JP3556830B2 - Glass antenna for automobile - Google Patents

Description

[0001]
TECHNICAL 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 particularly to a glass antenna suitable for receiving VHF and UHF radio waves of TV broadcast waves.
[0002]
[Prior art]
Conventionally, as a glass antenna for a vehicle, an antenna provided in an upper margin portion or a lower margin portion of a conductive wire for heating a rear window glass, and an antenna provided with a linear antenna in a front window glass are known. Although it has been put to practical use, in the former, the space is originally small and the view may be obstructed. Therefore, a sufficient antenna occupying area cannot be obtained, and a sufficient receiving gain cannot always be obtained.
[0003]
Further, the antenna provided on the latter front windowpane has a relatively high reception gain, but there is a restriction on the mounting location beyond the rear windowpane so as not to obstruct the driver's view.
Accordingly, due to the widespread use of RV vehicles equipped with side windows having relatively large areas and relatively small areas, antennas provided on the side windows have been attracting attention. Many applications have been filed, such as 61509 and JP-A-61-265904.
[0004]
[Problems to be solved by the invention]
However, it can be said that there is no glass antenna that can be used even for a window glass having a smaller area in a relatively small vehicle model, and the proposed antenna requires a certain occupied area.
[0005]
The present invention has been made in view of such a point, and has a sufficient reception gain for the TV broadcast wave VHF band and the UHF band even when the window glass provided with the glass antenna is relatively small. It is an object of the present invention to provide a glass antenna having:
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is directed to an automotive vehicle in which two conductive wires are extended in parallel from a power supply portion provided on a vehicle side window glass to form two antennas. In the glass antenna, the two antennas have at least a line extending along one side and a line extending horizontally in the central region, and one of the lines has a frequency f1 in a 170 MHz to 195 MHz band of the TV broadcast wave VHF band. The tuning was performed so that the local maximum point of the reception gain was the frequency f2 of the band of approximately 195 MHz to 222 MHz of the TV broadcast wave VHF band and the local maximum point of the reception gain was in the range of f1 + 10 <f2. Ru der those characterized.
[0007]
The present invention is thus connected to a line extending horizontally in the central region and a vertical line connected to the horizontal line and extending along one side portion to the power supply portion, or a horizontal line connected to one side portion. Occupied area can be extremely small because there is only a horizontal line extending from the portion to the power supply portion on the upper side or the lower side adjacent to the side portion.
[0008]
The only occupied area is that the two antennas are arranged in parallel at least at an interval of at least 50 mm. Therefore, the two antennas are capacitively coupled to each other to compensate for the decrease in the reception gain, and one of the antennas is connected to the other antenna. By tuning so that the maximum point of the reception gain exists in the band of 170 MHz to 195 MHz and tuning the other antenna such that the maximum point of the reception gain exists in the band of 195 MHz to 222 MHz, almost half of the reception band can be reduced. One antenna can appropriately receive the remaining half by the other antenna, so that a sufficiently practical reception gain can be obtained.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An antenna according to the present invention is a glass antenna for an automobile in which two conductive wires are extended in parallel from a power supply portion disposed on a side window glass for a vehicle so as to form two antennas. Has at least a line extending along one side and a line extending horizontally in the central region, and one antenna has a line extending along the other side opposing the one side. An extended vertical line is an essential component, and the power supply section is arranged on one side, or the conductive line is extended to the upper side or lower side adjacent to one side side, and the upper side or lower side is A power supply unit may be provided.
[0010]
The two antennas are composed of a conductive line extending along each side and a line extending substantially parallel to the central region, and extend at least parallel to each other from the feeding portion to the central region, and the interval is 3 mm to 30 mm. Good.
[0011]
The auxiliary element is not always necessary, but the maximum point can be shifted and the impedance can be adjusted by a simple configuration such as one or more straight conductive lines or L-shaped conductive lines. What is necessary is just to add.
[0012]
Further, the antenna of the present invention can be provided on the left or right side window glass to receive only the radio waves of channels 4 to 12 of the TV broadcast wave VHF band and the radio waves of the TV broadcast wave UHF band. , AM radio broadcast wave, FM radio broadcast wave, TV broadcast wave When receiving radio waves of VHF band 1 to 3 channels, a pole antenna such as a whip antenna, a front window glass (front window) and a rear window glass (rear window). It is preferable to use a glass antenna provided in the window). Further, in that case, when receiving an FM radio broadcast wave or a TV broadcast wave, it is combined with a pole antenna, an antenna provided on a front window glass, a rear window glass, or an antenna provided on an opposite side window glass (preferably the configuration of the present invention). More preferably, diversity reception is performed.
[0013]
【Example】
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIGS. 1 to 4 are front views of the antennas according to the first to fourth embodiments mounted on one side window glass, respectively, as viewed from the outside of the vehicle.
[0014]
Example 1
A power supply unit is provided on the lower side of the glass sheet 1 mounted on one side window glass for a vehicle, which is an example corresponding to claims 1 and 3, and as shown in FIG. A horizontal line 31 extending approximately 45 mm in length from the power supply unit 2 along the lower side, and a vertical line connected to the horizontal line and extending substantially to the center along the side (right side) and approximately 260 mm in length. 32, a horizontal line 33 having a length of 160 mm, which is connected to the vertical line and extends substantially in the center region horizontally toward the other side (left side), is connected to the horizontal line, and extends along the side (left side) An antenna 3 extending downward and having a vertical line 34 having a length of 150 mm, a horizontal line 31 ′ having a length of approximately 35 mm extending along the lower side from the feed unit 2, and being connected to the horizontal line and having a side ( Along the right side) to the center, approximately 24 in length An antenna 3 'composed of a 0 mm vertical wire 32' and a 140 mm long horizontal wire 33 'connected to the vertical wire and extending substantially in the center region toward the other side (left side) horizontally. It is formed by screen printing before bending the sheet glass and baking simultaneously with the bending.
[0015]
The dimensions of the sheet glass 1 obtained in this manner were set to the side window glass of an automobile with the upper side length being about 210 mm, the lower side length being 240 mm, and the right side length being 470 mm. The antenna consisting of TV broadcast wave VHF is connected to the other antenna consisting of TV broadcast wave VHF so that the band of 170 MHz to 195 MHz, which is the range of channels 4 to 8 of TV broadcast wave VHF, has a high gain. The above-described dimensions are the results of tuning so that the band of 195 MHz to 222 MHz, which is the range of 8 to 12 channels of the band, has a high gain.
[0016]
The difference between the antennas obtained by combining the two antennas and receiving the radio waves of channels 4 to 12 (170 MHz to 222 MHz) in the VHF band of the TV broadcast wave and receiving the radio waves by a dipole (hereinafter, referred to as a dipole ratio). The average value was -12 dB, and the conventional antenna was about -18 dB, so that a very high reception gain was obtained even with a glass antenna provided on a small-sized window glass.
[0017]
In addition, when a radio wave in the UHF band of a TV broadcast wave was received and expressed in terms of a dipole ratio, it was -15 dB, and it was confirmed that it could be sufficiently used practically.
In practice, it is difficult to receive an AM radio broadcast wave, an FM radio broadcast wave, or the like by using the antenna of the present invention alone. Therefore, a whip antenna, a glass antenna provided in a front window, and a glass antenna provided in a rear window are used. Alternatively, the glass antenna of the present invention may be provided on the opposite side window glass, and diversity reception may be performed in combination with the antenna of the present invention.
[0018]
Example 2 to Example 4
Embodiment 2 shown in FIG. 2 is an example corresponding to Claims 1 and 3, wherein the antenna 3 extends along the horizontal line 31 having a length of approximately 85 mm extending along the lower side and along the side (left side). The antenna comprises a vertical line 32 having a length of approximately 220 mm, a horizontal line 33 having a length of 140 mm extending horizontally in a substantially central region, and a vertical line 34 having a length of 170 mm extending along a side (right side). 3 ′ is from a horizontal line 31 ′ having a length of approximately 95 mm, a vertical line 32 ′ having a length of approximately 240 mm, a second horizontal line 33 ′ having a length of 160 mm, and a vertical line 34 ′ having a length of 80 mm. This embodiment has the same configuration and dimensions as those of the first embodiment except that the antenna 3 'is further provided with an auxiliary element 3a' having a length of 70 mm.
[0019]
Embodiment 3 shown in FIG. 3 is an example corresponding to Claims 1 and 2, wherein the antenna 3 is a vertical filament 32 having a length of 230 mm extending from the feeding portion 2 along the side (left side). The antenna 3 'comprises a vertical line having a length of 190 mm and a horizontal line 33 having a length of 160 mm extending substantially horizontally in a substantially central region and a vertical line 34 having a length of 180 mm extending along a side (right side). Example 1 except that an antenna 3 was constituted by a line 32 ', a horizontal line 33' having a length of 130 mm, and a vertical line 34 'having a length of 80 mm, and an auxiliary element 3a having a length of 50 mm was added to the antenna 3. It has the same configuration and dimensions as those of FIG.
[0020]
Embodiment 4 shown in FIG. 4 is an example corresponding to claims 1 and 3, wherein the antenna 3 extends along the horizontal line 31 having a length of approximately 50 mm extending along the upper side and along the side (right side). A vertical line 32 having a length of approximately 160 mm, a horizontal line 33 having a length of 160 mm extending horizontally in a substantially central region, a vertical line 34 having a length of 140 mm extending along a side (left side), and furthermore Is formed by adding a horizontal line 35 having a length of 40 mm, and the antenna 3 ′ has a horizontal line 31 ′ having a length of approximately 60 mm, a vertical line 32 ′ having a length of approximately 230 mm, and a horizontal line 33 ′ having a length of 165 mm. The configuration and dimensions are the same as those of the first embodiment, except that the vertical stripes 34 'each have a length of 50 mm.
[0021]
The glass antennas of Examples 2 to 4 obtained in this manner also have a reception performance that exceeds the glass antenna 3 of Example 1 by about 1 to 2 dB with respect to the TV broadcast wave VHF band radio waves of channels 4 to 12, respectively. It was confirmed that the same or slightly higher receiving performance could be obtained for the UHF band of the TV broadcast wave.
[0022]
【The invention's effect】
As described above, the glass antenna of the present invention is an antenna provided on the side window glass, and even if the size of the window glass is small, the TV broadcast wave VHF band, especially the 4 to 12 channel broadcast, Waves and TV broadcast waves in the UHF band can be received with high gain.
[Brief description of the drawings]
[0023]
FIG. 1 is a front view in which an antenna according to a first embodiment is disposed on one side window glass, as viewed from the outside of a vehicle.
[0024]
FIG. 2 is a front view showing a second embodiment in which the glass antenna of the present invention is provided on one side window glass for an automobile.
[0025]
FIG. 3 is a front view showing a third embodiment in which the glass antenna of the present invention is provided on one side window glass for an automobile.
[0026]
FIG. 4 is a front view showing a fourth embodiment in which the glass antenna of the present invention is provided on one side window glass for an automobile.
[0027]
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheet glass 2 Feeding part 3, 3 'Glass antenna of this invention

Claims (1)

In a glass antenna for an automobile in which two conductive wires are extended in parallel from a power supply portion disposed on a side window glass for a vehicle to form two antennas, at least two antennas are provided on one side portion. , And at least a line extending horizontally in the central region, one of which has a maximum point of the reception gain at a frequency f1 in the 170 MHz to 195 MHz band of the TV broadcast wave VHF band, and the other has a TV broadcast wave VHF. A glass antenna for an automobile, wherein the antenna is tuned so that the maximum point of the reception gain exists in a frequency f2 in a band of approximately 195 MHz to 222 MHz and f1 + 10 <f2.

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