JP2000115006A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antenna device capable of corresponding to plural kinds of receiving equipment for receiving different frequency bands by selecting antennas to be combined from the plural ones based on a stored selecting state in accordance with a reception frequency and connecting them to receiving equipment. SOLUTION: The selection and connection states of plural antenna patterns 21A-21F are stored in a memory 24 in accordance with information of an input source (the types and receiving frequencies of receivers 11a-11d) so as to obtain an optimum antenna characteristic corresponding to transmission means, based on input source information, receiving signal level information and property judgement information of a receiving state obtained from a reception control part 13 with LAN. Together with it, the selection and connection states of optimum antenna patterns 21A-21F are stored in accordance with the types and reception frequencies of the receivers 11a-11d. Thus, the basic and minimum antenna patterns 21A-21F are selected and a prescribed connection is executed so that the optimum antennas are constituted in multiple numbers of receiving equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna apparatus that can support a receiving apparatus that receives different frequency bands.

[0002]

2. Description of the Related Art In recent years, many types of receivers such as televisions, FM / AM radios, navigations, and VICS have been mounted on vehicles. Since these receivers have different frequency bands, a plurality of antennas corresponding to the characteristics of each radio wave are required. Therefore, pole antennas having different shapes and sizes are provided so as to protrude outside the vehicle so as to obtain the best reception state corresponding to each radio wave source, or various film antennas are provided in the rear window.

[0003]

In order to receive radio waves having different frequency bands as described above, it is necessary to provide a plurality of antennas such as a pole antenna and a film antenna corresponding to each radio wave source. There is a possibility that the above problems may occur, or the vehicle may be damaged when entering a garage or washing a car. In addition, film antennas have a problem that many antennas cannot be installed because the antennas are installed on glass due to the installation area, and there is an influence between the antennas.

[0004] It is an object of the present invention to provide an antenna device that can support a plurality of receiving devices that receive different frequency bands.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of antennas for receiving radio waves, a receiving apparatus, and an antenna selection state and a connection state corresponding to a reception frequency of the receiving apparatus. Storage means for storing an active receiving apparatus and a selecting means for selecting an antenna to be combined from the plurality of antennas based on the selection state stored in the storing means according to the receiving frequency of the receiving apparatus; And a connection unit that combines and connects the antenna selected by the selection unit based on the connection state stored in the storage unit according to the reception frequency of the reception device and the reception device. It is characterized by the following.

[0006] Also, a receiving state detecting means for detecting a receiving state of the receiving apparatus, and a switching means for switching between a selection state and a connection state of the antenna when the receiving state detecting means detects deterioration of the receiving state. It is characterized by having.

A plurality of antennas for receiving radio waves,
Storage means for storing a selection state and a connection state of an antenna in association with a reception apparatus; and selecting an antenna to be combined from the plurality of antennas based on the selection state stored in the storage means according to the reception apparatus in operation. A connection unit that combines and connects an antenna selected by the selection unit based on a connection state stored in the storage unit according to a receiving device that is operating, and a connection unit that connects to a reception device; A receiving state detecting means for detecting a receiving state of the apparatus; and a switching means for switching between a selected state and a connected state of the antenna when the receiving state detecting means detects deterioration of the receiving state. Things.

The switching means includes a coarse adjustment means for switching between a selection state and a connection state of the antenna such that the antenna reception characteristics change greatly when the reception state is greatly deteriorated.
The present invention is characterized in that there is provided fine adjustment means for switching between a selection state and a connection state of the antenna so that the antenna reception characteristics change slightly when the deterioration of the reception state is small.

[0009] Further, there is provided an updating means for updating the contents stored in the storage means according to the selection state and the connection state of the antenna when the selection state and the connection state of the antenna are switched by the switching means.

[0010] Also, a sequential switching means for sequentially switching between an antenna selection state and a connection state, and a memory for storing, in the storage means, an antenna selection state and a connection state in which the reception state becomes the best during the operation of the sequential switching means. And an insertion means.

[0011] Further, the receiving device may be a presetting means for setting a frequency stored in a preset memory to a receiving frequency corresponding to the preset switch operated when the preset switch is operated, and a receiving means for sequentially switching the receiving frequency. Auto-preset means for storing an appropriate reception frequency in a preset memory, and the sequential switching means comprises:
The automatic preset means operates during operation.

[0012]

FIG. 1 is a block diagram showing the configuration of a vehicle-mounted antenna device according to one embodiment of the present invention. Hereinafter, description will be made with reference to the drawings.

A receiving unit 1 receives an antenna output signal from the antenna unit 2, a television receiver 11a for receiving VHF and UHF television waves, an FM (including FM multiplex broadcast), and an AM radio wave. Radio receiver 11
b, a GPS receiver 11c that receives a radio wave from an artificial satellite to detect the position of the vehicle, a VICS receiver that receives traffic information such as traffic congestion information, regulation information, and parking lot information transmitted by a radio beacon ( A traffic information receiver) 11d, a map database 12 including a CD-ROM (storage medium) 12a on which map information is recorded and a reading device (CD-ROM drive) 12b, a radio wave received by the GPS receiver 11c and a map database 12 to identify the position of the vehicle, travel route search / guidance processing, traffic information reception processing, broadcast wave reception processing, reception electric field strength signals from the television receiver 11a and the radio receiver 11b (for example, intermediate Frequency detection (rectification voltage), level detection processing for detecting the strength of the received radio wave (including processing for determining the quality of the reception state), antenna control unit 3 and LAN for exchanging data between the control units of the vehicle between the (Local Area Ne
2), a reception control unit 13 composed of a microcomputer that performs transmission processing of reception signal level information and reception state determination information, and television image, map information, and traffic information based on signals from the reception control unit 13. And an audio output unit 15 such as a speaker and an amplifier that outputs television audio and radio audio based on a signal from the reception control unit 13.

Reference numeral 2 denotes an antenna unit having optimum receiving characteristics for each of the receivers (11a to 11d) and outputting an antenna output signal to the receiving unit 1, and a plurality of dimensions and shapes installed on a rear window of the vehicle or the like. , That is, film-shaped antenna patterns 21A to 21F having different characteristics, and antenna patterns 21A to 21F for obtaining desired antenna characteristics.
, A switch circuit 22 including a PIN diode or the like for performing predetermined connection such as series, parallel or a combination thereof,
Input source (receiver type and reception frequency) information, reception signal level information,
Based on the reception state pass / fail judgment information, the selection and connection state of the plurality of antenna patterns 21A to 21F are stored in the memory 24 in association with the input source information so that optimum antenna characteristics corresponding to each transmission medium are obtained. An antenna control unit 23 configured by a microcomputer that controls the switch circuit 22 so as to select the optimum antenna patterns 21A to 21F and realize a connection state; the optimum antenna patterns 21 corresponding to the type of the receiver and the reception frequency.
It comprises a memory 24 for storing the selection and connection state of A to 21F (see FIGS. 3 and 4), and a preamplifier 25 for amplifying the output signal of the antenna connected by the switch circuit 22. The antenna pattern 21F is not shown, but a plurality of antenna patterns 21 for fine adjustment of the antenna characteristics are provided.
F1 to 21Fn (hereinafter, indicated as 21Fx in the description)
It consists of.

FIG. 2 is a flowchart of a reception process performed by the antenna control unit 23 of the vehicle-mounted antenna device according to one embodiment of the present invention. FIG. 3 is an example of antenna pattern connection of the vehicle-mounted antenna device according to one embodiment of the present invention. 4A and 4B are diagrams showing the stored contents in the antenna pattern connection of the on-vehicle antenna device according to one embodiment of the present invention, wherein FIG. 4A shows an FM radio receiver, FIG. 4B shows an AM radio receiver, and FIG. (D) is a television receiver. Hereinafter, description will be made with reference to the drawings. In this example, an antenna characteristic with a good reception state is obtained during normal reception processing.

In step S1, it is determined whether or not an input source has been selected. If an input source has been selected, the process proceeds to step S2. If no input source has been selected, the process ends. That is,
Depending on the viewer, an input source (hereinafter, the input source is the receiver 11a to
11d is determined based on whether or not it has been acquired through the LAN connecting the receiving unit 1 and the antenna unit 2. In step S2, the selected input source is confirmed, and the process proceeds to step S3. In other words, LAN
Receivers 11a to 11 obtained from reception control unit 13 through
Check the type of 1d and the reception frequency.

In step S3, the antenna pattern connection stored for each input source (receiver type and reception frequency) is loaded, and the flow advances to step S4. That is, the antenna pattern connection stored in the memory 24 is read out corresponding to the type of the receiver and the reception frequency obtained via the LAN. Antenna pattern connection refers to a plurality of antenna patterns 2 having different dimensions and shapes (resulting in different characteristics).
An antenna having good reception characteristics is constituted by serially connecting 1A to 21F and by combining them in series (X1, X2, etc. of the basic connection in FIG. 3). For example, as shown in FIG. 3 and FIG.
83.0 MHz), the antenna patterns 21A to 21F are selected from the antenna patterns 21A to 21F.
21B and 21C are selected, and the antenna patterns 21A and 2C are selected.
1B are connected in parallel and the antenna pattern 21C is connected in series to form an antenna (basic antenna pattern connection X1). When the reception state is degraded (reception signal level is reduced) during FM radio reception, the antenna pattern 21F
x (one of 21F1 to 21Fn) is connected in series for fine adjustment to form an antenna (fine adjustment antenna pattern connection X1x, X2x). The selection and connection of the antenna pattern are realized by the antenna control unit 23 selectively turning on and off a switch circuit composed of PIN diodes provided corresponding to each of the antenna patterns 21A to 21F. In addition, antenna patterns 21A, 21B, and 21D are selected from antenna patterns 21A to 21F for a reception frequency in a high frequency range (83.1 to 90.0 MHz) of FM radio, and antenna patterns 21A and 21B are connected in parallel. The antenna is configured by connecting the antenna patterns 21D in series (basic antenna pattern connection X2). Similarly, for the other receivers, the antenna pattern 21A to 21F is selected from the antenna patterns 21A to 21F for the AM radio (low frequency region).
A, 21B, and 21C are selected, and the antenna pattern 21A is selected.
And 21C are connected in parallel, and the antenna pattern 21B is connected in series to form an antenna (basic antenna pattern connection Y
1) Yes. When the reception condition deteriorates during AM radio reception, the antenna patterns 21Fx (21F1 to 21F1) are further added.
21Fn) is connected in series for fine adjustment to form an antenna (fine adjustment antenna pattern connection Y1).
x) For navigation, the antenna pattern 21A is selected from the antenna patterns 21A to 21F.
B and 21E, and select antenna patterns 21B and 21E.
Are connected in series to form an antenna (basic antenna pattern connection Z1). When the reception condition is deteriorated during reception of the navigation radio wave, the antenna pattern 21F is further added.
x is connected in series for fine adjustment to form an antenna (fine adjustment antenna pattern connection Z1x). Hereinafter, the same applies to the basic antenna pattern connection W for the television receiver.
1, W2 and W3.

In step S4, an antenna pattern control signal is output to the switch circuit 22, and the flow advances to step S5. That is, the antenna pattern connection (X1, X2, etc. of the basic connection in the case of FM radio) stored in the memory 24 corresponding to the type of the receiver and the reception frequency is read and output to the switch circuit 22. The switch circuit 22 switches P connected to each of the antenna patterns 21A to 21F according to the instruction.
The IN diodes are individually turned on and off, a plurality of antenna patterns 21A to 21F are selected and combined to form an antenna having predetermined characteristics, and the antenna output is amplified by a preamplifier and the selected receiver ( 11a-11
d).

In step S5, received signal information (electric field strength and the like) is obtained, and the flow advances to step S6. That is, even with the optimal antenna pattern connection (for example, X1) stored in the memory 24, the reception state slightly changes depending on the traveling area and traveling state of the vehicle. Therefore, in order to perform correction (fine adjustment), the reception control unit 13 constantly detects the reception state of the currently receiving receiver, and transmits the result to the LAN.
To get through. In step S6, it is determined whether or not the received signal has been degraded.
Then, if the received signal does not deteriorate, the process is terminated. That is, the determination is made based on the received signal information obtained from the reception control unit 13 via the LAN. Note that L from the reception control unit 13
The received signal information obtained by the antenna control unit 23 via the AN may be a received signal level (electric field strength or the like),
The result of the comparison between the received signal level and the reference signal level may be a result of determining whether the reception state is good or deteriorated. That is, the content of the received signal information is determined by which of the reception control unit 13 and the antenna control unit 23 determines whether the received signal is degraded.

In step S7, the antenna pattern connection is changed in accordance with a predetermined rule, and in step S8
Move on to That is, the antenna control unit 23 determines the basic antenna pattern (the basic antenna pattern connection corresponds to the antenna pattern connections X1 and X2 in FIG. 3 in the FM radio).
Does not change, and the connection of the antenna pattern for correction is slightly changed sequentially. For example, a plurality of antenna patterns 21F (21F1-2F) that can obtain only a slight change in characteristics are obtained.
1Fn) to sequentially change the connection (the antenna pattern connection X1x, X2 in FIG.
When the antenna pattern 21F1 is selected for the one corresponding to x or the like, the antenna pattern connections are X11 and X21.) The result is output to the receiver 1 as an antenna output.

In step S8, it is determined whether or not the received signal has been recovered. If the received signal has recovered, the process is terminated. If not, the process returns to step S7. In other words, the connection of the antenna pattern is changed, the reception signal level is detected by the reception control unit 13, and the judgment result as to whether the reception signal level is equal to or more than the predetermined value is again transmitted to the LAN.
Get by. When the received signal returns, the process ends.
If the received signal does not recover, the same processing is repeated until the received signal recovers by further changing the antenna pattern connection (selecting the antenna pattern 21F2 to configure the antenna pattern connections X12 and X22). If the received signal is restored by changing the antenna pattern connection, the antenna pattern connection previously stored in the memory 24 is replaced (for example, the antenna pattern 21).
If the selection of F2 is good, the antenna pattern connection is changed from X1 to X12 and stored.) If the reception state is not recovered even after fine adjustment, the basic antenna pattern connection (from X1 to X2, etc.) will be changed, but the basic antenna pattern connection is set for each receiver (including the reception frequency). As a result, the reception state can be recovered by fine adjustment unless the reception frequency changes significantly.

If the reception frequency is changed during viewing, the processing from step S1 is repeated.

As described above, in the present embodiment, the optimum antenna is constructed by reading out the antenna pattern connection registered in advance together with the reception frequency for each receiver, so that the appearance of the vehicle is not impaired. It is not necessary to install an antenna, and an antenna optimum for many receiving devices can be configured by selecting a basic minimum antenna pattern and performing a predetermined connection.

FIG. 5 is a flowchart of an auto-preset process of the vehicle-mounted antenna device according to one embodiment of the present invention.
(A) is a process of the reception control unit 13, and (b) is a process of the antenna control unit 23. 6A and 6B are diagrams showing the contents stored in the auto-preset processing of the vehicle-mounted antenna device according to one embodiment of the present invention. FIG.
(B) shows the contents stored in the memory 24. In the following, description will be made with reference to the drawings by taking an example of an FM broadcast auto preset process. In the normal auto-preset processing, the reception frequency is sequentially swept, and the reception frequency in the good reception state is stored in correspondence with the preset button number. In this example, the reception frequency in the good reception state corresponds to the preset button number. And the reception control unit 13
The optimum antenna pattern connection at the reception frequency is stored in the memory 24 of the antenna unit 2 in the memory inside the antenna. This process starts when the auto preset button is operated on the receiving unit 1 side. Further, in this example, it is assumed that the measurement of the reception signal level and the determination of the reception state based on the reception signal level are performed by the reception control unit 13 and the reception signal level and the determination result are transmitted to the antenna control unit 23 side via the LAN. explain.

First, the processing on the reception control unit 13 side will be described. In step S11, an initial reception frequency is set, and the routine goes to step S12. That is, in the auto-preset of the FM receiver, the reception frequency is sequentially set every 0.1 MHz from 76.0 MHz, and thus the initial value is 76.0.
MHz is set. In step S12, the receiver / received frequency information is transmitted to the antenna control unit 23, and the process proceeds to step S13. That is, the type of the receiver and the reception frequency when the auto-preset is instructed on the receiving unit 1 side are transmitted to the antenna control unit 23 via the LAN. For example, the information of 76.0 MHz of the FM receiver is transmitted to the antenna control unit 23.
Send to In the auto-preset of the FM receiver, the reception frequency is sequentially swept from 76.0 MHz to 90.0 MHz every 0.1 MHz.
When returning to 12, the reception frequency is 76.1 MHz.
The changed information will be transmitted.

In step S13, the received signal level is measured, and at the same time, the presence or absence of the received signal is determined.
Move on to That is, the antenna control unit 23 reads the corresponding antenna pattern connection from the memory 24 based on the type of the receiver and the reception frequency received via the LAN, and instructs the switch circuit 22 to connect (the reception frequency 76 of the FM radio). At 1 MHz, antenna pattern connection X1). As a result, the antenna output is sent to the FM receiver 11b.
The reception control unit 13 measures the set reception frequency and the reception signal level in the antenna pattern connection. And
The presence or absence of a received signal is determined based on the measurement result. If the received signal level is equal to or higher than the reference signal level, it is determined that a signal is present. Since an antenna pattern connection (basic) set in advance for each receiver is given, there is a broadcast wave, but the antenna characteristics are not bad and the received signal level is not extremely low. Is determined by the presence or absence of the broadcast wave. In step S14, the determination result is transmitted to the antenna control unit 23, and the process proceeds to step S15.
That is, the reception control unit 13 transmits the determination result (the presence or absence of the broadcast wave) to the antenna control unit 23 via the LAN. In step S15, if the result of determination in step S13 is based on the presence or absence of a received signal, if there is a received signal, the process proceeds to step S16. If there is no received signal, the process proceeds to step S22 without performing the processing of step S16 and thereafter, and the receiving frequency is set to 0. .1MH
Then, the process returns to step S12 to perform the same processing.

In step S16, the received signal level is measured, and the flow advances to step S17. That is, the reception control unit 13
Measure the reception frequency and the reception signal level at the antenna pattern connection set in. In step S17, the measurement result is transmitted to the antenna control unit 23, and the process proceeds to step S18. That is, the reception signal level measured via the LAN is transmitted to the antenna control unit 23. Note that the reception control unit 13 also stores the maximum reception signal level corresponding to the reception frequency. The purpose is step S21
In this case, when the reception frequencies are stored in correspondence with the preset button numbers, the reception frequencies are sequentially stored in descending order of the reception state (high reception signal level). Step S1
In step 8, it is determined whether an antenna pattern search end indicating that the antenna pattern search has been completed has been received. If it is determined that the antenna pattern search has been completed, the process proceeds to step S19, where it is determined that the antenna pattern search has been completed. If not, the process returns to step S16 to measure the received signal level by the next antenna pattern connection. This antenna pattern search end signal is transmitted from the antenna control unit 23 to the reception control unit 13 via the LAN. If there is a received signal for one set reception frequency, the antenna pattern connection is sequentially changed (searched), so that the processing of steps S16 to S18 is repeated until the change of all antenna pattern connections is completed. .

In step S19, it is determined whether or not the processing has been completed for all reception frequencies. If the processing has been completed for all reception frequencies, the process proceeds to step S20. If the processing has not been completed, the process proceeds to step S22. The reception frequency is increased by 0.1 MHz, and the same processing (reception signal level measurement) is performed for the next reception frequency. Completion of processing for all reception frequencies indicates that the set frequency is 90.0M.
Hz.

In step S20, the fact that the processing has been completed for all reception frequencies is transmitted to antenna control section 23, and the flow advances to step S21. That is, the reception frequency is set to 76.0.
The fact that the measurement of the reception signal level has been completed for all reception frequencies from 9 MHz to 90.0 MHz every 0.1 MHz is transmitted to the antenna control unit 23 via the LAN. In step S21, a reception frequency having a high reception signal level is stored as shown in FIG. 6A corresponding to the preset button number. For example, when there are six preset buttons, six buttons are stored in ascending order of received signal level, and the rest are not preset.

In step S22, the reception frequency is increased, and the flow returns to step S12. That is, for the next reception frequency, the reception frequency is increased by 0.1 MHz in order to measure the reception signal level and determine whether the reception state is good or bad.

Next, processing on the antenna control unit 23 side will be described. In step S31, receiver / reception frequency information is obtained, and the routine goes to step S32. That is, the receiving unit 1
The type of the receiver and the reception frequency at the time when the auto-preset instruction is issued on the side are acquired via the LAN. For example, the information of 76.0 MHz of the FM receiver is acquired. In the auto preset in the FM receiver, the reception frequency is set to 76.
Since the sweep is performed sequentially from 0 MHz to 90.0 MHz every 0.1 MHz, the next time the process returns to step S31, the reception frequency has been changed to 76.1 MHz.

In step S32, a default pattern is set for each receiver and reception frequency, and the flow advances to step S33. That is, a predetermined antenna pattern connection (F) stored in the memory 24 in advance corresponding to the type of the receiver and the reception frequency obtained from the reception control unit 13 via the LAN.
At a reception frequency of 76.1 MHz of the M radio, the switch circuit 22 is instructed to be the antenna pattern connection X1) in FIG. The antenna output by this antenna pattern connection is output to the FM receiver 11b.

In step S33, the judgment result is received, and the routine goes to step S34. That is, the reception signal level is measured by the reception control unit 13, and the result of the presence / absence determination of the reception signal is obtained via the LAN. In step S34, it is determined whether or not there is a received signal. If there is a received signal, the process proceeds to step S35. If there is no received signal, the process returns to step S31 to obtain the next received frequency from the reception control unit 13. I do.

In step S35, an antenna pattern search is started, and the flow advances to step S36. That is, the antenna pattern connections read from the memory 24 are sequentially changed at the reception frequency (for example, the antenna pattern connections from X1 to X11, X12,.
21, X22 ...). Note that the antenna output is output to the FM receiver side by this antenna pattern connection. In step S36, the measurement result is obtained, stored in the memory, and then proceeds to step S37. That is, the result of measuring the reception signal level by the reception control unit 13 is acquired via the LAN, and the result is stored in the memory 24 for each antenna pattern connection. In step S37, it is determined whether or not the antenna pattern search is completed. If the antenna pattern search is completed, the process proceeds to step S38. If the antenna pattern search is not completed, the process returns to step S35 to continue the antenna pattern search (next step). Change to antenna pattern connection). In step S38, the end of the antenna pattern search is transmitted to the reception control unit 13 via the LAN. In other words, all antenna pattern connections (X
1 to X2n), the end of the antenna pattern search is transmitted to the reception control unit 13 via the LAN in order to have the next reception frequency changed.

In step S39, the optimum antenna pattern connection is confirmed, and the flow advances to step S40. That is, an antenna pattern search is performed, and the best reception condition (the highest reception signal level) stored for each antenna pattern connection is selected. In step S40, it is determined whether or not the end of the reception frequency sweep has been received. If the frequency sweep has been completed, the process proceeds to step S41. If the frequency sweep has not been completed, the process returns to step S31 to return to the next LA.
The same processing is repeated for the reception frequency acquired by N. In step S41, the confirmed optimum antenna pattern connection is set as the basic antenna pattern connection in the memory 2
4 and the processing is completed. That is, the optimum antenna pattern connection corresponding to the type of the receiver and the reception frequency is stored in the memory 24 as shown in FIG.

The reception frequency in a good reception state obtained in this manner is stored in the reception control unit 13 as shown in FIG. 6 (a) corresponding to the preset button in the same manner as the normal preset processing, and The best antenna pattern connection obtained is stored in the memory 24 in a table as shown in FIG. It should be noted that the number of storages on the memory 24 side is stored regardless of the number of preset buttons, for all reception frequencies for which it is determined in step S34 that there is a reception signal.

With the above processing, the auto preset processing is completed. When the viewer selects the type of the receiver and the preset button (button number), the reception control unit 13 sets a reception frequency corresponding to the preset button number,
The type of the receiver and the reception frequency are sent to the antenna control unit 23 via the LAN, and the best antenna pattern connection corresponding to the set reception frequency is obtained from the table (FIG. 6B) stored in the memory 24. The switch circuit 22 is read out and instructed to make the antenna pattern connection. For example, when the preset button 2 is selected, the reception frequency is set to 82.8 MHz in the reception control unit 13, the information is transmitted to the antenna control unit 23 via the LAN, and stored in the memory 24. The antenna pattern connection X13 corresponding to 8 MHz is read and output to the switch circuit 22. In this way, the reception frequency and the optimal antenna pattern connection are performed in conjunction with the operation of the preset button.

As described above, in this embodiment, the optimum antenna pattern connection can be performed simultaneously with the auto-preset process together with the reception frequency for each vehicle and each receiver.

[0039]

As described above, according to the present invention, it is possible to provide an antenna device that can support a plurality of receiving devices that receive different frequency bands.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a vehicle-mounted antenna device according to an embodiment of the present invention.

FIG. 2 is a flowchart of a receiving process of the vehicle-mounted antenna device according to one embodiment of the present invention.

FIG. 3 is an example of antenna pattern connection of the vehicle-mounted antenna device according to one embodiment of the present invention.

FIG. 4 is a diagram showing stored contents in antenna pattern connection of the vehicle-mounted antenna device according to one embodiment of the present invention.

FIG. 5 is a flowchart of an auto-preset process of the vehicle-mounted antenna device according to one embodiment of the present invention.

FIG. 6 is a diagram showing stored contents in an auto-preset process of the vehicle-mounted antenna device according to one embodiment of the present invention.

[Explanation of symbols]

11a: television receiver, 14: display unit, 11b: radio receiver, 15 ...
..Sound output section, 11c ... GPS receiver,
2 ····· Antenna part, 11 d ··· Beacon receiver, 21 ··· Antenna, 12 ··· Map database, 22 ··· Switch circuit, 12
a: CD-ROM, 23: antenna control unit, 12b: CD-ROM drive unit, 24
..... memory, 13 ..... reception control unit,
25 ··· Preamplifier.

Claims (7)

[Claims] 1. A plurality of antennas for receiving a radio wave, storage means for storing a selection state and a connection state of an antenna in association with a reception apparatus and a reception frequency of the reception apparatus, an active reception apparatus and the reception apparatus Depending on the receiving frequency of the device,
Selecting means for selecting an antenna to be combined from the plurality of antennas based on the selection state stored in the storage means; and a receiving device in operation and a receiving frequency of the receiving device,
An antenna device comprising: a connection unit that combines and connects the antennas selected by the selection unit based on the connection state stored in the storage unit and connects to a reception device. 2. A receiving state detecting means for detecting a receiving state of the receiving device, and a switching means for switching between a selection state and a connection state of the antenna when the receiving state detecting means detects deterioration of the receiving state. The antenna device according to claim 1, wherein the antenna device is provided. 3. A plurality of antennas for receiving radio waves, storage means for storing a selected state and a connection state of the antenna in association with the receiving apparatus, and stored in the storage means according to the operating receiving apparatus. Selecting means for selecting an antenna to be combined from the plurality of antennas based on the selected state; and combining the antenna selected by the selecting means based on the connection state stored in the storage means according to an operating receiver. Connecting means for connecting and connecting to a receiving apparatus; receiving state detecting means for detecting a receiving state of the receiving apparatus; and connecting the antenna to a selected state when the receiving state detecting means detects deterioration of the receiving state. An antenna device comprising: switching means for switching a state. 4. The switching means comprises: a coarse adjustment means for switching between a selected state and a connection state of an antenna such that the antenna reception characteristic is greatly changed when the reception state is greatly deteriorated; 4. The antenna device according to claim 2, further comprising: fine adjustment means for switching between a selection state and a connection state of the antenna so that the characteristics change slightly. 5. An updating means for updating the storage contents of said storage means according to the selection state and connection state of the antenna when the switching state switches between the selection state and the connection state of the antenna. Item 5. The antenna device according to item 4. 6. A sequential switching means for sequentially switching an antenna selection state and a connection state, and a memory for storing the antenna selection state and the connection state in which the reception state is best in the storage means during the operation of the sequential switching means. The antenna device according to claim 1, further comprising a plug-in unit. 7. The receiving device according to claim 1, wherein said receiving means is a presetting means for setting a frequency stored in a preset memory as a receiving frequency corresponding to the preset switch operated when the preset switch is operated, and receiving means for sequentially switching the receiving frequency. 7. The antenna device according to claim 6, further comprising: an auto-preset unit that stores a predetermined reception frequency in a preset memory, wherein the sequential switching unit operates while the auto-preset unit is operating.