JP2001160707A - Glass antenna coping with three bands for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass antenna for automobile coping with three bands capable of suppressing a cost at the time of equipping the automobile with the glass antenna for receiving the radio broadcasting of the plural bands and performing balanced tuning for the respective bands. SOLUTION: Relating to this glass antenna attached to the rear glass 1 of the automobile, on the rear glass 1, an antenna conductor A1 for FM is arranged at the top part, the antenna conductor A2 for WB is arranged at the lower part of the antenna conductor A1 for FM and the antenna conductor A3 for AM is arranged so as to occupy the part of the rear glass 1 at the lower part of the antenna conductor A2 for WB.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to FM, AM, W
The present invention relates to a glass antenna for an automobile capable of receiving B (weather band) radio broadcasting.

[0002]

In an area where a plurality of bands of radio broadcasting are performed, it is necessary to mount an antenna corresponding to each band on a vehicle body in order to receive these broadcasts on a vehicle-mounted radio. is there. For example, in a region such as North America, FM / AM / WB radio broadcasting of three bands is performed, and when an attempt is made to receive radio broadcasting of these bands by an on-board radio of a car traveling in such a region, FM broadcasting is performed. Antennas corresponding to each band of / AM / WB are required.

Here, the WB (weather band) radio broadcast is a radio broadcast for specially broadcasting a weather forecast near a certain local area, and many radio broadcasts are provided so as to cover almost the entire United States at present.

In general, a rod-type antenna is often used as an antenna for an on-vehicle radio. However, in recent years, in order to increase the degree of freedom in the design of a vehicle body or to prevent the rod antenna from breaking or wind noise, the body of the vehicle is often used. An increasing number of cases are equipped with a glass antenna in which an antenna wire is printed on a window glass.

[0005] Such a glass antenna usually has lower sensitivity than a rod-type antenna. Therefore, when a glass antenna is installed in an automobile, an amplifier is connected between the glass antenna and a vehicle-mounted radio. In many cases, the sensitivity is reduced.

However, when attempting to receive radio broadcasts of a plurality of different bands as described above using an in-vehicle radio, connecting amplifiers to the glass antennas for each band would greatly increase the cost of installing the in-vehicle radio. The problem that it will take place occurs.

Further, when a common amplifier is connected to the glass antenna of each band, if the transmission output of the radio broadcast in each band is different and a large difference is generated in the electric field strength of each band, each band has its own antenna. There arises a problem that it is difficult to perform balanced tuning.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in a glass antenna for an automobile for receiving a plurality of bands of radio broadcasts through a vehicle-mounted radio. That is, the present invention can reduce the cost of installing a glass antenna for receiving radio broadcasts of a plurality of bands in an automobile, and
It is an object of the present invention to provide a three-band automotive glass antenna capable of performing balanced tuning for each band.

[0009]

According to a first aspect of the present invention, there is provided a three-band glass antenna for a vehicle, wherein the glass antenna is mounted on a window glass of a vehicle. , An FM antenna conductor is arranged below the FM antenna conductor, and a WB antenna conductor is arranged below the FM antenna conductor, and an AM antenna conductor is arranged so as to occupy a window glass portion below the WB antenna conductor. It is characterized by:

In the three-band automotive glass antenna according to the first aspect of the present invention, the FM antenna conductor is disposed at the top of a window glass having the highest ground height at which the reception sensitivity is improved, thereby providing a radio. Sufficient reception sensitivity can be ensured in the receiver, which eliminates the need for connection of amplifying means, and further, by eliminating the need for this amplifying means, excessive amplification of FM broadcast waves in a strong electric field area. , It is possible to prevent the occurrence of distortion of the FM sound due to the above.

The WB antenna conductor is arranged at the next higher position than the FM antenna conductor on the window glass, so that the reception sensitivity is improved. The AM antenna conductor occupies most of the area of the window glass other than the FM antenna and WB antenna conductors, thereby increasing the reception performance of the antenna. Since a sufficient installation area can be ensured, sufficient reception sensitivity in the radio receiver is ensured, and the connection of the amplifying means becomes unnecessary.

As described above, according to the first aspect,
Since the connection of the amplifying means to the FM antenna conductor and the AM antenna conductor can be eliminated, the product cost can be reduced, and a well-tuned tuning corresponding to each broadcasting frequency band in the radio receiver can be achieved. It is possible to do.

According to a third aspect of the present invention, in order to achieve the above object, in addition to the configuration of the first aspect, the AM antenna conductor also serves as a heater wire of the defogger. It is characterized by having.

According to the three-band glass antenna for automobiles according to the second aspect of the present invention, the AM antenna antenna conductor and the heater wire of the defogger covering most of the window glass are commonly used, so that a sufficient AM antenna is provided. The installation area of the antenna conductor can be secured, and the product cost can be reduced.

According to a third aspect of the present invention, in order to achieve the above object, a three-band glass antenna for a vehicle according to the present invention, in addition to the configuration of the first aspect, further comprises the FM antenna conductor and the AM antenna.
The antenna conductor is connected to a radio receiver via a matching circuit, and the WB antenna conductor is connected to the radio receiver via amplifying means.

In the three-band automotive glass antenna according to the third aspect of the present invention, the FM antenna conductor is disposed at the top of the window glass having the highest ground height, so that sufficient reception sensitivity can be ensured. The FM broadcast signal received by the FM antenna conductor is input to the radio receiver only by the matching processing by the matching circuit.

Regarding WB broadcasting, even when the electric field strength is small, the W signal received by the WB antenna conductor
Since the B broadcast signal is amplified by the amplifying means and input to the radio receiver, necessary reception sensitivity in the radio receiver is ensured. With respect to the AM broadcast, the installation area that greatly affects the reception performance is sufficiently secured, so that the AM broadcast signal received by the AM antenna conductor is input to the radio receiver only by the matching processing by the matching circuit. .

As described above, according to the third aspect,
Since the amplifying means is connected only to the WB antenna conductor,
The product cost can be reduced, and the radio receiver can perform well-tuned tuning corresponding to each broadcast frequency band.

According to a fourth aspect of the present invention, in order to achieve the above object, a three-band glass antenna for a vehicle further comprises, in addition to the configuration of the first aspect, the AM antenna conductor and WB.
Only the antenna conductors are connected to the radio receiver via the amplifying means.

In the three-band automotive glass antenna according to the fourth aspect of the present invention, the FM antenna conductor is disposed at the top of the window glass having the highest ground height, so that sufficient reception sensitivity can be secured. The FM broadcast signal as received at the FM antenna conductor is input to the radio receiver.

Regarding WB broadcasting, even when the electric field strength is low, the W signal received by the WB antenna conductor is received.
Since the B broadcast signal is amplified by the amplifying means and input to the radio receiver, necessary reception sensitivity in the radio receiver is ensured.

Regarding the AM broadcast, even if the installation area that greatly affects the reception performance of the AM antenna conductor cannot be sufficiently secured due to the small window glass, the AM broadcast signal received by the AM antenna conductor cannot be secured. Since the signal is amplified by the amplifying means and input to the radio receiver, necessary reception sensitivity in the radio receiver is ensured.

As described above, according to the fourth aspect,
Since it is not necessary to connect the amplifying means to the FM antenna conductor, the product cost can be reduced, and the radio receiver can perform well-tuned tuning corresponding to each broadcast frequency band. .

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a configuration diagram showing an example of an embodiment of a 3-band glass antenna for automobiles according to the present invention. The glass antenna in FIG.
It is configured to correspond to three bands of B / AM.

In FIG. 1, a rear glass 1 of an automobile is shown.
A single FM antenna conductor A1 is printed and printed so as to extend laterally along the upper edge of the rear glass 1,
Further, a WB antenna conductor A2 is disposed below the FM antenna conductor A1 by printing and printing.

The WB antenna conductor A2 has its left end folded back so as to form a double line at the center of the rear glass 1, and as shown in the figure, is located above the center in the vertical direction of the rear glass 1. I have. The rear glass 1 further includes an antenna conductor A for WB.
The antenna antenna A3 for AM is printed and printed on a portion occupying the lower portion of the rear glass 2 (in this example, a portion occupying approximately three quarters of the area of the rear glass 1).

The AM antenna conductor A3 is also used as a rear defogger, and bus bars A3b and A3c in which a plurality of conductors A3a serving also as an antenna wire and a heater wire are vertically embedded on both sides of the rear glass 1. In between, they are stretched so as to extend parallel to each other in the width direction. The FM antenna conductor A1, the WB antenna conductor A2, and the AM antenna conductor A3 are connected to a radio receiver 3 via an antenna connection circuit 2.

FIG. 2 is a circuit diagram showing an example of the antenna connection circuit 2. As shown in FIG. 2, the antenna connection circuit 2 includes an input terminal c1 to which the FM antenna conductor A1 is connected, an input terminal c2 to which the AM antenna conductor A3 is connected, and an input terminal to which the WB antenna conductor A2 is connected. c3 and an output terminal c4 connected to the radio receiver 3
And

The matching circuit 2A is connected between the input terminal c1 and the output terminal c4 of the antenna connection circuit 2.
Is connected, and the FM broadcast signal received by the FM antenna conductor A1 is output from the output terminal c4 to the radio receiver 3 via the matching circuit 2A.

An input circuit 2B is connected to the input terminal c2, and an AM band-pass circuit 2C is connected between the input circuit 2B and the above-mentioned matching circuit 2A, and is received by the AM antenna conductor A3. The AM broadcast signal is input to an input circuit 2B and an AM bandpass circuit 2C.
Through the matching circuit 2A, and output from the output terminal c4 to the radio receiver 3 via the matching circuit 2A.

An input circuit 2D is connected to the input terminal c3, and the W / B band amplifier 2 is connected to the input circuit 2D.
E, and an output circuit 2F is connected between the W / B band amplifier 2E and the output terminal c4, and the WB received by the WB antenna conductor A2.
The broadcast signal is output from the output terminal c4 to the radio receiver 3 via the input circuit 2D, the W / B band amplifier 2E, and the output circuit 2F.

The above three-band glass antenna for automobiles is preferably used under the following broadcasting environment and vehicle body conditions. That is, in the broadcasting environment, the electric field strength of FM broadcasting is strong, and each broadcasting station deepens the modulation in order to improve the sound quality of its own broadcasting.
For broadcasting, when the electric field strength is small, and for the vehicle body condition, it is used when the area of the rear glass of the automobile to which the glass antenna is attached is large and the area occupied by the AM antenna conductor A3 can be secured large. preferable.

Under the above broadcasting environment, FM
The antenna conductor A1 is arranged at the uppermost part of the rear glass 1 having the highest ground height at which the reception sensitivity is highest, so that sufficient reception sensitivity can be ensured in the radio receiver 3 and, thereby, amplification is achieved. This eliminates the need for connection of the amplifier and eliminates the need for the amplifier, thereby preventing the occurrence of distortion of FM audio due to amplifying the FM broadcast signal in a strong electric field region.

The WB antenna conductor A2 is arranged at the next position higher than the FM antenna conductor A1 on the rear glass 1, and the WB antenna conductor A2
Since the / B band amplifier 2E is connected, for example, WB broadcasting is performed by narrow FM modulation such as a 25 kHz step and the like. Even when the modulation is shallow, the required reception sensitivity in the radio receiver 3 is ensured.

For the AM antenna conductor A3, the installation area greatly affects the reception performance of the rear glass of an automobile whose ground height is not greatly different, but is also used as a rear defogger that covers most of the rear glass 1. Therefore, if the rear glass 1 is used under a vehicle body condition in which the area is large, sufficient reception sensitivity in the radio receiver 3 is secured, and connection of an amplifier is not required.

That is, in the above-described three-band glass antenna for automobiles, the FM broadcast signal received by the FM antenna conductor A 1 is transmitted to the input terminal c of the antenna connection circuit 2.
1 to the matching circuit 2A and the radio receiver 3
Is output from the output terminal c4 to the radio receiver 3.

An AM broadcast signal received by the AM antenna conductor A3 is supplied to an input terminal c2 of the antenna connection circuit 2.
Are input to the input circuit 2B, and after the signals other than the desired frequency band are attenuated in the input circuit 2B,
A is input to the M band pass circuit 2C, and A
M broadcast signals are extracted. The AM broadcast signal output from the AM bandpass circuit 2C is
After matching with the radio receiver 3 is performed at A, the signal is output from the output terminal c4 to the radio receiver 3.

The WB broadcast signal received by the WB antenna conductor A2 is supplied to an input terminal c3 of the antenna connection circuit 2.
Are input to the input circuit 2D, signals in the input circuit 2D other than the desired frequency band are attenuated, and then amplified by the W / B band amplifier 2E. And W
The WB broadcast signal output from the / B band amplifier 2E is output from the output terminal c4 to the radio receiver 3 after matching with the high frequency amplifier circuit and the frequency conversion circuit of the radio receiver 3 in the output circuit 2F. Is done.

As described above, according to the three-band glass antenna for automobiles, since the amplifier is connected only to the antenna conductor A2 for WB, the product cost can be suppressed and the radio receiver 3 can be used for each antenna. A well-balanced tuning corresponding to the broadcast frequency band can be performed.

FIG. 3 is a circuit diagram showing another example of the configuration of the antenna connection circuit 2. In FIG. 3, the antenna connection circuit 2 'is similar to the antenna connection circuit 2 of FIG.
An input terminal c1 'to which the M antenna conductor A1 is connected;
Input terminal c2 'to which AM antenna conductor A3 is connected
And an input terminal c to which the WB antenna conductor A2 is connected
3 ′ and an output terminal c 4 ′ connected to the radio receiver 3.

The input terminal c1 'of the antenna connection circuit 2 is directly connected to the output terminal c4', and the FM broadcast signal received by the FM antenna conductor A1 is transmitted from the output terminal c4 'to the radio receiver 3 Is output to

An input circuit 2A 'is connected to the input terminal c2', and an AM band amplifier 2 is connected to the input circuit 2A '.
B ″ is connected, and an output circuit 2C ′ is connected between the AM band amplifier 2B ′ and the output terminal c4 ′, and the AM broadcast signal received by the AM antenna conductor A3 is input to the The signal is output from the output terminal c4 'to the radio receiver 3 via the circuit 2A', the AM band amplifier 2B ', and the output circuit 2C'.

The input terminal c3 'is connected to an input circuit 2D', the input circuit 2D 'is connected to a W / B band amplifier 2E', and the W / B band amplifier 2E 'is connected to an output. Output circuit 2 between the terminal c4 '
F ′ is connected and the WB broadcast wave received by the WB antenna conductor A2 is input to the input circuit 2D ′ and W /
The signal is output from the output terminal c4 to the radio receiver 3 via the B-band amplifier 2E 'and the output circuit 2F'.

The glass antenna corresponding to the three bands for an automobile in the example of FIG. 3 has a broadcasting environment in which the electric field strength is high for the FM broadcast and small for the WB broadcast, as in the case of the above-described example of FIG. It is preferable that the rear glass 1 is used under vehicle conditions where it is difficult to secure a sufficient installation area for the AM antenna conductor A3.

That is, in the broadcasting environment where the electric field strength of FM broadcasting is strong as described above, the FM antenna conductor A1 is placed on the rear glass 1 having the highest ground height at which the reception sensitivity is highest and the FM antenna conductor A1 is highest. By arranging it on the upper part, a sufficient receiving sensitivity can be secured in the radio receiver 3, so that it is not necessary to connect an amplifier, and the input terminal c is connected to the antenna connection circuit 2 '.
FM from FM antenna conductor A1 input from 1 '
The broadcast signal is directly output from the output terminal c4 'to the radio receiver 3.

With respect to the AM antenna conductor A3, since the area of the rear glass 1 is small, it is not possible to secure a sufficient installation area for determining the receiving sensitivity, so that the received AM broadcast signal is amplified by the amplifier. Will be That is, the AM broadcast signal received by the AM antenna conductor A3 is input from the input terminal c2 'of the antenna connection circuit 2' to the input circuit 2A '.
After the signal outside the desired frequency band is attenuated at A ', it is amplified by the AM band amplifier 2B'.

The AM broadcast signal output from the AM band amplifier 2B 'is subjected to matching with the high frequency amplifier circuit and the frequency conversion circuit of the radio receiver 3 in the output circuit 2C', and then to the output terminal c4 '. From radio receiver 3
Is output to

FIG. 2 shows the WB antenna conductor A2.
Similarly to the antenna connection circuit 2, the W / B band amplifier 2E 'amplifies the received WB broadcast signal. That is, the WB broadcast signal received by the WB antenna conductor A2 is input from the input terminal c3 ′ of the antenna connection circuit 2 to the W / B band amplifier 2E ′ via the input circuit 2D ′, and the W / B band After being amplified by the amplifier 2E ', it is output from the output terminal c4' to the radio receiver 3 via the output circuit 2F '.

As described above, according to the above-described three-band glass antenna for automobiles, it is not necessary to connect an amplifier to the FM antenna conductor A1, so that the product cost can be reduced and the radio receiver 3 can be used. It is possible to perform well-tuned tuning corresponding to each broadcast frequency band.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example according to an embodiment of the present invention.

FIG. 2 is a circuit configuration diagram illustrating an example of an antenna connection circuit according to the embodiment of the present invention.

FIG. 3 is a circuit configuration diagram showing another example of the antenna connection circuit according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rear glass (window glass) 2, 2 '... Antenna connection circuit 2A ... Matching circuit 2A' ... Input circuit 2B ... Input circuit 2B '... AM band amplifier (amplifying means) 2C ... AM bandpass circuit 2C' ... Output circuit 2D, 2D '... input circuit 2E, 2E' ... W / B band amplifier (amplifying means) 2F, 2F '... output circuit 3 ... radio receiver A1 ... FM antenna conductor A2 ... WB antenna conductor A3 ... AM Antenna conductor

Claims (4)

[Claims] 1. A glass antenna mounted on a window glass of an automobile, wherein an FM antenna conductor is disposed on the top of the window glass, and a WB antenna conductor is disposed below the FM antenna conductor. A three-band glass antenna for an automobile, wherein an AM antenna conductor is arranged so as to occupy a window glass portion below a WB antenna conductor. 2. The three-band glass antenna for an automobile according to claim 1, wherein the AM antenna conductor is also used as a heater wire of a defogger. 3. The antenna conductor for FM and the antenna conductor for AM are connected to a radio receiver via a matching circuit, and the antenna conductor for WB is connected to a radio receiver via amplifying means. 3. A three-band glass antenna for a vehicle according to claim 1. 4. The glass antenna according to claim 1, wherein only the AM antenna conductor and the WB antenna conductor are connected to a radio receiver via amplifying means.