadao Kakurai Loading coil for antenna
US4170014A (en) * 1978-02-01 1979-10-02 Antenna and Vehicular Accessories, Inc. Antenna coil
GB2035699A (en) * 1978-09-27 1980-06-18 Wells D Base-loaded whip antenna
US4439772A (en) * 1981-05-18 1984-03-27 Kol Gerald W Van Inductor type half wave antenna
GB2148604A (en) * 1983-10-18 1985-05-30 Plessey Co Plc Monopole aerial

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694137A1 (fr) * 1992-07-21 1994-01-28 Pizon Ernest Antenne.
FR2695257A1 (fr) * 1992-12-17 1994-03-04 Pizon Ernest Antenne.

Also Published As

Publication number Publication date
FR2651379B1 (enrdf_load_stackoverflow) 1994-12-16
FR2651379A1 (fr) 1991-03-01
US5089827A (en) 1992-02-18

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