JP3035217U - Diversity antenna device - Google Patents

Abstract

(57) Abstract: An insertion / removal of an antenna terminal with respect to an antenna connection connector can be detected using at least one signal line. SOLUTION: Each antenna connection connector 1a, 1b, 1
Switches 2a, 2b, 2c, 2d which are opened / closed according to the insertion / removal of the antenna 6 or the antenna terminal 7 with respect to c, 1d.
And each of these switches 2a, 2b, 2c, 2d
In accordance with the open or closed state of each of the switches 2a, 2b, 2c, 2d, each of the switches 2a, 2b, 2c,
A resistor network 3 that outputs a different voltage specific to each 2d is connected.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a diversity antenna device which is installed in, for example, an automobile, has a plurality of antennas (antenna elements), and switches and connects these antennas to a diversity main body according to a radio wave reception state.

[0002]

[Prior art]

 In the diversity antenna device in which the antenna and the diversity main body including the controller are not integrated, the antenna and the diversity main body are connected by using an antenna connection connector into which an antenna or an antenna terminal (plug or the like) is inserted and removed.

FIG. 3 is a circuit diagram of an essential part showing such a conventional diversity antenna apparatus. A is a diversity main body, and in addition to a diversity circuit not shown, an antenna and an antenna terminal to an antenna connector are also provided. A controller 5 including a microprocessor for detecting insertion / removal of the device is provided.

The diversity main body A is provided with a plurality of the antenna connecting connectors 1a, 1b, 1c, 1d, and some or all of the antenna connecting connectors 1a, 1b, 1c, 1d are The antenna 6 or the antenna terminal (plug) 7 connected to the antenna 6 is connectable so as to be freely inserted and removed.

Therefore, in the diversity main unit A, the antennas 6 connected to the respective antenna connecting connectors 1a, 1b, 1c, 1d are selected by switching and selecting with a switch according to the reception state of radio waves. A single antenna 6 is used to enable highly sensitive and stable reception.

In this case, in order to select the antenna 6 having the best reception state, it is necessary to compare the reception levels of the respective antennas 6, and at the time of this comparison, the antenna connection to which the antenna 6 is not connected is made. If any one of the connectors 1a, 1b, 1c and 1d is selected by the switch, switch noise is output, which is troublesome.

Therefore, conventionally, as shown in FIG. 3, switches 2a, 2b, 2c, 2d that open (or close) when the antenna terminal 7 is inserted near each antenna connector 1a, 1b, 1c, 1d. Are provided, and these are connected between the controller 5 and the ground through signal lines 4a, 4b, 4c, 4d, respectively, and further terminating resistors 10a, 10b, 10c, 10d are respectively connected to the signal lines 4a, 4b, 4c, 4d. By connecting to the DC power source via the antenna connection connector 1a, 1b, 1c, 1d to which the antenna terminal is not connected, the controller side can detect. As a result, the diversity main body A is not switched and connected to the antenna connecting connectors 1a, 1b, 1c and 1d to which the antenna terminal 7 is not connected to avoid the generation of the switch noise.

[0008]

[Problems to be solved by the device]

 However, in such a conventional diversity antenna device, in order to detect whether or not each antenna terminal 7 is inserted into the antenna connection connector 1a, 1b, 1c, 1d, the same number of signal lines 4a, 4b, 4c as the number of antennas 6 used. , 4d are required, which increases the number of input terminals for antenna detection of the controller 5 and also increases the number of wirings on the printed circuit board.

This invention solves the above-mentioned problems, and it is possible to detect the insertion / removal of the antenna terminal with respect to the antenna connection connector using at least one signal line, and the antenna detection input of the controller. It is an object of the present invention to obtain a diversity antenna device capable of reducing the number of terminals and the number of wirings on a printed circuit board.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the diversity antenna device according to the invention of claim 1 is provided with a switch that is opened / closed according to the insertion / removal of the antenna or the antenna terminal with respect to each antenna connection connector. According to the open or closed state of each switch, a resistor network that outputs a different voltage peculiar to each switch is connected.

In the diversity antenna device according to the invention of claim 2, the resistance network and the diversity main body are connected by one or a plurality of signal lines smaller than the number of antenna connection connectors.

In the diversity antenna device according to the invention of claim 3, a weighted resistor is provided in the resistor network, which is connected to a power source through a terminating resistor, and is serially connected to each of the switches. Is.

[0013]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1a, 1b, 1c and 1d are antenna connection connectors, and 2a, 2b, 2c and 2d are switches provided close to these antenna connection connectors 1a, 1b, 1c and 1d.

Reference numeral 5A denotes a controller which is provided in the diversity main body A and detects insertion / removal of the antenna 6 or the antenna terminal 7 with respect to the antenna connection connectors 1a, 1b, 1c, 1d. As will be described later, the controller 5A includes an analog / digital converter 8 that outputs a digital signal according to the level of the input analog signal (power generation).

Further, one end of each of the switches 2a, 2b, 2c and 2d is grounded, and the other end of each of the switches 2a, 3b, 3c and 3d whose weighted resistance values are R, 2R, 4R and 8R respectively. It is connected to one signal line 4 via. The other end of the signal line 4 is connected to the analog / digital converter 8.

The signal line 4 is connected to a direct current power source (+ V) at a connection point P via a terminating resistor 9 as shown in the figure. The resistors 3a, 3b, 3c, 3d and 9 form a resistor network 3, and when any of the resistors 3a, 3b, 3c and 3d is separated from the signal line 4, To output to the signal line 4 a voltage of a level according to the.

In the diversity antenna device having such a configuration, the antenna 6 or the antenna terminal 7 is inserted in all or a part of the antenna connection connectors 1a, 1b, 1c, 1d, and each of these antennas is received at the time of reception. The one with the best reception state is selected from the six, and the diversity circuit operates so as to guide the signal from the antenna 6 to the reception circuit.

In this case, if there is an antenna connector 1a, 1b, 1c, 1d in which the antenna 6 or the antenna terminal 7 is not inserted, one of the switches 2a, 2b, 2c, 2d corresponding to these is opened. And the resistors 3a, 3b, 3c, 3d connected thereto are separated from the resistor circuit including the signal line 4. That is, the combined resistance value of the resistors 3a, 3b, 3c, 3d connected in parallel changes to a specific value.

Therefore, the voltage at the connection point of the signal line 4 changes to a level corresponding to the changed combined resistance value. Therefore, this change in voltage level is input to the analog / digital conversion circuit 8 of the controller 5A, and here, a digital signal corresponding to the voltage level is output. That is, it can be determined by the digital signal which of the antenna connectors 1a, 1b, 1c and 1d the antenna 6 and the antenna terminal 7 are not connected to.

Therefore, if diversity reception is performed while selecting only the antenna connector 1a, 1b, 1c, 1d to which the antenna 6 or the antenna terminal 7 is connected by the switch according to the result of this determination, Switch noise output can be avoided with certainty.

To avoid such switch noise, in order to identify the antenna connector to which the antenna 6 and the antenna terminal 7 are not connected, one signal line 4 connecting the resistor network 3 and the controller 5A is used. Can be done with. As a result, there are advantages that the number of input terminals for detecting the antenna of the controller 5A can be reduced and the wiring on the printed circuit board can be simplified.

FIG. 2 shows another embodiment of the present invention. As the resistor network 3, an R-2R ladder resistor network consisting of resistors 3e, 3f, 3g, 3h, 3l having the same resistance value 2R and resistors 3i, 3j, 3k having the same resistance value R is used, and Connect the resistors 3e, 3f, 3g, 3h corresponding to the antenna connector 1a, 1b, 1c, 1d to the DC power source by switching the switches 2e, 2f, 2g, 2h when the antenna 6 or the antenna terminal 7 is inserted. However, it is designed to be grounded when detached.

Also according to this embodiment, whichever of the switches 2e, 2f, 2g, 2h on the side of the antenna connector 1a, 1b, 1c, 1d in which the antenna 6 or the antenna terminal 7 is not inserted is dealt with. The resistors 3e, 3f, 3g, and 3h are connected to a DC power source or grounded, and the voltage at the output terminal of the resistor network 3 changes accordingly, depending on the combination of insertion and removal of the antenna terminal 7. A specific voltage of different level can be input to the controller 5A through the signal line 4.

For this reason, the controller 5A generates a digital signal according to the level and specifies any one of the antenna connecting connectors 1a, 1b, 1c, 1d to which the antenna 6 is not connected, and as described above. In addition, the antenna can be switched without causing switch noise.

[0025]

[Effect of the invention]

 As described above, according to the first aspect of the present invention, the switch that is opened / closed according to the insertion / removal of the antenna or the antenna terminal to / from each antenna connector is provided, and each of these switches is in the open state or the closed state of the switch. According to the above, it is configured to connect a resistor network that outputs a different voltage peculiar to each of the above switches. Therefore, at least one signal line should be used to insert and remove the antenna terminal into and from the antenna connector. In addition to being able to detect, the number of antenna detection input terminals of the controller and the number of wires on the printed circuit board can be reduced.

Further, according to the invention of claim 2, since the resistance network and the diversity main body are configured to be connected by one or a plurality of signal lines less than the number of the antenna connection connectors, use of the antenna connection connector The number of input terminals for antenna detection of the controller can be significantly increased by inserting and removing more antennas and antenna connection connectors of the antenna terminals by using a signal line that is sufficiently smaller than the number. Instead, the effect of being able to be detected is obtained.

Further, according to the invention of claim 3, the resistance network is connected to the power source through the terminating resistance, and is connected in series to each of the switches to provide a weighted resistance. The effect that the signal data specifying the antenna connector in which the antenna or the antenna terminal is not inserted can be converted into the analog voltage value with the minimum resistance and output to the controller is obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a diversity antenna device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a diversity antenna device according to another embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional diversity antenna device.

[Explanation of symbols]

1a, 1b, 1c, 1d antenna connection connector 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h switch 3 resistor network 3a, 3b, 3c, 3d resistor 4 signal line 5 controller 6 antenna 7 antenna terminal A diversity body

Claims (3)

[Utility model registration claims] 1. A plurality of antennas or antenna terminals,
In the vehicle-mounted diversity antenna device connected to the diversity main body through a plurality of antenna connection connectors that are connectable / disconnectable, a switch that is opened / closed according to the insertion / removal of the antenna or the antenna terminal with respect to each antenna connection connector, A diversity antenna device, comprising: a resistor network connected to each of these switches to output a different voltage peculiar to each of the switches depending on whether the switch is open or closed. 2. The diversity antenna device according to claim 1, wherein the resistance network and the diversity main body are connected by one or a plurality of signal lines smaller in number than the antenna connection connectors. 3. The resistor network is provided with a weighted resistor that is connected to a power source via a terminating resistor and is serially connected to each of the switches. Diversity antenna device.