JP3413339B2 - Glass antenna for vehicles - Google Patents

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 side window glass for a vehicle such as an automobile, and more particularly to an F antenna.
The present invention relates to a glass antenna suitable for receiving radio waves having different frequency bands such as M radio broadcast waves and TV broadcast waves.

[0002]

2. Description of the Related Art Conventionally, as a glass antenna for a vehicle, an antenna provided with a conductive wire strip in an upper margin portion or a lower margin portion of a heating conductive wire strip of a rear window glass and a conductive wire strip in a front window glass. The antenna provided is known and has been put to practical use, but in the former case, since the space is originally small and there is a risk of obstructing the field of view, the area occupied by the antenna will be small, and sufficient reception is not always possible. No gain was obtained.

Further, the latter antenna provided on the front window glass has a relatively high reception gain, but has a restriction on the mounting place more than the rear window glass so as not to hinder the driver's view.
Therefore, antennas provided on the side window glass are attracting attention due to the widespread use of RV vehicles, etc., in which such a restriction is scarce and the side window glass having a relatively large area is installed. A pair of antennas are installed on the window glass to perform diversity reception.
No. 61-265904, in which two systems of antennas are provided on at least one side window glass and one is arranged clockwise and the other is arranged counterclockwise. No. 61-197710, which is provided with an antenna wire extending in the vertical direction from the power feeding section, and No. 61, which is provided with two systems of antennas over substantially the entire side window glass.
A number of applications have been filed such as No. 197712.

[0004]

However, in Japanese Utility Model Laid-Open No. 58-61509, the antennas on the left and right side window glasses are used for diversity reception.
76MHz because it is received by the system antenna
FM radio broadcast wave band of up to 90 MHz, TV broadcast wave band of 1 to 3 channels (hereinafter abbreviated as VHF-L band), 4
It is difficult to receive a very wide range of radio waves in the TV broadcast wave band of 12 channels (hereinafter referred to as VHF-H band).

Further, Japanese Patent Laid-Open Nos. 61-265904, 61-197710 and 61-197712 show two systems of antennas for receiving TV broadcast waves. One of the antennas on the bottom is only one side,
Since both antennas extend along at most two sides, it is generally difficult to obtain a sufficient reception gain, let alone FM radio broadcast wave to TV broadcast wave VHF.
It was difficult to obtain high reception gain over the entire band.

The present invention has been made in view of the above circumstances, and even with a single system antenna, the antenna having a high reception gain for FM radio broadcast waves and the reception gain for TV broadcast waves are provided. An object is to provide a high glass antenna for an automobile.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first horizontal filament extending from an upper power feeding portion of a side windowpane for a vehicle along an upper side of the windowpane and the horizontal line. A first vertical line that is connected to the strip and extends along the side opposite to the power supply portion, and a second horizontal line that is connected to the vertical line and extends along the lower side of the window glass are mainly configured. A first horizontal line extending from the power supply unit in the same direction as the first horizontal line or extending in parallel to the first horizontal line; or a slight extension from the power supply unit to the side opposite to the first horizontal line and folding back to extend in parallel with the first horizontal line. 3 horizontal lines and at least a 2nd vertical line connected to this horizontal line and extending in parallel with a 1st vertical line , 1st horizontal line, 1st vertical line, and 2nd water
The total length of the flat wire is about α times the wavelength λ of the received radio wave (α:
The shortening rate of the antenna is about 0.7)
The total of the third horizontal line, the second vertical line, and the horizontal line
It is characterized in that the length is in the range of about α / 2 times the wavelength λ .

The total length of the first horizontal filaments, the first vertical filaments, and the second horizontal filaments, which are the main constituent features, is set in the range of 1800 mm to 2600 mm, and the third horizontal filaments and the second horizontal filaments are formed. The total length of the vertical filaments is 800 mm
〜1400mm range is 76MHz〜
Λα or λ when the wavelength of the received radio wave is λ and the shortening rate of the antenna is α (approximately 0.7) for the received radio wave of FM radio broadcast waves from Japan to North America at 108 MHz.
This is preferable because the resonance length becomes α / 2 and the reception gain becomes high.

Further, when the first horizontal line and the third horizontal line are arranged close to each other and in parallel, the two elements connected to each other are capacitively coupled to each other so that the receiving gain is improved. preferable.

The antenna of the present invention can be used alone, but when diversity reception is performed with a pole antenna such as a glass antenna or a whip antenna provided on the other side window glass, rear window glass or front window glass. More preferable.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The power feeding portion of the present invention includes a power feeding portion arranged at a position from an upper corner of a side window glass to a central portion of a side edge of the window glass.

The first horizontal filament, the first vertical filament and the second horizontal filament are formed by at least one continuous filament.
It is preferable that they are provided along the upper side, the side side, and the lower side of the window glass, respectively, and the total length thereof is about α times the wavelength λ of the received radio wave.

The third horizontal filament may be arranged in parallel with the lower portion or the upper portion of the first horizontal filament, and may extend directly from the power feeding portion in the same direction as the first horizontal filament.
If you extend it slightly to the side opposite to the horizontal line, and then fold it back so that it extends parallel to the first horizontal line, this folded part can adjust the phase or impedance. Is preferred.

Further, the third horizontal line and the second vertical line are formed by continuous lines and are provided along the upper side and the side, respectively, and the total length is (α) of the wavelength λ of the received radio wave. /
2) It is preferable to make it about twice.

Further, it is preferable that the distance between the third horizontal filament and the first horizontal filament is in the range of 5 mm to 20 mm. Although the auxiliary element is not always necessary, a linear or L-shaped, U-shaped, T-shaped element or the like is provided at the tip of the second horizontal filament, the tip of the second vertical filament, or other portion. Depending on the vehicle model, it is very effective to add or connect to improve gain, improve directional characteristics, and adjust impedance.

[0016]

1 to 4 show Embodiments 1 to 1 of the present invention, respectively.
FIG. 5 is a front view of the glass antenna of Example 4 as viewed from the inside of a vehicle provided on a side window glass, and FIG. 5 is a frequency characteristic diagram of Example 1.

Example 1 Example 1 shown in FIG. 1 is an example in which the third horizontal filament extends from the power feeding portion in parallel with the first horizontal filament.

The plate glass 1 mounted as one side window glass has a first horizontal filament 3 ₁ having a length of 820 mm extending from the power feeding portion 2 provided at the upper corner portion along the upper edge of the window glass and the horizontal line. Article extending along a first vertical strip 3 ₂ and the hanging is connected to the linear Article 3 ₂ glazing lower length extending along the sides opposite to 380mm and 3 are connected to the _first feeding section 2 The second horizontal filament 3 ₃ having a length of 1000 mm is mainly configured, and the _third horizontal filament 3 having a length of 800 mm extending from the power feeding section 2 in parallel with the first horizontal filament 3.
₄ and horizontal streaks 3 ₄ connected to the first vertical strip 3 ₂ glass antenna 3 before bending the silver paste of the present invention that the length extending in parallel made of the second vertical strip ₃₅ of 190mm By screen printing, and bending and firing at the same time.

The dimensions of the plate glass 1 thus obtained are as follows: upper edge length = 1060 mm, lower edge length = 1.
200 mm, side long side edge length = 500 mm, side short side edge length = 480 mm, mounted on a side window glass of an automobile, and the antenna 3 of the present invention was used.
6 MHz to 90 MHz FM radio broadcasting wave band in Japan, 88 MHz to 108 MHz FM radio broadcasting wave band in Europe and the United States, 90 MHz to 108 MHz VHF-L band,
170MHz-222MHz VHF-H band, 470M
Hz to 770 MHz TV broadcast wave UHF band (hereinafter referred to as UH
When receiving a radio wave in the F band) and expressing the reception gain of a standard dipole antenna as 0 dB (hereinafter, abbreviated as dipole ratio), the antenna 3 has an average value of −19. .1 dB, -20.0 dB,-
22.1 dB and -19.6 dB, the reception gain is high for any FM radio broadcast wave, and the reception gain is sufficient to be used as a sub-antenna for diversity reception even in the TV broadcast wave band. Was obtained.

Further, a high reception gain was obtained even in the TV broadcast wave band UHF band. In addition, 76MHz ~ 108MH
The frequency characteristic diagram of z in the FM radio broadcasting wave band in both the domestic and European regions is shown in FIG. 5, and it can be seen that the gain is stable and high in all bands.

Example 2 In Example 2 shown in FIG. 2, the third horizontal filament is slightly extended from the feeding portion to the side opposite to the first horizontal filament and is folded back.
It is configured to extend parallel to the first horizontal filament, and an auxiliary element is connected to and added to the tip of the second horizontal filament,
This is an example in which an auxiliary element is connected and added to the tip of the second vertical filament.

A first horizontal filament 3 ₁ having a length of 820 mm extending from the power feeding portion 2 along the upper side of the window glass and the horizontal filament 3 ₁
Connected to the first vertical line 3 ₂ having a length of 380 mm and extending along the side opposite to the power supply unit 2 and the length connected to the vertical line 3 ₂ and extending along the lower side of the window glass. 1000m
The second horizontal filament 3 ₃ of m is the main structure, and
An auxiliary element 3 ₆ consisting of a short vertical filament connected to the tip of the second horizontal filament 3 _{3 and} a horizontal filament having a folded length of 960 mm is added, and further, from the power feeding part 2 to the first horizontal filament. extending 60mm on a side, folded, first horizontal strip 3 ₁ 3 length of 900mm extending in parallel to the horizontal strip 3 ₄ and horizontal streak 3 are connected ₄ to the first vertical strip 3
_{The second} vertical filament 3 ₅ having a length of 350 mm extending parallel to 2
And the auxiliary element 3 ₇ consisting of a short horizontal filament connected to the vertical filament 3 ₅ and a vertical filament having a length of 340 mm.

The antenna 3 thus obtained has a structure of 7
The reception gain for the FM radio broadcast wave band of 6 MHz to 90 MHz in Japan and the FM radio broadcast wave band of 88 MHz to 108 MHz in Europe and the United States is -18.4 as a dipole ratio.
dB, -19.4 dB, which is higher than that of Example 1, and is 90 V to 108 MHz VHF-L band, 17
0MHz to 222MHz VHF-H band, 470MHz
It was confirmed that the same reception gain as that of the first embodiment can be obtained even in the TV broadcast wave UHF band of up to 770 MHz.

Example 3 In Example 3 shown in FIG. 3, the third horizontal filament is slightly extended from the feeding portion to the side opposite to the first horizontal filament, and is folded back.
This is an example in which the structure extends parallel to the first horizontal line, and a T-shaped auxiliary element is connected to and added to substantially the center of the second horizontal line, and an auxiliary element extending vertically from the folded portion is added.

A first horizontal filament 3 ₁ having a length of 820 mm extending from the feeding portion 2 along the upper side of the window glass and the horizontal filament 3 ₁
Connected to the first vertical line 3 ₂ having a length of 380 mm and extending along the side opposite to the power supply unit 2 and the length connected to the vertical line 3 ₂ and extending along the lower side of the window glass. 1000m
The second horizontal filament 3 ₃ of m is the main structure, and
A T-shaped auxiliary element 38 consisting of a short vertical filament connected to almost the central part of the second horizontal filament 3 _{3 and} a horizontal filament having a length of 1000 mm is added, and the feeding section 2 is connected to the first horizontal filament 3 3. ₁ extending 60mm on the opposite side of the folded first vertical strip length extending parallel first and horizontal strip 3 ₁ is connected to the third horizontal strip 3 ₄ and horizontal streaks 3 ₄ 900mm In addition to the configuration of the second vertical filaments 3 ₅ having a length of 350 mm extending in parallel with 3 ₂ and the auxiliary element 3 ₉ having a length of 290 mm extending vertically from the folded portion, Example 1 was used. It has the same configuration.

The antenna 3 thus obtained has F
M radio broadcasting wave band, VHF-L band, VHF-H band, UH
It was confirmed that even in the F band, a reception gain almost equal to that in the second embodiment can be obtained.

Example 4 In Example 4 shown in FIG. 4, a third horizontal filament extends slightly from the feeding portion to the side opposite to the first horizontal filament and is folded back to make the upper portion of the first horizontal filament parallel. This is an example in which an auxiliary element connected to the tip end portion of the second horizontal filament and extending vertically is connected and added as an extended configuration.

A first horizontal filament 3 ₁ having a length of 820 mm extending from the power feeding portion 2 along the upper side of the window glass and the horizontal filament 3 ₁
Connected to the first vertical line 3 ₂ having a length of 380 mm and extending along the side opposite to the power supply unit 2 and the length connected to the vertical line 3 ₂ and extending along the lower side of the window glass. 1000m
The second horizontal filament 3 ₃ of m is the main structure, and
60 mm from the power feeding part 2 to the side opposite to the first horizontal filament 3 _1.
Extending the length of the first horizontal strip 3 ₁ a length extending parallel folding extend parallel to the horizontal strip 3 ₄ and horizontal streak 3 are connected ₄ to the first vertical strip 3 ₂ third of 900mm Is 35
A structure consisting of the second vertical strip ₃₅ of 0 mm, further the second horizontal strip 3 ₃ is the connected to the tip portion connecting the length auxiliary element 3 ₁₀ 290mm vertically extending, except with the addition Example The configuration is the same as that of 1.

The antenna 3 thus obtained has F
M radio broadcasting wave band, VHF-L band, VHF-H band, UH
It was confirmed that even in the F band, a reception gain almost equal to that in the second embodiment can be obtained.

[0030]

As described above, the glass antenna of the present invention is an antenna provided on a side window glass, and although it is an antenna of one system, it improves the reception gain especially for FM radio broadcast waves, It is intended to obtain a practical level of reception gain even for broadcast waves.

[Brief description of drawings]

FIG. 1 is a front view of a glass antenna according to a first embodiment of the present invention as viewed from the inside of a vehicle provided on a side window glass.

FIG. 2 is a front view of a glass antenna according to a second embodiment of the present invention as viewed from the inside of a vehicle provided on a side window glass.

FIG. 3 is a front view of a glass antenna according to a third embodiment of the present invention as viewed from the inside of a vehicle provided on a side window glass.

FIG. 4 is a front view of a glass antenna according to a fourth embodiment of the present invention provided on a side window glass when viewed from the inside of the vehicle.

5 is a frequency characteristic diagram of the glass antenna of the present invention in Embodiment 1. FIG.

[Explanation of symbols]

1 Plate Glass 2 Feeding Part 3 ₁ First Horizontal Wire 3 ₂ First Vertical Wire 3 ₃ Second Horizontal Wire 3 ₄ Third Horizontal Wire 3 ₅ Second Vertical Wire 3 _{6 to} 3 ₁₀ Auxiliary Element 3 Glass antenna of the present invention

Claims (5)

(57) [Claims] 1. A first horizontal line extending from an upper power feeding portion of a side window glass for a vehicle along an upper side of the window glass and a first horizontal line connected to the horizontal line and extending along a side edge opposite to the power feeding portion. 1
And a second horizontal filament that is connected to the vertical filament and extends along the lower side of the window glass,
Wherein the third horizontal strip and the horizontal is connected to the striatum first vertical strip and a second vertical strip extending in parallel from a feeding portion extending parallel to the first horizontal strip at least includes, a first horizontal
Accepts the total length of the filament, the first vertical filament, and the second horizontal filament.
About α times the wavelength λ of the radio wave (α: antenna shortening rate,
The range is 0.7) and the third horizontal line and
The total length of the two vertical and horizontal filaments is α / 2 times the wavelength λ.
A glass antenna for a vehicle, which has a front and rear range . 2. A first horizontal filament extending from an upper power feeding portion of a side window glass for a vehicle along an upper side of the window glass, and a first horizontal line connected to the horizontal filament and extending along a side edge opposite to the power feeding portion. 1
And a second horizontal filament that is connected to the vertical filament and extends along the lower side of the window glass,
A third horizontal filament extending slightly from the power feeding portion to the side opposite to the first horizontal filament, folded back, and extending parallel to the first horizontal filament, and a first vertical wire connected to the third horizontal filament. At least a second vertical line extending parallel to the line,
Total of 1 horizontal line, 1st vertical line and 2nd horizontal line
The length is around α times the wavelength λ of the received radio wave (α: short antenna
Reduction ratio, approximately 0.7) and the third horizontal
The total length of the filament, the second vertical filament, and the horizontal filament is
A glass antenna for a vehicle, which has a range of approximately α / 2 . 3. The total length of the first horizontal filament, the first vertical filament and the second horizontal filament is in the range of 1800 mm to 2600 mm, and the third horizontal filament and the second vertical filament. The glass antenna for vehicle according to claim 1 or 2, wherein the total length of the horizontal filaments is in the range of 800 mm to 1400 mm. 4. The glass antenna for a vehicle according to claim 1, wherein the distance between the first horizontal filament and the third horizontal filament is in the range of 5 mm to 20 mm. 5. The glass antenna for a vehicle according to claim 1, wherein the glass antenna is provided for diversity reception with a glass antenna or a whip antenna provided on another window glass.