JPH11127012A - High-frequency glass antenna for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain strong directivity by reflecting a radio wave from the inside of a cabin by a conductive film so that it will not impinge on the high-frequency glass antenna. SOLUTION: As a windshield glass plate, a laminated glass plate constituted by adhering an outer windshield plate 2a and an inner windshield plate 2b is used. The high-frequency glass antenna 6 is provided on the internal flank of the outer windshield plate 2a or the outside flank of the inner windshield plate 2b and a conductive film 5 is provided on the cabin-side surface of the inner windshield plate 2b facing the high-frequency glass antenna 6. To prevent noise from reaching the high-frequency glass antenna by reflecting a noise radio wave from the inside of the cabin by the conductive film 5 and to reduce radiation to a human body at the time of transmission from the high-frequency glass antenna 6, the conductive film 5 is provided preferably over the entire range of the windshield plate. The area where the conductive film 5 is provided is preferably an area where the radio wave from the inside of the cabin is reflected by the film 5 and not impinges on the high-frequency glass antenna 6 to obtain directivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to communication means for, for example, GPS artificial satellite signals (1575.42 MHz) and the 800 MHz band (810 to 960 MHz) of automobile telephones.
Or 1.5 GHz band (1.429 to 1.501 GHz)
The present invention relates to a high-frequency glass antenna for a vehicle, which is preferable for a vehicle communication means utilizing the same.

[0002]

2. Description of the Related Art Conventionally, a glass antenna for a car telephone as shown in FIG. 4 has been used as a transmitting / receiving antenna used for a car telephone. 4, 1 is an antenna conductor, 2 is a window glass plate (in FIG. 4, a front window glass plate is adopted), 6 is a high-frequency glass antenna, 8 is a feeding point, and 9 is a ground point.

[0003]

FIG. 5 shows the directivity characteristics at 900 MHz of the glass antenna for a mobile phone shown in FIG. In FIG. 5, the 0 ° direction is the front of the car, and the 90 ° direction is the left side of the car. As can be seen from FIG. 5, the reception sensitivity from the rear is slightly lower than the reception sensitivity at the front, and has directional characteristics. However, it is not sufficient to obtain a glass antenna having stronger directional characteristics.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a high-frequency glass antenna for an automobile in which a high-frequency glass antenna is provided on a window glass plate of an automobile. A laminated glass plate in which the outer window glass plate and the inner window glass plate are bonded is used, and a high-frequency glass antenna is provided on the inner side surface of the outer window glass plate or the outer side surface of the inner window glass plate, A high-frequency glass antenna for automobiles, characterized in that a film or layer made of a conductive material is provided on an inner side surface of an inner glass plate facing the high-frequency glass antenna.

In a high-frequency glass antenna for an automobile in which a high-frequency glass antenna is provided on a window glass plate of an automobile, the window glass plate of the automobile has an intermediate portion between an outside window glass plate and an inside window glass plate. A laminated glass plate is used in which the outer window glass plate and the inner window glass plate are adhered to each other with the film interposed therebetween. Provided is a high-frequency glass antenna for an automobile, wherein a film or a layer made of a conductive material is provided on an inner side surface of a glass plate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a configuration of a typical example of a high-frequency glass antenna for an automobile according to the present invention and showing a configuration at a stage before manufacturing, and FIG. FIG. In FIGS. 1 and 2, reference numeral 2a denotes an outside window glass plate, 2b denotes an inside window glass plate, 3 denotes an intermediate film made of a synthetic resin, and 5 denotes a film or layer made of a conductive material (hereinafter, referred to as a conductive film). The conductive film 5 preferably has transparency in order to secure a visual field.

The range in which the conductive film 5 is provided is not particularly limited, and may be a part of the window glass plate 2. However, it is preferable that the antenna is provided in a range that is equal to or larger than the range surrounding the entire high-frequency glass antenna 6 from the viewpoint that the directivity is further improved.

Further, when it is desired to reflect the radio wave of noise from the inside of the vehicle with the conductive film and to prevent noise from entering the high-frequency glass antenna 6 as much as possible, it is preferable to provide the entire area of the window glass plate 2. In addition, it is preferable to provide the entire area of the window glass plate 2 even when it is desired to reduce radiation to the human body when transmitting from the high-frequency glass antenna in an automobile telephone or the like.

The area where the conductive film 5 is provided is preferably provided in an area where radio waves from the inside of the vehicle are reflected by the conductive film 5 and do not hit the high-frequency glass antenna 6 in order to provide directivity. In other words, the conductive film 5 is provided in a region on the vehicle interior side surface of the vehicle interior glass plate 2b facing the high frequency glass antenna.

[0010] The laminated glass plate is manufactured by bonding the outside window glass plate 2a and the inside window glass plate 2b with an adhesive. The intermediate film 3 is provided as necessary to enhance safety.

As the conductive material, a metal such as silver is usually used. However, other substances such as carbon may be used. The thickness of the conductive film 5 is preferably made very thin to ensure transparency, and is usually 1 μm or less. Note that the conductive film 5 may also be used as a heat ray reflective film.

In FIG. 1, the location where the high-frequency glass antenna 6 is provided is provided on the inner side surface of the outer window glass plate 2a. However, the present invention is not limited to this, and may be provided on the vehicle exterior surface of the vehicle interior window glass plate 2 b or may be provided on the interlayer film 3.

The high-frequency glass antenna 6 according to the present invention shown in FIG. 2 has an antenna conductor 1, a feeding point 8 and a grounding point 9.
Is provided. The high-frequency glass antenna 6 is connected to the feeding point 8 and, in the case of reception, sends a reception signal between the feeding point 8 and the ground point 9 to a receiver (not shown).

In the case of transmission, a transmission signal is applied between the feeding point 8 and the ground point 9. Thus, the high-frequency glass antenna of the present invention shown in FIG. 1 is a dipole antenna. However, the present invention is not limited to this, and the glass antenna of the present invention may be a glass antenna having a shape and dimensions different from those in FIG. 1 or a single-pole antenna.

FIG. 6 is a front view of another type of high-frequency glass antenna for automobiles, which is different from the high-frequency glass antenna for automobiles of FIG. 1, when viewed from outside the vehicle. The shape of the glass antenna 6 is different.

The high-frequency glass antenna for automobiles of the present invention is most suitable for communication of GPS artificial satellite signals (1575.42 MHz) and the like. In addition, 80
It is preferably used for the 0 MHz band (810 to 960 MHz) and the 1.5 GHz band (1.429 to 1.501 GHz). In addition, the present invention is not limited to these.
(6 to 90 MHz), and can be used for a frequency band from several tens of MHz to several GHz.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
The automotive high-frequency glass antenna shown in FIG. As the conductive film 5, silver having a thickness of 100 nm was provided on the inside surface of the inside glass plate 2b. High frequency glass antenna 6
Was set for GPS satellite signals. 1575.42M
The directional characteristics at Hz are shown in FIG.

[0018]

According to the present invention, since the radio wave from the inside of the vehicle is reflected by the conductive film so as not to hit the high-frequency glass antenna 6, a high-frequency glass antenna having strong directional characteristics can be obtained. Therefore, there is an advantage that a decrease in reception sensitivity due to phase interference is reduced even when the antenna is combined with a high-frequency glass antenna exhibiting another directional characteristic.

Further, since the radio wave of noise from the inside of the vehicle is reflected by the conductive film, it is possible to prevent noise from entering the high-frequency glass antenna 6. In addition, since the conductive film serves as a shield, radiation to the human body can be reduced when transmitting from a high-frequency glass antenna with an automobile phone or the like, and harm to the human body can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a typical example of a high-frequency glass antenna for a vehicle according to the present invention, showing a configuration before manufacturing.

FIG. 2 is a front view of FIG. 1 when viewed from outside the vehicle.

FIG. 3 is a directional characteristic diagram of the embodiment.

FIG. 4 is a configuration diagram of a conventional example.

5 is a directional characteristic diagram at 900 MHz of the conventional example of FIG. 4;

FIG. 6 is a front view of another type of high-frequency glass antenna for a vehicle different from the high-frequency glass antenna for a vehicle of FIG. 1 when viewed from outside the vehicle;

[Explanation of symbols]

 1: Antenna conductor 2a: Outside window glass plate 2b: Inside window glass plate 3: Intermediate film made of synthetic resin 5: Conductive film 6: High frequency glass antenna

Claims (2)

[Claims] A high-frequency glass antenna for an automobile, wherein a high-frequency glass antenna is provided on a window glass plate of an automobile, wherein the outside window glass plate and the inside window glass plate are bonded to the window glass plate of the automobile. A glass plate is used, and a high-frequency glass antenna is provided on the inside surface of the outside window glass plate or the outside surface of the inside window glass plate, and on the inside surface of the inside glass plate facing the high-frequency glass antenna. A high-frequency glass antenna for an automobile, comprising a film or a layer made of a conductive material. 2. A high-frequency glass antenna for an automobile in which a high-frequency glass antenna is provided on a window glass plate of an automobile, wherein the window glass plate of the automobile has an intermediate portion between an outside window glass plate and an inside window glass plate. A laminated glass plate is used in which the outside window glass plate and the inside window glass plate are adhered to each other with the film in between. A high-frequency glass antenna is provided in the intermediate film, and the inside of the vehicle opposes the high-frequency glass antenna. A high-frequency glass antenna for an automobile, wherein a film or a layer made of a conductive material is provided on an inner side surface of a glass plate.