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US 4,792,807 AGranted
Automobile antenna system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsJunzo Ohe, Hiroshi Kondo
Life of this patent
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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsJunzo Ohe, Hiroshi Kondo
Estimating the term…
An automobile antenna system which requires no pole antenna or the like projecting outwardly from the automobile body includes a high-frequency pickup, for example, comprising a loop antenna, which is incorporated within a portion of the vehicle body. The high-frequency pickup is secured to the rear window frame and the longitudinal side of the loop antenna which is partially exposed through the casing of the high-frequency pickup is disposed in the vicinity of an edge-moulding mounting retainer. The loop antenna picks up high-frequency surface currents which are caused by broadcast waves and which concentratively flow in the edge-moulding mounting retainer.
An automobile antenna system for detecting high-frequency surface currents induced on the automobile body by broadcast waves, said antenna system comprising:
Dependencies are inferred from the claim text.
No related US applications are recorded in the indexed filing history.
Characterised by the location of the antenna on the vehicle: side-mounted antennas, e.g. bumper-mounted, door-mounted
Antennas, i.e. radio aerials
Term ended 25 Mar 2006 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to an automobile antenna system and, more particularly, to an improved automobile antenna system for effectively detecting broadcast waves received by the automobile body and then supplying signals thus detected to various kinds of receivers mounted in the automobile.
2. Description of the Prior Art
The above and other objects, features and advantages of the present invention will become apparent from the following description of the preferred embodiment thereof, taken in conjunction with the accompanying drawings in which:
FIG. 1 is a perspective view showing the general construction of a preferred embodiment of the automobile antenna system in accordance with the present invention, in which an electromagnetic coupling type of high-frequency pickup is mounted on the rear periphery of the roof plate of an automobile;
FIG. 2 is a plan view showing in detail a state wherein the high-frequency pickup shown in FIG. 1 is fixed;
Preferred embodiments of the automobile antenna system in accordance with the present invention will be described below with reference to the accompanying drawings.
FIGS. 4 to 12 illustrate a process of finding the most efficient antenna mounting position in terms of reception through the distribution characteristics of high-frequency currents.
FIG. 4 shows that when external electromagnetic waves W such as broadcast waves pass through a vehicle body B made of conductive metal, surface currents I are induced at various points of the vehicle body B at levels corresponding to the intesities of electromagnetic waves passing therethrough. The present invention is aimed only at electromagnetic waves which belong to relatively high frequency bands of 50 MHz or greater, such as FM waves, television waves and others.