JPH06318811A - Window glass antenna system - Google Patents

Abstract

PURPOSE:To obtain reception outputs of more number of kinds than an independent antenna number and to use an amplifier for the reception signal in common by combining two antennas or over. CONSTITUTION:A switch means 4 selecting a reception signal to each antenna corresponding to each of the plural antennas is provided between each of output terminals 5a, 6a of the plural antennas 5, 6 arranged to a window glass 2a and an input terminal of the amplifier 3. Then a single or combined reception signal to each antenna is fed to a receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention not only individually extracts the reception signals of a plurality of antennas arranged on the window glass of an automobile, but also combines the reception signals of two or more antennas.
The present invention relates to a window glass antenna device that is capable of obtaining received signals in multiple systems rather than the number of arranged antennas.

[0002]

2. Description of the Related Art A windowpane antenna device having a plurality of antennas on a windowpane of an automobile for performing spatial diversity reception is known. FIG. 8 is a schematic structural diagram of a conventional window glass antenna device for receiving television (TV) broadcasting.

In a conventional window glass antenna device 51, for example, four systems of TV receiving antennas 53 to 56 are arranged on a window glass 52 of an automobile, and a wide band amplifier 57 to 56 is provided for each TV receiving antenna 53 to 56. 60 is provided to supply the amplified TV reception signal to a TV receiver (not shown). The first and second TV antennas 53 and 54 are
The anti-fog heater wire is used as an antenna element.
Third and fourth TV antennas 55, 56 having different pattern shapes are provided on the lower side of the window glass 52. The antenna 61 disposed on the upper side of the window glass 52
Is for AM / FM broadcast reception.

[0004]

However, in the conventional window glass antenna device, since a plurality of antennas are arranged over almost the entire surface of the window glass, antennas for other applications, such as antennas for car telephones, etc. There is no space to install. Further, since each antenna is provided with a broadband amplifier, the antenna device becomes expensive and a space for mounting a plurality of amplifiers is required.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a window glass antenna device which secures a space for arranging an antenna for other uses and shares an amplifier. To aim.

[0006]

In order to solve the above-mentioned problems, a window glass antenna device according to the present invention is characterized in that, in claim 1, each antenna is provided corresponding to each of a plurality of antennas arranged on a window glass of an automobile. And a switch means for switching whether or not the reception signal of is input to the amplifier.

According to a second aspect of the present invention, there are two systems of antennas arranged on the window glass, first switch means for switching whether or not the reception signal of each antenna is input to the receiver side, and first switch means. And a second switch means for switching whether to input the received signal input to the antenna input terminal on the TV side or the antenna input terminal on the radio side.

[0008]

According to the invention of claim 1, if two antennas, for example, the antenna A and the antenna B are provided on the window glass and the switch means corresponding to each antenna is individually turned on, the antenna A or the antenna B can be turned on. The received signal is input to the amplifier. If the switch means corresponding to each of the antennas A and B is turned on at the same time, a composite signal of the antennas A and B can be obtained. Therefore, it is possible to obtain more kinds of received signals than the number of antennas arranged on the window glass. Further, since the input of the amplifier is switched, the amplifier can be shared.

According to the second aspect of the present invention, it is possible to configure two diversity antennas for TV and radio with only two systems of antennas.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the invention of claim 1 will be described.
FIG. 1 is an overall configuration diagram of a first embodiment of a window glass antenna device according to the present invention. This window glass antenna device 1
Is composed of an antenna-equipped window glass 2 in which a plurality of antennas are arranged on an automobile window glass 2a, and a switch means 4 for selecting a signal to be inputted to a wide band amplifier 3.

The window glass 2 with an antenna is a TV of two systems.
The antennas 5 and 6 for reception and the antenna 7 for AM / FM radio reception are provided. The first TV receiving antenna 5 is formed with a dedicated antenna pattern, and the second TV receiving antenna 6 uses an anti-fog heater wire 8.

Power supply terminal 5 of each TV receiving antenna 5, 6.
The received signals extracted from a and 6a are fed to the input terminals 4a and 4a of the switch means 4 via the power supply cables 5b and 6b.
4b.

The switch means 4 includes switching diodes D1 and D2 provided corresponding to the TV receiving antennas 5 and 6, and resistors R1 to R1 for supplying a direct current to the diodes D1 and D2. It is composed of R4 and DC blocking capacitors C1 to C4. Terminal 4c,
Reference numeral 4d is a switching control terminal.

Each of the resistors R1 to R4 is set to a high resistance value so as not to attenuate the received signal, and each of the capacitors C1 to C4.
Has a capacitance value set to have a sufficiently low impedance in the frequency band of the received signal.

The output 4e of the switch means 4 is supplied to the amplifier 3, and the reception signal amplified by this amplifier 3 is supplied to the TV receiver (not shown) via the DC blocking capacitor C5.

Next, the operation will be described. When a predetermined DC voltage is applied to the control terminal 4c of the switch means 4, the resistance R1-
A direct current flows through the diode D1-resistor R2, and the diode D1 becomes conductive. As a result, the reception signal of the first TV receiving antenna 5 applied to the input terminal 4a is input to the amplifier 3, and the amplified reception signal of the first TV receiving antenna 5 is supplied to the TV receiver. It

Similarly, when a predetermined DC voltage is applied to the control terminal 4d of the switch means 4, the resistor R3-diode D2 is applied.
A direct current flows through the resistor R4, the diode D2 becomes conductive, the reception signal of the second TV receiving antenna 6 is amplified by the amplifier 3, and is supplied to the TV receiver.

When a predetermined DC voltage is applied to both of the control terminals 4c and 4d, the reception signals of the first and second TV receiving antennas 5 and 6 are both supplied to the amplifier 3 and the two antennas 5 and 6 are supplied. A signal obtained by combining the received signals of 1 is supplied to the TV receiver. Therefore, in this embodiment, it is possible to obtain three types of received signals with two antennas.

When three systems of antennas A, B and C are provided, individual outputs of A, B and C, A + B, A + C,
Combined output of two antennas of B + C, A + B + C
It is possible to obtain a total of seven types of received signals of the combined output of the three systems.

Then, by selecting a combination of antennas that can be well received from a plurality of types of received signals,
Stable TV reception becomes possible.

Next, the invention of claim 2 will be described.
FIG. 2 is a schematic structural diagram of the second embodiment of the window glass antenna device according to the present invention. This window glass antenna device 11
Is provided with an inverted T-shaped antenna 12 arranged above the anti-fog heater wire 8 of the window glass 2a of the automobile, an antenna 13 also serving as the anti-fog heater wire, and these two systems of antennas 12 and 13. A first switch means 15 to be described later, which is connected to the window glass 14 with an antenna, the power supply terminal 12a of the inverted T-shaped antenna 12 and the power supply terminal 13a of the anti-fog heater wire / antenna 13 via a coaxial cable (not shown). And second switch means 16.

FIG. 3 is an overall circuit diagram of the antenna device 11. The inverted T-shaped antenna 12 is connected to the amplifier 17 via the switch circuit 15a. The anti-fog heater wire / antenna 13 is connected to the amplifier 18 via the switch circuit 15b. The switch circuits 15a and 15b constitute the first switch means 15, and the control signals S1 and S, respectively.
Controlled by 2. These control signals S1 and S2 are input from the diversity controller 31 described later.
Further, the output side (M) of the antenna 12 and the input side (M) of the diversity controller 31 are connected, and the antenna 1
The output side (N) of 3 and the input side (N) of the diversity controller 31 are connected.

The output side of the amplifier 17 is a changeover switch circuit 1
6a is connected to the input side, one output side of the switch circuit 16a is connected to the antenna terminal (not shown) of the TV 19, and the other output side is connected to the input side of the changeover switch circuit 20. The output side of the amplifier 18 is the changeover switch circuit 1
6b is connected to the input side, one output side of the switch circuit 16b is connected to the antenna terminal (not shown) of the TV 19, and the other output side is connected to one output side of the changeover switch circuit 20 and the FM radio (FM) 21. It is connected to an antenna terminal (not shown). The other output side of the changeover switch circuit 20 is connected to an antenna terminal (not shown) of an AM radio (AM) 22.

The switch circuits 16a and 16b are double switches and are controlled by a common control signal S3. The double switch constitutes the second switch means 16. On the other hand, the switch circuit 20 is controlled by the control signal S4. These control signals S3 and S4 are input from the TV / radio switching controller 32 described later.

FIG. 4 is a circuit diagram of an example of the switch circuits 15a and 15b. This switch circuit is, for example, a PIN
Although it is a known switching circuit composed of semiconductor elements such as diodes and transistors, in the present embodiment, it is composed of general diodes.

The switch circuits 15a and 15b are composed of a switching diode D11, resistors R11 and 12 for supplying a direct current to the diode D11, and DC blocking capacitors C11 and 12. Terminal 15h
Is an input terminal, the terminal 15i is an output terminal, and the terminal 15j is a switching control terminal. The control signals S1 and S2 are input to the control terminal 15j.

The resistors R11 and R12 are set to a high resistance value so as not to attenuate the received signal, and the capacitors C11 and
The capacitance value of 12 is set so that the impedance is sufficiently low in the frequency band of the received signal.

The switch circuits 15a and 15b receive the diode D when a high level signal is input to the control terminal 15j.
11 becomes conductive and is turned on. On the other hand, control terminal 1
When a low level signal is input to 5j, it turns off.

FIG. 5 shows the switch circuits 16a, 16b,
20 is a circuit diagram of an example of 20. FIG. This switch circuit 16a,
Reference numerals 16b and 20 denote known switching circuits composed of diodes, which include switching diodes D21 and 22; resistors R21 to R24 for supplying a direct current to these diodes D21 and 22; and a DC blocking capacitor C2.
1 to C24 and an inverter E21 for polarity reversal. The terminal 16h is an input terminal, the terminals 16i and 16j are output terminals, and 16k is a switching control terminal. The control signals S3 and S4 are input to the control terminal 16k.

In the switch circuits 16a, 16b and 20, when the high level signal is input to the control terminal 16k, the diode D21 becomes conductive, but the inverter E21 makes D22 non-conductive. Therefore, the output terminal 1
The 6j side is turned on and the 16j side is turned off. On the other hand, when a low level signal is input to the control terminal 16k, the output terminal 1
The 6i side is turned off and the 16j side is turned on.

FIG. 6 is a block diagram of the diversity controller. The reception signals received by the antennas 12 and 13 are input to the input side of the diversity controller 31. These input signals are compared in signal level by a known comparison circuit (not shown) in the controller 31, and a high level "1" or a low level "0" is obtained based on the comparison result.
Control signals S1 and S2 are output.

FIG. 7 is a block diagram of a TV / radio switching controller. A TV selection switch SW1, an FM radio selection switch SW2, and an AM radio selection switch SW3 are connected to the input side of the TV / radio switching controller 32. These switches SW1 to SW3 are provided on, for example, an instrument panel on the driver side.
Then, based on the switches SW1 to SW3 that are turned on (closed), the control signals S3 and S4 of the high level "1" or the low level "0" are output. Note that the resistors R31 to R33
Is the load resistance.

Next, the operation of the window glass antenna device 11 will be described. Table 1 is a comparison table of operation modes and control signals.

[0034]

[Table 1]

In this table, S1 or S2 is "1"
In the case of, the switch 15a or 15b is turned on (closed), and in the case of "0", it is turned off (open). S3
Is "1", the switches 16a and 16b are on the TV side,
When it is “0”, it indicates that the radio side has been selected. If S4 is "1", the switch 20 is AM.
On the other hand, when it is "0", it indicates that the mode is switched to the FM side.

First, the case where the TV selection switch SW1 is on will be described. This is when the control signal S3 is 1 (modes A to C). Mode A is a case where S1, S3 are 1, and S2 is 0. S4 may be 1 or 0. In this case, the antenna becomes a TV diversity antenna, and the reception signal of the antenna 12 is supplied to the TV 19.

Mode B is a case where S2 and S3 are 1 and S1 is 0. S4 may be 1 or 0. In this case also, the antenna becomes a TV diversity antenna, but the reception signal of the antenna 13 is supplied to the TV 19.

Mode C is a case where S1 to S3 are all 1. S4 may be 1 or 0. In this case also, the TV antenna is used, but the composite signal of the antenna 12 and the antenna 13 is supplied to the TV 19.

Next, the case where the FM selection switch SW2 is on will be described. This is 0 for both control signals S3 and S4.
Is the case (modes D to F). In mode D, S1 is 1,
This is the case where S2 to S4 are 0. In this case, it becomes a diversity antenna for FM, and the received signal of the antenna 12 is F
It is supplied to the M radio 21.

Mode E is a case where S2 is 1, and S1, S3 and S4 are 0. In this case also, although it becomes a diversity antenna for FM, the reception signal of the antenna 13 is supplied to the FM radio.

Mode F is a case where S1 and S2 are 1, and S3 and S4 are 0. In this case also, it becomes an FM antenna,
The combined signal of the antenna 12 and the antenna 13 is supplied to the FM radio.

Next, the case where the AM selection switch SW3 is on will be described. This is when the control signal S4 is 1 and S3 is 0 (mode G). Mode G is a case where S1, S4 are 1, and S3 is 0. S2 may be 1 or 0.
In this case, it serves as an AM antenna, and the reception signal of the antenna 12 is supplied to the AM radio 22.

Further, with respect to the AM antenna, an AM diversity antenna may be configured to supply the reception signal of the antenna 12 or the reception signal of the antenna 13 to the AM radio 22, or the combined signal of the antenna 12 and the antenna 13 may be used as the AM radio. It may be configured to supply to 22.

In this embodiment, the TV or FM / AM is used.
Although a radio antenna has been described, it can be applied to antennas for other purposes, such as car phone antennas.

[0045]

As described above, according to the invention of claim 1, the window glass antenna device according to the present invention has a structure in which the reception signals of the respective antennas can be output in combination in addition to being taken out individually. It is possible to obtain more kinds of received signals than the number of antennas.

According to the second aspect of the present invention, two diversity antennas for the television and the radio can be constructed with only two antennas. Further, since both systems are dedicated antennas for either the television or the radio when used, there is no inconvenience that the television antenna and the radio antenna interfere with each other.

That is, according to the present invention, since the number of diversity receiving antennas arranged on the window glass can be reduced, mutual interference between the antennas can be reduced and a highly sensitive antenna can be provided. it can. In addition, it is possible to secure a space for disposing another antenna for a car phone or the like. Further, since the input of the amplifier is switched, the amplifier can be shared.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a first embodiment of a window glass antenna device according to the present invention.

FIG. 2 is a schematic structural diagram of a second embodiment of a window glass antenna device according to the present invention.

FIG. 3 is an overall circuit diagram of the second embodiment.

FIG. 4 is a circuit diagram of a switch circuit according to the second embodiment.

FIG. 5 is a circuit diagram of a switch circuit according to the second embodiment.

FIG. 6 is a configuration diagram of a diversity controller according to the second embodiment.

FIG. 7 is a block diagram of a TV / radio switching controller according to the second embodiment.

FIG. 8 is a schematic structural diagram of a conventional window glass antenna device.

[Explanation of symbols]

 1, 11 Window glass antenna device according to the present invention 2, 14 Antenna-equipped window glass 3 Amplifier 4 Switch means 5 First TV receiving antenna 6 Second TV receiving antenna 12 Inverted T-shaped antenna 13 Anti-fog heater Antenna for combined use of wire 15 First switch means 16 Second switch means 19 Television (TV) 20 Changeover switch circuit 21 FM radio 22 AM radio

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Kakizawa 3-5-11 Doshomachi, Chuo-ku, Osaka-shi, Osaka Inside Nippon Sheet Glass Co., Ltd.

Claims (2)

[Claims] 1. A window glass comprising switch means for corresponding to each of a plurality of antennas arranged on a window glass of an automobile and switching whether or not a reception signal of each antenna is input to an amplifier. Antenna device. 2. An antenna of two systems arranged on a window glass, a first switch means for switching whether or not a reception signal of each antenna is input to a receiver side, and an input via the first switch means. A window glass antenna device, comprising: a second switch means for switching whether a received signal is input to an antenna input terminal on the television side or an antenna input terminal on the radio side.