JPH0481003A - Glass antenna for vehicle - Google Patents

Abstract

PURPOSE:To improve reception gain in a frequency band over a wide range from an FM radio broadcasting wave to the UHG band of a TV broadcasting wave by combining a main element which closes one end of two horizontal lines having a specified length at least, first inverse L-shaped auxiliary element and second auxiliary element. CONSTITUTION:An element 4 is operated as a main antenna while closing one end of two horizontal lines, which are provided at the blank part of the upper part of a heating filament 2 of rear window glass for vehicle, having the length of 500mm-1050mm at least. Further, near the central part of the upper horizontal line of this element 4, two vertical straight lines are connected while being separated for 100-200mm, and first and second auxiliary elements 5 and 6 are operated as auxiliary antennas with the inverted L shape extending horizontally toward one side part and the other side part respectively. Thus, reception gain can be improved in the frequency band over the wide range from the FM radio broadcasting wave to the UHF band of the TV broadcasting wave.

Description

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

[Conventional Technique #rl 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. Japanese Unexamined Patent Publication No. 61-203702), an antenna for receiving FM radio broadcast waves and TV broadcast waves is provided in the upper margin of the heating strip for heat protection on the rear window glass (Japanese Unexamined Patent Publication No. 61-121)
Various proposals have been made, such as No. 603).

However, in the former case, since it is installed in the vertical center of the window glass, it is unavoidable that it obstructs the driver's view, and in the latter case, the area occupied by the antenna is small. It has been difficult to obtain sufficient reception gain over a wide band up to the UHF band of TV broadcast waves.

In addition, as the number of car phones installed is increasing, a conductive pedestal connected to the antenna is installed directly on the outside side of the window glass as an antenna, and a conductive pedestal installed on the opposite inside side of the car is used as an antenna. There is also a tendency to use devices that supply power through capacitive coupling.

Furthermore, high-mounted stop lamps, which are legally required to be installed in North America and elsewhere, are sometimes installed directly on the inside side of the window glass.

In either case, 6
A space of 0 to 2001 squares is required, and when a glass antenna is provided in the heating strip margin, a reduction in reception gain is unavoidable.

``Object of the Invention'' The present invention has been made in view of the above points, and even if it is provided in a limited space in the upper margin of the heating line on the rear window glass, it will not be possible to transmit FM radio broadcast waves to TV broadcast waves. It is an object of the present invention to provide a glass antenna for a vehicle that has improved reception gain in a very wide frequency band up to the UHF band.

:Means for solving the problem: The present invention provides a glass antenna provided in the margin above the heating line of the rear window glass for a vehicle, the length of which is 500 m to 1.
．． A king element is provided in which at least one end of two horizontal lines of 050 m is closed, and two vertical lines are connected near the center of the upper horizontal line of the element with a distance of 100 to 200 tml [separated from each other, and further connected to each other on one side. A first auxiliary element and a second auxiliary element having at least an inverted shape extending horizontally toward one side part and the other side part are provided, and power is supplied at the one side part. If an L-shaped or U-shaped impedance adjustment element is added to the first auxiliary element, a glass antenna that is more preferable depending on the vehicle type can be provided.

[Function] The present inventors have discovered that an element with at least one end closed of two horizontal wires with a length of 500 to 1.050 vm provided in the margin above the heating wire of a rear window glass for an automobile is capable of transmitting FM radio broadcast waves. It has a high gain over a wide band from 100 to TV broadcast waves, and acts as a main antenna.
~200 m [first auxiliary element and second auxiliary element connected at a distance and having at least an inverted shape extending horizontally toward one side and the other side, respectively; It has been discovered that the receiving gain can be improved by improving directivity characteristics or acting as an auxiliary antenna to adjust impedance, and by adding an L-shaped or U-shaped element to the first auxiliary element. Then, depending on the vehicle type, the impedance is adjusted and the reception gain is further improved.

[Example] 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 U-shaped single pane glass is attached to the rear window glass of an automobile, and as shown in FIG. 3, a main element 4 with two horizontal wires closed at both ends, a first auxiliary element 5 and a second auxiliary element 6 in the shape of an inverted letter are placed in the upper margin of the heating wire along with a power supply point 7, and conductive paste is screened. Formed by printing and firing.

In the vehicle glass antenna thus obtained, the dimensions of each part were A L = 1.280 m, A 2
=1.080 =, B=760m, C=900m,
D = 40 m, E t = 400 W, F s =
45M, Ez=400m, F2-451, G=200
w, H = 50 So, t = 25 cranes, 7
6MHz ~ 90MI (domestic FM radio broadcast waves of 88
AHz ~108MHz North American FM radio broadcast waves, 1~
TV broadcast wave VHF band in 12 channels, 470M
The average reception gain in the horizontal polarization of the UHF band of TV broadcast waves from H2 to 770MH2 is measured and expressed as the gain difference (hereinafter abbreviated as the Goupole ratio) when the reception gain of a standard dipole antenna is set to OdB. -19, respectively.
0dB, -15.9dB, -20.1dB, 18.8d
B, and the average reception gain of conventional glass antennas for vehicles that are in practical use is approximately -20 dB.
, approximately -19 dB, approximately -20 dB, and approximately -19 dB, which exceeds the antenna in most bands, indicating that it is an excellent antenna.

In addition, this glass antenna has 60 mm in the upper margin of the heating line.
It has a space S larger than a square angle, and a pedestal for holding a car phone antenna, a high-mounted stop lamp, etc. can be attached to the cough part.

In the second embodiment shown in FIG. 2, a U-shaped impedance adjustment element 8 is added to the first auxiliary element 5, and
The structure and dimensions were the same as in Example 1 except that K = 300 mm and K = 30 cranes.

With such a glass antenna for vehicles, domestic FM radio broadcast waves, North American FM radio broadcast waves, TV broadcast waves VHF
When measuring the average receiving gain in the horizontally polarized waves of the UHF band and TV broadcast wave UHF band and expressing it as a dipole ratio, it is -18, respectively.
, 8dB -15, 6dB, 19.0clB, -1
The result was 8.4 dB, which was a better result than in Example 1.

Embodiment 3 shown in Fig. 3 Open one end of element 4, C = 850 wm, F 1 = F 2 = 60 m, D
-30 Tsuru (H=45wm)), and furthermore, an L-shaped impedance adjustment element 8 is added to the first auxiliary element 5, and a third auxiliary element 9 is added, L = 400 M, M = The structure and dimensions were the same as in Example 1 except that the length was 30 m.

With such a glass antenna for vehicles, domestic FM radio broadcast waves, North American FM radio broadcast waves, TV broadcast waves VHF
When measuring the average receiving gain in the horizontally polarized waves of the UHF band and TV broadcast wave UHF band and expressing it as a dipole ratio, it is -17, respectively.
,6B ,-16,6dB,-196dB,-17,1
dB, and a good result equivalent to or better than that of Example 1 was obtained.

1) Nine (Embodiment 4 shown in FIG. 4 closes the other end of the main element 4,
The loop is closed, and the second auxiliary element 6 is further extended vertically and horizontally, N = 125 m, O = 500
The configuration and dimensions are the same as in Example 3 except that the open portion of the impedance adjustment element 8 is extended and connected to form a closed loop with the first auxiliary element.

With such a glass antenna for vehicles, domestic FM radio broadcast waves, North American FM radio broadcast waves, TV broadcast waves VHF
When measuring the average receiving gain in the horizontally polarized waves of the UHF band and TV broadcast wave UHF band and expressing it as a dipole ratio, it is -18, respectively.
, OB , -14,2dB, -18dB, -16,6d
B, which exceeded Example 1.2 in all bands, giving a good result.

In the fifth embodiment shown in FIG. 5, the main element 4 is C=920.
The configuration and dimensions were the same as in Example 4 except that a third auxiliary element of 1° was added to set P=400 mm and Q=125 mm.

With such a glass antenna for vehicles, domestic FM radio broadcast waves, North American FM radio broadcast waves, TV broadcast waves VHF
When measuring the average reception gain in the horizontally polarized waves of the HF band and TV broadcast waves, and expressing it as the Goupole ratio, it is -19, respectively.
, 2dB -14, 4dB, 19.6dB, -18
, 6 dB, which is a result that almost exceeds that of Example 1.

Example 6, Example 7 In Example 6 shown in FIG. 6, the impedance adjustment element 8 is modified and the third auxiliary element 1). In the seventh embodiment shown in FIG. 7, the opening part of the king element 4 is reversed from that of the third embodiment, and the impedance adjustment element 8 added to the first auxiliary element is made into a straight line shape. The tip of the second auxiliary element 6 was bent and an inverted T-shaped auxiliary element 13 was added, and results equivalent to those of Example 2 were 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 king element, the length C of the two horizontal filaments may be appropriately selected in the range of 500 to 1.050 m, preferably in the range of 600 to 1,000 m. The vertical length D is 10 to 60 mm, preferably 20 to 40 mm.
Tsuru's range is good. Further, whether one end is open or both ends are closed to form a closed loop may be appropriately selected depending on the vehicle type.

For the first auxiliary element, the horizontal length E is 200
~50Q, w-1 preferably ranges from 300 to 400 tm, and the vertical length Fl is from 30 to 80 tm, preferably 40
It may be selected as appropriate within the range of ~60■.

For the second auxiliary element, the horizontal length F2 is 200
~500 fl, preferably 300-400 tm, with vertical length F2 of 30-800, preferably 40-6
It may be selected as appropriate within the range of 0 days.

The distance between the vertical lines of the first and second auxiliary elements is required to be at least 100W to 150W as a space, but if it is too large, the reception gain will decrease, so it is preferably in the range of 250W or less, preferably 200FI or less.

Regarding the impedance adjustment element, it is not necessarily necessary, but it is usually preferable to provide it. In this case, the shape is L-shape, U-shape, linear shape (including one with a bent tip) = T Various shapes such as character shapes can be adopted by adjusting the length etc.

As for the third auxiliary element, it is not necessary, but various auxiliary elements can be added for the purpose of impedance adjustment, directivity improvement, broadband improvement, capacitive coupling with the heating wire, etc. .

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 pole 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 J The glass antenna of the present invention combines a main element having two horizontal lines of a specific length with at least one end closed, and a first auxiliary element and a second auxiliary element each having an inverted letter shape. Despite the locational constraint that requires space in the center above the heating strip,
76MHz from radio broadcast waves to TV broadcast UHF band
This has the effect of significantly improving reception gain in a very wide frequency band of up to 770 MHz.

[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 3... Bus bar 5... First auxiliary element... Second auxiliary element 7... Power feeding point 2... Anti-fog heating strip 4... Main element Element 8... Impedance adjustment element 9 to 13... Third auxiliary element Figure 1 Figure 3 Section 4

Claims (2)

[Claims] (1) In the glass antenna provided in the margin above the heating line of the rear window glass for a vehicle, the length is 500 mm to 1.
A main element is provided in which at least one end of two horizontal lines of 0.050 mm is closed, and two vertical lines are connected near the center of the upper horizontal line of the element with a distance of 100 to 200 mm, and one side portion of each is connected. A first auxiliary element and a second auxiliary element each having at least an inverted L shape extending horizontally toward the other side part are provided, and power is supplied at the one side part. A glass antenna for vehicles. (2) The glass antenna for a vehicle according to claim 1, wherein an L-shaped or U-shaped impedance adjustment element is added to the first auxiliary element.