JPH09321520A - Vehicle use glass antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain performance equal or better than that of a conventional antenna by providing an antenna conductor and an earth conductor nearly in parallel and setting a width of the earth conductor to a specific range without the use of a FM amplifier with a simple conductor pattern even when a space occupied by the antenna conductor is small. SOLUTION: An antenna conductor 2, a feed point 2a, an earth conductor 3 and an earth point 3a are provided to a window glass 1. A phase adjustment element 8 is provided as required. The antenna conductor 2 and the earth conductor 3 are arranged nearly in parallel and a radio wave signal is received efficiently by providing a simple pattern onto a window glass pane. Since the earth point 3a is used to connect to an outer conductor of a coaxial cable, it is not required to connect the outer conductor of the coaxial cable to a vehicle body in the vicinity of the glass antenna. The shape of the antenna conductor 2 may be usually almost a straight line, a curve or a V shape or the like, and the width L3 of the earth conductor 31 is preferably set to usually 0.2 to 10mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle glass antenna in which an antenna conductor and a ground conductor are provided on a side window glass of a vehicle, a rear window glass, and the like.
The present invention relates to a glass antenna for a vehicle, which is suitable for receiving television broadcasting.

[0002]

2. Description of the Related Art A glass antenna provided on a window glass of an automobile for receiving broadcast shown in FIG. 9 has been conventionally known. In FIG. 9, an antenna conductor 92 is provided on the side window glass plate 1 of the automobile. The antenna conductor 92 is a conductor pattern that is manufactured by printing a conductive metal-containing paste such as a conductive silver paste on the inside surface of a side window glass plate of an automobile and baking it to form the antenna conductor 92. To use as.

In this prior art example, the signal received by the antenna conductor 92 is transmitted from the feeding point 92a to the coaxial cable 94 by F
It is transmitted to an M amplifier (not shown). The FM amplifier amplifies the received signal and transmits it to a receiver (not shown) through the coaxial cable 94. The antenna conductor 92 functions not only as an FM broadcast antenna but also as an AM broadcast antenna.

[0004]

The glass antenna shown in FIG. 9 has a low receiving sensitivity in a high frequency band such as an FM broadcast band,
FM for amplifying received signal between feeding point and receiver
There was a problem that productivity was poor because an amplifier had to be provided.

Further, the glass antenna shown in FIG. 9 has a very complicated conductor pattern of the antenna conductor 92, and the function of each element constituting this conductor pattern has not been clarified clearly, and is necessary. It took a long time to adjust the conductor pattern to obtain good reception sensitivity.

In the glass antenna shown in FIG. 9, the conductor pattern of the antenna conductor 92 forms a very complicated pattern, which increases the probability of obstructing the field of view. In particular, even a window glass plate having a small area or a large window glass plate, like a rear window glass plate, is usually a window glass plate provided with an electrically heated defogger and a margin portion for providing an antenna conductor is provided. This tendency becomes more pronounced in narrow window panes.

In the case of the conventional example shown in FIG. 9,
In an automobile in which a hinge is directly provided on the window glass plate, or a hinge is provided on a window frame provided at the periphery of the window glass plate, and the window glass plate itself can be freely opened and closed separately from the door, When the antenna conductor 92 is provided on the window glass plate, the inner conductor of the coaxial cable connecting the feeding point 92a of the antenna conductor 92 and the receiver is provided on the window glass plate separately from the outer conductor of the coaxial cable. It had to be extended to the feeding point 92a. In this case, in order to improve the mechanical strength of the inner conductor of the coaxial cable to withstand use by opening and closing the window glass plate,
Although the inner conductor of the coaxial cable is wound into a coil, the result is that the S / N ratio is deteriorated and the reception characteristics are deteriorated.

An object of the present invention is to provide a window glass plate which has a performance equivalent to or better than that of the prior art without using an FM amplifier in a simple conductor pattern and has a narrow area in which an antenna conductor can be provided. Therefore, even if the space occupied by the antenna conductor is small, it is possible to provide a glass antenna for a vehicle which can secure the performance equal to or higher than that of the conventional example with a simple conductor pattern without using an FM amplifier.

[0009]

In order to solve the above problems, the present invention provides an antenna conductor provided on a window glass plate of a vehicle, a substantially band-shaped ground conductor, a feeding point provided on the antenna conductor, and a ground conductor. And a ground point provided on the antenna conductor, the antenna conductor and the ground conductor are substantially parallel to each other, and the width of the ground conductor is in the range of 0.2 to 10 mm.

Further, according to the present invention, an antenna conductor provided on a window glass plate of a vehicle, a substantially elliptical shape, a substantially circular shape, a substantially triangular shape,
It is composed of a substantially square or substantially V-shaped ground conductor, a feeding point provided on the antenna conductor, and a ground point provided on the ground conductor, and most of the antenna conductor and the ground conductor are substantially parallel. A glass antenna for a vehicle is provided.

The present invention also provides the above glass antenna for a vehicle, wherein the distance between the antenna conductor and the ground conductor is in the range of 1 to 300 mm.

[0012]

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

In FIG. 1, 1 is a side window glass plate of a vehicle, 2 is an antenna conductor, 3 is a ground conductor, 2a is a feeding point for connecting the antenna conductor 2 and an internal conductor of a coaxial cable (not shown), 3a is a ground point for connecting the ground conductor 3 to the outer conductor of the coaxial cable, 4 is a vehicle body opening, 8 is a phase adjusting element, and L ₁ is an antenna conductor 2
, L ₂ is the length of the phase adjusting element 8 in the substantially horizontal direction, L ₃ is the length of the ground conductor 3 in the substantially vertical direction (width), L ₄
Is the substantially horizontal length of the ground conductor 3, d ₁ is the distance between the antenna conductor 2 and the ground conductor 3, d ₂ is the substantially vertical length of the phase adjusting element 8, and d ₃ is the phase adjusting element 8 The distance d ₄ between the ground conductors 3 is the shortest distance between the antenna conductor 2 and the vehicle body opening 4.

Although not shown, the coaxial cable is a coaxial cable connecting the feeding point 2a and the receiver. Further, in the drawings other than FIG. 1, the names of the same reference numerals and parts as in FIG. 1 are the same as those in FIG.

In the present invention, the antenna conductor 2 and the feeding point 2
a, the ground conductor 3 and the ground point 3a are provided on the window glass plate 1. The phase adjusting element 8 is provided as needed, and usually need not be provided.

Further, as shown in FIG. 1, the antenna conductor 2 and the ground conductor 3 are arranged substantially in parallel, and by providing a simple pattern on the window glass plate, the radio signal can be efficiently received.

Further, since the earth conductor 3 has the earth point 3a, the outer conductor of the coaxial cable can be connected to the earth point 3a. Therefore, it is necessary to connect the outer conductor of the coaxial cable to the vehicle body near the glass antenna. Absent. For this reason,
Since the inner conductor of the coaxial cable is always integrated with the outer conductor of the coaxial cable, when it is mounted, the inner conductor alone does not have to be routed around, and reception characteristics are unlikely to deteriorate. The feeding point 2a is preferably provided in the vicinity of the ground point 3a, and the distance between them is preferably within 50 mm, 30 m
Within m is more preferable.

The shape of the ground conductor 3 makes it easy to keep the distance d ₁ between the antenna conductor 2 and the ground conductor 3 constant, and improves the reception characteristics or adjusts the reception characteristics.
In order to facilitate the determination of the pattern of the ground conductor 3, a substantially strip shape is preferable. However, it is not limited to this, and the ground conductor 3
The shape may be a substantially elliptical shape, a substantially circular shape, a substantially triangular shape such as a right triangle, a substantially square shape, a substantially polygonal shape, or a substantially V shape. When the antenna conductor 2 and the ground conductor 3 are provided at the corners of the window glass plate, the ground conductor 3 may preferably have a substantially elliptical shape, a substantially circular shape, a substantially right-angled triangle, or the like. The ground conductor 3 and the ground point 3a may be integrated.

The shape of the antenna conductor 2 may be generally linear, curved, or V-shaped, and the line width of the antenna conductor 2 is usually in the range of 0.2 to 5 mm. Is preferred.

It is necessary that the antenna conductor 2 and the ground conductor 3 are substantially parallel to each other with a predetermined gap. However, it is preferable that most of the antenna conductor 2 and the ground conductor 3 are substantially parallel to each other, and even if there is a portion that is not substantially parallel to both, it can be used.

The distance d ₁ between the antenna conductor 2 and the ground conductor 3
Is preferably in the range of 3 to 100 mm. When it is within this range, the reception sensitivity in the high frequency band such as FM broadcasting band is usually 2 dB as compared with the case where it is outside this range.
Improve more than a degree.

A more preferable range of the distance d ₁ is 10
The range is up to 70 mm, and if within this range,
As compared with the case where the frequency is out of this range, the reception sensitivity in the high frequency band such as the FM broadcast band is usually improved by about 1.5 dB or more.

The shortest distance d ₄ between the antenna conductor 2 and the vehicle body opening 4 is preferably in the range of 5 to 300 mm. When it is within this range, the receiving sensitivity in the high frequency band such as the FM broadcast band is usually improved by about 0.5 dB or more as compared with the case where it is outside this range. Furthermore, more preferable range of the shortest distance d ₄ is in the range of 10 to 200 mm, if it is within this range, the reception sensitivity of the high frequency band of FM broadcast band or the like as compared with the case outside this range are usually 1.0 dB
Improve more than a degree.

Regarding the positions of the antenna conductor 2 and the ground conductor 3, it is preferable that the ground conductor 3 is disposed between the vehicle body opening 4 and the antenna conductor 2, and the vehicle body opening 4 and the antenna conductor 2 are preferably arranged. In the case where the ground conductor 3 is arranged between the antenna conductor 2 and the ground conductor 3, it is compared with the case where the antenna conductor 2 is arranged between the vehicle body opening 4 and the ground conductor 3.
The reception sensitivity in the high frequency band such as the M broadcasting band is usually improved by about 1.0 dB or more. Here, the vehicle body opening 4 is an opening of the vehicle body into which the window glass plate is to be fitted and which should serve as a vehicle body ground, and is made of a conductive material such as metal.

The length L ₁ of the antenna conductor 2 is a vehicle body when the wavelength of the desired reception center frequency is λ, the glass shortening rate is K, the maximum reception frequency wavelength is λ _H , and the reception minimum frequency wavelength is λ _L. In consideration of the influence of 1 and the influence of the glass shape, it is preferably (λ _H · K / 8) to λ _L · K. Within this range, the receiving sensitivity in the high frequency band such as the FM broadcast band is usually improved by about 2 dB or more as compared with the case outside this range. The glass shortening rate K is usually 0.64. A more preferable range of the length L ₁ of the antenna conductor 2 is (λ _H · K / 4) to (λ _L · K / 2).

Similarly, the length L ₂ of the ground conductor 3 is preferably (λ _H · K / 20) to (λ _L · K / 2). Within this range, the reception sensitivity in the high frequency band such as the FM broadcast band is usually higher than that in the case outside this range.
It is improved by about 1.0 dB or more.

In the present invention, the antenna conductor 2 may be provided with the phase adjusting element 8. The phase adjusting element 8 shown in FIG. 1 has a substantially T-shape, but is not limited to this, and may have a substantially L-shape, a substantially linear shape, a curved shape, or the like.

The length (width) L ₃ of the ground conductor 3 in the substantially vertical direction is preferably in the range of 0.5 to 10 mm. Within this range, the reception sensitivity in the high frequency band such as the FM broadcast band is usually higher than that in the case outside this range.
It is improved by about 1.0 dB or more.

A more preferable range of the length (width) L ₃ is 0.2 to ₃ mm. Within this range,
As compared with the case where the frequency is out of this range, the reception sensitivity in the high frequency band such as the FM broadcasting band is usually improved by about 0.5 dB or more.

Further, in FIG. 1, the feeding point 2a and the grounding point 3a.
Is provided at the upper right of the side window glass 1, but it is not limited to this location, and may be provided at any position on the window glass plate, for example, at the upper and lower peripheral portions of the left and right center of the window glass plate. It may be installed.

Further, the glass antenna of the present invention is AM,
Not limited to FM radio broadcasting band, but for TV VHF band,
It can be applied to TV UHF band, telephone, etc., and the number of antenna conductors and ground conductors provided on the window glass plate is not limited.

Further, in the present invention, the window glass plate provided with the antenna conductor is not limited to the side window glass plate,
It may be a rear window glass plate, a front window glass plate, a roof window glass plate, or the like.

2 to 8 show a glass antenna of the present invention of a type different from that of FIG. 5 and 8, 1
2 is a second antenna conductor, 12a is a second feeding point, 13
Is a second ground conductor and 13a is a second ground point.
Further, in FIG. 6, 22 is a second antenna conductor, 22
a is the second feeding point. Further, in FIG. 7, 32 is a second antenna conductor and 32a is a second feeding point.

Further, as shown in FIGS. 6 and 7, a plurality of antenna conductors may be provided for one ground conductor. Further, FIG. 10 shows an example in which the antenna conductor and the ground conductor are substantially V-shaped.

Although not particularly shown, a typical example in which the present invention is applied to a rear window glass plate will be described. In this case, the present invention can be applied even if the rear window glass plate is not provided with an electrically heated defogger having a heater wire and a bus bar for supplying power to the heater wire, but in the case where the rear window glass plate is provided with the defogger. Will be described.

The defogger is provided over the entire rear window glass plate, and a space (a blank portion) for providing a conductor pattern is left on the upper portion of the rear window glass plate, separately from the defogger. . Two bus bars are provided on both sides of the rear window glass plate in a substantially V shape,
Several heater wires that connect the two bus bars are provided in the rear window glass plate, for example, horizontally.

The antenna conductor is provided in the upper margin of the rear window glass plate. Further, the antenna conductor can be used even if it is not so close as to be capacitively coupled with the defogger, but it is preferable to be so close as to be capacitively coupled with the defogger for improving the receiving sensitivity. In order to bring the antenna conductor close enough to be capacitively coupled to the defogger, the antenna conductor is usually brought close to the uppermost heater wire forming the defogger. The capacitive coupling between the antenna conductor and the defogger is usually the distance between the antenna conductor and the defogger
Capacitive coupling is made in the range of 0.1 to 50 mm.

The antenna conductor is provided on the rear window glass plate so as to extend in a substantially horizontal direction. The feeding point of the antenna conductor and the ground point of the ground conductor are provided at the left end of the upper margin of the rear window glass plate. There is. Also, the ground conductor is
It is arranged between the opening of the vehicle body above the rear window glass plate and the antenna conductor 2.

When the antenna conductor and the defogger are capacitively coupled, at least one of a choke coil and a high frequency choke coil is provided on at least one of the anode of the DC power supply for the defogger and the bus bar and the cathode of the DC power supply for the defogger. Connecting.

Further, a choke coil and a high frequency choke coil are inserted between the bus bar and the DC power source for the defogger,
By increasing the impedance of the choke coil and the high frequency choke coil in the high frequency band, it is preferable to ensure that the direct current from the DC power source to the defogger is passed but the current in the high frequency band such as the broadcast frequency band is cut off.

In this way, the choke coil and the high frequency choke coil can insulate the heater wire of the defogger and the bus bar from the vehicle body ground in a high frequency manner, and receive the high frequency band such as the radio broadcasting frequency band induced in the heater wire and the bus bar. The current can be prevented from flowing to the vehicle body ground, and this received current can be sent to the receiver without leakage.

Further, when only the medium wave band, for example, the AM broadcast band is received, the high frequency choke coil is usually unnecessary, and only the choke coil is required, and only the FM broadcast band is received. Therefore, only the high frequency choke coil is required. Further, even in the case of receiving both the medium wave band and the FM broadcast band, if there is a coil satisfying the functions of both the choke coil and the high frequency choke coil, only such a coil is required.

Further, in a typical example in which the present invention is applied to a rear window glass plate, the antenna conductor, the feeding point of the antenna conductor, the ground conductor and the ground point of the ground conductor may be provided at any part of the rear window glass plate. Well, it is not limited to the above description.

Although the defogger described above is a so-called C-shaped defogger, of the busbars on both sides of the defogger, the busbar on the right side is divided into two parts up and down from a desired position, and the lower side busbar and the upper part are arranged. Part bus bar is provided, the lead wire of the vehicle body ground is connected to the lower side bus bar, the lead wire on the power supply side is connected to the upper side bus bar, and the fed current is passed from the upper side bus bar through the left side bus bar. It flows in a U shape to the side bus bar. Even such a so-called substantially U-shaped defogger can be used in the present invention.

Regarding the position of the rear window glass plate provided with the antenna conductor, the above description has been given of the example in which the antenna conductor is provided in the margin above the defogger of the rear window glass plate, but the present invention is not limited to this. Alternatively, it may be a margin below the defogger of the rear window glass plate. Further, they may be provided on the upper and lower portions of the defogger respectively, or may be provided on other blank portions. In other words, the antenna conductor may be provided anywhere in the margins above, below, to the left and right of the defogger of the rear window glass plate, and the number of antenna conductors and ground conductors provided on the rear window glass plate is not limited.

The antenna conductor, the ground conductor, the heater wire and the bus bar are usually formed by printing a conductive metal-containing paste such as a conductive silver paste on the inside surface of the window glass plate 1 and baking it. Although it is manufactured, the method is not limited to such a forming method, and a conductive linear body or a foil-like body such as a copper wire may be formed on the inside or outside surface of the window glass plate 1. It may be provided inside. At least one of the antenna conductor, the ground conductor, the heater wire and the bus bar.
One may be a transparent conductive material.

Further, in the present invention, the number of antenna conductors and ground conductors provided in the vehicle is not limited, and the glass antennas of the present invention, the glass antenna of the present invention, and other pole antennas and the like. Antenna and /
Alternatively, diversity reception may be performed with another glass antenna.

[0048]

EXAMPLES Examples 1 to 4 will be described below as examples.

Example 1 A glass antenna as shown in FIG. 1 was manufactured. The size of the side window glass 1 is 40 in the upper lateral direction.
0 mm, lower horizontal direction 500 mm, vertical direction 350 mm
And

The length L ₁ of the antenna conductor 2 is 250
mm, the substantially horizontal length L ₄ of the ground conductor 3 is 350 m
m, the length L ₃ of the ground conductor 3 in the substantially vertical direction (width) is 2.0
mm, the distance d ₁ between the antenna conductor 2 and the ground conductor 3 is 50
mm, the line width of the antenna conductor 2 is 0.8 mm, the shortest distance d ₄ between the antenna conductor 2 and the vehicle body opening ₄ is 20 mm, the feeding point 2a has a dimension of 18 mm × 18 mm, and the ground point 3a has a dimension of 18 mm × 18 mm. , Feeding point 2a and ground point 3a
The shortest distance between and was 20 mm. Further, the phase adjusting element 8 was not provided.

On the other hand, a glass antenna having a shape as shown in FIG. 9 which has been conventionally used is set as Comparative Example 1. The size of the side window glass 1 is the same as in Example 1, and the length of the feeding point 92a and the lower right end of the entire antenna conductor 92 is 1000 mm.

The average reception sensitivities in these VHF band 170 to 220 MHz frequency bands were compared. Regarding vertical polarization and horizontal polarization, Example 1 is about 1.
An improvement of 0 dBμV was observed.

Example 2 A glass antenna as shown in FIG. 2 was manufactured. The side window glass 1 had the same shape as that of Example 1. In addition, the length of the antenna conductor 2 is 600 mm, the length of the ground conductor 3 in the substantially lateral direction is 500 mm, the width of the ground conductor 3 is 2.0 mm, the distance between the antenna conductor 2 and the ground conductor 3 is 30 mm, and the length of the antenna conductor 2 is 30 mm. Line width is 1.0m
m, the shortest distance between the antenna conductor 2 and the vehicle body opening is 50 m
m, the dimension of the feeding point 2a was 18 mm × 18 mm, the dimension of the grounding point 3a was 18 mm × 18 mm, and the shortest distance between the feeding point 2a and the grounding point 3a was 20 mm. Further, the phase adjusting element 8 was not provided.

On the other hand, a glass antenna having a shape as shown in FIG. 9 which has been conventionally used is set as Comparative Example 2. The size of the side window glass 1 is the same as in Example 1, and the lengths of the feeding point 92a and the lower right end of the entire antenna conductor 92 are set to 1300 mm because they are used for the FM broadcasting band.

The average receiving sensitivities in the frequency bands of these FM broadcasting bands 76 to 108 MHz were compared. In the case of vertical polarization and horizontal polarization, Example 1 is about 2.
An improvement of 0 dBμV was observed.

Example 3 The glass antenna of the present invention was provided on a rear window glass plate of an automobile, which is provided with a defogger. The defogger is of a so-called C-shaped type having two bus bars. The number of heater wires of the defogger is 14 and the distance between the heater wires is 30 m.
m.

Both the antenna conductor and the ground conductor are provided in the upper margin of the rear window glass plate, both of which are linear,
The antenna conductor was provided so as to extend in a substantially horizontal direction, the antenna conductor was provided on the defogger side located in the center of the rear window glass plate, and the ground conductor was provided on the vehicle body opening side above the rear window glass plate. The feeding point of the antenna conductor and the grounding point of the grounding conductor were provided at the left end of the upper margin of the rear window glass plate.

In order to capacitively couple the antenna conductor with the defogger, the antenna conductor was placed close to the uppermost heater wire extending in the substantially horizontal direction, and the distance between the antenna conductor and the uppermost heater wire was set to 10 mm.

The length of the antenna conductor is 350 mm,
The length of the ground conductor is 50 mm, and the distance between them is 70 m.
m, the width of the ground conductor is 2.0 mm, the line width of the antenna conductor is 1.0 mm, the shortest distance between the antenna conductor and the vehicle body opening (upper part of the rear window glass plate) is 100 mm, and the feeding point 2a
Has a size of 18 mm x 18 mm, and the ground point 3a has a size of 1
8 mm × 18 mm, and the shortest distance between the feeding point 2a and the ground point 3a was 20 mm.

A choke coil and a high frequency choke coil were connected in series between the bus bar on one side and the anode of the DC power source for the defogger, and between the remaining bus bar and the cathode of the DC power source for the defogger.

The average receiving sensitivity in the frequency band of these VHF bands 170 to 220 MHz was measured. As a result, in the case of vertically polarized waves and horizontally polarized waves, Example 3 was able to be satisfactorily received with the same reception sensitivity (within ± about 1 dB) as that of the pole antenna without the FM amplifier.

(Example 4) A hinge is directly provided on the rear window glass plate, and the rear window glass plate itself can be freely opened and closed separately from the rear door. It was The defogger is of a so-called C-shaped type having two bus bars. The number of heater wires in the defogger is 10 and the distance between the heater wires is 30 mm.
And

Both the antenna conductor and the ground conductor are provided in the upper margin of the rear window glass plate, both of which are linear,
The antenna conductor was provided so as to extend in a substantially horizontal direction, the antenna conductor was provided on the defogger side located in the center of the rear window glass plate, and the ground conductor was provided on the vehicle body opening side above the rear window glass plate. The feeding point of the antenna conductor and the grounding point of the grounding conductor were provided at the left end of the upper margin of the rear window glass plate.

In order to capacitively couple the antenna conductor with the defogger, the antenna conductor was brought close to the uppermost heater wire extending substantially horizontally, and the distance between the antenna conductor and the uppermost heater wire was set to 10 mm.

The length of the antenna conductor is 200 mm,
The length of the ground conductor is 250 mm, and the distance between them is 30 mm.
mm, the width of the ground conductor is 2.0 mm, the line width of the antenna conductor is 1.0 mm, the shortest distance between the antenna conductor and the vehicle body opening (upper part of the rear window glass plate) is 100 mm, and the feeding point 2
The dimension of a was 18 mm × 18 mm, the dimension of the ground point 3 a was 18 mm × 18 mm, and the shortest distance between the feeding point 2 a and the ground point 3 a was 20 mm.

A choke coil and a high-frequency choke coil were connected in series between the bus bar on one side and the anode of the DC power source for the defogger, and between the remaining bus bar and the cathode of the DC power source for the defogger.

The average receiving sensitivities in these VHF band 170 to 220 MHz frequency bands were compared between Example 3 and Example 4. In the vertically polarized wave and the horizontally polarized wave, the receiving sensitivity of Example 4 was almost equal to that of Example 3.

[0068]

According to the present invention, since the antenna conductor and the ground conductor are under predetermined conditions, the reception sensitivity in the high frequency band such as the FM broadcasting band is high and the received signal is received between the feeding point and the receiver. Since it is not necessary to provide an FM amplifier for amplification, productivity is good.

In the present invention, by connecting the outer conductor of the coaxial cable to the ground conductor, it is not necessary to connect the outer conductor of the coaxial cable to the vehicle body that can be the vehicle body ground, and the window glass plate itself is separate from the rear door. In an automobile or the like that can be freely opened and closed, the outer conductor and the inner conductor of the coaxial cable are not separated on the window glass plate and can be routed as an integral body, so that the reception characteristics due to mounting are less likely to be impaired.

Further, the vehicle glass antenna of the present invention is
Since it is composed of a simple conductor pattern, it does not take a long time to adjust the conductor pattern in order to obtain the required receiving sensitivity, and the productivity is good. In addition, it is possible to improve the reception sensitivity in both vertical and horizontal polarization planes.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a glass antenna of the present invention of a type different from that of FIG.

FIG. 3 is a configuration diagram of a glass antenna of the present invention of a type different from that of FIG.

FIG. 4 is a block diagram of a glass antenna of the present invention of a type different from that of FIG.

FIG. 5 is a block diagram of a glass antenna of the present invention of a type different from that of FIG.

FIG. 6 is a block diagram of a glass antenna of the present invention of a type different from that of FIG.

FIG. 7 is a structural diagram of a glass antenna of the present invention of a type different from that of FIG.

FIG. 8 is a structural diagram of a glass antenna of the present invention of a type different from that of FIG.

FIG. 9 is a configuration diagram of a conventional example of a glass antenna for a vehicle.

FIG. 10 is a block diagram of a glass antenna of the present invention of a type different from that of FIG.

[Explanation of symbols]

1: vehicle side window glass sheet 2: Antenna conductor 3: Ground conductor 2a: feeding point 3a: Ground point 4: the body opening 8: phase regulating element L _1: length of the antenna conductor 2 L _2: for phase adjustment Length of element 8 in substantially horizontal direction L ₃ : Length of ground conductor 3 in substantially vertical direction (width) L ₄ : Length of ground conductor 3 in substantially horizontal direction d ₁ : Distance between antenna conductor 2 and ground conductor 3 d ₂ : The length of the phase adjusting element 8 in the substantially vertical direction d ₃ : The distance between the phase adjusting element 8 and the ground conductor 3 d ₄ : The shortest distance between the antenna conductor 2 and the vehicle body opening 4.

Claims (3)

[Claims] 1. An antenna conductor provided on a window glass plate of a vehicle, a substantially band-shaped ground conductor, a feeding point provided on the antenna conductor, and a ground point provided on the ground conductor.
A glass antenna for a vehicle, wherein the antenna conductor and the ground conductor are substantially parallel to each other, and the width of the ground conductor is in the range of 0.2 to 10 mm. 2. An antenna conductor provided on a window glass plate of a vehicle, a ground conductor having a substantially elliptical shape, a substantially circular shape, a substantially triangular shape, a substantially square shape, or a substantially V shape, and a feeding point provided at the antenna conductor. And a grounding point provided on the grounding conductor, wherein the antenna conductor and the grounding conductor are mostly parallel to each other. 3. The distance between the antenna conductor and the ground conductor is 1 to
The glass antenna for vehicles according to claim 1 or 2, which has a range of 300 mm.