JPH1013125A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a non-directional glass antenna which is superior in reception sensitivity by permitting a max. interval within the intervals between respective sides of antenna conductors and respective opposed vehicle body opening parts, to be more than twice the specified times of the min. interval. SOLUTION: On a side window glass plate 2, the interval A in a right horizontal direction between first antenna conductor 3 being an outer most periphery and the vehicle body opening part 1, the interval B in an upward direction between the first conductor 3 and the vehicle body opening part 1, the interval C in a left horizontal direction between the first antenna conductor 3 and the vehicle body-opening part 1 and the interval D in a downward direction between the first antenna conductor 3 and the vehicle body-opening part 1 are set. Then, the max. interval within the intervals A-D is made to be more than the 1.5 times the interval of the min. interval. When it is more than 1.5 times, reception sensitivity is normally improved by more than 2-3dB, as compared with a case when it is less than 1.5 times. Thus, even when an area for providing the antenna conductors 3 and 5 is a small automobile, installing in a small space providing is possible. A sufficient visual field is secured, and a sufficient reception characteristic is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular glass antenna suitable for receiving radio and television broadcasts, and more particularly to a vehicular glass antenna suitable for being provided on a side window glass plate of an automobile.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, an antenna conductor 3 composed of a conductor pattern and a feed point 4 are provided on a side window glass plate 2 at the rear of an automobile, and this is used as an antenna to perform FM broadcasting. , Television broadcasts and the like. In this conventional example, the distance between each side of the antenna conductor 3 and each of the vehicle body opening portions 1 facing each other was substantially equal.

[0003]

The above-mentioned conventional antenna has a drawback that a broadcast wave from a specific direction can hardly be received in an environment having a high directivity. That is,
FIG. 8 is a directional characteristic diagram of the conventional example shown in FIG. 6, which shows the directional characteristic of the horizontal polarization plane. As can be seen from FIG. I will.

[0004] Further, for example, in the case of RV vehicles, the rear window glass plate is narrow, so that the area where the antenna conductor can be provided is small, and it is desired to develop a glass antenna which can be provided in a small space and has sufficient receiving characteristics. I was

[0005] In view of the above problems, an object of the present invention is to eliminate the above-mentioned disadvantages of the prior art.

[0006]

SUMMARY OF THE INVENTION The present invention provides a vehicle glass comprising a vehicle window glass plate provided with a feed point, and an antenna conductor extending from the feed point substantially parallel to the periphery of the window glass plate. In the antenna, the window glass plate has a substantially polygonal shape, and antenna conductors are provided so as to extend over two or more sides of the window glass plate. Provided is a glass antenna for a vehicle, wherein the maximum interval is at least 1.5 times the minimum interval.

[0007] Further, there is a plurality of antenna conductors, and the maximum interval among the intervals between each side of the outermost antenna conductor and each of the opposing body openings is at least 1.5 times the minimum interval. A glass antenna for vehicles.

The antenna conductor comprises a first antenna conductor and a second antenna conductor, and when viewed from either one of the surfaces of the window glass plate, the first antenna conductor having one end connected to the feeding point. Is extended clockwise starting from the feed point, and the second antenna conductor having one end connected to the feed point is extended counterclockwise so as to be surrounded by the first antenna conductor starting from the feed point. The glass antenna for vehicles described above is provided.

Further, the present invention provides the above-mentioned glass antenna for a vehicle, wherein an auxiliary antenna conductor is provided inside the antenna conductor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of a typical example of a glass antenna device for a vehicle according to the present invention.

In FIG. 1, 1 is a vehicle body opening, 2 is a side window glass plate at the rear of a substantially parallelogram-shaped automobile, 3 is a first antenna conductor extending clockwise starting from a feed point, 4 is a feeding point, 5 is a second antenna conductor extending counterclockwise starting from the feeding point, 6 is an auxiliary antenna conductor provided inside the first and second antenna conductors, 6a Are connection conductors, A, B,
C, D, K, L, and M are intervals. It should be noted that, in the drawings other than FIG.

In FIG. 1, the first antenna conductor 3 extends from the feed point 4 as a starting point, extends a predetermined distance downward and to the right, bends substantially in the right lateral direction, and is substantially parallel to the peripheral edge of the side window glass plate 2. In the clockwise direction, it is extended to the vicinity of the feeding point 4.

On the other hand, the second antenna conductor 5 extends substantially below the feed point 4 and the first antenna conductor 3
At a predetermined interval, and extends counterclockwise so as to be surrounded by the first antenna conductor 3, and extends to the vicinity of the feeding point 4.

In other words, the first antenna conductor and the second antenna conductor, each having one end connected to the feeding point,
The first antenna conductor 3 extends clockwise starting from the feeding point, and the second antenna conductor 5 extends counterclockwise starting from the feeding point so as to be surrounded by the first antenna conductor 3. It is provided on the side window glass plate 2.

In the present invention, the positional relationship between the first antenna conductor and the second antenna conductor is not limited to this, and the first antenna conductor having one end connected to the feeding point and the second antenna conductor are connected to each other.
The first antenna conductor extends clockwise starting from the feed point, and the second antenna conductor extends counterclockwise surrounding the first antenna conductor starting from the feed point. Then, it may be provided on a window glass plate.

The first antenna conductor 3 starts from the feed point 4 and does not need to be extended in the clockwise direction substantially parallel to the peripheral edge of the side window glass plate 2 to the vicinity of the feed point 4, but substantially. It is sufficient that the first antenna conductor 3 extends over two or more sides of the polygonal side window glass plate.

The second antenna conductor 5 does not need to extend from the feed point 4 to the vicinity of the feed point 4 in a counterclockwise direction substantially parallel to the peripheral edge of the side window glass plate 2. It is sufficient that the second antenna conductor 5 extends over two or more sides of the substantially polygonal side window glass plate.

However, both the first antenna conductor and the second antenna conductor are extended to the vicinity of the feeding point 4 so as to make a round substantially in parallel with the peripheral portion of the side window glass plate 2 in order to improve the receiving sensitivity. Is preferred. Also, there is no need to have a plurality of antenna conductors. However, when there are a plurality of antenna conductors, it is preferable that there are antenna conductors extending in the clockwise direction and the counterclockwise direction, respectively, in order to improve directivity.

However, a plurality of antenna conductors extending in the clockwise direction and the counterclockwise direction can be used without each.

In addition to the first antenna conductor and the second antenna conductor, one or a plurality of antenna conductors are used starting from the feed point 4 in a clockwise or counterclockwise direction substantially parallel to the periphery of the side window glass plate 2. It may be extended clockwise.

The auxiliary antenna conductor 6 is provided as needed. It is preferable to provide it for improving the receiving sensitivity.
In the case where the auxiliary antenna conductor 6 is provided, the reception sensitivity in a high frequency range such as an FM broadcast band is usually higher than the case where the auxiliary antenna conductor 6 is not provided.
It is improved by about 2 dB.

The auxiliary antenna conductor 6 is preferably provided inside the first antenna conductor and the second antenna conductor from the viewpoint of improving the receiving sensitivity. However, it is not limited to this,
It may be provided between the first antenna conductor and the second antenna conductor, or may be provided outside the first antenna conductor and the second antenna conductor.

Further, a plurality of auxiliary antenna conductors may be provided, and one or more phase adjusting elements having a substantially T-shape, a substantially L-shape, a loop shape or the like may be provided on the antenna conductor. Good.

The interval M and the interval L are determined by the first antenna conductor 3
It is set as appropriate in relation to the length and the like. The two antenna conductors 3 and 5 do not have to overlap, but when they do overlap, the interval K between the overlapping portions of the two antenna conductors 3 and 5 is preferably 50 mm or less and 0.2 mm or more. If it exceeds 50 mm, the receiving sensitivity does not become non-directional, and if it is less than 0.2 mm, problems such as difficulty in production occur.

Further, the portion where the first antenna conductor 3 and the second antenna conductor 5 overlap with each other at the interval K is 90 ° from the center of both antennas in terms of reception sensitivity.
The above is appropriate, more preferably 180 ° or more,
0 ° or more is particularly desirable.

Assuming that the wavelength of the desired reception frequency is λ and the shortening rate of the glass antenna is K, the first antenna conductor 3
The conductor length of each of the second antenna conductors 5 is
The range of (λK) / 2 to 2λK is preferable. When it is within this range, the receiving sensitivity is improved by several dB as compared with the case outside this range. The conductor length of the auxiliary antenna conductor 6 is
The range of (λK) / 4 to λK is preferable. When it is within this range, the receiving sensitivity is improved by several dB as compared with the case outside this range. Note that the glass shortening rate K is 0.64, and λ is usually set to approximately the center frequency of the broadcast band.

In FIG. 1, the interval A is the first outermost circumference.
Distance between the antenna conductor 3 and the vehicle body opening 1 in the right lateral direction,
The interval B is the upward interval between the first antenna conductor 3 and the vehicle body opening 1, the interval C is the left lateral interval between the first antenna conductor 3 and the vehicle body opening 1, and the interval D is the first antenna. Conductor 3
And the vehicle body opening 1 in the downward direction.

The intervals A, B, C, and D are usually preferably 5 mm or more, respectively, and are preferably 10 m or more in order to improve reception sensitivity.
m or more is particularly preferred.

It is necessary that the maximum interval among the intervals A, B, C, and D is at least 1.5 times the minimum interval. 1.
When it is 5 times or more, the reception sensitivity is usually improved by 2 to 3 dB or more as compared with the case where it is less than 1.5 times. It is preferable that the maximum interval among the intervals A, B, C, and D is 2.0 times or more the minimum interval. When it is 2.0 times or more, the reception sensitivity is usually improved by 1 to 2 dB or more as compared with the case of less than 2.0 times. It is more preferable that the maximum interval among the intervals A, B, C, and D is 3.0 times or more the minimum interval. When the ratio is 3.0 times or more, the reception sensitivity is usually improved by 1 to 2 dB or more as compared with the case where the ratio is less than 3.0 times.

Further, under the above conditions, the interval A,
Only one of B, C, and D is closer to each other than the opposing interval (for example, the interval A and the interval C correspond to the opposing interval).
It is preferably 1.5 times or more. When it is 1.5 times or more, it is usually 2 times smaller than when it is less than 1.5 times.
Up to 3 dB or more, the receiving sensitivity is improved. Also, intervals A, B,
Only one of C and D has a distance of 2.
More preferably, it is 0 times or more. When it is 2.0 times or more, it is usually 1 compared with the case of less than 2.0 times.
Up to 2 dB or more, the receiving sensitivity is improved. Also, intervals A, B,
2. Only one of C and D has an interval of opposing.
It is particularly preferred that the number be 0 times or more. When the ratio is 3.0 times or more, it is usually 1
Up to 2 dB or more, the receiving sensitivity is improved.

The shape of the auxiliary antenna conductor 6 is substantially T-shaped in FIG. However, it is not limited to this,
The shape may be substantially L-shaped, loop-shaped, or the like.

The position of the feeding point 4 is not particularly limited in terms of reception characteristics, but is preferably provided as close as possible to the periphery of the window glass plate in order to secure a view.

For the conductor patterns of the first antenna conductor 3, the second antenna conductor 5, the feeding point 4, and the like, a silver paste printed on a window glass plate and fired was used, but the present invention is not limited to this. Other metal pastes can be used,
A metal wire such as copper, a metal plate, or a metal foil may be bonded to the window glass plate with an adhesive or the like.

Further, the antenna conductor provided on the window glass plate is not limited to the AM and FM radio broadcasting bands, but can be applied to television VHF bands, television UHF bands, telephones, and the like.

In the present invention, the number of antenna conductors provided on an automobile is not limited, and the antenna between the glass antenna of the present invention and another antenna such as a pole antenna and / or another glass antenna may be provided. Diversity reception may be performed.

The glass antenna of the present invention may be provided on one side of a vehicle, for example, on a side window glass plate. But,
It is preferable to provide the antenna on both side window glass plates and perform diversity reception between both glass antennas in order to improve directivity.

In the present invention, the window glass plate on which the antenna conductor is provided is a side window glass plate due to its properties.
Particularly, a rear side window glass plate is most suitable. But,
It is not limited to the side window glass plate, and may be a rear window glass plate, a front window glass plate, a roof window glass plate, or the like.

In the present invention, the vehicle body opening means an opening in the vehicle body into which the window glass plate is to be fitted, which should be a vehicle body ground, and is made of a conductive material such as metal.

FIGS. 2 to 5 show different types of the present invention from the type shown in FIG.

[0040]

【Example】

Example 1 As an example, a glass antenna for a vehicle as shown in FIG. 1 was manufactured. The side window glass plate is the one on the left side of the car. The size of the side window glass plate is approximately 400 m in the vertical direction.
m, approximately 550 mm in the horizontal direction. First antenna conductor 3
, The conductor length of the second antenna conductor 5 is 1370 mm, the interval A is 105 mm, the intervals B, C,
D was 25 mm, M was 270 mm, L was 400 mm, and K was 15 mm.

The feeding point 4 was square, and its size was 15 mm × 15 mm. The length of the auxiliary antenna conductor 6 was 490 mm clockwise and 270 mm counterclockwise from the intersection with the connection conductor 6a. The distance between the antenna conductors was 15 mm. The reception characteristic of Example 1 is as shown in FIG.
It was measured at 0 MHz. The upper direction in FIG. 7 is the front direction of the vehicle, and the lower direction is the rear direction of the vehicle.

Example 2 As a comparative example, a vehicle glass antenna as shown in FIG. 9 was manufactured. Example 1 for side window glass
The same as was used. The conductor length of the first antenna conductor 3 is 1430 mm, and the conductor length of the second antenna conductor 5 is 13
70 mm, intervals A, B, C, and D are each 25 mm, interval M is 270 mm, interval L is 400 mm, and interval K is 15
mm.

The feeding point 4 was a square, and its size was 15 mm × 15 mm. The length of the auxiliary antenna conductor 6 was 490 mm clockwise and 270 mm counterclockwise from the intersection with the connection conductor 6a. The distance between the antenna conductors was 15 mm.

The reception characteristics of Example 2 are as shown in FIG.
Hz. The upper direction in FIG. 10 is the front direction of the vehicle, and the lower direction is the rear direction of the vehicle.

[0045]

According to the present invention, it is possible to obtain an omnidirectional glass antenna having much higher reception sensitivity than the conventional example. Also, for example, since the rear window glass plate of an RV car is narrow, even an automobile in which an antenna conductor can be provided in a small area can be provided in a small space, a sufficient field of view can be secured, and sufficient reception characteristics can be obtained. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a typical example of an automotive glass antenna according to the present invention.

FIG. 2 is a block diagram of a different type of the present invention from the type of FIG. 1;

FIG. 3 is a block diagram of a different type of the present invention from the type of FIG.

FIG. 4 is a block diagram of a different type of the present invention from the type of FIG. 1;

FIG. 5 is a block diagram of another type of the present invention different from the type of FIG. 1;

FIG. 6 is a configuration diagram of a conventional example.

FIG. 7 is a directional characteristic diagram of a horizontal polarization plane of Example 1.

FIG. 8 is a directional characteristic diagram of a horizontal polarization plane of the glass antenna for vehicle of FIG. 6 which is a conventional example.

FIG. 9 is a configuration diagram of a glass antenna device for an automobile of Example 2.

FIG. 10 is a directional characteristic diagram of a horizontal plane of polarization of Example 2.

[Explanation of symbols]

 1: vehicle body opening 2: side window glass plate at the rear of the car 3: first antenna conductor 4: feeding point 5: second antenna conductor 6: auxiliary antenna conductor 6a: connection conductor A, B, C, D, K, L, M: interval

Claims (4)

[Claims] 1. A vehicular glass antenna in which a feed point is provided on a window glass plate of a vehicle and an antenna conductor is provided to extend from the feed point substantially in parallel with a peripheral portion of the window glass plate. The antenna conductor is provided so as to extend over two or more sides of the window glass plate, and the maximum interval among the intervals between each side of the antenna conductor and each of the opposing body openings is the minimum interval. A glass antenna for vehicles, which is 1.5 times or more. 2. A plurality of antenna conductors, and a maximum interval among the intervals between each side of the outermost antenna conductor and each of the opposing vehicle body openings is at least 1.5 times the minimum interval. Item 2. A vehicle glass antenna according to Item 1. 3. An antenna conductor comprising a first antenna conductor and a second antenna conductor.
When viewed from either side of the window glass plate, the first antenna conductor having one end connected to the feeding point is extended in a clockwise direction from the feeding point as a starting point. The second antenna conductor having one end connected to the point is connected to the first antenna starting from the feeding point.
3. The glass antenna for a vehicle according to claim 1, wherein the glass antenna is extended counterclockwise so as to be surrounded by the antenna conductor. 4. A glass antenna for a vehicle according to claim 1, further comprising an auxiliary antenna conductor provided inside the antenna conductor.