Windowpane antenna apparatus for vehicles

Details Windowpane antenna apparatus for vehicles Windowpane antenna apparatus for vehicles

1999-09-24

2001-04-03

Wong, Don (Department: 2821)

Communications: radio wave antennas

Antennas

With vehicle

C343S704000

Reexamination Certificate

active

06211832

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a windowpane antenna apparatus for vehicles which is mounted on a windowpane of a vehicle such as an automobile.
There is a windowpane antenna apparatus for automobiles as the most typical one of conventional windowpane antenna apparatuses for vehicles. The typical antenna apparatus includes a thin, narrow, strip conductor provided on a window (usually a rear window) of an automobile, and the strip conductor is employed as an antenna.
In recent automobiles, a defogger is provided almost all over the rear window to serve as a heater for defogging the window. The antenna therefore has to be mounted in a limited space between the defogger and the window frame.
FIG. 8
shows an example of a prior art automobile windowpane antenna apparatus. As shown, a defogger
110
is mounted on a rear window
100
, and a loop-shaped antenna
120
constituted of a strip conductor is formed in a region above the defogger
110
.
A DC power supply voltage is applied to the defogger
110
from a car-mounted battery
111
through a noise filter
112
(which is constituted of, e.g., a choke coil and a capacitor) for eliminating high-frequency noise (in the AM band) and a power supply voltage application line
113
.
A reception signal of the antenna
120
is transmitted to a receiver set such as a radio from a feeding point
121
through a feeding cable (not shown).
FIGS. 9
to
11
are illustrations for explaining the performance of the prior art automobile windowpane antenna apparatus described above. These illustrations are used to describe an automobile windowpane antenna apparatus according to an embodiment of the present invention in comparison with the prior art apparatus.
The prior art antenna apparatus has the problem that its reception sensitivity in the AM and FM bands is not obtained sufficiently since a space for mounting the antenna
120
is limited. The apparatus also has the problem that since frequency characteristics are not flattened within a receiving band, tuning for optimizing the reception performance is difficult and a long period of time is required for performing the tuning operation.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to provide a windowpane antenna apparatus for vehicles whose reception sensitivity is high in a wide bandwidth and whose tuning operation is easy to perform.
To attain the above object, a vehicle windowpane antenna apparatus according to the present invention has the following features in constitution. The other features will be clarified later in the Description of the Invention.
A windowpane antenna apparatus for vehicles comprises a defogger mounted on a window of a vehicle, for defogging the window, means for causing the defogger to serve as a slot antenna, and a driven antenna arranged close and opposite to the defogger with a given gap therebetween in such a manner that one side of the driven antenna is mutually coupled to one side of the defogger.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.


REFERENCES:
patent: 4063247 (1977-12-01), Sakurai et al.
patent: 5097270 (1992-03-01), Flachenecker et al.
patent: 5113195 (1992-05-01), Sakurai et al.
patent: 5610618 (1997-03-01), Adrian et al.
patent: 5654720 (1997-08-01), Saitou et al.
patent: 5877727 (1999-03-01), Saito et al.
patent: 5933119 (1999-08-01), Fujii et al.
patent: 6043783 (2000-03-01), Endo et al.

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