JP2742795B2 - Wind shield antenna structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a windshield antenna structure for a car phone, and more particularly to a windshield antenna structure for a diversity car phone.

2. Description of the Related Art An antenna for a car telephone is disclosed in
As shown in Japanese Unexamined Patent Publication (Kokai) No. H11-209, a pole-shaped antenna has been generally used.

Problems to be Solved by the Invention However, when a pole-shaped antenna is used as an antenna for a car phone, two antennas are required, one for transmission and one for reception, and further a radio reception antenna is required. When mounting an antenna or the like, three antennas are mounted on the vehicle body, which not only impairs the appearance but also impairs the field of view, and thus a solution has been desired.

SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna structure of a car telephone which does not impair the appearance and does not obstruct the field of view.

SUMMARY OF THE INVENTION An object of the present invention is to provide a first windshield antenna provided on a rear window of a vehicle and having a planar shape for both transmission and reception, and a second windshield antenna provided on a quarter window of the vehicle and having a planar shape dedicated to reception. And a windshield antenna structure comprising: a windshield antenna structure for a diversity type mobile phone, comprising: a second windshield antenna having an element width smaller than an element width of the first windshield antenna; Achieved by

According to the present invention, the first windshield antenna having a planar shape for both transmission and reception is provided in the rear window, so that radio waves arriving from the front and rear direction of the vehicle can be received. By being provided in the quarter window vertically with respect to the first windshield antenna, radio waves arriving from the vehicle width direction can be received, and a windshield antenna having a surface having excellent reception performance is used. Therefore, it is necessary to provide a windshield antenna that receives radio waves in the front and rear direction of the vehicle only in the rear window and a windshield antenna that receives radio waves in the width direction of the vehicle only in one side of the quarter window to receive radio waves from all directions. Becomes possible.

Further, in the present invention, reception is performed by a diversity system using two windshield antennas, and a reception wave having a better reception state is received from reception radio waves received by the two windshield antennas. Thus, it is possible to always receive a good call.

Furthermore, in the present invention, since the element width of the reception-only windshield antenna is smaller than the element width of the transmission / reception windshield antenna that performs transmission requiring high voltage, the reception-only windshield is used. Even if the antenna is laid out in a conspicuous place, it does not impair the appearance, so that the freedom of layout of the windshield antenna can be greatly improved, and therefore, it is possible to improve the aesthetics of the car Become.

In the present invention, a transmission / reception windshield antenna is provided below the rear window, and a reception-only windshield antenna is provided in the quarter window. In this way, by disposing the relatively shielded transmission / reception window shield antenna having a large element width in the relatively invisible rear window, the appearance is prevented from being impaired, and furthermore, it is disposed below the rear window. Therefore, it does not hinder the driver's view, and the receive-only windshield antenna is narrow and inconspicuous, so even if it is placed in a quarter window that is easy to see, it will not impair the appearance or impair the view. Interference is also effectively prevented.

Examples Hereinafter, based on the accompanying drawings, an embodiment of the present invention will be described.
Add a detailed explanation.

FIG. 1 is a schematic view of an automobile including a windshield antenna structure according to an embodiment of the present invention, and FIG. 2 is a schematic front view of a rear window thereof. FIG. 3 (a) is a schematic plan view of a transmission / reception windshield antenna, and FIG. 3 (b) is a schematic plan view of a reception-only windshield antenna.

In FIG. 1, a car phone 3 is installed adjacent to a driver's seat in a cabin 2 of a car 1, and a wireless device 6 operated by electricity supplied from a battery 4 via a power line 5 is provided. , Are electrically connected by a communication line 7. Two antenna lines 8 extend from the wireless device 6 and are connected to a reception-only windshield antenna 10 provided in the quarter window 9 and a transmission / reception window shield antenna 12 provided in the rear window 11, respectively. . As shown in FIG. 1, particularly FIG. 2, the transmission / reception window shield antenna 12 is provided below the rear window 11.

As shown in FIGS. 3 (a) and 3 (b), the element width of the transmission / reception windshield antenna 12 is relatively small so as not to generate excessive heat during transmission requiring a high voltage. On the other hand, the element width of the reception-only windshield antenna 10 is narrow.

Therefore, a dual-purpose windshield antenna
Reference numeral 12 is relatively conspicuous, but since it is disposed below the rear window 11, it is hardly noticeable and does not obstruct the driver's view. On the other hand, the reception-only windshield antenna 10
Although it is provided in the quarter window 9 which is relatively easily noticeable, its element width is so small that it does not stand out and does not obstruct the field of view.

Also, a windshield antenna 10 for reception only provided in the quarter window 9 so that the directions are different from each other.
And receive using the transmit / receive windshield antenna 12 provided in the rear window 11, and receive the received radio wave of the better reception state by the diversity system, so that the telephone reception is always good. It is possible to do so.

As described above, according to the present embodiment, the diversity system allows a good reception of the telephone at all times, and the windshield antenna 12 for both transmission and reception, which is relatively conspicuous, is located below the rear window 11 which is hardly noticeable. And a windshield antenna dedicated to reception provided in the quarter window 9 which is relatively easy to see
Since the element 10 has a narrow element width and is inconspicuous, even if two windshield antennas for a car phone are provided, the visibility is not obstructed and the appearance of the car is not impaired.

The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the invention described in the claims, which are also included in the scope of the present invention. Needless to say.

For example, in the above-described embodiment, the transmission / reception windshield antenna 12 is provided below the rear window 11 and the reception-only windshield antenna 10 is provided in the quarter window 9, respectively. The installation position is not particularly limited, except for a special portion such as the center of the front window, because it is inconspicuous itself.
However, if it is hard to see, it can be placed in another window.

Effects of the Invention According to the present invention, there is provided a windshield antenna structure for a car telephone that enables high-sensitivity transmission and reception without impairing the appearance of the car or obstructing the field of view.

Further, according to the present invention, the degree of freedom of the layout of the windshield antenna can be greatly improved, and the aesthetic appearance of the vehicle can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of an automobile including a windshield antenna structure according to an embodiment of the present invention, and FIG. 2 is a schematic front view of a rear window thereof. FIG. 3 (a) is a schematic plan view of a transmission / reception windshield antenna.
FIG. 1B is a schematic plan view of a reception-only windshield antenna. 1 ... car, 2 ... cabin, 3 ... car phone, 4 ... battery, 5 ... power line, 6 ... radio, 7 ... communication line, 8 ... antenna line, 9 ... quarter Wind, 10 ... Reception only windshield antenna, 11 ... Rear window, 12 ... Transmitting and receiving windshield antenna.

Claims (1)

(57) [Claims] A first windshield antenna provided on a rear window of a vehicle and having a planar shape for both transmission and reception;
And a second windshield antenna having a receiving-only planar shape provided on a quarter window of the vehicle.
A windshield antenna structure wherein the element width of the second windshield antenna is smaller than the element width of the first windshield antenna.