EP0720250A1 - Kraftfahrzeugantenne und Anpassungsvorrichtung mit aktiver Impedanz für eine solche Antenne - Google Patents

Kraftfahrzeugantenne und Anpassungsvorrichtung mit aktiver Impedanz für eine solche Antenne Download PDF

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Publication number
EP0720250A1
EP0720250A1 EP95402681A EP95402681A EP0720250A1 EP 0720250 A1 EP0720250 A1 EP 0720250A1 EP 95402681 A EP95402681 A EP 95402681A EP 95402681 A EP95402681 A EP 95402681A EP 0720250 A1 EP0720250 A1 EP 0720250A1
Authority
EP
European Patent Office
Prior art keywords
annular
antenna
antenna according
base
piece
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.)
Granted
Application number
EP95402681A
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English (en)
French (fr)
Other versions
EP0720250B1 (de
Inventor
Raymond Caillot
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.)
Compagnie Europeenne de Composants Electroniques LCC CICE
Original Assignee
Mecaniplast
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Filing date
Publication date
Application filed by Mecaniplast filed Critical Mecaniplast
Publication of EP0720250A1 publication Critical patent/EP0720250A1/de
Application granted granted Critical
Publication of EP0720250B1 publication Critical patent/EP0720250B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
    • H01Q1/1214—Supports; Mounting means for fastening a rigid aerial element through a wall

Definitions

  • the present invention relates to an antenna for a motor vehicle capable of receiving an active impedance adapter as well as an active impedance adapter assembly for such an antenna.
  • the strand of an antenna must have a certain length adapted to this reception; when it is desirable, for implantation reasons, to limit the length of the antenna strand, use is made of an active antenna impedance adapter, that is to say a powered impedance adapter in electrical power, the role of which is to reinforce the signal received by the antenna to compensate for this reduction in length; in fact, an antenna that is too long is not without problems: difficulties in maneuvering in individual garages with generally low ceilings, difficulties during automatic vehicle washing operations, whistling at high speed, or others.
  • the antenna strand is generally supported by a base; so far, the active antenna impedance adapter is in an independent box placed in the vicinity of the radio receiver or the base, or inside the base itself; such an arrangement, which requires a particular assembly, is bulky and inconvenient when the antenna is intended to equip a motor vehicle.
  • the active impedance adapter When the active impedance adapter is inside the base, it is necessary that it has a height suitable for receiving it; such a height then leads to a base that is too high when it is not decided to add an active impedance adapter to the antenna; in addition, the base being placed outside the passenger compartment of the vehicle, the active impedance adapter is subjected to thermal stresses which are harmful to it.
  • the present invention aims to avoid the above drawbacks and relates to an antenna capable of receiving, or not, an active adapter of space-saving impedance, associated with the conventional antenna base.
  • the element integral with the male element is an insulating ring carried by the base, and the centering surface of the insulating annular part is a cylindrical recess formed in the annular insulating part.
  • the centering surface of the insulating annular part is an annular spacer which is pressed against the inner face of the annular core part and which cooperates with the male element.
  • the annular spacer is molded with the insulating annular part; the annular spacer has an axial annular extension on which the annular core piece is centered.
  • the annular mass element consists of an annular mass-taking part and an annular mass part.
  • the male element of the connecting member is a threaded rod secured to the base, and the female element is a nut carrying the contact means and screwed onto the rod.
  • the male element of the connecting member is the threaded rod of a head screw and the female element is a tapping that comprises the base, the contact means being constituted by the head of the screw.
  • the contact means rests directly on the annular core part.
  • an active antenna impedance adapter consisting of a plate in the form of a flat washer, one of the faces of the plate carrying an annular conductive track of output coming into abutment against the annular core part and the other face carrying an annular conductive entry track on which abuts the contact means, the face of the plate which carries the entry track also carrying the means electrical adapters of an adapter circuit supplied electrically by a power supply terminal carried by said wafer, the output track being connected to the output terminal of the adapter circuit by means of a metallized through hole the wafer, a ground terminal of said adapter circuit being electrically connected to the annular ground element of the nozzle.
  • the active adapter is placed in a housing consisting of a cylindrical skirt held by clipping by the annular mass element of the end piece; the earth terminal of the active adapter is connected to earth by a pin secured to the housing.
  • the housing is closed by a cover.
  • the base carries clipping pins for clipping the base on the edges of an opening of the bodywork element.
  • the insulating annular piece carries at least one column; the column is adapted to be received in a chimney provided in the base, the chimney having ribs or beads to increase the effect of holding the clipping pins on the bodywork element.
  • the present invention also relates to an assembly consisting of an active adapter, a housing, a protector and a cover, these constituents being as used in the antenna having the characteristics mentioned above.
  • an antenna base 30 for a motor vehicle such a known base is generally made up of a part hollow molded plastic material defined by a wall of generally frustoconical shape developed from a base in the general shape of an ellipse surrounded at its lower part by a sealing lip bearing on a bodywork element 40; at the upper part of the base 30, a metal pin, for example made of brass, not shown, internally threaded, is intended to receive the externally threaded end of an antenna strand; this metal pin is in electrical contact with a metal support covered by the plastic material of the base 30 and comprising a male element in the form of a threaded rod 31 intended to receive a female element in the form of a tightening nut 32; at its exit from the base 30, the threaded rod 31 is surrounded by plastic material constituting an insulating ring 42; when the base 30 is placed on the body element 40, the insulating ring 42 passes through an opening 41 of the body element 40; a metal pin, for example made of brass, not shown, internally
  • the end piece 20 is produced by the assembly of annular parts: an annular mass-taking part 21 having raised teeth 43, an annular mass part 22, an insulating annular part 23, an annular core part 24; the annular parts for mass taking 21, mass 22 and core 24 are metallic, made of thin cut and folded sheet metal; the insulating annular piece 23 is made of plastic; the end piece 20 is assembled by crimping tabs, which have the metallic annular parts, in corresponding housings of the annular insulating plastic part 23: such housings are visible in FIG. 5 under the references 61, 62 although this FIG. 5, like FIG.
  • the insulating part 23 also has notches 63 and 64, also visible in FIGS. 4 and 5; the notches 63, three in number arranged circumferentially at 120 degrees from each other, each receive an axial elastic tab of the annular mass piece 22, tab carrying a transverse boss 35 whose role will appear below; the notch 64 makes it possible to receive the end of the coaxial cable 27, more particularly the stripped end of the core 26 of said cable 27, and a tab 39 of the annular core part 24 to which is fixed, by welding, said end of the core 26.
  • the annular insulating part 23 moreover has at its center a cylindrical recess 44, of a diameter barely greater than that of the insulator 42 of the base 30.
  • the annular part for taking mass 21 is extended along a tail 34 crimped around a stripped part of the mass braid 25 of the cable 27 as well as around the cable itself.
  • Such a tip 20 is known and of the kind described, for example, in FR-A-2,563,946.
  • the assembly of the assembly is carried out as follows.
  • the base 30 being on the bodywork element 40 in the position shown in FIG. 1, the end piece 20 of the cable 27 is threaded on the threaded rod 31 and on the insulator 42, then a nut 32 is screwed onto the threaded rod 31.
  • the teeth 43, of the annular grounding piece 21 scratch the underside of the bodywork element 40 which, as is known, is the electrical mass of the vehicle ; therefore, the ground braid 25 of the cable 27 is connected to said ground; in parallel, the antenna signal is transmitted by the threaded rod 31 to the nut 32, thanks to the tightening cooperation of their respective threads, which nut 32 transmits said antenna signal to the core 26 of the cable 27 thanks to the cooperation of the transverse face 33 of the nut 32 and of the annular core part 24, bearing one on the other.
  • such a tip 20 is arranged so as to allow the addition, if desired, of an active impedance adapter; in the case of an adaptation of the antenna signal, it is essential that the annular core part 24 of the end piece 20 does not touch the threaded rod 31, in which case the adaptation circuit would be short-circuited; to prevent manufacturing tolerances from leading to centering of the end piece 20, by cooperation of the insulator 42 of the base 30 with the cylindrical recess 44 of the annular insulating part 23, insufficient from this point of view, the central hole 29 of the annular core part 24 is provided large enough for this contact to be avoided for sure.
  • the insulating annular part 23 of the end piece 20 has a centering surface defined by the recess 44 cooperating with a part integral with the male element or threaded rod 31, with the connecting member: the orifice made in the annular core part 24, for the passage of said male element 31, has, in the plane of the annular core part 24, a contour circumscribed with respect to that of the male element which is undoubtedly isolated of the annular core part 24; thanks to this arrangement, it is possible, if desired, without any modification of the base or of the end piece, to allow, or not, the addition of an active impedance adapter; the addition of such an adapter will be described below with reference to FIG. 2.
  • the assembly of the antenna according to FIG. 1 ends with the fitting of a metal cover 36 which has a notch 38 for the passage of the cable 27 and the maintenance of which is ensured by three blocking passages 37 which it presents and in which the three bosses 35 of the legs of the annular mass piece 22 of the end piece 20 are placed elastically; thus, the metal cover 36 is connected to ground and plays the role of shielding.
  • an active adapter consisting of a plate 10, in the form of a flat washer, of double-sided printed circuit; one of the faces, the face 11 in the figure, carries an annular conductive track 12, called the exit track, and the other face, the face 13, carries an annular conductive track 14, called the entry track; the actual reinforcement of a signal is achieved by electrical and electronic components connected by a circuit adaptation carried out according to printed traces arranged on the input face 13 around the input track 14 which constitutes the input terminal of this circuit; some of said components have been illustrated in the figure under the reference 15; such a circuit requiring for its operation an electrical supply, the supply terminal 16 of this circuit is connected by welding to a supply conductor 76; the output terminal of said supply circuit, located on the input face 13 of the wafer 10, is electrically connected to the output track 12, located on the opposite face 11, by means of a metallized hole 17 which crosses the plate 10.
  • the plate 10 is intended to be threaded onto the threaded rod 31 of the base 30; therefore, the insulating part of the double-sided printed circuit has a suitable central opening 19 having a diameter slightly greater than that of the threaded rod 31; for reasons which will appear more clearly below, the exit track 12 of annular shape has its small diameter which is larger than that of the central opening 19, while the small diameter of the entry track 14, also annular in shape, is at most equal to the diameter of said central opening 19.
  • a metal box 50 is associated with the plate 10;
  • the housing 50 consists of a cylindrical skirt 51 whose internal diameter is slightly greater than the external diameter of the plate 10 so as to receive said plate 10 while it extends transversely relative to the longitudinal axis of the housing 50 ;
  • the skirt 51 is extended at its upper part, with respect to FIG. 2, along a transverse shoulder 56 to which a cylindrical collar 59 is connected, having the same axis as that of the skirt 51 and extending, relative to the shoulder 56 , on the side opposite that from which extends the skirt 51;
  • the housing 50 is adapted to be mounted on the end piece 20 in the manner of the cover 36 described with reference to FIG. 1; for this purpose, the flange 59 has a diameter suitable for this purpose and has three blocking passages 57 and a notch 58, similar to the passages 37 and the notch 38 of the cover 36.
  • the adaptation circuit needing to receive the mass for its operation, and the housing 10 being grounded, the shoulder 56 of the housing 10 is used to bring the mass to the right of the adaptation circuit: the shoulder 56 carries a pin 52 directed towards the inside of the skirt 51 and adapted to pass through a notch 18 of the plate 10; when the latter is mounted in the skirt 51 until it touches the inner face of the shoulder 56, the end of the pin 52 is welded to the earth terminal of the adaptation circuit on the face 13 of the input of the plate 10.
  • the housing 50 is adapted to receive a plastic protector 70 inside the skirt 51;
  • the protector 70 comprises an annular dome 73 whose concavity is directed towards the inside of the skirt 51 and which is surmounted in its center by a cylindrical chimney 74; at the outer periphery of the dome 73, at least one annular tooth 71 is adapted to come to cooperate with at least one transverse surface 67 formed on the inner face of the skirt 51, for holding the protector 70 in the skirt 51;
  • the protector 70 includes a grommet 72 for the passage of the supply wire 76; when the plate 10 and the protector 70 are in place in the housing 50, the end of the chimney 74 participates in the maintenance of the plate 10, and the dome 73 defines a space for the components 15 of the adaptation circuit which it protected.
  • the lower end of the skirt 51 is closed by a metal cover 53 which has a circular boss 54 adapted to be clipped into an annular groove 55 that the skirt 51 has on its outer surface; a hole 68 in the cover 53 allows the passage of the supply wire 76.
  • the housing 50, the wafer 10 and the protector 70 constitute, once assembled, an active adapter subassembly that is easy to handle.
  • the assembled assembly is shown in FIG. 3.
  • FIG. 3 an alternative embodiment of the centering surface of the annular insulating part 23 has been shown, which makes it possible to provide an isolation space between the annular core part 24 and the male element or threaded rod 31; according to this variant, in the annular insulating part 23 of the end piece 20 is introduced a centering spacer, made of insulating material, pressed against the inner face of the annular core part 24, as shown at 28 in FIG. 2.
  • this same object is achieved by bringing such a spacer in one piece with the rest of the annular insulating part; it then suffices, for the production of the end piece, to replace the insulating annular part 23 with an insulating annular part 123, shown in FIGS. 4 and 5, all other things being equal; the part 123 comprises a spacer 69 molded with the rest of the part and whose central passage 66 has a diameter less than that of the central hole 29 of the annular core part 24.
  • Figures 6 and 7 relate to another type of antenna base that can receive, if desired, also an active impedance adapter.
  • the base 130 of Figure 6 is more particularly suitable for a vehicle roof antenna placed at the rear thereof.
  • the base 130 consists of a hollow piece 134 molded in plastic material defined by a wall of generally frustoconical shape having at its lower part a sealing lip 146 for its support on the bodywork element 140; an internally threaded metal pin 135 is intended to receive the antenna strand; the metal pin 135 extends along a cylindrical tail 136, the axis of which is inclined relative to the axis of the pin 135, internally hollowed out by a thread 155; the pin 135 and the tail 136, in one piece, are molded, inside the hollow piece 134, by a plastic material 137 of relatively low hardness, compressible, and the end of the tail 136 which projects beyond the hollow part 134 is overmolded with an insulator 142 of relatively low hardness also; the cross section of the insulator 142 is of generally rectangular shape, except for a protruding positioning appendage 144; when the base 130 is placed on the body element 140, the end of the insulator 142 passes through an opening 141, of this element, of
  • the base 130 which has just been described is adapted to cooperate with a tip 120 of coaxial cable.
  • the tip 120 is of the type of the tip 20 described above and produced by the assembly of annular parts 221, 222, 223, 224 similar to parts 21, 22, 123, 24, respectively, described above; the difference between the end piece 120 and the end piece 20 is that the annular parts 221, 222, 223 are of rectangular sections instead of circular ones; in addition, the insulating annular piece 223 carries, in one piece with it, four balusters 139 adapted to take place in four chimneys 138 provided in the base 130.
  • a housing 150 can be associated with the tip 120, a housing 150, a plate 100, a protector 170, a cover 153, similar, respectively, to the housing 50, to the plate 10, to the protector 70, to the cover 53 , except for their outer outline which is rectangular instead of circular.
  • a threaded rod 131 which plays the role of the preceding threaded rod 31, is not carried by the base 130 but is the threaded rod 131 of a screw 151 having a head 132 provided with a face transverse support 133 for cooperation with the entry face of the plate 100, the screw 151 being adapted to be screwed into the internal thread 155 of the base 130.
  • the insulating annular part 223 also differs from the annular part 123 in that the centering surface is produced by an axial annular extension 169 on which the annular core part 224 is centered, the external face of the extension 169 being flush with the external face of the annular core piece 224; thus, it is the radial thickness of the extension 169 which physically defines the isolation space between the threaded rod 131 and the annular core part 224.
  • the assembly when assembled and mounted, takes up little space axially under the bodywork element 140, which is well suited to the rear of a vehicle where the space available for the vehicle interior between the vehicle roof and the interior trim is more reduced than at the front; for this reason also, the supply wire 76 is mounted transversely with respect to the wafer 100, as illustrated in phantom in FIG. 6.
  • clipping pins 145 are provided at the edge of the insulation 142 of the base 130 for temporary clipping thereof on the edges of the opening 141 of the 'body element 140; from inside the vehicle, it is then possible to mount the sub-assembly constituted by the end piece 120, the housing 150, the plate 100 and the protector 170 on the base by introducing the balusters 139 in the chimneys 138 of the 'base 130; longitudinal ribs 147 are provided inside the chimneys 138, in line with the insulation 142, the balusters 139 being thus momentarily held by elastic clamping of the material, and it is possible to let go of the sub-assembly, to present and to screw the screw 151; the introduction of the balusters 139 in the chimneys 138 causes the material of the insulator 142 to swell, due to the ribs 147, which reinforces the effect of holding the clipping pins 145 on the bodywork element 140.
  • each bead 247 is in line with a pin 145; the beads 247 play the same role, described above, as that of the columns 139; chimneys 138 can also have a slightly conical shape, as shown in Figure 8.

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  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)
EP19950402681 1994-12-30 1995-11-29 Kraftfahrzeugantenne und Anpassungsvorrichtung mit aktiver Impedanz für eine solche Antenne Expired - Lifetime EP0720250B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9415928A FR2729010B1 (fr) 1994-12-30 1994-12-30 Antenne pour vehicule automobile susceptible de recevoir un adaptateur actif d'impedance et ensemble adaptateur actif d'impedance pour une telle antenne
FR9415928 1994-12-30

Publications (2)

Publication Number Publication Date
EP0720250A1 true EP0720250A1 (de) 1996-07-03
EP0720250B1 EP0720250B1 (de) 2000-03-01

Family

ID=9470462

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Application Number Title Priority Date Filing Date
EP19950402681 Expired - Lifetime EP0720250B1 (de) 1994-12-30 1995-11-29 Kraftfahrzeugantenne und Anpassungsvorrichtung mit aktiver Impedanz für eine solche Antenne

Country Status (4)

Country Link
EP (1) EP0720250B1 (de)
DE (1) DE69515281T2 (de)
ES (1) ES2143024T3 (de)
FR (1) FR2729010B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351395A (en) * 1999-06-16 2000-12-27 Zendar Spa Car aerial connector with shielding cap and fixing screw retention means
EP1648049A1 (de) * 2004-10-12 2006-04-19 Harada Industry Co., Ltd. Antennenhaltevorrichtung
CN105990771A (zh) * 2015-02-02 2016-10-05 德尔福中央电气（上海）有限公司 一种螺栓连接器锁定装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563946A1 (fr) * 1984-05-07 1985-11-08 Mecaniplast Dispositif de raccord pour une embase d'antenne destinee a etre fixee sur une paroi et capuchon d'antiparasitage pour un tel dispositif
FR2677177A3 (en) * 1991-04-29 1992-12-04 Zendar Spa Contact and rapid fixing device for use with car radio aerials

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563946A1 (fr) * 1984-05-07 1985-11-08 Mecaniplast Dispositif de raccord pour une embase d'antenne destinee a etre fixee sur une paroi et capuchon d'antiparasitage pour un tel dispositif
FR2677177A3 (en) * 1991-04-29 1992-12-04 Zendar Spa Contact and rapid fixing device for use with car radio aerials

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2351395A (en) * 1999-06-16 2000-12-27 Zendar Spa Car aerial connector with shielding cap and fixing screw retention means
GB2351395B (en) * 1999-06-16 2002-12-11 Zendar Spa Quickly-mounted pre-assembled connector for car radio sets
EP1648049A1 (de) * 2004-10-12 2006-04-19 Harada Industry Co., Ltd. Antennenhaltevorrichtung
US7215291B2 (en) 2004-10-12 2007-05-08 Harada Industry Co., Ltd Antenna device
KR100756146B1 (ko) 2004-10-12 2007-09-05 하라다 고교 가부시키가이샤 안테나 장치
CN105990771A (zh) * 2015-02-02 2016-10-05 德尔福中央电气（上海）有限公司 一种螺栓连接器锁定装置
CN105990771B (zh) * 2015-02-02 2023-12-08 安波福中央电气（上海）有限公司 一种螺栓连接器锁定装置

Also Published As

Publication number Publication date
DE69515281T2 (de) 2000-11-30
DE69515281D1 (de) 2000-04-06
ES2143024T3 (es) 2000-05-01
EP0720250B1 (de) 2000-03-01
FR2729010B1 (fr) 1997-04-11
FR2729010A1 (fr) 1996-07-05

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