US3611388A - Automobile antenna mounted on trunk lid - Google Patents

Automobile antenna mounted on trunk lid Download PDF

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Publication number
US3611388A
US3611388A US45046A US3611388DA US3611388A US 3611388 A US3611388 A US 3611388A US 45046 A US45046 A US 45046A US 3611388D A US3611388D A US 3611388DA US 3611388 A US3611388 A US 3611388A
Authority
US
United States
Prior art keywords
antenna
cover
metallic films
band
disposed
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.)
Expired - Lifetime
Application number
US45046A
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English (en)
Inventor
Osamu Okumura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Application granted granted Critical
Publication of US3611388A publication Critical patent/US3611388A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01Q1/40—Radiating elements coated with or embedded in protective material

Definitions

  • the disclosed antenna comprises a circular metallic film centrally disposed on a plastic over for a motorcars trunk, another metallic film disposed on its remaining portion, and a coil interconnecting them.
  • the coil exhibits a high impedance for the FM broadcasting band and a negligibly low impedance for the medium wave AM broadcasting band. Both films are effective for medium wave band while only the circular film is effective for the FM band.
  • This invention relates to an antenna for a radio set equipped on a motorcar and particularly to such an antenna utilizing a trunks cover on a motorcar.
  • the conventional type of antenna as referred to has comprised the trunk's cover formed of a sheet metal and electrically insulated from the body thereof through mountings for hinge and locking devices and the periphery of the opening adapted to be closed by the trunks cover.
  • the trunk's cover formed of a sheet metal and electrically insulated from the body thereof through mountings for hinge and locking devices and the periphery of the opening adapted to be closed by the trunks cover.
  • the entire area of the trunks cover has become unfitted for use as an antenna for use with a motorcar.
  • the impedance of such an antenna has greatly varied with respect to the frequency of the radio wave in accordance with the shape and dimension of the cover resulting in a increase in loss due to mismatch between the antenna and the associated radio set.
  • the antenna has increased in directivity. It is highly desirable to provide an antenna for use with a motor car utilizing through the trunks cover thereof to be selectively used for at least one pair of different frequency bands.
  • the invention accomplishes the aforesaid objects by the provision of an antenna on a motorcar selectively used for at least one pair of different frequency bands, comprising a plastic cover disposed so as to normally close an upper opening of a trunk on the motorcar, a pair of metallic films in the form of foils or gauzes disposed on the trunks cover, an electromagnetic coil disposed on the cover between the metallic films to interconnect them, and an electric able connected to one of the metallic films.
  • the electromagnetic coil may have its inductance the exhibits a high impedance for the higher frequency band and a negligibly low impedance for the lower frequency band.
  • One of the metallic films may advantageously be in the form of a circle having a diameter substantially equal to a quarter a wavelength of the FM broadcasting band.
  • FIG. 1 is a fragmental perspective view of a motorcar embodying the principles of the invention as viewed from the tail end thereof with some parts illustrated in phantom;
  • FIG. 2 is a vertical sectional view taken along the line "-11 of H6. 1.
  • an arrangement disclosed herein comprises a body 1 of a motorcar, a trunk 2 (see FIG. 2) disposed on the rear portion of the body 1 and having an opening on the upper side, an electric insulation 4 fixedly secured to the entire peripheral edge of the opening 3, and a cover 5 disposed on the opening 3 of the trunk 2 to normally close the latter through the peripheral insulation 4.
  • the trunks cover 5 is formed of any suitable electrically insulating plastic such as an expoxide resin and supported to appropriate portions of the body 1 throughhinge devices 6 fixed at both ends to those trunk portions and amounting 7 disposed on the internal surface of the cover 5 as best shown in FIG. 2.
  • the cover 5 is normally locked to the body 1 through a locking device 8 fixed at both ends to a suitable portion of the body I and. another mounting 9 disposed on the intemalsurface of the cover 5 as shown in FIG. 2. Both mountings 7 and 9 are preferably of a suitable electrically insulating material.
  • the cover 5 has fixedly secured on the central portion of the internal surface a film 10 of any suitable electrically conductive material such as copper in the form of a circular foil or gauze having a diameter of-D.
  • the cover 5 is also provided on that portion of the internal surface other than those portions thereof on which the metallic film l0 and the mountings 7 and 9 are fixed with a second metallic film 11 in the fonn of a foil or a gauze to form a suitable gap between the same and the metallic film 10.
  • the second metallic film 11 is preferably formed of the same electrically conductive material as the film l0 and electrically insulated from the body 1 through the mountings 7 and 9 on the cover 5 and the insulation 4 disposed on the peripheral edge of the opening 3.
  • an electromagnetic coil 12 is disposed on the internal surface of the cover 5 between the metallic films l0 and II to be electrically connected at both ends to appropriate portions in this case the opposite portions of both films.
  • an antenna cable 13 is electrically coupled to the metallic film 10 and a radio set (not shown) equipped on the body by having its inner conductor 14 connected at both ends to the film l0 and an input to that radio set and its outer conductor 15 connected to the body I as shown by the symbol GROUND.
  • the dimension or diameter D of the metallic film 10 can be substantially equal to a quarter the wavelength of the FM broadcasting band or about centimeters while the coil 12 is selected'to have its inductance exhibiting a high impedance for the FM band and a negligibly small impedance for the medium wave hand.
  • the inductance may be of a few microhenries.
  • the metallic film 10 is electrically isolated from the metallic film 11 through a high impedance exhibited by the coil 12 with the result that only the metallic film 10 is effective for operating as an antenna. Since the metallic film 11 is in the form of a simple circle, that antenna formed of the film ll alone exhibits the impedance characteristic small in variation over the FM broadcasting band while it is substantially of nondirectional type leading to a very effective antenna. It is noted that for the FM broadcasting band, there is present a high capacitance between the metallic film l1 and that portion of the body 1 forming the peripheral edge of the trunks opening 3. This results in the formation of a low impedance electrically connecting the metallic film 11 to the body 1. That is the film 11 can be regarded to be an electrical extension of the body 1 or the ground side.
  • the invention provides an antenna for use with a motorcar selectively usable for a pair of different frequency bands without switching the antenna. Further it resembles in behavior the prior art type of antennas for lower frequencies and it is still fitted for the higher frequencies resulting in a great utility.
  • the metallic films serve to mechanically reinforce the plastic trunks cover.
  • trunks cover may be of a structure in which the metallic films are sandwiched between a pair of plastic laminations.
  • An antenna on a motorcar selectively used for at least one pair of different frequency bands, comprising a plastic cover disposed so as to normally close an upper opening of a trunk on the motorcar, a pair of metallic films disposed on the said trunks cover, an electromagnetic coil disposed on said cover between said metallic films to interconnect them, and an electric conductor connected to only one of said metallic films.
  • An antenna as claimed in claim 1 wherein said elec-' tromagnetic coil has an inductance exhibiting a high impedance for the higher frequency band and a substantially negligibly low impedance for the lower frequency band.
  • one of said metallic films is in the form of a circle having a diameter substantially equal to a quarter the wavelength of the FM broadcasting band providing the higher frequency band.

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
US45046A 1969-06-13 1970-06-10 Automobile antenna mounted on trunk lid Expired - Lifetime US3611388A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44046715A JPS4836583B1 (da) 1969-06-13 1969-06-13

Publications (1)

Publication Number Publication Date
US3611388A true US3611388A (en) 1971-10-05

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ID=12755030

Family Applications (1)

Application Number Title Priority Date Filing Date
US45046A Expired - Lifetime US3611388A (en) 1969-06-13 1970-06-10 Automobile antenna mounted on trunk lid

Country Status (2)

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US (1) US3611388A (da)
JP (1) JPS4836583B1 (da)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546357A (en) * 1983-04-11 1985-10-08 The Singer Company Furniture antenna system
US4707701A (en) * 1984-10-26 1987-11-17 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4717922A (en) * 1984-11-06 1988-01-05 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4717921A (en) * 1984-11-15 1988-01-05 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4721963A (en) * 1986-07-25 1988-01-26 General Motors Corporation Vehicle roof mounted slot antenna with separate AM and FM feeds
US4723127A (en) * 1984-12-12 1988-02-02 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
EP0262755A1 (en) * 1986-07-25 1988-04-06 General Motors Corporation Vehicle roof mounted slot antenna with am and fm grounding
US4754284A (en) * 1984-11-15 1988-06-28 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4758166A (en) * 1986-04-07 1988-07-19 Ford Motor Company Concealed radio antenna
US4789866A (en) * 1984-11-08 1988-12-06 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4792807A (en) * 1985-03-27 1988-12-20 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4794397A (en) * 1984-10-13 1988-12-27 Toyota Jidosha Kabushiki Kaisha Automobile antenna
US4804966A (en) * 1984-10-29 1989-02-14 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4804968A (en) * 1985-08-09 1989-02-14 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
US4804967A (en) * 1985-10-29 1989-02-14 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
US4806942A (en) * 1985-06-10 1989-02-21 Toyota Jidosha Kabushiki Kaisha Automobile TV antenna system
US4811024A (en) * 1984-10-17 1989-03-07 Toyota Jidosha Kabushiki Kaisha Automobile antenna
US4816837A (en) * 1985-08-01 1989-03-28 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4819001A (en) * 1984-11-26 1989-04-04 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4821040A (en) * 1986-12-23 1989-04-11 Ball Corporation Circular microstrip vehicular rf antenna
US4821042A (en) * 1985-06-28 1989-04-11 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
US4823142A (en) * 1985-06-21 1989-04-18 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4845505A (en) * 1987-02-13 1989-07-04 Toyota Jidosha Kabushiki Kaisha Automobile antenna system for diversity reception
US4866453A (en) * 1988-08-15 1989-09-12 General Motors Corporation Vehicle slot antenna with parasitic slot
DE4002899A1 (de) * 1990-02-01 1991-08-08 Bosch Gmbh Robert Fahrzeugantenne aus einer elektrisch leitenden wand mit einem ringspalt
US5952981A (en) * 1995-08-24 1999-09-14 Mcc Corporation Antenna for reducing an effect of a radio wave blocking obstacle
WO2002015332A1 (de) * 2000-08-12 2002-02-21 Robert Bosch Gmbh Antennenanordnung
US20030209920A1 (en) * 2001-07-24 2003-11-13 Corinna Fuchs Plate in a motor vehicle with a metallic support structure
US6906672B1 (en) 2003-07-25 2005-06-14 R.A. Miller Industries, Inc. Planar Antenna Arrangement
RU2313161C2 (ru) * 2002-02-22 2007-12-20 Катрайн-Верке Кг Антенна для приемного и/или передающего устройства, в частности, в качестве антенны для автомобиля, установленной на его крыше

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546357A (en) * 1983-04-11 1985-10-08 The Singer Company Furniture antenna system
US4794397A (en) * 1984-10-13 1988-12-27 Toyota Jidosha Kabushiki Kaisha Automobile antenna
US4811024A (en) * 1984-10-17 1989-03-07 Toyota Jidosha Kabushiki Kaisha Automobile antenna
US4707701A (en) * 1984-10-26 1987-11-17 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4804966A (en) * 1984-10-29 1989-02-14 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4717922A (en) * 1984-11-06 1988-01-05 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4789866A (en) * 1984-11-08 1988-12-06 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4717921A (en) * 1984-11-15 1988-01-05 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4754284A (en) * 1984-11-15 1988-06-28 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4819001A (en) * 1984-11-26 1989-04-04 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4723127A (en) * 1984-12-12 1988-02-02 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4792807A (en) * 1985-03-27 1988-12-20 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4806942A (en) * 1985-06-10 1989-02-21 Toyota Jidosha Kabushiki Kaisha Automobile TV antenna system
US4823142A (en) * 1985-06-21 1989-04-18 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4821042A (en) * 1985-06-28 1989-04-11 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
US4816837A (en) * 1985-08-01 1989-03-28 Toyota Jidosha Kabushiki Kaisha Automobile antenna system
US4804968A (en) * 1985-08-09 1989-02-14 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
US4804967A (en) * 1985-10-29 1989-02-14 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
US4758166A (en) * 1986-04-07 1988-07-19 Ford Motor Company Concealed radio antenna
US4737795A (en) * 1986-07-25 1988-04-12 General Motors Corporation Vehicle roof mounted slot antenna with AM and FM grounding
EP0262755A1 (en) * 1986-07-25 1988-04-06 General Motors Corporation Vehicle roof mounted slot antenna with am and fm grounding
US4721963A (en) * 1986-07-25 1988-01-26 General Motors Corporation Vehicle roof mounted slot antenna with separate AM and FM feeds
US4821040A (en) * 1986-12-23 1989-04-11 Ball Corporation Circular microstrip vehicular rf antenna
US4845505A (en) * 1987-02-13 1989-07-04 Toyota Jidosha Kabushiki Kaisha Automobile antenna system for diversity reception
US4866453A (en) * 1988-08-15 1989-09-12 General Motors Corporation Vehicle slot antenna with parasitic slot
EP0358308A1 (en) * 1988-08-15 1990-03-14 General Motors Corporation Vehicle slot antenna with parasitic slot
DE4002899A1 (de) * 1990-02-01 1991-08-08 Bosch Gmbh Robert Fahrzeugantenne aus einer elektrisch leitenden wand mit einem ringspalt
US5952981A (en) * 1995-08-24 1999-09-14 Mcc Corporation Antenna for reducing an effect of a radio wave blocking obstacle
WO2002015332A1 (de) * 2000-08-12 2002-02-21 Robert Bosch Gmbh Antennenanordnung
US20030209920A1 (en) * 2001-07-24 2003-11-13 Corinna Fuchs Plate in a motor vehicle with a metallic support structure
US6840563B2 (en) * 2001-07-24 2005-01-11 Cts Farhrzeug-Dachsystems Gmbh Plate in a motor vehicle with a metallic support structure
RU2313161C2 (ru) * 2002-02-22 2007-12-20 Катрайн-Верке Кг Антенна для приемного и/или передающего устройства, в частности, в качестве антенны для автомобиля, установленной на его крыше
US6906672B1 (en) 2003-07-25 2005-06-14 R.A. Miller Industries, Inc. Planar Antenna Arrangement

Also Published As

Publication number Publication date
JPS4836583B1 (da) 1973-11-06

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