EP0415803A1 - Receiving antenna for a motor vehicle - Google Patents

Receiving antenna for a motor vehicle 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
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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Withdrawn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
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German (de)
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
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Mecaniplast
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Filing date
Publication date
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Publication of EP0415803A1 publication Critical patent/EP0415803A1/en
Withdrawn legal-status Critical Current

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    • 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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Abstract

Receiving antenna for motor vehicle, comprising a connector (2) through which passes a bore (6) in which is housed at one end an antenna rod (1), and, at its other end, a conducting element (19, 20, 21, 22) intended to be connected electrically to the core of a coaxial cable (25), the antenna rod (1) and the first conducting element (19, 20, 21, 22) being connected electrically by electronic components (23) arranged inside the bore (6). …<IMAGE>…

Description

La présente invention concerne une antenne réceptrice pour véhicule automobile, du type de celles qui sont montées sur un socle solidaire de la carros­serie et qui comportent un brin d'antenne monté dans une embase solidaire dudit socle.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.

Plus particulièrement, l'antenne que propose l'invention est du type de celles dont l'embase com­porte une pièce intérieure traversée par un alésage dans lequel s'emboîte à une extrémité le brin d'antenne et à l'autre extrémité, un élément conduc­teur relié au coaxial du récepteur, cette pièce intérieure étant elle-même entourée par le fil d'un bobinage relié électriquement à une de ses extrémités, à l'élément conducteur et à l'autre de ses extrémités, au brin d'antenne, la pièce intérieure et ce bobinage étant entourés par un surcapot solidaire du socle.More particularly, 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.

La présente invention propose, quant à elle, une nouvelle antenne de réception de ce type, destinée en particulier à être associée à un autoradio, pour lui permettre de recevoir des signaux à modulation d'amplitude (Grandes Ondes, Petites Ondes, Ondes Moy­ennes) ou des signaux en modulation de fréquence (FM). Cette nouvelle antenne permet de réduire considérablement la longueur des brins d'antenne utilisés, tout en offrant une qualité de réception des ondes égale à celle des antennes déjà connues, voire même meilleure.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.

La présente invention a donc pour objet une antenne réceptrice pour véhicule automobile montée sur un socle solidaire de la carrosserie dudit véhicule et comportant une embase montée sur ledit socle, ladite embase étant traversée par un alésage débouchant dans le socle et dans lequel est emboîté, à son extrémité opposée audit socle, un brin d'antenne, et, à son autre extrémité, un premier élément conducteur destiné à être relié électriquement à l'âme d'un câble coax­ial, ledit alésage étant pratiqué dans une pièce intérieure en un matériau isolant, ladite pièce intérieure étant associée à un fil bobiné sur sa paroi extérieure et reliée par ses extrémités au brin d'antenne et au premier élément conducteur, ladite pièce intérieure et ledit fil étant entourés par un surcapot en un matériau isolant, ladite antenne étant caractérisée par le fait que le brin d'antenne et le premier élément conducteur sont reliés électriquement par des composants électroniques disposés à l'intérieur de l'alésage.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.

Avantageusement, le fil du bobinage s'étend autour de la pièce intérieure selon des directions sensiblement parallèles à l'axe de l'embase de l'antenne ; la pièce intérieure est munie sur sa sur­face externe de nervures délimitant entre elles des gorges, lesdites nervures et lesdites gorges s'étendant sensiblement selon des directions parallèles à l'axe de l'embase de l'antenne, le fil du bobinage étant disposé dans lesdites gorges, autour desdites nervures ; le fil du bobinage comporte plusieurs brins toronnés entre eux et réalisant un fil de Litz.Advantageously, 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.

De préférence, le fil du bobinage est écrasé à une de ses extrémités entre le premier élément con­ducteur et la paroi intérieure de l'alésage. Le fil du bobinage peut être écrasé, à une de ses extrémités, par un deuxième élément conducteur, contre la paroi intérieure de l'alésage, ce deuxième élément conduc­teur étant directement en contact électrique avec une âme conductrice du brin d'antenne. Un élément conduc­teur peut comporter une tête emboîtée dans un évide­ment du surcapot le bloquant en translation. Le sur­capot peut être un surmoulage de la pièce intérieure et du (ou des) élément(s) conducteur(s) qui le prolonge(nt).Preferably, 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).

De façon avantageuse, encore, les composants électroniques sont des composants céramés, juxtaposés les uns aux autres dans l'alésage ; les composants électroniques sont repoussés les uns sur les autres par l'intermédiaire d'un ressort ; les composants électroniques sont séparés du premier élément conduc­teur par une pastille réalisant une capacité ; un com­posant électronique est électriquement équivalent à une inductance en série avec une capacité montée en parallèle avec une diode, ladite diode étant passante de ladite capacité vers ladite inductance.Advantageously, again, 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.

Pour mieux faire comprendre l'invention, on va en décrire ci-après, à titre purement illustratif et non limitatif, un mode de réalisation représenté sur les dessins annexés.To better understand the invention, we will describe below, purely by way of illustration and not limitation, an embodiment shown in the accompanying drawings.

Sur ces dessins :

  • - la figure 1 est une vue schématique d'une antenne conforme à l'invention montée sur une carros­serie de véhicule ;
  • - la figure 2 est une vue en coupe axiale de la même antenne avec arraché partiel au niveau du brin d'antenne ;
  • - la figure 3 est une vue en coupe, à plus grande échelle, selon la ligne III - III de la figure 2 ;
  • - la figure 4, enfin, est une schématisation électrique du circuit auquel correspond ladite an­tenne.
In these drawings:
  • - Figure 1 is a schematic view of an antenna according to the invention mounted on a vehicle body;
  • - Figure 2 is an axial sectional view of the same antenna with partial cutaway at the antenna strand;
  • - Figure 3 is a sectional view, on a larger scale, along the line III - III of Figure 2;
  • - Figure 4, finally, is an electrical diagram of the circuit to which said antenna corresponds.

On voit sur la figure 1 qu'une antenne con­forme à l'invention comporte essentiellement un brin d'antenne 1 monté sur une embase 2 solidarisée d'un socle 3 lui-même fixé sur la carrosserie V d'un véhicule.We see in Figure 1 that 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.

Plus précisément, on voit sur les figures 2 et 3 que l'embase 2 comprend une pièce intérieure 4 qui est sensiblement un manchon cylindrique allongé et dont la paroi extérieure est munie de nervures longi­tudinales 5 réparties régulièrement sur son contour. Cette pièce intérieure 4 est traversée par un alésage 6 centré sur l'axe du brin d'antenne 1. A chacune des extrémités axiales de la pièce intérieure 4, les ner­vures 5 sont munies de rebords 7 en arc de cercle disposés dans le prolongement des parois externes des­dites nervures 5, ainsi que de pattes 8 disposées sur ladite pièce intérieure 4 dans le prolongement intérieur radial des nervures 5 et qui sont en saillie axiale par rapport au reste de ladite pièce intérieure 4, le rebord 7 et la patte 8 associés à une même ner­vure 5 délimitant entre eux un petit passage 9. Ces nervures 5 sont, en outre, munies, sensiblement vers leur mi-hauteur, d'ailettes 28 en saillie par rapport auxdites nervures 5, ces ailettes 28 ayant sensible­ment des sections droites triangulaires. Cette pièce intérieure 4 est réalisée en un matériau isolant et plus particulièrement en polycarbonate chargé de fibres de verre.More specifically, it can be seen in FIGS. 2 and 3 that 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. At each of the axial ends of the internal part 4, 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. These ribs 5 are, moreover, provided, substantially towards their mid-height, fins 28 projecting from said ribs 5, these fins 28 having substantially triangular cross sections . This inner part 4 is made of an insulating material and more particularly of polycarbonate loaded with glass fibers.

Dans les gorges 10 que délimitent entre elles les nervures 5 est passé un fil de Litz 11 qui parcourt les gorges 10 d'une extrémité axiale à une autre de la pièce intérieure 4, ledit fil 11 étant disposé au niveau desdites extrémités dans les pas­sages 9. Une des extrémités de ce fil 11, référencée par 12a, est disposée à l'intérieur de l'alésage 6 vers l'extrémité de la pièce intérieure 4 qui est la plus proche du brin d'antenne 1, l'autre extrémité de ce fil 11, référencée par 12b étant disposée à l'intérieur de l'alésage 6, vers l'autre extrémité de la pièce intérieure 4. Il est à noter que les diamètres intérieurs des petits cylindres définis, entre elles, par les pattes 8 aux deux extrémités de la pièce 4, sont légèrement supérieurs au diamètre intérieur de l'alésage 6, ce qui facilite la mise en place desdites extrémités 12a et 12b du fil de Litz. Ce fil de Litz 11 est un toron réalisé à partir de 60 brins qui ont chacun un diamètre de 6 centièmes de millimètre et qui sont isolés les uns des autres par un vernis, ce toron étant enveloppé dans une torsade de soie.In the grooves 10 delimited between them 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. It should be noted that 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.

La pièce intérieure 4 et le fil de Litz 11 sont entourés par un surcapot 13 qui a une forme sen­siblement cylindrique et dont l'intérieur réalise un surmoulage étanche de ladite pièce 4 et du fil de Litz 11, ladite pièce intérieure 4 étant bloquée par rap­port audit surcapot 13 grâce aux ailettes 28, ce sur­capot 13 étant par ailleurs solidarisé du socle 3 vers son extrémité la plus proche de celui-ci de façon étanche. Ce surcapot 13 est plus long que la pièce intérieure 4 et comporte sur sa paroi extérieure, sen­siblement à mi-hauteur de celle-ci, des cannelures 27 en arc de cercle, sensiblement perpendiculaires à l'axe de l'embase 2. Ces cannelures 27 facilitent la préhension de l'embase 2, lors de la pose de celle-ci sur la carrosserie V. Ce surcapot 13 est réalisé en un caoutchouc synthétique évitant toute entrée d'humidité, vendu sous la dénomination commerciale "Santoprene".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".

Dans l'alésage 6 est insérée, vers l'extrémité de la pièce intérieure 4 la plus proche du brin d'antenne 1, une tige 14 terminée par une tête 15 à 6 pans prolongée, du côté opposé à la tige 14, par un fourreau 16 dans lequel s'emboîte le brin d'antenne 1. La tige 14, la tête 15 et le fourreau 16 ne forment qu'une même pièce en un matériau électriquement con­ducteur, la tête 15 s'appuyant sur les pattes 8 de la pièce intérieure 4 et étant disposée, dans la partie effilée du surcapot 13 la plus éloignée du socle 3, dans un logement exactement complémentaire, ce qui empêche tout mouvement de la tige 14 et du fourreau 16 par rapport au surcapot 13. Le brin d'antenne 1, qui comporte une ame conductrice 17 disposée dans un tube en fibres de verre, est engagé à force dans le fourreau 16, de façon que ladite âme conductrice 17 soit écrasée sur le fond dudit fourreau 16, fond réalisé par la tête 15. En outre, le brin d'antenne 1 est maintenu dans le fourreau 16 par un sertissage annulaire 18 réalisé sur les parois dudit fourreau 16.In the bore 6 is inserted, towards the end of the inner part 4 closest to the antenna strand 1, 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. In addition, the antenna strand 1 is held in the sheath 16 by an annular crimping 18 made on the walls of said sheath 16.

En variante, le brin d'antenne 1 peut être réalisé en une matière conductrice, par exemple en caoutchouc conducteur, et ne pas comporter d'âme con­ductrice.Alternatively, the antenna strand 1 can be made of a conductive material, for example conductive rubber, and not include a conductive core.

A l'extrémité opposée au brin d'antenne 1 vient s'insérer dans l'alésage 6 une tige 19, sensi­blement identique à la tige 14 terminée par deux têtes à six pans juxtaposées, l'une, référencée par 20, étant totalement emboîtée dans le surcapot 13, l'autre, référencée par 21, étant emboîtée latéralement dans le surcapot 13 et ayant une de ses faces en contact avec le socle 3. La tête 21 est, en outre, prolongée du côté opposé à la tige 19 par une douille 22 filetée traversant la carrosserie V, cette douille 22 étant, par exemple, associée à un écrou disposé de l'autre côté de la carrosserie et main­tenant l'ensemble de l'antenne par rapport à l'ensemble de ladite carrosserie V. Par ailleurs, cette douille 22 est reliée par un dispositif de rac­cord classique (non représenté) à l'âme d'un câble coaxial. La tige 19, les têtes 20 et 21 et la tige 22 sont une même pièce réalisée en un matériau métallique, cette pièce réalisant la solidarisation étanche entre le surcapot 13 et le socle 3 et donc entre l'embase 2 et ledit socle 3.At the end opposite to the antenna strand 1 is inserted into the bore 6 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. Furthermore, 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.

Entre les extrémités libres des tiges 14 et 19, sont disposés dans l'alésage 6, des composants céramés électroniques 23, ces composants 23 étant disposés en série les uns sur les autres entre une pastille 24 en un matériau isolant, par exemple en plastique, et un ressort 25 en un matériau électrique­ment conducteur, ladite pastille 24 étant disposée sur l'extrémité de la tige 19 la plus éloignée de la tête 20, le ressort 25 étant en compression entre l'extrémité de la tige 14 la plus éloignée de la tête 15 et les composants 23 qu'il repousse les uns sur les autres. Ces composants 23 sont électriquement équivalents à des micro-circuits comportant chacun une inductance en série avec une capacité c montée en parallèle avec une diode d, la diode d étant passante dans le sens allant de la capacité vers l'inductance.Between the free ends of the rods 14 and 19, are arranged in the bore 6, components electronic ceramics 23, these components 23 being 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.

On a représenté sur la figure 4 le schéma du circuit électrique auquel l'antenne précédemment décrite est équivalente. Ce circuit comporte en série avec le brin d'antenne 1 une inductance L réalisée par le bobinage du fil de Litz 11 autour de la pièce intérieure 4 ainsi que par les brins dudit toron qui sont à l'origine entre eux d'inductances mutuelles. Cette inductance L est montée en parallèle avec, d'une part, N composants électroniques 23 et d'autre part, une capacité C réalisée par la pastille 24 disposée entre les composants 23 et la tige métallique 19. Ce circuit est lui-même monté en série avec le câble coaxial 25 du connecteur, ledit câble étant entouré par une tresse métallique reliée à la masse.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.

Ainsi disposé, ce circuit sert de circuit de transformation du signal, les N composants élec­troniques 23 permettant, en particulier, de transformer un signal à amplitude modulée en un signal somme qui correspond à l'enveloppe supérieure du sig­nal initial auquel on a ajouté une petite ondulation, l'inductance L réalisée par le fil de Litz 11 servant quant à elle essentiellement en modulation de fréquence.Thus arranged, 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.

Il est à noter qu'avec un tel circuit il est possible d'utiliser un brin d'antenne d'une longueur de 40 cm, alors que les brins d'antenne usuels sont d'une longueur d'environ 80 cm. La qualité de réception est tout-à-fait équivalente à celle qui est obtenue avec des antennes usuelles.It should be noted that with such a circuit it is possible to use an antenna strand with a length of 40 cm, while the usual antenna strands are with a length of about 80 cm. The reception quality is entirely equivalent to that obtained with conventional antennas.

Claims (12)

1 - Antenne réceptrice pour véhicule automo­bile montée sur un socle (3) solidaire de la carros­serie (V) dudit véhicule et comportant une embase (2) montée sur ledit socle (3), ladite embase étant traversée par un alésage (6) débouchant dans le socle (3) et dans lequel est emboîté, à son extrémité opposée audit socle (3), un brin d'antenne (1), et, à son autre extrémité, un premier élément conducteur (19, 20, 21, 22) destiné à être relié électriquement à l'âme d'un câble coaxial (25) ledit alésage (6) étant pratiqué dans une pièce intérieure (4) en un matériau isolant, ladite pièce intérieure (4) étant associée à un fil (11) bobiné sur sa paroi extérieure et reliée par ses extrémités (12a, 12b), au brin d'antenne (1) et au premier élément conducteur (19, 20, 21, 22), ladite pièce intérieure (4) et ledit fil (11) étant emboîtés dans un surcapot (13) en un matériau isolant, ladite antenne étant caractérisée par le fait que le brin d'antenne (1) et le premier élément conducteur (19, 20, 21, 22) sont reliés électriquement par des composants électroniques (23) disposés à l'intérieur de l'alésage (6).1 - Receiving antenna for a motor vehicle mounted on a base (3) integral with the body (V) of said vehicle and comprising a base (2) mounted on said base (3), said base being traversed by a bore (6) opening into the base (3) and in which is fitted, at its end opposite to said base (3), an antenna strand (1), and, at its other end, a first conductive element (19, 20, 21, 22) intended to be electrically connected to the core of a coaxial cable (25) said bore (6) being formed in an interior part (4) made of an insulating material, said interior part (4) being associated with a wire (11) wound on its outer wall and connected by its ends (12 a , 12 b ), to the antenna strand (1) and to the first conductive element (19, 20, 21, 22), said inner part (4) and said wire (11) being fitted into an overcap (13) made of an insulating material, said antenna being characterized in that the strand antenna (1) and the first conductive element (19, 20, 21, 22) are electrically connected by electronic components (23) arranged inside the bore (6). 2 - Antenne selon la revendication 1, caractérisée par le fait que le fil (11) du bobinage s'étend autour de la pièce intérieure (4) selon des directions sensiblement parallèles à l'axe de l'embase (2) de l'antenne.2 - Antenna according to claim 1, characterized in that the wire (11) of the winding extends around the inner part (4) in directions substantially parallel to the axis of the base (2) of the antenna. 3 - Antenne selon l'une des revendications 1 ou 2, caractérisée par le fait que la pièce intérieure (4) est munie sur sa surface externe de nervures (5) délimitant entre elles des gorges (10), lesdites ner­vures (5) et lesdites gorges (10) s'étendant sensible­ment selon des directions parallèles à l'axe de l'embase (2) de l'antenne, le fil (11) du bobinage étant diposé dans lesdites gorges (10), autour desdites nervures (5).3 - Antenna according to one of claims 1 or 2, characterized in that the inner part (4) is provided on its outer surface with ribs (5) delimiting between them grooves (10), said ribs (5) and said grooves (10) extending substantially in directions parallel to the axis of the base (2) of the antenna, the wire (11) of the winding being disposed in said grooves (10), around said ribs (5). 4 - Antenne selon l'une des revendications 1 à 3, caractérisée par le fait que le fil (11) du bobinage comporte plusieurs brins toronnés entre eux et réalisant un fil de Litz.4 - Antenna according to one of claims 1 to 3, characterized in that the wire (11) of the winding has several strands stranded together and making a Litz wire. 5 - Antenne selon l'une des revendications 1 à 4, caractérisée par le fait que le fil (11) du bobinage est écrasé à une de ses extrémités (12b) entre le premier élément conducteur (19, 20, 21, 22) et la paroi intérieure de l'alésage (6).5 - Antenna according to one of claims 1 to 4, characterized in that the wire (11) of the winding is crushed at one of its ends (12 b ) between the first conductive element (19, 20, 21, 22) and the inner wall of the bore (6). 6 - Antenne selon l'une des revendications 1 à 5, caractérisée par le fait que le fil (11) du bobinage est écrasé, à une de ses extrémités, par un deuxième élément conducteur (14, 15, 16), contre la paroi intérieure de l'alésage (6), ce deuxième élément conducteur (14, 15, 16) étant directement en contact électrique avec une âme conductrice (17) du brin d'antenne (1).6 - Antenna according to one of claims 1 to 5, characterized in that the wire (11) of the winding is crushed, at one of its ends, by a second conductive element (14, 15, 16), against the wall interior of the bore (6), this second conductive element (14, 15, 16) being directly in electrical contact with a conductive core (17) of the antenna strand (1). 7 - Antenne selon l'une des revendications 5 ou 6, caractérisée par le fait qu'un élément conduc­teur (14, 15, 16 ; 19, 20, 21, 22) comporte une tête (15, 20) emboîtée dans un évidement du surcapot (13) le bloquant en translation.7 - Antenna according to one of claims 5 or 6, characterized in that a conductive element (14, 15, 16; 19, 20, 21, 22) comprises a head (15, 20) fitted into a recess in the overcap (13) blocking it in translation. 8 - Antenne selon l'une des revendications 5 à 7, caractérisée par le fait que le surcapot (13) est un surmoulage de la pièce intérieure (4) et du (ou des) élément(s) conducteur(s) (14, 15, 16 ; 19, 20, 21, 22) qui le prolonge(nt).8 - Antenna according to one of claims 5 to 7, characterized in that the overcap (13) is an overmolding of the inner part (4) and of the conductive element (s) (14) 15, 16; 19, 20, 21, 22) which extends it (s). 9 - Antenne selon l'une des revendications 1 à 8, caractérisée par le fait que les composants éléctroniques (23) sont des composants céramés, juxtaposés les uns aux autres dans l'alésage (6).9 - Antenna according to one of claims 1 to 8, characterized in that the electronic components (23) are ceramic components, juxtaposed with each other in the bore (6). 10 - Antenne selon la revendication 9, caractérisée par le fait que les composants élec­troniques (23) sont repoussés les uns sur les autres par l'intermédiaire d'un ressort (25).10 - Antenna according to claim 9, characterized in that the electronic components (23) are pushed against each other by means of a spring (25). 11 - Antenne selon l'une des revendications 1 à 10, caractérisée par le fait que les composants électroniques (23) sont séparés du premier élément conducteur (19, 20, 21, 22) par une pastille (24) réalisant une capacité (C).11 - Antenna according to one of claims 1 to 10, characterized in that the electronic components (23) are separated from the first conductive element (19, 20, 21, 22) by a patch (24) providing a capacity (C ). 12 - Antenne selon l'une des revendications 1 à 11, caractérisée par le fait qu'un composant élec­tronique (23) est électriquement équivalent à une inductance (1) en série avec une capacité (c) montée en parallèle avec une diode (d), ladite diode étant passante de ladite capacité (c) vers ladite inductance (1).12 - Antenna according to one of claims 1 to 11, characterized in that an electronic component (23) is electrically equivalent to an inductor (1) in series with a capacitor (c) connected in parallel with a diode (d ), said diode being passed from said capacitor (c) to said inductor (1).
EP90401953A 1989-08-31 1990-07-05 Receiving antenna for a motor vehicle Withdrawn EP0415803A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8911421A FR2651379A1 (en) 1989-08-31 1989-08-31 RECEIVER ANTENNA FOR MOTOR VEHICLE.
FR8911421 1989-08-31

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EP0415803A1 true EP0415803A1 (en) 1991-03-06

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EP90401953A Withdrawn EP0415803A1 (en) 1989-08-31 1990-07-05 Receiving antenna for a motor vehicle

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US (1) US5089827A (en)
EP (1) EP0415803A1 (en)
FR (1) FR2651379A1 (en)

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FR2694137A1 (en) * 1992-07-21 1994-01-28 Pizon Ernest Transmission and reception aerial for radiotelephone in vehicle - includes resistance element wound around insulating support forming part of mounting carrying aerial rod
FR2695257A1 (en) * 1992-12-17 1994-03-04 Pizon Ernest Radio aerial for car - has section connected to whip aerial contg. capacitor space with series self-inductance formed by windings on tube

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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
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FR2694137A1 (en) * 1992-07-21 1994-01-28 Pizon Ernest Transmission and reception aerial for radiotelephone in vehicle - includes resistance element wound around insulating support forming part of mounting carrying aerial rod
FR2695257A1 (en) * 1992-12-17 1994-03-04 Pizon Ernest Radio aerial for car - has section connected to whip aerial contg. capacitor space with series self-inductance formed by windings on tube

Also Published As

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

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