JPH10276025A - Glass antenna for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reception gain especially for FM radio broadcasting waves and AM radio broadcasting waves by capacitively coupling a first vertical wire with a bus bar disposed on the outer side of a conductive wire for heating, orthogonally crossing and connecting a second vertical wire with the conductive wire for heating and forming a power feeding part on one of the wires. SOLUTION: This antenna 4 composed of a second horizontal wire 43 connected to the lower side of the first vertical wire 41 and horizontally extended in a blank part at the lower part of the conductive wire for heating and the second vertical wire 44 connected to the tip of a first horizontal wire 42 and the tip of the second horizontal wire 43 , orthogonally crossed and connected with the conductive wire for heating and extended and the power feeding part 5 are printed, calcined and formed by conductive paste. The total length of the antenna 4 becomes 1810 mm and is a resonance length within the domestic FM radio broadcasting wave band of 76 MHz-90 MHz. Plate glass 1 obtained in such a manner is mounted to rear part window glass and a DC power source circuit is connected to the bus bars 3 and 3' on both sides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AM radio wave, an FM radio wave, etc.
The present invention relates to a glass antenna for receiving TV broadcast waves and the like, and more particularly to a glass antenna suitable for receiving FM radio broadcast waves and AM radio broadcast waves.

[0002]

2. Description of the Related Art Conventionally, as a glass antenna for a vehicle, an antenna provided on a rear window glass is generally employed because if it is provided on a front window glass, it obstructs the view of a driver or the like. In recent years, a number of applications have been filed for glass antennas for FM radio broadcast waves and glass for AM radio broadcast waves, and the upper margin of the conductive wire for heating has the widest space in the rear window glass, , And it is relatively easy to increase the reception gain.

[0003] Among them, an antenna in which a conductive wire is orthogonally connected to a conductive wire for heating and used as an antenna, a part of an antenna provided in an upper margin portion of the conductive wire for heating is partially connected to the conductive wire for heating. Japanese Patent Application Laid-Open No. 56-424, orthogonal to and connected to the filament
No. 01 and the like, and as an antenna provided with a vertical wire extending outside the heating conductive wire (bus bar), the present applicant also used the heating conductive wire from the tip of the wire extending vertically along the bus bar. Japanese Patent Application No. 60-262690 (Japanese Patent Application Laid-Open No. 62-123803) and Japanese Patent Application No. Hei 1-2202
No. 38 (JP-A-3-85004).

[0004]

However, the antenna disclosed in Japanese Patent Application Laid-Open No. Sho 56-42401 does not occupy the upper margin of the conductive wire for heating.
Even if a certain amount of reception gain is obtained for radio broadcast waves, it is difficult to obtain sufficient reception gain for FM radio broadcast waves.

The antenna disclosed in Japanese Patent Application No. Sho 60-262690 has a small occupied area, but in this case also, the antenna is high for radio waves over an extremely wide band from AM radio broadcast waves to TV broadcast waves. It was difficult to gain.

The present invention has been made in view of the above points, and is an antenna provided in an area smaller than the area of a conventional glass antenna. In particular, the present invention improves the reception gain for FM radio broadcast waves and AM radio broadcast waves. It is an object of the present invention to provide a glass antenna.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a vehicle in which a plurality of conductive wires for heating and a bus bar connected outside the conductive wires for heating are arranged. In the vehicle glass antenna provided on the rear window glass for
A first vertical strip extending vertically outside the bus bar;
A first horizontal line connected to the upper end of the vertical line and extending horizontally over the upper margin of the conductive line for heating, and a lower margin connected to the first vertical line and horizontally connecting the lower portion of the conductive line for heating. , And at least a second vertical line connected to the distal end of the first horizontal line and the distal end of the second horizontal line, and extending by connecting the heating conductive lines at right angles. In addition, the power supply portion is formed in any one of the filaments.

[0008] The first vertical line is capacitively coupled to a bus bar disposed outside the heating conductive line, and the second vertical line is orthogonally connected to the heating conductive line. In addition, each vertical wire efficiently picks up radio waves riding on the heating conductive wire.

Further, the first vertical line, the second vertical line, the first horizontal line, and the second horizontal line form a quadrilateral closed loop. Preferably, the loop-shaped line is formed. By making the total length approximately the resonance length of the reception frequency, the reception gain, particularly for FM radio broadcast waves and AM radio broadcast waves, is increased to a level exceeding the level of a conventional glass antenna and even exceeding a whip antenna.

Further, an auxiliary element connected to the conductive wire for heating or the bus bar may be added.
An auxiliary element connected to a horizontal line extending horizontally in the upper margin or the lower margin of the conductive wire for heating may be added.

It is preferable that the distance between the first vertical filament and the bus bar is set in a range of 1 mm to 10 mm, because the respective capacitances are capacitively coupled. In addition, 76MHz-9
For receiving 0 MHz FM radio broadcast waves, the distance between the bus bar and the metal body must be 5 mm or more,
For the reception of an FM radio broadcast wave of 8 MHz to 108 MHz, it is preferable to set the distance between the bus bar and the metal body to 10 mm or more, since a reception gain higher than that of a whip antenna is obtained.

Further, when a high-frequency coil is inserted into a DC circuit connected to a bus bar, the current leaking to the metal body is reduced when receiving an FM radio broadcast wave and when a choke coil is inserted, when receiving an AM radio broadcast wave. Is preferred.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The antenna of the present invention is particularly effective when the distance between a bus bar and a metal body is greater than a predetermined distance.

That is, specifically, in the antenna pattern of the first embodiment described later, F when the three-dimensional distance between the bus bar and the panel flange which is the tip of the metal body is changed.
FIG. 8 shows the result of measuring the reception gain for the M radio broadcast wave.
As is apparent from the results, when diversity reception is performed with another antenna such as a whip antenna as a main and the antenna of the present invention as a sub, the band of 76 MHz to 90 MHz is also 88 MHz to 1 MHz.
The band of 08 MHz can be sufficiently used if the distance between the bus bar and the metal body is about 3 mm or more.

However, when the antenna of the present invention is used alone or as a main antenna of a diversity antenna, a reception gain almost equal to that of a whip antenna is required. 1 in the band of 88 MHz to 108 MHz
If the bus bar is arranged so as to be 0 mm or more, FM radio broadcast waves can be suitably received.

Further, by separating the bus bar from the metal body to this extent, it is possible to reduce the ineffective capacity between the bus bar and the metal body when receiving an AM radio broadcast wave, and to reduce leaked radio waves.

The power supply section may be provided not only at the lower or upper corner to improve the workability at the time of connection, but also at a substantially upper central portion, a lower central portion, or the like of the window glass.

It is preferable to set the distance between the first vertical wire and the bus bar in the range of 1 to 10 mm so as to be capacitively coupled to the bus bar disposed on both sides of the heating conductive wire because the receiving gain is increased.

The second vertical filaments may be arranged substantially vertically at the center of the window glass so as to be orthogonal and connected over the entire width of the heating conductive filaments. When the total length (total length of the loop) obtained by adding the first horizontal line and the second horizontal line to the second vertical line is the wavelength of the received radio wave, the resonance length of the received radio wave is A certain nλα / 4 times (n is an integer and may be set to 3. α is a wavelength shortening rate, which is about 0.7 when FM radio broadcast waves are received, T
When receiving V broadcast waves, the total length is approximately 1400 mm to 220 mm.
What is necessary is just to determine so that it may be in the range of 0 mm.

Regarding the auxiliary element, the auxiliary element connected to the heating conductive wire or the bus bar can change the receiving frequency band, and is very effective depending on the vehicle type.

That is, the peak of the reception gain can be shifted. A part of the glass antenna of the present invention, in particular, an auxiliary element connected to a horizontal wire extending horizontally at an upper margin or a lower margin of a conductive wire for heating may improve a reception gain or a frequency characteristic depending on a vehicle type. Can be improved.

Although the antenna of the present invention can be used alone, other antennas provided on the rear window glass, antennas provided on the front window glass, antennas provided on the side window glass, whip antennas, etc. Of course, diversity reception may be performed in combination with a pole antenna or the like.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 4 show Embodiments 1 to 4 in which the glass antenna of the present invention is provided on a rear window glass for an automobile, respectively.
5 and 6 are frequency characteristic diagrams in the first and third embodiments, respectively, and FIG. 7 is a diagram showing terminal voltages when an AM radio band radio wave is received by the antenna 4 and the whip antenna in the first embodiment. It is a figure which shows an antenna 4 and a triangle shows a whip antenna.

Example 1 The interval between a bus bar and a metal body (panel flange) closest to the bus bar was set to 20 mm, and the frequency was 76 MHz to 90 MHz.
This is an example in which tuning is performed on domestic FM radio broadcast waves of 1 Hz.

As shown in FIG. 1, a flat glass 1 (upper side length A ₁ = 1100 m) mounted on a rear window glass for a vehicle.
m, lower side length A ₂ = 1350 mm, side vertical length B = 5
20mm) on the inside surface of the car, conductive heating wires 2, 2, ...
..One bus bar 3 together with two bus bars 3 and 3 '
Of the first conductive wire for heating which is connected to the first vertical wire 41 ₁ (the distance to the bus bar 5 mm) having a length of 400 mm and extending perpendicularly to the outside and the power supply portion 5 at the upper end of the first vertical wire. A first horizontal line 4 ₂ having a length of 460 mm extending horizontally in the upper margin (a distance of 50 mm from the uppermost conductive line for heating);
Is connected to the lower end of the first vertical strip, a second horizontal strip 4 ₃ lengths extending heating conductive filament lower margin portion horizontally 580 mm, the first and the distal end of the horizontal strip 4 ₂ second Horizontal streak 4
Is connected to ₃ of the tip, the heating conductive filament orthogonal, connected length extending the antenna 4 consisting of the second vertical strip 4 ₄ 370mm print by the feeding unit 5 a conductive paste and baking Form.

The total length of the antenna 4 is 18
It is 10 mm, which is the resonance length in the domestic FM radio broadcast wave band of 76 MHz to 90 MHz. The sheet glass thus obtained is mounted on the rear window glass of an automobile, and further, a DC power supply circuit is connected to the bus bars 3, 3 'on both sides.

High-frequency coils 6, 6 'and choke coil 7
One is connected to the DC power supply 8 through the other, and the other is grounded. With the DC circuit connected, the antenna of the present invention receives the horizontal polarization of the domestic FM radio broadcast band of 76 MHz to 90 MHz and the horizontal polarization of the FM radio broadcast band of 88 to 108 MHz in the European and American bands. do it,
When expressed as a gain difference (hereinafter abbreviated as dipole ratio) when the reception gain of a standard dipole antenna is 0 dB, the average is -11.9 dB and -16.2 dB, respectively, and the reception gain of the whip antenna is an average value. Is about -15 dB and about -16 dB, respectively.
It can be seen that the antenna is a very good antenna that greatly exceeds the reception gain of the whip antenna for the band of z to 90 MHz.

FIG. 5 shows the frequency characteristic representing the reception gain for each frequency at that time, and it can be seen that a stable reception gain can be obtained in any band. Also, 520K
When receiving the radio wave of the AM radio band from 1 Hz to 1620 KHz, the receiving performance is represented by a terminal voltage as indicated by ● as shown in FIG. 7, and the receiving performance of the whip antenna indicated by ▲ is substantially reduced in all the bands. It exceeds 3 dBμV, which indicates that the antenna is a very good antenna even for AM radio broadcast waves.

It has been confirmed that this antenna 4 has a reception gain comparable to that of a glass antenna which is generally used for TV broadcast waves. Example 2 A power supply portion was provided at a lower corner portion, a distance between a bus bar and a metal body (panel flange) closest to the bus bar was set to 20 mm, a first horizontal line was formed double, and a first horizontal line was formed. Add an auxiliary element 4 ₅ on the extension line,
This is an example of tuning for FM radio broadcast waves of 6 MHz to 90 MHz.

As shown in FIG. 2, the antenna 4 is connected to a feeder 5 provided at a lower left corner and has a length of 400 m.
m 1st vertical streak 4 ₁ (space 5m with bus bar 3)
m), the first horizontal strip 4 ₂ length connected to the vertical strip 4 ₁ of the upper end of the first is formed a double 560mm and 565 mm, 4 ₂ ', the length being connected to the power supply portion 5 680mm
The second horizontal strip 4 _3, is connected to the tip and the tip of the second horizontal strip 4 ₃ of the first horizontal strip 4 _2, 4 ₂ ', orthogonal to heat conductive filament length extending connection There the loop comprising the second vertical strip 4 ₄ 370 mm, in which the length is obtained by adding auxiliary element 4 ₅ 300 mm.

Further, except that an antenna 9 for receiving FM radio broadcast waves is added to the outside of the bus bar 3, the glass size and the power supply circuit for heating have the same configuration as in the first embodiment.

The antenna thus obtained receives the horizontal polarization of the FM radio broadcast band of 76 MHz to 90 MHz and the horizontal polarization of the FM radio broadcast band in the range of 88 to 108 MHz, and expresses it by the dipole ratio. And -12.6 dB and -17.4 dB on average, respectively.
A result far exceeding the whip antenna was obtained in the band of 76 MHz to 90 MHz.

A of 520 KHz to 1620 KHz
It was confirmed that the reception gain for the M radio broadcast wave was almost equal to that of the whip antenna. Example 3 The glass size was set such that the upper side length A ₁ = 950 mm and the lower side length A ₂
= 1120mm, side vertical length B = 540mm,
The feeding portion is provided on the upper center portion of the window glass, interval is 15mm the nearest metal body to the bus bar and the bus bar (panel flanges), is connected to a first auxiliary element 4 ₆ formed by extending the horizontal strips busbar 3 ' the auxiliary element 4 ₇ adds that an example in which tuned to the FM radio broadcast wave 88MHz～108MHz.

As shown in FIG. 3, the antenna 4 includes a first vertical line 4 ₁ (a distance from the bus bar of 2 mm) having a length of 370 mm and extending vertically outside one of the bus bars 3.
Is connected to the upper end of the vertical wire, extends horizontally through the upper margin of the heating conductive wire, and has a length of 420
The first horizontal line 4 ₂ , which is connected to the lower end of the first vertical line and extends horizontally through the lower margin of the heating conductive line, has a length of 500 mm, and the first horizontal line 4 ₃ , Horizontal streak 4 ₂
Is the tip connected to the distal end of (the power supply portion 5) and a second horizontal strip 4 _3, perpendicular to the heating conductive filament length extending connection 3
The second vertical strip 4 ₄ 40 mm, connected to the first horizontal strip 4 ₂ of the tip (the power supply portion 5), is extended length extending horizontally 4
Horizontal strip and length of 20mm is composed of the auxiliary element 4 ₆ length is folded over the vertical strip of 30mm consists horizontal strip of 180 mm, length 40mm which is further connected to the lower end portion of the bus bar 3 ' except that vertical strip and the length of which is appended an auxiliary element 4 ₇ consisting of horizontal strip of 740mm feed circuit for heating is also obtained by the same structure as in example 1. In this case, the auxiliary element 4
₇ may be connected to the conductive wire 2 for heating.

The horizontal polarization of the FM radio broadcast band of 76 MHz to 90 MHz and the horizontal polarization of the FM radio broadcast band of 88 MHz to 108 MHz are received by the antenna thus obtained, and expressed as a dipole ratio. On average, they were -15.4 dB and -13.7 dB, respectively, and greatly exceeded the whip antenna in the tuned band of 88 MHz to 108 MHz, and equivalent results were obtained in the band of 76 MHz to 90 MHz.

FIG. 6 shows the frequency characteristic representing the reception gain for each frequency at that time, and the high band is improved and a stable reception gain is obtained for the FM radio broadcast wave in the band of 88 MHz to 108 MHz. It is understood that it is possible.

In addition, A of 520 KHz to 1620 KHz
It was confirmed that the reception gain for the M radio broadcast wave was almost equal to that of the whip antenna. Example 4 A power supply unit was provided at the center of the lower part of the window glass, the distance between the bus bar and the metal body (panel flange) closest to the bus bar was 12 mm, the first vertical line, the first horizontal line,
The second horizontal strip, along with all of the second vertical strip forming a double, adding auxiliary element 4 _8, 76 MHz
This is an example in which tuning is performed on FM radio broadcast waves of up to 90 MHz.

As shown in FIG. 4, the antenna 4 has a length of 410 m extending vertically outside one of the bus bars 3.
m and 450 mm, the first vertical line 4 ₁ (interval with the bus bar 3 mm), 4 ₁ ′ (interval with the bus bar 3 2 mm), connected to the feeder 5 at the upper end of the first vertical line and heated The first horizontal strips 4 ₂ , 4 ₂ ′ having a length of 550 mm and 570 mm extending horizontally over the upper margin of the conductive strips for heating, are connected to the lower ends of the first vertical strips, and have lower margins for the heating conductive strips. the second horizontal strip 4 ₃ length extending part horizontally is 600mm and 620 mm, 4 ₃ 'is connected to the tip and a second horizontal strip 4 ₃ of the tip of the first horizontal strip 42, heat conductive filament Are orthogonally connected to each other, and a double loop is formed by the second vertical filaments 4 ₄ , 4 ₄ ′ having lengths of 390 mm and 410 mm, and the double loop includes the first horizontal filament and the second horizontal filament. Horizontal line with a length of 200 mm connected to the intersection of the vertical lines and a short vertical line connected to the tip Article and length is obtained by adding the auxiliary element 4 ₈ consisting of horizontal strip of 700mm in horizontal strip.

Further, in this embodiment, an antenna 10 is provided as a sub-antenna for receiving FM radio broadcast waves. Depending on the antenna thus obtained, 76 MHz to 90 MHz
MHz FM domestic radio wave band horizontal polarization, 88-1
When the horizontal polarization of the FM radio wave band in North America of 08 MHz is received and expressed by the dipole ratio, on average, each is -1.
2.2 dB and -18.1 dB, and a result far exceeding the whip antenna was obtained in the tuned band of 76 MHz to 90 MHz.

In this embodiment, the antenna 4 can of course receive the FM radio broadcast wave alone. However, it is more preferable to perform diversity reception with the sub-antenna 10.

[0041]

According to the present invention, the reception gain for the horizontal polarization of the FM radio broadcast wave band can be increased to a level exceeding the reception level of the whip antenna by skillfully combining the two vertical and horizontal lines. The reception gain is improved to a level exceeding the reception level of the whip antenna for AM radio broadcast waves, depending on the vehicle type, and the reception of TV broadcast waves is also enabled.

[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 rear 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 rear 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 rear 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 rear window glass for an automobile.

FIG. 5 is a frequency characteristic diagram illustrating a reception gain with respect to a change in frequency according to the first embodiment of the present invention.

FIG. 6 is a frequency characteristic diagram showing a reception gain with respect to a change in frequency in Embodiment 3 of the present invention.

FIG. 7 is a diagram showing terminal voltages when an AM radio band radio wave is received by the antenna 4 and the whip antenna according to the first embodiment, where ● represents the antenna 4 and ▲ represents the whip antenna.

FIG. 8 is a diagram illustrating the reception gain when the position of the bus bar of the antenna pattern of the first embodiment, that is, the distance between the bus bar and the metal body is changed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet glass 2 Heating conductive wire 3, 3 'bus bar 4 Antenna of this invention 5 Feeding part 6, 6' High frequency coil 7 Choke coil

Claims (7)

[Claims] 1. A vehicle glass antenna provided on a vehicle rear window glass provided with a plurality of heating conductive wires and a bus bar connected to the outside of the heating conductive wires. A first vertical line extending to the first vertical line, a first horizontal line connected to the upper end of the first vertical line, and extending horizontally over an upper margin of the heating conductive line; and a first horizontal line connected to the first vertical line. A second horizontal line extending horizontally through the lower portion of the heating conductive line, a first horizontal line, and a tip connected to the second horizontal line. The heating conductive lines are orthogonally connected to each other. A glass antenna for a vehicle, comprising at least a second vertical line extending, and a power supply portion formed on one of the lines. 2. A glass antenna for a vehicle according to claim 1, wherein an auxiliary element connected to a conductive wire for heating or a bus bar is added. 3. The heating wire according to claim 1, further comprising an auxiliary element connected to a horizontal wire extending horizontally at an upper margin or a lower margin of the heating conductive wire. Glass antenna for vehicles. 4. The distance between the first vertical filament and the bus bar is 1 mm.
The glass antenna for a vehicle according to any one of claims 1 to 3, wherein the glass antenna has a range of 10 to 10 mm. 5. An apparatus for receiving an FM radio broadcast wave of 76 MHz to 90 MHz, wherein a distance between a bus bar and a metal body is 5 mm.
The glass antenna for a vehicle according to any one of claims 1 to 4, wherein: 6. An apparatus for receiving an FM radio broadcast wave of 88 MHz to 108 MHz, wherein the distance between the bus bar and the metal body is 10 mm.
The glass antenna for a vehicle according to any one of claims 1 to 4, wherein the glass antenna is not less than mm. 7. The glass antenna for a vehicle according to claim 1, wherein a DC power supply is connected to the bus bar via a high-frequency coil and a choke coil.