JPH05335825A - Glass antenna for vehicle - Google Patents

Abstract

PURPOSE:To attain a reception at a high gain for a broad frequency band from an FM radio broadcast band till a TV broadcast wave UHF band by providing ingenious combination of 1st and 2nd elements to a lower space of defrosting heater wires. CONSTITUTION:Elements 4, 5 and a feeding pint 6 are screen-printed and fired with a conductive paste on a plate glass 1 toward the inside of the cabin of a vehicle. The element 4 consists of a defrosting heater wire 2, a bus bar 3 and horizontal wires. The element 5 is prolonged horizontally from one side toward the middle of the window glass, and reflected almost in the middle in the opposite direction to the element 4 and prolonged horizontally toward the one side, its tip is reflected in the opposite direction to the element 4 and prolonged horizontally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass antenna provided on a rear window glass of a vehicle such as an automobile, and more particularly to a glass antenna suitable for receiving TV broadcast waves and FM radio broadcast waves.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a glass antenna for a vehicle for receiving TV broadcast waves other than radio broadcast waves such as AM and FM, and a vertical antenna is provided on a front window glass. What is provided (Japanese Patent Laid-Open No. 61-203702),
Various proposals have been made, such as one in which an antenna for receiving FM radio broadcast waves and TV broadcast waves is provided in the upper margin of the anti-fogging heating wire of the rear window glass (Japanese Patent Laid-Open No. 61-121603). Since a plurality of heating filaments occupies most of the area of glass, the area occupied by the antenna is small, and sufficient reception gain cannot be obtained.

The present invention has been made in view of the above point, and by utilizing the lower blank portion of the heating wire, a rear window glass having a small antenna occupying area can be provided.
An object of the present invention is to provide a glass antenna for a vehicle which can improve the reception gain in a very wide frequency band from FM radio broadcast wave to TV broadcast wave UHF band and can be used also as an antenna for keyless entry.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a vehicle glass antenna provided in a lower margin portion of a heating wire for anti-fog of a rear window glass for a vehicle, in which a feeding point provided on one side portion is used. A first element mainly composed of a horizontal filament connected to the first element, and a first element below or above the first element, extending horizontally from the feeding point toward a central portion of the window glass, and substantially at the central portion of the first element. It folds back to the side opposite to the element, extends horizontally toward one side, and further folds its tip toward the side opposite to the first element, and from this part horizontally by one or two horizontal lines. It is characterized in that it is provided with a second element which is extended and has one end opened when one is provided and closed when two is provided.

[0005]

In the vehicle glass antenna provided in the lower margin of the anti-fogging heating wire of the vehicle rear window glass, the vehicle glass antenna is located below or above the first element and extends from the feeding point toward the center of the window glass. It extends horizontally and folds back to the side opposite to the first element at approximately the center and extends horizontally toward one side, and its tip is further folded back to the side opposite to the first element. The second element, which extends horizontally with one or two horizontal filaments and has one end open and one end closed, extends from the FM radio broadcast wave to the TV broadcast wave UHF. Although the receiving gain is high over a wide band up to the band and acts as a main antenna, since there is a band with a low receiving gain by itself, the first element acts as an auxiliary element that supplements this part. , T results from the FM radio broadcast wave
It can be received at a practical level over a wide band of V broadcast wave UHF band.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. 1 to 6 show Examples 1 to 6 in which the glass antenna of the present invention is provided on a rear window glass for an automobile.
FIG.

Embodiment 1, Embodiment 2 Both Embodiment 1 shown in FIG. 1 and Embodiment 2 shown in FIG.
This is an example in which the single-pane glass is attached to the rear window glass of an automobile with the configuration shown in claim 1.

In the first embodiment, as shown in FIG. 1, on the inner side of the glass sheet 1, there are first heating lines 2, 2, ... Element 4, horizontally extending from one side portion toward the central portion of the window glass, folded back to the side opposite to the first element at substantially the central portion, and horizontally extending toward one side portion, The tip portion is further folded back to the side opposite to the first element, and the second element 5 and the feeding point 6 extending horizontally are formed by screen printing and firing with a conductive paste.

The dimensions of each part of the vehicle glass antenna thus obtained are A ₁ = 1120 mm, A ₂ = 142
0 mm, B = 690 mm, C = 160 mm, D = 25 m
m, E = 550 mm, F = 40 mm, G = 450 mm,
H = 10 mm, I = 110 mm, J = 5 mm, K = 80
76 MHz to 108 MHz F depending on mm
M radio broadcasting wave, TV broadcasting wave VHF band low channel in 1 to 3 channels (hereinafter, TV broadcasting wave VHF-L
TV broadcast wave VHF in 4 to 12 channels High channel (hereinafter, TV broadcast wave VHF-)
It is expressed as a gain difference (hereinafter abbreviated as a dipole ratio) when the reception gain of a TV broadcast wave UHF band of 470 MHz to 770 MHz is measured and the reception gain of a standard dipole antenna is set to 0 dB. , -17.2 dB, -16.9 dB, and -18.3 d in average value, respectively.
B, -18.1 dB, and the reception gain of a good vehicle glass antenna conventionally used for practical use is about an average value for FM radio broadcast wave, TV broadcast wave VHF band, and TV broadcast wave UHF band, respectively. -20 dB, about -20 dB, about-
Since it is 20 dB, about -18 dB, FM radio broadcast wave, TV broadcast wave exceeds VHF band, and TV broadcast wave UHF
It can be seen that the antenna is the same in the band and is a good antenna.

In the second embodiment shown in FIG. 2, H = 20 mm, K
= 70 mm and 220 mm long auxiliary element 7
The configuration and dimensions are the same as those of the first embodiment except that the above is added.

The reception gain (dipole ratio) of the FM radio broadcast wave, the TV broadcast wave VHF-L band, the TV broadcast wave VHF-H band, and the TV broadcast wave UHF band was measured by such a glass antenna for a vehicle. -1 on average
6.5 dB, -16.2 dB, -18.9 dB, -1
It was 7.8 dB, which was a better result than that of Example 1.

Third Embodiment, Fourth Embodiment Both the third embodiment shown in FIG. 3 and the fourth embodiment shown in FIG. 4 are examples having the structure shown in claim 2.

In the third embodiment shown in FIG. 3, the length of the first element 4 is C = 180 mm, the tip of the second element 5 is a loop, and H ₁ = 10 mm, H ₂ = 10 mm, I =
The structure and dimensions are the same as those of the first embodiment except that 400 mm and K = 70 mm.

The reception gain (dipole ratio) of the FM radio broadcast wave, the TV broadcast wave VHF-L band, the TV broadcast wave VHF-H band, and the TV broadcast wave UHF band was measured by the glass antenna for vehicle as described above. -1 on average
7.6 dB, -17.5 dB, -17.7 dB, -1
It was 8.9 dB, and the same result as in Example 1 was obtained.

Example 4 shown in FIG. 4 has a length of 150 mm.
The structure and dimensions are the same as those of the third embodiment except that the auxiliary element 8 is added. With such a glass antenna for a vehicle, FM radio broadcast waves and TV broadcast waves VHF-
When the reception gain (dipole ratio) of the L band, the TV broadcast wave VHF-H band, and the TV broadcast wave UHF band was measured, the average values were -17.0 dB, -16.8 dB, and -17.3, respectively.
dB and -18.8 dB were obtained, and the same results as in Example 1 were obtained.

Embodiment 5 Embodiment 5 shown in FIG. 5 is an embodiment in which the first element 4 and the second element 5 are turned upside down and the construction shown in claim 3 is obtained, and C = 180mm, D = 30mm,
E = 600 mm, F = 40 mm, G = 550 mm, H =
20mm, I = 180mm, J = 10mm, K = 80m
m, and has the same configuration and dimensions as in Example 1 except that the auxiliary element 9 having a length of 150 mm is added.

The reception gain (dipole ratio) of the FM radio broadcast wave, the TV broadcast wave VHF-L band, the TV broadcast wave VHF-H band, and the TV broadcast wave UHF band was measured by such a glass antenna for a vehicle. The result almost equal to that of Example 1 was obtained.

Embodiment 6 Embodiment 6 shown in FIG. 6 is an embodiment in which the first element 4 and the second element 5 are turned upside down and the construction shown in claim 4 is obtained. 30mm, F = 40mm, H
₁ = 10 mm, H ₂ = 10 mm, I = 400 mm,
70 mm long auxiliary element 10, 100 mm long
The structure and dimensions are the same as those of the fifth embodiment except that the auxiliary element 11 is added.

The reception gain (dipole ratio) of the FM radio broadcast wave, the TV broadcast wave VHF-L band, the TV broadcast wave VHF-H band, and the TV broadcast wave UHF band was measured by such a glass antenna for a vehicle. The result almost equal to that of Example 1 was obtained.

Although the preferred embodiments have been described above, the present invention is not limited to these, and various applications are possible. For the first element, the length C is 50
˜500 mm, preferably 100-200 mm.

Regarding the second element, the length E of the horizontal filament extending horizontally from the feeding point toward the central portion of the window glass is in the range of 350 to 750 mm, and is folded back to the side opposite to the first element at approximately the central portion. The length G of the horizontal filament extending horizontally toward one side portion is in the range of 250 to E (mm), and the tip of the horizontal filament is folded back to the side opposite to the first element and extends horizontally. The length I is 50 to 200 mm in the case of one horizontal filament and 250 to G (mm) in the case of closing the ends of the two horizontal filaments to form a loop shape.
The respective ranges are preferred.

The distance D between the first element and the second element is in the range of 15 to 35 mm, and the horizontal line extending from the feeding point toward the center of the window glass and the horizontal line extending back to one side part. The distance F is preferably in the range of 20 to 90 mm.

The auxiliary element is not necessarily required, but for the purpose of improving directional characteristics, receiving gain, impedance matching, etc., various shapes such as a U-shape and a T-shape other than a linear shape and an L-shape. Element can be added.

Further, although the antenna of the present invention can be used alone, another glass antenna provided in the upper margin of the heating wire, another glass antenna provided on the front or side window glass, or a pole antenna It is more preferable to add diversity reception to perform diversity reception.

Further, when laminated glass is used for the rear window glass, the glass antenna may be formed by embedding a thin metal wire such as a copper wire in an intermediate film such as polyvinyl butyral.

[0026]

EFFECTS OF THE INVENTION The glass antenna of the present invention is provided with a clever combination of the first and second elements in the lower margin of the anti-fogging heating wire, so that the FM radio can be used in a rear window glass having a small antenna occupying area. In a very wide frequency band from broadcast wave to TV broadcast wave UHF band,
Some can receive with high gain.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment in which a glass antenna of the present invention is provided on a rear window glass for an automobile.

FIG. 2 is a front view showing a second embodiment in which the glass antenna of the present invention is provided on a rear window glass for an automobile.

FIG. 3 is a front view showing a third embodiment in which the glass antenna of the present invention is provided on a rear window glass for an automobile.

FIG. 4 is a front view showing a fourth embodiment in which the glass antenna of the present invention is provided on a rear window glass for an automobile.

FIG. 5 is a front view showing a fifth embodiment in which the glass antenna of the present invention is provided on a rear window glass for an automobile.

FIG. 6 is a front view showing a sixth embodiment in which the glass antenna of the present invention is provided on a rear window glass for an automobile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat glass 2 Heating wire for anti-fog 4 First element 5 Second element 6 Feeding point 7-11 Auxiliary element

Claims (4)

[Claims] 1. A glass antenna for a vehicle, which is provided in a lower margin portion of a heating wire for anti-fogging of a rear window glass for a vehicle, mainly comprises a horizontal filament connected to a feeding point provided on one side portion. And a first element that extends horizontally from the feeding point to the center of the window glass below the first element, and is folded back to the side opposite to the first element at substantially the center. A glass antenna for a vehicle, comprising a second element that horizontally extends toward a side portion and further has a tip end portion that is folded back to the side opposite to the first element and horizontally extends. 2. A vehicle glass antenna provided in a lower margin of an anti-fogging heating wire of a rear window glass for a vehicle, wherein a horizontal wire connected to a feeding point provided in one side part is mainly constituted. And a first element that extends horizontally from the feeding point to the center of the window glass below the first element, and is folded back to the side opposite to the first element at substantially the center. The second element is extended horizontally toward the side portion, and the tip portion is further folded back to the side opposite to the first element, and from this portion, there is provided a second element which is horizontally extended by two horizontal filaments and whose tip is closed. A glass antenna for a vehicle characterized by the above. 3. A glass antenna for a vehicle, which is provided in a lower margin of a heating wire for anti-fogging of a rear window glass for a vehicle, mainly comprising a horizontal wire connected to a feeding point provided on one side portion. And a first element above the first element, extending horizontally from the feeding point toward the central portion of the window glass, and is folded back to the side opposite to the first element at substantially the central portion on one side. A glass antenna for a vehicle, comprising a second element that horizontally extends toward a side portion and further has a tip portion that is folded back to the side opposite to the first element and extends horizontally. 4. A glass antenna for a vehicle, which is provided in a lower margin of an anti-fogging heating wire of a rear window glass for a vehicle, mainly comprises a horizontal wire connected to a feeding point provided on one side. And a first element above the first element, extending horizontally from the feeding point toward the central portion of the window glass, and is folded back to the side opposite to the first element at substantially the central portion on one side. The second element is extended horizontally toward the side portion, and the tip portion is further folded back to the side opposite to the first element, and from this portion, there is provided a second element which is horizontally extended by two horizontal filaments and whose tip is closed. A glass antenna for a vehicle characterized by the above.