AUTOMOBILE ANTENNA MOUNTED ON TRUNK LID

• US 3,611,388 A
• Filed: 06/10/1970
• Issued: 10/05/1971
• Est. Priority Date: 06/13/1969
• Status: Expired due to Term

• Current Assignee: Osamu Okumura
• Original Assignee: Osamu Okumura
• Inventors: Okumura, Osamu
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/045,046
• Time in Patent Office: 482 Days
• Field of Search: 343/711,712,713,725,729,722,873
• US Class Current: 343/712
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 1/40 Radiating elements coated with or embedded in protective material

Abstract

The disclosed antenna comprises a circular metallic film centrally disposed on a plastic over for a motorcar'"'"''"'"'s 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.

Claims

1. 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 trunk'"'"''"'"'s 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.

2. An antenna as claimed in claim 1 wherein said metallic films are in the form of foils.

3. An antenna as claimed in claim 1 wherein said metallic films are in the form of gauzes.

4. An antenna as claimed in claim 1 wherein said electromagnetic coil has an inductance exhibiting a high impedance for the higher frequency band and a substantially negligibly low impedance for the lower frequency band.

5. An antenna as claimed in claim 1 wherein 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.

6. An antenna as claimed in claim 1 wherein said cover is formed of a pair of plastic laminations having said metallic foils sandwiched therebetween.