JPH09153716A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extremely simple glass antenna which is provided at the upper space part of lead wire for heating, does not occupy a wide space and further can receive the radio waves of extremely wide band from FM radio broadcasting wave to TV broadcasting wave UHF band. SOLUTION: This antenna is provided with a 1st element 3 composed of a horizontal wire connected to a power feeding part provided at the central part of window glass at the upper space part of lead wire for heating and an L-shaped 2nd element 4 composed of vertical wire and horizontal wire connected to one part of element 3 at least. Then, a length (a) of horizontal wire extended from a lead-out point 31 of 1st element 3 to a power feeding part 5 toward one side part is set from 100mm to 150mm, a length (b) of horizontal wire extended from the lead-out point 3 toward the other side part is sent from 450mm to 600mm, and the total length adding a length (c) from the lead- out point 3 toward the vertical wire to a length (e) of horizontal wire of 2nd element 4 is set from 200mm to 300mm.

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 an automobile or the like for receiving TV broadcast waves and FM radio broadcast waves.

[0002]

2. Description of the Related Art Heretofore, as a glass antenna for a vehicle, an antenna provided on a rear window glass is generally adopted because if it is provided on a front window glass, it interferes with the visibility of a driver or the like. In recent years, not only FM radio broadcast waves but also T
V-broadcast waves are also being received by glass antennas, and many applications have been filed. The upper margin of the conductive wire for heating has the widest space in the rear window glass, and the part has a high reception gain. It is most practical because it is relatively easy to raise.

[0003]

However, the glass antenna provided in the upper margin of the conductive wire for heating can receive a very wide band from the FM radio broadcast wave to the TV broadcast wave UHF band as recently. When required, a very large number of filaments were used and the shape was inevitably complicated, and it was difficult to provide another glass antenna in the upper margin of the heating filament.

The present invention has been made in view of the above circumstances, and it is provided in the upper margin portion of the heating conductive wire, does not take up space, and furthermore, from FM radio broadcasting waves to TV broadcasting waves. It is an object of the present invention to provide a very simple glass antenna that can receive radio waves in a very wide band up to the UHF band.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is connected to a power feeding portion provided in a central portion of a window glass in an upper margin of a heating conductive wire of a rear window glass for a vehicle. A glass antenna for a vehicle, comprising at least a first element consisting of a horizontal filament and an L-shaped second element consisting of a vertical filament and a horizontal filament connected to a part of the element, The length of the horizontal filament extending from the point where the element is pulled out to the power feeding portion to one side is 100 mm suitable for receiving the TV broadcast wave UHF band.
The length of the horizontal line extending from the pull-out point to the other side portion is 150 mm, and the FM radio broadcast wave and TV broadcast wave receive VHF band 1 to 3 channel (hereinafter referred to as VHF-L band) radio waves. 450mm-600m suitable for
In addition to the length of m, the total length of the horizontal line length of the second element plus the length from the extraction point to the vertical line is 4 to 12 channels (hereinafter referred to as VHF) of the TV broadcast wave VHF band. It is characterized by having a length of 200 mm to 300 mm suitable for receiving radio waves in the (-H band), and the first element has a length of one horizontal line from the center of the window glass. The length may be about 100 mm to 150 mm, and only the second element, which is one horizontal filament, is added. Since this length does not exceed the horizontal length of the first element, It suffices to occupy only one half of the upper margin of the heating conductive wire.

Further, one of the horizontal stripes of the first element has a length suitable for receiving the TV broadcast wave UHF band,
The length of the other horizontal line is a length suitable for receiving TV broadcast wave VHF-L band radio waves and FM radio broadcast waves, and the length of the horizontal line of the second element is from the extraction point to the vertical line. The total length including the length is TV broadcast wave VHF-
Since the length is suitable for receiving the radio wave in the H band, the radio wave in a very wide band from the FM radio broadcast wave to the TV broadcast wave UHF band can be received despite the simple configuration.

Further, it extends vertically from a part of the conductive wire for heating and further extends horizontally to 450 mm which is suitable for receiving the FM radio broadcast wave of the first element and the TV broadcast wave of the VHF-L band. If a third element capacitively coupled to the horizontal filament having a length of 600 mm is added, the space for the heating conductive filament does not affect one half of the upper margin portion of the heating filament at all and the TV broadcasting is performed. Wave VHF-L
It is possible to improve the reception gain of the band and FM radio broadcast wave.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The first antenna comprises a horizontal filament connected to a power feeding portion provided in the center of a window glass, and a length of the horizontal filament extending from a lead-out point to the power feeding portion to one side portion. Is 100 mm to 150 mm, and the length of the horizontal filament extending from the pull-out point to the other side is 450 mm.
~ 600mm, window glass size (width)
When the length is small, the tip of the horizontal filament may be folded back as shown in Example 5 so as to have a length of 450 mm to 600 mm. Further, it is aesthetically preferable that both the pulling-out point of the first element to the power feeding portion and the power feeding portion are provided on the center line CL of the window glass as shown in the examples described later, but it is deviated by about 100 mm from side to side. Does not matter.

The length of the vertical filament of the second element has almost no effect on the reception gain, but the distance between the horizontal filament of this element and the first element, and the distance between the uppermost conductive filament for heating. In consideration of the above, the range of 10 mm to 50 mm is set, and the intersection point of the vertical filament and the first element is set to a range of about 0 to 100 mm from the drawing point to the power feeding part, and the total length of this and the length is 200 mm to 300 mm The length of the horizontal filament may be determined so as to be within the range.

The third element may be omitted, but it is better to provide it because the reception gain becomes high, and the extraction point is not limited to the extraction from the bus bars on both sides of the heating conductive wire, but the heating of the uppermost part is also possible. It may be pulled out from the conductive wire itself.

The antenna of the present invention is most preferably a printed strip formed by printing and firing a conductive paste such as silver paste, but when attaching laminated glass to the rear window glass, two sheet glasses are used. Of course, a wire strip formed by embedding a metal thin wire such as a copper wire in the intermediate film to be bonded may be used.

Although the antenna of the present invention can be used alone, as shown in Examples 2 and 3, another antenna provided on the rear window glass, and further an antenna provided on the front window glass, Diversity reception is preferably performed in combination with an antenna provided on the side window glass, a pole antenna such as a whip antenna, or the like.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 5 show Examples 1 to 5 in which the glass antenna of the present invention was provided on a rear window glass for an automobile, respectively.
FIG.

Embodiment 1 As shown in FIG. 1, a conductive wire for heating 2, 2, ... Is provided on the inside surface of a glass sheet 1 mounted on a rear window glass for a vehicle.
With ... 2, the length extending in the one of the side portions from the drawer point 3 ₁ in the feeding portion of the first element (= a) is 12
A first element 3 consisting of a horizontal strip of 0 mm and a horizontal strip of 500 mm in length (= b) extending from the pull-out point 3 ₁ to the other side portion, and connected to the horizontal strip of this element 3 (vertical line from the pull-out point) (Length to strip c = 100mm)
And a horizontal line with a length (= e) of 150 mm and a length (=
d) The antenna of the present invention having the L-shaped second element 4 consisting of a vertical wire of 40 mm, the feeding portion 5, and the lead wire 5 ₁ is formed by printing and firing a conductive paste. The total length (c + d) obtained by adding the length c of the horizontal line of the second element to the length c from the extraction point to the vertical line is 250 mm.

The plate glass thus obtained is mounted on the rear window glass of an automobile, and an FM radio broadcast wave of 76 MHz to 90 MHz,
TV broadcast wave VHF band (VHF-L in 3 channels)
Band) 4-12 channel TV broadcast wave VHF band (VHF-H band), TV broadcast wave UHF band, when the reception gain of the standard dipole antenna is set to 0 dB, the gain difference (hereinafter, dipole ratio). Abbreviated as
On average, -17.7 dB, -17.9 dB, -1 respectively.
5.8 dB and -16.2 dB, and the average reception gain of a good glass antenna is about -18 dB and -1 respectively.
Since it is 8 dB, about -18 dB, and about -18 dB, it can be seen that it is a good antenna.

Example 2 As shown in FIG. 2, a glass antenna of Example 1 extends vertically from a part of a heating conductive wire (strictly speaking, a bus bar),
Further extending horizontally by 400 mm, the first element 3 4
It is a horizontal wire having a length of 50 mm to 600 mm, to which a third element 6 which is capacitively coupled (a distance of 30 mm from the first element) is added, and further another antenna 7 for receiving a TV broadcast wave, heating. TV broadcast wave VHF-H branch line to improve the reception gain of the heating conductive filament relative band 2 ', TV broadcast wave of another antenna 7 when the antenna 2 ₁ Yoshirubeden filament as a power supply unit A branch line 7'for improving the reception gain in the VHF-H band is added.

The plate glass thus obtained is attached to the rear window glass of an automobile, and the antenna of the present invention is used to generate FM radio broadcast waves, TV broadcast waves VHF-L band, TV.
By receiving the broadcast wave VHF-H band and the TV broadcast wave UHF band,
Expressing each reception gain as a dipole ratio, on average −
16.8 dB, -16.4 dB, -15.6 dB, -1
The value is 6.1 dB, and the reception gain in the FM radio broadcast wave and TV broadcast wave VHF-L band is particularly improved as compared with the first embodiment.

In this embodiment, the TV broadcast wave VHF-L is actually used.
When receiving the band and FM radio broadcast wave, the VHF is used by the antenna 3 of the present invention and a whip antenna (not shown).
When receiving -H band and TV broadcast wave UHF band, the antenna of the present invention, heat conductive filament as the antenna (feeding portion 2 _1), by another antenna 7, respectively diversity reception.

Embodiment 3 As shown in FIG. 3, the second element 4 of the antenna of the present invention is arranged so that the connection position of the vertical filaments is changed and the horizontal filaments are arranged to the left side. Another antenna 8 for receiving TV broadcast waves is provided in the upper margin of the conductive wire, and another antenna 9 for receiving TV broadcast waves is provided in the lower margin of the heating conductive wire.
10 is provided.

In this embodiment, when the FM radio broadcast wave is actually received, the antenna of the present invention and the whip antenna (not shown) are used, and when the TV broadcast wave VHF-L band is received, the antenna 8 different from the antenna of the present invention is used. Due to
When receiving the VHF-H band and the UHF band, diversity reception is performed by the antenna of the present invention, another antenna 8, another antenna 9, and another antenna 10.

Example 4, Example 5 In Example 4 shown in FIG. 4, the second element has two L-shaped horizontal filaments, and the third element 6 is capacitively coupled to the first element 3. It is a thing.

The fifth embodiment shown in FIG. 5 is the first element 3
Is folded back, the connection point of the vertical line of the second element 4 is set as the pull-out point 3 ₁ on CL, and the third element 6 is capacitively coupled to the first element 3.
The folded portion at the tip of the first element is effective when the size of the rear window glass is small.

[0023]

As described above, the glass antenna of the present invention is provided in the upper margin of the heating conductive wire, takes up less space than conventional antennas, and can be used to prevent FM radio broadcast waves. It is possible to receive radio waves in a very wide band up to the TV broadcast wave UHF band.

[Brief description of the drawings]

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Flat glass 2 Conductive wire for heating 3 _1st element 3 ₁ Extraction point 4 2nd element 5 Feed part 6 3rd element 7-10 Another antenna

Claims (2)

[Claims] 1. A first element composed of a horizontal filament connected to a power feeding portion provided in a central portion of the window glass in an upper margin of a heating conductive filament of a rear window glass for a vehicle and a part of the element are connected. In a glass antenna for a vehicle having at least an L-shaped second element composed of a vertical filament and a horizontal filament, a horizontal filament extending from a lead-out point of the first element to a power feeding portion to one side portion. Length of 10
The length of the horizontal filament extending from the pull-out point to the other side is 450 mm to 600 m.
For a vehicle characterized by having a length of m and a total length of 200 mm to 300 mm obtained by adding the length from the drawing point to the vertical line to the length of the horizontal line of the second element. Glass antenna. 2. The heating element wire extends vertically from a part thereof and further horizontally and extends from 450 mm to 60 mm of the first element.
The glass antenna for a vehicle according to claim 1, wherein a third element that is capacitively coupled is added to a horizontal filament having a length of 0 mm.