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Automobile-antenna-system

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Automobile antenna system

Details

Inventors: Ohe, Junzo; Kondo, Hiroshi;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Nussbaum; Marvin L.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman

An automobile antenna system includes a loop antenna disposed along a marginal edge portion of the vehicle body of an automobile for detecting broadcast waves flowing on the vehicle body. A high-frequency pickup which includes the loop antenna is rigidly clamped between a pair of brackets which are secured to the vehicle body through a vehicle body connecting piece. Accordingly, the loop antenna and the end portion of the vehicle body connecting piece on which broadcast waves are concentrated are accurately positioned relative to each other.

DETAILED DESCRIPTION In view of the above-described problems of the prior art, it is an object of the present invention to provide an improved antenna system for small-sized automobiles which is capable of effectively detecting currents induced in the vehicle body by broadcast waves and then transferring detected signals to various receivers located in the vehicle.
The high-frequency pickup of the present invention may be readily mounted in a systematic assembling operation and provides a uniform detecting performance.
It is another object of the present invention to provide an improved antenna system for small-sized automobiles which has an increased output sensitivity and an enlarged range of receivable frequency bands.
To these ends, the present invention provides an antenna system having a high-frequency pickup disposed adjacent to a marginal edge portion of the vehicle body for detecting surface high-frequency currents having a predetermined frequency or more, characterized in that an antenna assembly is previously formed from the high-frequency pickup, brackets and a vehicle body connecting piece, and this antenna assembly is integrally mounted on the vehicle body through the connecting piece which is secured to the vehicle body.
The prior art antenna systems mainly intend to receive AM band waves the wavelength of which are too long to obtain good performance by detecting surface currents induced on the vehicle body.
The inventors aimed at this dependency of frequency and made it possible to very efficiently attain the reception of signals from surface currents induced in the vehicle body by broadcast waves which are above FM frequency band (normally, above 50 MHz).
The inventors also aimed at the fact that such surface high-frequency currents are produced at various different locations of the vehicle body in various different densities.
Our invention is therefore characterized in that the high-frequency pickup is disposed at a location on the vehicle body which has the minimum level of noise and the maximum density of currents induced by broadcast waves

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