JPH0486002A - Glass antenna for vehicle - Google Patents

Abstract

PURPOSE:To improve reception gain by adding a first auxiliary element which is inverted-L-shaped. CONSTITUTION:For a main element 4, two parallel and horizontal lines are connected by a perpendicular at the end parts to the upper blank part of a heating filament, and this main element 4 and a first auxiliary element 5, which is inverted-L-shaped, are formed together with a feeding point 6 by screen- printing and burning conductive paste. For the glass antenna for vehicle obtained in this way, the horizontal wire of the first auxiliary element 5 is arranged beyond a central line CL from the feeding point so that the main element 4 can cross the longitudinal central line CL of window glass. Thus, reception gain can be improved in a frequency band over an extremely wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a glass antenna for vehicles such as automobiles, and more particularly to a glass antenna suitable for receiving FM radio broadcast waves and TV broadcast waves.

[Prior Art] In recent years, there has been a demand for vehicle glass antennas for receiving TV broadcast waves in addition to radio broadcast waves such as AM and FM. JP-A No. 61-203702), an antenna for receiving FM radio broadcast waves and TV broadcast waves is provided in the upper margin of the anti-fog heating strip on the rear window glass (JP-A No. 61-121)
Various proposals have been made, such as No. 60'3).

[Problems to be solved by the invention] However, in the former case, since the antenna is arranged in the vertical center of the window glass, it is unavoidable that it obstructs the driver's view, and in the latter case, the antenna is placed in the vertical center of the window glass. The occupied area is small. It is difficult to obtain sufficient reception gain over a wide band from FM radio broadcast waves to TV broadcast waves in the U11F band.

The present invention has been made in view of these points, and even in the tricky area above the heating line on the rear window glass, it can be used to broadcast a very wide range of signals from FM radio broadcast waves to TV broadcast waves in the T, J, and HF bands. An object of the present invention is to provide a glass antenna for a vehicle that has improved reception gain in a frequency band.

[Means for Solving the Problems] The present invention provides a glass antenna provided in the margin above the heating line of a rear window glass for a vehicle, with a length of 450 m to 1.
．． The main element consists of two parallel horizontal lines of 100 ms, connected by a vertical line at least 200 fi from the end at one end, and is arranged so as to cross the center line of the window glass. A first auxiliary element having an inverted letter shape extends horizontally beyond the center line from a power feeding point provided on one side of the main element, further extends vertically downward, and is connected to the main element. It is characterized in that it is set up.

[Function] The present inventors have constructed two parallel horizontal lines with a length of 450 fl to 1,100 m in the blank area above the heating line of a rear window glass for an automobile, and at least one end of the heating line. By arranging elements connected by vertical lines between 200fi so as to cross the center line of the window glass, the gain is high over a wide band from FM radio broadcast waves to TV broadcast waves, and it acts as a main antenna. It is preferable to connect vertical wires at the ends because broadband properties can be obtained, but there is not much difference from the ends up to about 200fi.
If it is larger than a crane, the receiving gain will decrease, which is not preferable.

Furthermore, if the receiving frequency range is relatively narrow, it may be better to connect within 200 meters from the end.

Further, by adding at least the first auxiliary element having an inverted letter shape, this portion can improve the directivity characteristics or act as an auxiliary antenna that adjusts the impedance, thereby further improving the reception gain.

[Example 1 Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 7 are front views showing Examples 1 to 7, respectively, in which the glass antenna of the present invention is provided on a rear window glass for an automobile.

This is an example in which the support 1 single-pane glass is attached to the rear window glass of a car.As shown in Figure 1, on the inside of the car side of the plate glass 1 are anti-fog heating strips 2, 2, 2, 2, busbars, etc. 3. In addition to 3.3, conductive paste is applied to the main element 4, in which two horizontal lines parallel to the upper margin of the heating line are connected by a vertical line at the end, and the first auxiliary element 5, which has an inverted letter shape, together with the feed point 6. Formed by screen printing and firing.

In the thus obtained vehicle glass antenna, the main element 4 crosses the longitudinal center line CL of the window glass, and the horizontal line of the first auxiliary element 5 extends from the feeding point beyond the center line CL. The dimensions of each part are A1 = 1,460 vm, A2-1. L0w
, B = 740 tm, C = 850 days, D = 30w+
t.

E=660 Tsuru, F=90m, G=30fi, H=20m
FM radio broadcast waves from 76 MHz to 108 MHz (domestic and North American bands), TV broadcast waves from channels 1 to 12 in VHF band, 470 MHz) Iz ~ 77
The average reception gain in the horizontal polarization of the 0MHz LIHF TV broadcast wave band is measured and expressed as the gain difference (hereinafter referred to as the Gouibor ratio) when the reception gain of a standard dipole antenna is OdB. 16.0clB,
-18.5 dB, -17.8 dB, and the reception gains of good vehicle glass antennas that have been used in practical use are about -19 dB, -20 dB, and -1, respectively, on average.
Since it is 9 dB, it exceeds it in all bands, and it can be seen that it is an excellent antenna.

In the second embodiment shown in FIG. 2, the other end of the main element 4 is also closed,
The structure and dimensions are the same as in Example 1 except that c=qoow is used as a closed loop.

With such a vehicle glass antenna, 76MHz
~108MHz FM radio broadcast waves, TV broadcast waves■H
When the average reception gain in horizontally polarized waves of the F band and TV broadcast LIHF band is measured and expressed as the Gouibor ratio, each is -
L, 8B, -19, 1 dB, -18, 2 dB,
Good results similar to those of Example 1 were obtained.

Embodiment 3 shown in Figure 3 has the main element 4 as C-900 deaf,
The configuration and dimensions are the same as in Example 1, except that D=2On, I=900 fl, and a second auxiliary element 7 connected to the main element 4 using J-20 Tsuru.

With such a vehicle glass antenna, 76MHz
~108MJIz FM radio broadcast waves, TV broadcast waves■
) The average reception gain in the horizontal polarization of the IF band and TV broadcast UHF band is measured and expressed as a dipole ratio: -17, 8 dB, -18, 2 clB, -17, 2 d, respectively.
B, and a good result equivalent to or slightly better than Example 1 was obtained.

Embodiment 4 shown in FIG. 4 has the same structure and dimensions as Embodiment 3 except that the second auxiliary element 8 is connected to the main element 4.

With such a vehicle glass antenna, 76MHz
~108MHz FM radio broadcast waves, TV broadcast waves■HF
The average receiving gain in the horizontally polarized waves of the band and UHFIF TV broadcast waves is measured and expressed as a dipole ratio, which is -18.
, 8 dB -18.7 dB, -17.6 dB, and results equivalent to or close to Example 1 were obtained.

Support m In the fifth embodiment shown in FIG. 5, the main element 4 is C=80On.
The configuration and dimensions are the same as in Example 3 except that the second auxiliary antenna 9 is set to I=900.

With such a vehicle glass antenna, 76MHz
~108M)lz(7) F M-y geo broadcast wave, T
When the average reception gain in the horizontal polarization of V broadcast waves VHF band and TV broadcast waves UHF band is measured and expressed as a dipole ratio,
-17, 2dB -18°1dB, -17 respectively
, 8 dB was obtained.

Embodiment 6 shown in FIG. 6 has the opening direction of the element 4 reversed and the end folded back, and a second auxiliary element 10 in the shape of an inverted T is added. Embodiment 7, shown in FIG. The second auxiliary element 11 and the third auxiliary element 12 connected to the first auxiliary element 5 are added, and almost the same results as in Example 1 can be obtained in each band.

Although the present invention has been described above using preferred embodiments, the present invention is not limited to these embodiments, and various applications are possible.

Regarding the main element, the length C of the two horizontal filaments is in the range of 450 to 1,100 wm, and may be selected appropriately depending on the receiving frequency, but preferably 700 to 90 wm.
A range of 0 days is good. The vertical length D is preferably in the range of 10 to 60 m, preferably 20 to 40 m. Also, it is better to arrange the main elements at approximately equal lengths from the center line CL.
This is preferable because the reception gain is higher than when the center icL is extremely biased to the extent that it does not cross to the left or right.

For the first auxiliary element with an inverted letterform, the horizontal length E is from the feed point provided on either side to the center line C.
Since the receiving gain is higher when the length is longer than the center line than when it does not reach L, it is sufficient to select the length as appropriate within the range that can be connected to the king element with the lower limit being up to the center ICL. Also, the vertical length F is 30 to 100 Tsuru , preferably in the range of 40 to 90 days.

a second auxiliary element connected to the main element and a first
Although the third auxiliary element connected to the auxiliary element is not necessarily required, various auxiliary elements may be used for purposes such as impedance adjustment, directivity improvement, broadband improvement, or capacitive coupling with the heating wire. can be added.

Although the glass antenna of the present invention can be used alone, it can also be used with other glass antennas installed in the lower margin of the heating strip of the rear window glass, glass antennas installed in the front window glass, side window glass, etc. Even better results can be obtained by performing diversity reception in combination with a ball antenna or the like.

Further, when laminated glass is used for the rear window glass, the glass antenna may be formed by embedding a thin metal wire such as a copper wire in the interlayer film.

[Effects of the Invention] The glass antenna of the present invention can transmit signals ranging from FM radio broadcast waves to TV broadcast waves in the UHF band by combining a main element with a specific length and an inverted-shaped first auxiliary element with a specific length. This has the effect of significantly improving reception gain in a very wide frequency band from 76 MHz to 7701t (z).

[Brief explanation of drawings]

1 to 7 are preferred embodiments 1 to 7 of the present invention, respectively.
FIG. 7 is a front view showing Example 7. 1...Plate glass 2...Heating strip for anti-fogging 3.
...Bus bar 4...Main element 5...First auxiliary element 6...Feeding points 7-11...Second auxiliary element 12...Third auxiliary element

Claims (1)

[Claims] A glass antenna installed in the blank area above the heating strip of a rear window glass for a vehicle, with a length of 450 mm to 1,100 mm.
A main element consisting of two parallel horizontal lines of 200mm in diameter and connected by a vertical line at least 200mm from the end is arranged to cross the center line of the window glass, and either An inverted L-shaped first auxiliary element is provided that extends horizontally beyond the center line from a power feeding point provided on one side, further extends vertically downward, and is connected to the main element. A glass antenna for a vehicle, which is characterized by being designed to do so.