JPH1013126A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively arrange a TV broadcasting wave receiving antenna in a small space and to arrange a radio broadcasting wave receiving antenna for receiving electric wave with a low frequency in a margin part by executing diversity reception by means of the plural antennas at the time of receiving TV broadcasting wave. SOLUTION: Two systems of TV broadcasting wave receiving antennas 2 and 3 for a vehicle are respectively provided along two right and left side window glass peripheral parts and also arranged in parallel, so as to mutually interfere. One antenna of the two systems is for tuning to a VHF-L band, and the other antenna is for tuning to a VHD-H band, and also diversity reception is executed by the at least four systems of antennas 2 and 3, at the time of receiving TV broadcasting wave. Thus, a conductive wire can be made with substantially one side, an exclusive area is made to be small, and the radio broadcasting receiving antenna 6, etc., which require the large exclusive area can be arranged.

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 provided with a glass antenna.
The present invention relates to a glass antenna suitable for suitably receiving V broadcast waves, AM radio broadcast waves, and FM radio broadcast waves.

[0002]

2. Description of the Related 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, an antenna provided with a linear antenna in a front window glass, and the like. Although it is known and practically used, in the former case, the space occupied by the antenna is reduced because the space is originally small and the view may be obstructed, so that sufficient reception gain cannot always be obtained. Did not.

Further, the antenna provided on the front windowpane has a relatively high reception gain, but there is a restriction on a mounting place beyond that of the rear windowpane so as not to obstruct the driver's view.
Accordingly, due to the widespread use of RVs equipped with side windows having relatively large areas and relatively small area windows, antennas provided on the side windows have been attracting attention. Japanese Utility Model Application Laid-Open No. 58-61509 for performing diversity reception by providing a pair of antennas on a window glass
Japanese Patent Laid-Open No. 61-265904, in which two antennas are provided on at least one side window glass and one is arranged clockwise and the other is arranged counterclockwise, a pair of feeding parts are separated from each other. No. 61-197710, in which an antenna line extending in the vertical direction from the power supply unit is provided, and two systems of antennas are provided over almost the entire area of the side window glass.
Numerous applications such as 197712 have also been filed.

[0004]

However, Japanese Utility Model Application Laid-Open No. 58-61509 discloses diversity reception using antennas on the right and left side window glasses.
Since the signal is received by a system antenna, a TV broadcast wave band of 1 to 3 channels (hereinafter abbreviated as VHF-L band) and a TV broadcast wave band of 4 to 12 channels (hereinafter referred to as VH
It is difficult to receive a very wide range of radio waves in the UHF band of TV broadcast waves.

Japanese Unexamined Patent Publication Nos. 61-265904, 61-197710, 61-197712, etc. disclose two systems of antennas for receiving TV broadcast waves. Since antenna lines and power supply parts are arranged apart so that the two systems of antennas do not interfere with each other, the occupied area must be at least from the two sides of the peripheral part to the whole area. It was difficult to provide a radio antenna or the like for receiving radio signals in terms of space.

The present invention has been made in view of the above points, and an antenna for receiving a TV broadcast wave can be effectively disposed in a small space. An object of the present invention is to provide a glass antenna for a vehicle in which an antenna for receiving a radio broadcast for receiving radio waves or the like can be provided.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a TV broadcast wave receiving antenna provided along the periphery of both left and right side windowpanes for a vehicle. Along with providing two systems, the two antennas have portions arranged in parallel so as to interfere with each other,
One of the two systems is tuned to the VHF-L band, the other antenna is tuned to the VHF-H band, and diversity reception is performed by at least four of these antennas when receiving a TV broadcast wave. Further, two antennas for TV broadcast wave reception are provided on almost one arbitrary side, and at least a radio reception antenna wire for receiving FM radio broadcast waves is provided in the remaining area. In addition, it is preferable that not only the left and right TV broadcast wave receiving antennas perform diversity reception when receiving TV broadcast waves, but also that the left and right radio broadcast receiving antennas perform diversity reception when receiving FM radio broadcast waves.

In the case of extending clockwise and counterclockwise from two power supply units provided close to each other as in Japanese Patent Application Laid-Open No. 61-265904, the conductive material extends over at least two sides of the window glass and, in some cases, over the entire circumference. Although the wire is occupied, in the present invention, the conductive wire occupies almost one side, the occupied area is small, and most of the remaining space is provided with a radio broadcast receiving antenna or the like that requires a large occupied area. Can be arranged.

The two antennas have a portion where the two antennas extend in parallel so as to interfere with each other. One of the antennas is tuned to a pattern suitable for the VHF-H band, and the other is tuned to the VHF-L band. Since the band is tuned to a pattern suitable for the band, the two-system antenna is compared with a conventional antenna in which the average reception gain is increased over a wide range from the VHF-L band to the VHF-H band. Then, when receiving the VHF-L band, VHF-
The gain of the antenna tuned to the L band is naturally higher, and the receiving gain of the antenna tuned to the VHF-H band is naturally higher at the time of VHF-H band reception. Further, by interfering the two antennas, the reception performance is improved as compared with the case where each antenna is used alone.

In the present invention, the reception band of a single antenna is not widened, one is tuned to the VHF-L band, and the other is tuned to the VHF-H band, so that the antenna lines of both antennas have a reception gain. Can be improved as compared with the case of alone.

However, since the antennas of the two systems have similar directional characteristics, the fact that the antenna patterns of the same configuration have different directional characteristics by providing them on the left and right side window panes takes advantage of this fact. The similarity of the directional characteristics is compensated for by providing two systems of antennas having different configurations on the left and right side window glasses and performing diversity reception by the four systems of antennas.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Two television broadcasting wave receiving antennas of the present invention are arranged so that horizontal lines extending at least in parallel are spaced at a distance of 30 mm or less and 1 mm or more so as to interfere with each other, and the length of the parallel portion is reduced. It is sufficient if the length is set to 50 mm or more. One of the antenna strips is set to a pattern suitable for receiving the TV broadcast wave VHF-L band, tuned to this band, and the other antenna strip is used to receive the TV broadcast wave VHF-H band. What is necessary is just to make a pattern suitable for this and tune to this band.

In this case, the two systems of antennas provided on the left and right windowpanes may have exactly the same pattern but different directional characteristics, but may have different patterns. The feeder of the two antennas can be used at any one of the corners, but the upper corner is preferable because the reception gain is high for receiving TV broadcast.

Further, as shown in the embodiment, in addition to the corners, they may be provided at the center of the periphery of each side. Also,
It is preferable that the two power supply units of the two systems of TV broadcast wave receiving antennas be provided close to each other so that connection work can be performed at one place. However, although not shown in the embodiments, they may be separated from each other.

An antenna for receiving an FM radio broadcast wave and an AM radio broadcast wave is not necessarily required. However, in addition to the embodiment shown in the embodiment, the remaining sufficient space provided with an antenna for receiving a TV broadcast wave is used. Also, various antennas such as an antenna for a car phone and an antenna for a keyless entry system can be provided.

With respect to diversity reception, when receiving a TV broadcast wave, diversity reception is performed by two antennas provided on the left and right window glasses, that is, four antennas. When receiving the VHF-L band, the diversity reception is performed. Tuned to VHF-L band of window glass 2
Switch to one of the two antennas, which is essentially a diversity reception with two antennas, VHF-
When receiving the H band, the antenna is switched to one of the two antennas tuned to the VHF-H band of the left and right windowpanes. Since the diversity reception is substantially performed by the two antennas, the VHF-L band is received when the VHF-L band is received. When receiving the VHF-H band, diversity reception may be performed by the left and right antennas tuned to the VHF-H band, that is, two antennas.

Further, diversity reception may be performed by adding a pole antenna such as a glass antenna provided on another rear window glass, a front window glass, or a whip antenna.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 are front views of the antenna in Example 1 of the present invention mounted on one side window glass and the other side window glass, respectively, as viewed from the inside of a vehicle, and FIGS.
FIGS. 6A and 6B are front views as viewed from the inside of the vehicle, showing Examples 2 to 4 in which the glass antenna of the present invention is provided on the side window glass for an automobile, respectively. FIGS. FIG. 7 and FIG. 8 are frequency characteristics charts when the L band and the VHF-H band are received, and FIG. 7 and FIG.
FIG. 4 is a directional characteristic diagram at 200 MHz in a TV broadcast wave VHF-H band.

Embodiment 1 As shown in FIG. 1, two T-systems of the present invention are provided on the inner surface of a glass sheet 1 mounted on one side window glass for a vehicle.
V broadcast wave receiving antennas 2 and 3 and respective feeding units 4
And 5 are provided together with an antenna 6 for receiving an AM broadcast wave and an FM broadcast wave and a feeder 7 thereof. As shown in FIG. 2, the other sheet glass 1 ′ is provided with the antennas 2 ′ and 3 ′ of the present invention, respectively. This is an example in which a power supply unit 4 ', 5', an antenna 6 'for receiving FM radio broadcast waves, and a power supply unit 7' are provided.

A glass sheet 1 mounted on one side window glass has a VHF-180 mm long horizontal line.
VHF-H band receiving antenna 2 tuned to H band
And its power supply unit 4, a length of horizontal strip 3 ₁ of 500 mm, length horizontal strip 3 ₂ wrapping 400 mm, length 20
Short vertical strip with horizontal strip 3 ₃ 0mm of folded 3 _4, 3
_5, 3 tuned to the VHF-L band consisting of ₆ the VH
Along with the FL band receiving antenna 3 and its feeding section 5, the AM
The antenna 6 for receiving the radio broadcast wave and the FM radio broadcast wave and the power supply unit 7 are screen-printed before bending, and fired simultaneously with the bending.

A VHF-H band tuned to a VHF-H band consisting of horizontal stripes having a length of 180 mm is provided on the inside surface of the glass sheet 1 'mounted as the other side window glass.
H-band receiving antenna 2 'and its feeding section 4', length 500
mm horizontal line 3 ₁ ′, 400 mm long horizontal line 3 ₂ ′, 200 mm long horizontal line 3 ₃ ′ and short vertical line 3 ₄ ′, 3 ₅ ′, 3 ₆ ′ V
Along with the VHF-L band receiving antenna 3 'tuned to the HF-L band and its feeder 5', the antenna 6 'for receiving FM radio broadcast waves and its feeder 7' are screen printed before bending. It is formed by firing simultaneously with bending.

The thus obtained glass sheets 1, 1 '
A = 600 mm, A ′ = 600 mm, B = 45
0 mm, B '= 430 mm, and mounted on the side window glass of a car, and the antennas 2, 2'3, and 3' of the present invention use the VHF-L band, VHF-H band, and 470 MHz to 77 mm.
When a 0 MHz TV broadcast wave UHF band (hereinafter abbreviated as UHF band) is received and the reception gain of a standard dipole antenna is set to 0 dB, the gain difference (hereinafter abbreviated as dipole ratio) is 2 is the average value-
32.0 dB, -15.7 dB, -17.6 dB, and the antenna 3 has an average value of -16.2 dB, -1, respectively.
22.3 dB and -17.3 dB, and the antenna 2 'has an average value of -33.5 dB, -17.9 dB and -2 respectively.
16.8 dB, and the antenna 3 'has an average value of -16.5 dB, -26.4 dB, and -16.2 dB, respectively, and the antennas 3 and 3' have VHF
It can be seen that antennas 2 and 2 'are good antennas for the -H band. Also, it can be seen that each antenna is a good antenna for the UHF band.

The frequency characteristics representing the reception gain for each frequency of 1 MHz are as shown in FIG. 6 for the TV broadcast waves VHF-L band and VHF-H band, and the codes match those of the antenna. The curve above the four antennas is Max
This is the value, and when the four antennas are switched to the antenna having the maximum reception gain and diversity reception is performed, the reception is performed with this Max value, so that it can be seen that good reception is possible.

FIG. 7 shows the directional characteristics of the antenna of the present invention.
As can be seen from the directional characteristics of the TV broadcast wave VHF-L band 100 MHz and the TV broadcast wave VHF-H band 200 MHz shown in FIG. 8, the directional characteristics of the antennas 2 and 2 'are different, and the directional characteristics of the antennas 3 and 3' are different. It can be seen that the characteristics are different and the drop of the reception gain (dip) is compensated for each other.

The antennas 2 and 3 shown in FIG.
The distance between the conductive wires 33 is 15 mm, and the length of the parallel portion is 1
In the VHF-L band, the reception gain of the antenna 2 is about 2 dB in the VHF-L band, as compared with the case of the single antenna.
Has improved.

In this embodiment, when an AM radio broadcast wave is actually received, it is received by the antenna 2, and when an FM radio broadcast wave is received, diversity reception is performed by the antenna 2 and the antenna 2 'of the present invention. ,
When receiving the TV broadcast wave VHF band, diversity reception is performed by the antennas 2, 3, 2 ', 3' of the present invention.

Embodiment 2 to Embodiment 4 Embodiment 2 shown in FIG. 3, Embodiment 3 shown in FIG. 4, and Embodiment 4 shown in FIG. 5 are all mounted on one side window glass for a vehicle. This is an example in which the two glass antennas 2 and 3 for receiving TV broadcast waves of the present invention and the respective feeders 4 and 5 are provided on the inner surface of the plate glass 1 (the other side window glass is omitted). Do).

The second embodiment is an example in which feed portions of two antennas are provided at the corners. A VHF-H having a 220 mm long horizontal line is provided on a sheet glass 1 mounted on one side window glass. VHF-H band reception antenna 2 and its feed unit 4, which is tuned to the band, horizontal strips 3 ₂ whose length horizontal strip 3 ₁ of 350 mm, a length folded in 540 mm,
Short vertical strip with horizontal strip 3 ₃ whose length is folded back of _{100mm 3 4, 3 5 VHF-} L band reception antenna 3 that is tuned to VHF-L band consisting of with its power supply portion 5, AM radio broadcast waves and Example 1 except that an antenna 6 for receiving FM radio broadcast waves and a power supply unit 7 were provided.
It has the same configuration as that of FIG.

[0029] Example 3 is an example in which two systems of antennas along the sides, the glass sheet 1 to be attached to one of the side window glass, length horizontal strip 2 ₁ 40 mm, length 12
0mm horizontal strip 2 _2, length 30mm of vertical strip 2 ₃ VHF-H VHF-H band reception is tuned to band antenna 2 and its feed section 4 consisting of, length 70mm horizontal strip 3 _1, Vertical filament 3 _{2 with} a length of 400 mm, length 30
0mm of vertical strip 3 _3, length vertical strip 3 ₄ 360 mm, length 40mm horizontal strip _35, is 100mm in length
With horizontal strip 3 ₆ and VHF-L band reception antenna 3 that is tuned to VHF-L band thereof consisting of the power supply portion 5, the antenna 6 and its power supply portion 7 for receiving AM radio broadcast waves and FM radio broadcast waves provided the Example 1 except for
It has the same configuration as that of FIG.

Embodiment 4 is an example in which two systems of antennas are provided along the lower side, and a VHF formed of a horizontal line having a length of 200 mm is attached to a sheet glass 1 mounted on one side window glass.
-H band tuned the VHF-H band reception antenna 2 and its feed unit 4, the length of 550mm horizontal strip 3 _1,
Length 450mm horizontal strip 3 _2, short vertical strip length and horizontal strip 3 ₃ 220 mm 3 _4, 3 ₅ consists VHF-L
The configuration is the same as that of the first embodiment except that a VHF-L band receiving antenna 3 tuned to a band and a feeding unit 5 thereof, an antenna 6 for receiving FM radio broadcast waves and a feeding unit 7 are provided.

The glass antennas 2 and 3 in Examples 2 to 4 obtained in this manner are also the same as those in Example 1 respectively.
It has been confirmed that the antennas 2 and 3 have the same reception performance.

In the embodiments 2 to 4, only the antenna disposed on the window glass on one side is shown.
When these are actually used, diversity reception is performed with a glass antenna having the same requirements provided on the other side window glass, and the directional characteristics are different between left and right as shown in the first embodiment. Is more effective.

[0033]

As described above, the glass antenna of the present invention is an antenna provided on the side window glass, and can effectively arrange two TV broadcast wave receiving antennas in a small space. Therefore, an antenna for receiving other low-frequency AM radio broadcast waves, FM radio broadcast waves, and the like can be provided in the remaining margin.

Further, since the two systems of antennas are arranged so as to interfere with each other, the reception gains of the two systems are improved, and one is tuned to the VHF-L band and the other is tuned to the VHF-H band. The reception gain in each band is improved compared to the case of tuning in a wide range, and the disadvantage that the directional characteristics are similar due to interference is provided by providing two antennas on the left and right window glasses, The difference in directivity due to the difference between left and right can be completely compensated for.

[Brief description of the drawings]

FIG. 1 is a front view in which an antenna according to a first embodiment is disposed on one side window glass when viewed from inside a vehicle.

FIG. 2 is a front view of the antenna in Embodiment 1 provided on the other side window glass as viewed from the inside of the vehicle.

FIG. 3 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.

FIG. 4 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.

FIG. 5 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.

FIG. 6 shows a TV broadcast wave V generated by the antenna according to the first embodiment.
It is a frequency characteristic figure at the time of receiving HF-L band and VHF-H band.

FIG. 7 shows a TV broadcast wave V generated by the antenna according to the first embodiment.
FIG. 5 is a directional characteristic diagram at 100 MHz in the HF-L band.

FIG. 8 shows a TV broadcast wave V generated by the antenna according to the first embodiment.
FIG. 3 is a directional characteristic diagram at 200 MHz in the HF-H band.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 sheet glass 2, 2 ′, 3, 3 ′ TV broadcast wave receiving antenna of the present invention 4, 4 ′, 5, 5 ′ feed unit 6 radio receiving antenna 7 feed unit

Claims (2)

[Claims] 1. Two sets of antennas for receiving TV broadcast waves are provided along the periphery of both left and right side window glasses for a vehicle, and the two sets of antennas are arranged in parallel so as to interfere with each other. And one of the two antennas has a VHF band 1-3 channel T
Tune to V broadcast wave band and set the other antenna to 4-1
A glass antenna for a vehicle, wherein the antenna is tuned to a TV broadcast wave band of two channels, and diversity reception is performed by at least four antennas when receiving the TV broadcast wave. 2. An arbitrary substantially one side of the right and left side window glasses has a T.
An antenna for receiving a V broadcast wave is provided, and an antenna line for receiving a radio wave for receiving at least an FM radio broadcast wave is provided in the remaining area. When receiving a radio broadcast wave, the left and right radio broadcast receiving antennas
2. The glass antenna for a vehicle according to claim 1, wherein diversity reception is performed.