JPH03198504A - Glass antenna for vehicle - Google Patents

Abstract

PURPOSE:To obtain a high reception gain to each broadcast of AM, FM radio wave and TV by arranging a 1st antenna prolonged from an upper side of a rear window glass for vehicle in the vicinity of the lowermost part of heating wires along both sides and a 2nd antenna prolonged in the horizontal direction between the 1st antenna and the heating wires. CONSTITUTION:A 1st antenna 4 prolonged from a window glass upper side to a lower side along both sides together with a defogging heater wire 2 and a bus bar 3 in the inside of the cabin of a plate glass 1 of a rear window of an automobile, a vertical wire 7 having a feeder 6 at its upper part to connect the antenna 4 and the heater wire 2 via a folded part 5 and a 2nd antenna 8 having a couple of left right folded part connecting to the vertical wire 7 are formed. The heater wire acts like a main antenna and the 1st antenna acts like an auxiliary antenna at the reception of an AM radio broadcast wave. The 1st antenna acts like a main antenna and the heater wire acts like an auxiliary antenna at the reception of FM radio broadcast wave or TV broadcast wave, the 2nd antenna and the folded part are used to adjust the impedance and the feeding point is provided in the middle of the upper side to improve the gain further.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a glass antenna provided on the rear window glass of a vehicle such as an automobile, and particularly to a glass antenna suitable for receiving AM broadcast waves and F'M radio broadcast waves. Regarding.

[Prior art 1] In recent years, various glass antennas for vehicles that are equivalent to ball antennas have been proposed for capturing radio broadcast waves such as AM and FM, and have been put into practical use. It was difficult to obtain in the rear window glass.

[Object of the invention] The present invention has been made in view of the above points, and
It has a particularly high reception gain for radio broadcast waves such as M and FM, and can be used alone in place of the conventionally used ball antenna.
The reception gain is high even for the AM radio broadcast waves, and the T
The purpose of the present invention is to provide a glass antenna for vehicles that has improved reception gain in a very wide frequency band from V broadcast waves to the U HF band.

[Means for Solving the Problems] The present invention provides a glass antenna in which a filament antenna is provided along with an anti-fogging heating filament on a rear window glass for a vehicle. a first antenna extending to near the bottom of the strip; and a first antenna located between the first antenna and the heating strip, having a folded portion on at least one side portion, and extending horizontally to the other side portion. 2 antennas are arranged, the first antenna and the heating filament are connected directly or through a folded part by a vertical filament disposed in the center, and the second antenna is connected to the vertical filament. In addition to the connection, the power feeding part is disposed above the heating filament and is drawn out from the vertical filament or the first antenna.

[Function 1] In the present invention, when receiving AM radio broadcast waves, the heating filament acts as a main antenna, and the first antenna extending from the top side of the window glass to both sides at least to the vicinity of the bottom of the heating filament further improves the gain. Acts as an auxiliary antenna.

When receiving FM radio broadcast waves or TV broadcast waves, the first antenna acts as a main antenna, the heating wire acts as an auxiliary antenna, and has a folded part on at least one side part and a folded part on the other side part. The second antenna extending in the horizontal direction and the bent portion adjust the impedance, and by providing the feeding point at the center of the upper side, the gain is further improved.

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

1 to 4 are front views showing Embodiments 1 to 4, respectively, in which the glass antenna of the present invention is provided on a rear window glass for an automobile.

F Example 1] As shown in Fig. 1, this is an example in which a single pane of glass is installed as a rear window of an automobile, and anti-fogging heating wires 2.2...2, bus bars 3. 3, a first antenna 4 extending from the top side of the window glass along both sides and further extending to the bottom side; this first antenna 4 and the heating wire 2;
, a vertical filament 7 having a feeding part 6 on the upper part for connection via a folded part 5, and a second antenna 8 having a pair of left and right folded parts connected to the vertical filament 7 are screened with conductive paste. Formed by printing and firing.

In such a glass antenna for a vehicle, the dimensions of each part are A s = 900 m, A2~1,110 m, B-
535 Kasumi■, C=425tm, D=410fi, E=1
80fi, F l = F2 = 340 Tsuru, G 1 =
G2=430w, H-20m, I=20
0 tx,, J = 10m, K = 320m, -30■
1, M=5as, N=5tm, O=25tm1P=80
mm, Q = +5 fl, R = 15 fl, measure the average reception gain for AM radio broadcast waves of 530 KHz ~ 1, 600 Kllz, FM radio broadcast waves of 76 MHz - 108 MHz, and calculate the average reception gain for a 1 m long front pillar antenna. The gain difference (hereinafter abbreviated as pillar antenna ratio) when the reception gain of the antenna is OdB is 6 dB and +0.2 dB, respectively, which are better results than the pillar antenna. .

In addition, TV broadcast waves in the VHF band for channels 1 to 12, TV broadcast waves in the 470 MHz to 770 MHz UHF band
When the average reception gain for each band is measured and expressed as a gain difference (hereinafter abbreviated as dipole ratio) when the reception gain of a standard dipole antenna is set to OdB, it is -i8.
．． 2 dB, -17, 6 dB, and the receiving gain of a conventional glass antenna which is good is about -20 dB, about -18 dB, so it can be seen that it is an excellent antenna.

As shown in Fig. 2, the length of the lower horizontal part of the first antenna 4 is changed, the second antenna 8 is folded back twice, and the shape of the bent part 5 is changed so that E=720+n, F l =
F2' = 410 m, F3 = F4
=400 am, H+= H2= 2O
N, I = 160tm, J = 10fl, P
The structure and dimensions were the same as in Example I except that = 100 lids ■ and Q = lOtm.

With such a vehicle glass antenna, 530KH
z-1,600KHz AM radio broadcast wave, 76MHz
When the average reception gain for FM radio broadcast waves of ~108M1lz is measured and expressed as a pillar antenna ratio, it is +4.8 dB and +0.1 dB, respectively. TV broadcast waves VHF band in channels 1 to 12, 470M) Iz ~
When the average reception gain for the 770MHz TV broadcast wave UHF band is measured and expressed in Gouibor ratio, it is -18 respectively.
, 6 dB, and 17.8 dB, indicating that the antenna is as excellent as Example 1.

As shown in Figure 3, the lower horizontal part of the first antenna 4 is removed, one end of the second antenna 8 is left open, the shape of the bent part 5 is changed, and the position of the power feeding part 6 is changed. and added an auxiliary antenna 9, 11-350 irises, ■
□ -420 torture-, 5=370 Naoma, T=
The structure and dimensions were the same as in Example 1 except that the volume was 400 ml and tJ = 20 mm.

With such a vehicle glass antenna, 530KH
z -1, 600KHz AM radio broadcast wave, 76Mf
lz -108) When the average reception gain for 4Hz FM radio broadcast waves is measured and expressed as a pillar antenna ratio, it is +4.5 dB and +0.2 dB, respectively.
When the average reception gain for the UHF band of TV broadcast waves from z to 770M1lz was measured and expressed as a Gouibor ratio, they were -18, 2 dB, and 17.9 dB, respectively, indicating that the antenna is as excellent as Example 1.

As shown in FIG. 4, the lower horizontal part of the first antenna 4 is removed, one end of the second antenna 8 is left open, and the vertical wire 7 directly connects the first antenna 4 and the heating wire. 2, the feed section 6 is arranged on the upper side, and an auxiliary antenna 10 is added.Although the reception gain is slightly lower than in Examples 1 to 3, it is sufficient for practical use. I can offer it.

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 first antenna, if the tip portion extends to the vicinity of the lowest part of the heating filament as in Examples 3 and 4, the lower horizontal portion may not necessarily be provided, but it is more preferable to provide it.

Regarding the second antenna, whether to fold only one end or both ends, how many times to fold it back, and contrary to each embodiment, whether to fold it downward is determined when receiving FM radio broadcast waves and TV broadcast waves. , has a large effect on the gain, so the optimal shape must be selected depending on the vehicle type.

Regarding the auxiliary antenna, depending on the vehicle model, the L-shaped or T-shaped antenna shown in Example 3 may be used as the first antenna, and one horizontal line with an open or folded tip may be used, although this is not necessarily an essential requirement. ~ Three vertical filaments may be provided so as to be connected to each other.

When receiving FM radio broadcast waves or TV broadcast waves, the impedance of the bent portion changes depending on its shape and length, so it may be adjusted as appropriate. In this case, the connection position with the heating filament can also be changed from the center to the side.

It is preferable to provide the power feeding section at the center above the heating line because the reception gain will be high, but it may also be provided at the upper side, although the gain will be slightly lower due to wiring reasons.

Regarding diversity reception, it is more preferable to perform diversity reception with the glass antenna of the present invention, such as an antenna separately provided in the margin below the heating line, a glass antenna provided on the front window glass, or a ball antenna.

[Effects of the Invention] The glass antenna of the present invention has conventionally been used in combination with a ball antenna, etc., and it has been difficult to put it to practical use alone. In addition to making it possible to receive
High reception gain can also be obtained for broadcast waves.

[Brief explanation of drawings]

1 to 4 are front views showing Embodiments 1 to 4, respectively, in which the glass antenna of the present invention is provided on a rear window glass for an automobile. ■... Plate glass 2... Heating filament 3... Bus bar 5... Bending portion 7... Vertical filament 9... Auxiliary antenna 4... First antenna 6... Power feeding part 8 ...Second antenna

Claims (1)

[Claims] A glass antenna in which a filament antenna is provided along with an anti-fog heating filament on a rear window glass for a vehicle, the first antenna extending from the top side of the window glass along both sides to at least the vicinity of the bottom of the heating filament; A second antenna is disposed between the first antenna and the heating filament, has a folded part on at least one side part, and extends horizontally to the other side part, and is arranged between the first antenna and the heating wire. The filaments are connected directly or through a folded part by a vertical filament disposed in the center, a second antenna is connected to the vertical filament, and a feeding part is placed above the heating filament. arranged,
A glass antenna for a vehicle, characterized in that it is drawn out from the vertical line or the first antenna.