JPH06224612A - Glass antenna for vehicle - Google Patents

Abstract

PURPOSE:To provide a side window glass antenna able to receive not only a radio wave of VHF/UHF bands of a TV broadcast wave but also an FM radio broadcast wave. CONSTITUTION:The antenna is provided with a loop shaped major element 3 formed by connecting both ends of plural horizontal wires with vertical wires and with an auxiliary element 4 extended from any corner of the major element 3 in parallel to one side edge and an upper side edge and extended at least to other side edges in parallel downward in which feeding is applied to the tip of the auxiliary element 4 and the interval between one side of the major element 3 and the wire extended in parallel with the side edge of the auxiliary element 4 is selected to be 10mm or below, or with a loop shaped major element formed by connecting both ends of plural horizontal wires with vertical wires and with an auxiliary element 4 extended from any corner of the major element to one side edge and the lower side edge in parallel and extended at least to the other side edge in parallel upward.

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 of a vehicle such as an automobile, and more particularly to a glass antenna suitable for receiving a wide range of radio waves from FM radio broadcast waves to TV broadcast waves.

[0002]

2. Description of the Related Art Conventionally, as a glass antenna for a vehicle, an antenna provided in a space above a heating wire for anti-fog on a rear window glass, a transparent conductive film or a wire antenna provided on a front window glass. Antennas, etc. are known and some have been put to practical use, but in the former case, since there is originally a small space and there is a risk of obstructing the field of view, the occupying area becomes small and a sufficient reception gain is not always obtained. I couldn't get it.

Further, the latter antenna provided on the front window glass has a relatively high reception gain, but there is a restriction on the installation place more than the rear window glass so as not to hinder the driver's view.
Also in this case, sufficient reception gain was not always obtained.

Therefore, an antenna in which an antenna is provided on a side window glass having almost no such restrictions is disclosed in Japanese Patent Laid-Open No. 61-61.
It has been proposed as 275903. However, at present, an antenna having a high medical examination gain over a wide band from the TV broadcast wave VHF band to the UHF band has hardly been put into practical use.

The present invention has been made in view of the above circumstances, and provides a side window glass antenna capable of receiving not only radio waves from the VHF band to the UHF band of TV broadcast waves but also FM radio broadcast waves. The purpose is to

[0006]

DISCLOSURE OF THE INVENTION The present invention is an antenna provided on a side window glass for a vehicle, wherein a loop-shaped main element in which both ends of a plurality of horizontal filaments are connected by vertical filaments and the main element An auxiliary element extending from any corner of the element in parallel with one side edge or upper edge and further downwards in parallel with at least the other side edge is provided. Lines extending parallel to one side of the element and the other side edge of the auxiliary element are arranged in parallel, and the interval is 10 mm or less, or both ends of a plurality of horizontal lines are connected by vertical lines. The loop-shaped main element extends from one of the corners of the main element in parallel with one side edge or the lower side edge, and further extends upward at least in parallel with the other side edge. An auxiliary element is provided, power is supplied at the tip of the auxiliary element, and a line extending parallel to one side edge of the main element and the other side edge of the auxiliary element is arranged in parallel, and the distance between them is 10 mm or less. It is characterized by doing.

[0007]

When receiving a TV broadcast wave VHF band, UHF band or FM radio broadcast wave, a loop-shaped element in which the ends of two horizontal filaments are connected by a vertical filament acts as the main element, and the loop-shaped element A line extending parallel to the three or four edges of the window glass, particularly a horizontal line extending parallel to the upper or lower edge, acts as an auxiliary element for further increasing the reception gain. Furthermore, by arranging a part of the auxiliary element, a part of this filament and one side of the loop-shaped element in parallel, and by making the distance close to 10 mm or less, capacitive coupling is achieved in this part and a small area is formed. It is provided to improve the reception gain by apparently increasing the effective length of the antenna, which is originally short of the resonance length. 1 to 3 channels of the wave VHF band,
The effect is great when receiving FM radio broadcast waves.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view of a vehicle equipped with the glass antenna of the present invention, and FIGS. 2 to 7 are front views of essential parts of the glass antenna of the present invention, showing Examples 1 to 6, respectively.

Example 1 A single plate glass is used as a recreational vehicle (RV vehicle).
This is an example of mounting as a side window glass 2 called a rear quarter of a type automobile 1, and as shown in FIGS. 1 and 2, a loop-shaped main element in which ends of two horizontal filaments are connected by vertical filaments. An antenna composed of 3 and an auxiliary element 4 extending from a corner of the main element (upper right corner in this embodiment) to one side edge and an upper side edge and further downward to a lower side in parallel to the other side edge. 5 and the feeding point 6 are formed by screen printing and firing with a conductive paste.

The dimensions of each part of the glass antenna for a vehicle thus obtained are A ₁ = 430 mm, A ₂ = 500 m
m, B = 470 mm, C ₁ = 415 mm, C ₂ = 425
mm, D = 80 mm, E ₁ = 80 mm, E ₂ = 405 m
m, E ₃ = 430 mm, F = 5 mm, G = 30 mm, H
= 76 MHz to 108 MH depending on what is set to 15 mm
FM radio broadcasting wave of z, TV in 1 to 3 channels
Broadcast wave VHF band (abbreviated as VHF-L), TV broadcast wave in 4 to 12 channels VHF band (abbreviated as VHF-H), 470 MHz to 770 MHz TV broadcast wave UHF
When the reception gain of the band is measured and each average value is shown as a gain difference (hereinafter, abbreviated as dipole ratio) when the reception gain of the standard dipole antenna is 0 dB, it is -18.7 dB,-, respectively. 18.9 dB. -13.4d
B, -17.6 dB, and the reception gain of a good glass antenna for vehicles that has been put to practical use in the past is FM radio broadcast wave, TV broadcast wave VHF-L band, VHF band-H band, TV.
Approximately -20d on average for each broadcast wave UHF band
B, about -20 dB, about -20 dB, and about -18 dB, which are superior in all bands, indicating that the antenna is a good antenna.

Example 2 In Example 2 shown in FIG. 3, the main element 3 is connected to both ends of three horizontal filaments by vertical filaments to form two loops, and C ₁ = 415 mm, C ₂ = 420 mm, C ₃ = 43
0 mm, D ₁ = 65 mm, D ₂ = 65 mm, the auxiliary element 4 is extended from the other side edge further parallel to the lower side edge, and E ₁ = 65 mm, E ₃ = 470 mm, E
₄ = 440 mm and the same configuration and dimensions as in Example 1 except that another auxiliary element 7 having a length of 140 mm was 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. -18.1d
B, -18.2 dB. -17.7 dB, -17.9 dB
Then, the same results as in Example 1 were obtained.

Third Embodiment A third embodiment shown in FIG. 4 is an example in which the left and right are arranged opposite to the first embodiment, and the antenna 5 is arranged from the corner of the loop-shaped main element 3 (upper left corner in this embodiment). Another auxiliary element 8 having a length of 50 mm and another auxiliary element 8 having a length of 50 mm is formed, the auxiliary element 4 extending parallel to the one side edge and the upper side edge and further extending to the lower side parallel to the other side edge. The structure and dimensions are the same as those of the first embodiment except that the auxiliary element 9 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 the glass antenna for vehicle as described above. -18.0d
B, -16.5 dB. -13.2 dB, -18.0 dB
And the same results as in Example 1 were obtained.

Embodiment 4 to Embodiment 6 Embodiment 4 shown in FIG. 5 is an example in which the antenna 5 is arranged in the reverse of the embodiment 1, and the antenna 5 has a corner of the loop-shaped main element 3 (in this embodiment, the upper left corner). Example 1 except that an auxiliary element 4 extending in parallel from one side edge, an upper side edge, the other side edge and further extending in parallel to a lower side edge is added, and another auxiliary element 10 is added. In the fifth embodiment shown in FIG. 6, the main element 3 is connected to both end portions of three horizontal filaments by vertical filaments, and a loop-shaped corner (lower left corner in this embodiment) is used. From one side edge, extending parallel to the lower edge and further extending parallel to the other side edge to the upper side, the same configuration as in Example 1 except that another auxiliary element 11 is added, Dimensions and figures In the sixth embodiment shown in FIG. 7, the main element 3 is formed by two horizontal filaments and vertical filaments connecting both ends, and the antenna is arranged in the left-right direction opposite to the antenna of the fifth embodiment, and another auxiliary element 12 is provided. Example 1 except that the second antenna 13 is additionally provided in the upper half of the window glass, and the second antenna 13 is provided in the blank portion of the lower half.
The same configuration and dimensions are used, and in this case, the reception gain can be further improved by performing diversity reception by the glass antenna 5 and the antenna 13 other than the glass antenna 5.

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. With the antenna of this example, almost the same results as in Example 1 were obtained.

The preferred embodiments have been described above, but the present invention is not limited to these, and various applications are possible. Regarding the main element, it is generally preferable that the length C of the horizontal filament forming the loop shape is at least 350 mm and the length C is as long as possible so as to secure a distance of about 10 mm from the glass edge. The vertical length D is 20 mm to 150 mm when there is one loop, and the total length (D ₁ + D ₂ +) when there are two or more as shown in Examples 2 and 5.
...) may be appropriately selected within the range of 40 mm or more and 300 mm.

With respect to the auxiliary element, it extends from one of the corners of the loop-shaped element in parallel with one side edge, the upper side edge or the lower side edge, and further extends in parallel with at least the other side edge over three sides to the lower side or the upper side. In addition, power may be further supplied at the tip and four sides may extend parallel to the other side edge, and it is generally preferable that the distance between each side and the glass edge is set in the range of 10 to 100 mm. When it is provided in the upper half or in the lower half as in Example 6, the distance between the horizontal line on the center side and the glass edge greatly exceeds this range.

The distance between one side of the main elements arranged in parallel and the line extending along the other side edge of the auxiliary element is 10 mm or less, and can be appropriately selected in the range of about 3 mm or more. Well, the minimum parallel distance is 50m
m or more, and further, if necessary, auxiliary elements may be added and lengthened as shown in the auxiliary element 7 of the second embodiment, the auxiliary element 8 of the third embodiment, and the auxiliary element 11 of the fifth embodiment.

Although another auxiliary element is not always necessary, it can be added for the purpose of impedance adjustment, directional characteristic improvement, or capacitive coupling. Further, although the glass antenna of the present invention can be used alone, diversity reception is performed in combination with the side window glass on the opposite side, the antenna provided on the rear window glass or the front window glass, or the pole antenna. It is more preferable then.

When a laminated glass is used for the side 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.

[0022]

The glass antenna of the present invention comprises a loop-shaped main element and an auxiliary element arranged along the edge of a window glass, and a part of the auxiliary element and one side of the loop-shaped main element. Are arranged in parallel, and the distance between them is reduced to 10 mm or less, so that the V
It is possible to receive not only radio waves from the HF band to the UHF band but also FM radio broadcast waves.

[Brief description of drawings]

FIG. 1 is a front view of a vehicle equipped with a glass antenna of the present invention.

FIG. 2 is a front view of the essential parts showing Embodiment 1 in which the glass antenna of the present invention is provided on a side window glass for an automobile.

FIG. 3 is a front view of essential parts showing a second embodiment in which the glass antenna of the present invention is provided on a side window glass for an automobile.

FIG. 4 is a front view of a main portion showing a third embodiment in which the glass antenna of the present invention is provided on a side window glass for an automobile.

FIG. 5 is a front view of a main portion showing a fourth embodiment in which the glass antenna of the present invention is provided on a side window glass for an automobile.

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

FIG. 7 is a front view showing a sixth embodiment in which the glass antenna of the present invention is provided on a side window glass for an automobile.

[Explanation of symbols]

 1 Car 2 Side window glass 3 Main element 4 Auxiliary element 5 Antenna 6 Feeding point 7-12 Another auxiliary element 13 Another antenna

Claims (2)

[Claims] 1. An antenna provided on a side window glass for a vehicle, comprising: a loop-shaped main element in which both ends of a plurality of horizontal filaments are connected by vertical filaments; An auxiliary element that extends parallel to the side edge and the upper edge and further extends to the lower side parallel to at least the other side edge is provided, and power is supplied at the tip of the auxiliary element and one side of the main element and the auxiliary element. A glass antenna for a vehicle, characterized in that a line extending parallel to the other side edge is arranged in parallel and the distance between them is 10 mm or less. 2. An antenna provided on a side window glass for a vehicle, comprising: a loop-shaped main element in which both ends of a plurality of horizontal filaments are connected by vertical filaments; An auxiliary element extending parallel to the side edge and the lower edge and further extending parallel to at least the other side edge to the upper side is provided, and power is supplied at the tip of the auxiliary element and one side of the main element and the auxiliary element. A glass antenna for a vehicle, characterized in that a line extending parallel to the other side edge is arranged in parallel and the distance between them is 10 mm or less.