Automobile antenna and method of manufacturing the same

Details Automobile antenna and method of manufacturing the same Automobile antenna and method of manufacturing the same

1990-09-24

1992-09-29

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With vehicle

343DIG1, H01Q 1320, H01Q 1270

Patent

active

051517116

ABSTRACT:
An automobile antenna of a rod shape comprises an antenna element and a hollow cylindrical member of a resin fitted on the circumference of the antenna element. The hollow cylindrical member includes a plurality of hollow cylindrical units that may be coupled together or may be spaced apart. The cylindrical member has a ridge or ridges in the form of a spiral or ring. The ridge functions to generate a turbulent flow of air when the automobile runs at a high speed, so that a whistling sound generated by the wind blow may be eliminated. The method of making an antenna uses two offset molds having a plurality of cavities by the provision of spaced apart partitions, which also support the antenna element. A molding material is supplied into the cavities so that the ridges-bearing cylindrical member and the antenna element may be fabricated as one unit. Portions of the antenna element supported by the partitions, after molding operation, are exposed externally to attain an improved whistling sound elimination function.

REFERENCES:
patent: 4160979 (1979-07-01), Drewett
patent: 4163981 (1979-08-01), Wilson
patent: 4379298 (1983-04-01), Vincent et al.
patent: 4435713 (1964-03-01), Gasparaitis et al.
patent: 4675687 (1987-06-01), Elliot
Motorola Technical Disclosure Bulletin, vol. 6, No. 1, Oct. 1986, pp. 24-25, T. L. Higby et al., "High Frequency Whip Antenna (800 MHZ)".

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