JP2009049608A - Antenna device and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device to be used for a MIMO type radio communication device, to independently adjust the polarizing condition and the direction of the directional range. <P>SOLUTION: The antenna device X to be used for the MIMO type radio communication device Y comprises a plurality of antenna elements 11-14 having flat-shape directional ranges (A1-A4 in Fig.1) and having different polarizing directions (R1-R4 in Fig.1) set in the longitudinal directions of different directional ranges, and a power feed switch 15 for selectively feeding power from the radio communication device Y to one or more of the plurality of antenna elements 11-14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antenna device used in a MIMO (Multiple Input / Multiple Output) wireless communication device that performs wireless communication using a plurality of antenna devices, and a control method thereof.

In general, wireless communication apparatuses that perform wireless communication using a method that conforms to the IEEE 802.11a standard, the IEEE 802.11g standard, or the like have become widespread. For example, the wireless communication device corresponds to a mobile phone, a PDA, a wireless LAN system, or the like.
In recent years, with the increase in the amount of data handled by wireless communication, research and development for realizing higher communication speeds are being promoted. Of particular interest is MIMO (Multiple Input / Multiple Output) communication in which wireless communication is performed in parallel through a plurality of propagation channels (signal transmission lines) using a plurality of antennas.
MIMO communication performs communication simultaneously on each of a plurality of propagation channels as in the IEEE 802.11n standard, for example. Thus, high-speed communication can be performed by multiplexing the propagation channels. Specifically, if communication of up to 54 Mbps is multiplexed on two independent propagation channels using two antennas, high-speed communication of up to about 108 Mbps can be realized. Further, if multiplexing is performed with three propagation channels using three antennas, high-speed communication of about 162 Mbps at the maximum can be realized. That is, theoretically, the communication speed can be increased linearly corresponding to the number of antennas.
However, in reality, the correlation characteristics of each propagation channel caused by the antenna characteristics and the radio wave propagation environment greatly affect the communication speed realized by the MIMO communication. Therefore, a method of reducing the correlation between the two antennas by making the two antennas orthogonal is known (see, for example, Patent Document 1).
Patent Document 2 discloses a wireless communication device that controls the polarization state of radio waves of each antenna by feeding power to a plurality of antenna feeding terminals with a predetermined phase difference. In this configuration, the correlation between the antennas can be reduced by controlling the characteristics of each antenna.
JP 2005-184564 A JP 2006-33306 A

However, there are cases where the correlation between the antennas cannot be sufficiently reduced only by controlling the polarization state of the antenna as in Patent Document 2. Therefore, it is conceivable to further reduce the correlation between the antennas by using an antenna having a flat directivity range and making a difference in the characteristics of the propagation channel depending on the longitudinal direction of the directivity range. However, in a normal antenna, the polarization state and the direction of the pointing range are in a fixed relationship.
For example, as shown in FIG. 6A, consider an antenna 101 having vertical polarization (arrow R101) and a flat shape (A101) in which a directing range has a vertical direction as a longitudinal direction. When this antenna 101 is rotated by 90 °, as shown in FIG. 6 (b), the propagation channel characteristic is a horizontally polarized wave (arrow R102), and the directional range is a flat shape with the horizontal direction as the longitudinal direction (A102). It becomes. That is, in the antenna 101, both the polarization state and the direction of the directivity range change similarly. Therefore, there is a problem that the polarization state and the direction of the directivity range cannot be adjusted independently.
Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is an antenna device used in a MIMO wireless communication device, in which the polarization state and the direction of the directivity range are independently determined. An object of the present invention is to provide an antenna device that can be adjusted and a control method thereof.

In order to achieve the above object, the present invention is an antenna device used in a MIMO wireless communication device that performs wireless communication using a plurality of antenna devices, the directivity range is a flat shape, and the different directivity ranges are used. A plurality of antenna elements in which different polarization directions are set with respect to the longitudinal direction, and a power supply destination switching for selectively switching the power supply destination from a predetermined power supply means to one or more of the plurality of antenna elements. And a means.
Specifically, the plurality of antenna elements may include the following antenna elements (1) to (4).
(1) A first antenna element in which a directivity range is a flat shape having a predetermined direction as a longitudinal direction, and a polarization direction is the predetermined direction.
(2) A second antenna element in which a directivity range is a flat shape having a direction perpendicular to the predetermined direction as a longitudinal direction, and a polarization direction is the predetermined direction.
(3) A third antenna element in which a directivity range is a flat shape having the predetermined direction as a longitudinal direction, and a polarization direction is a direction perpendicular to the predetermined direction.
(4) A fourth antenna element in which the directivity range is a flat shape whose longitudinal direction is a direction perpendicular to the predetermined direction, and the polarization direction is a direction perpendicular to the predetermined direction.
In the antenna device according to the present invention configured as described above, any one or more of the plurality of antenna elements are selectively switched and used by the power feeding destination switching unit, so that the polarization state and the direction of the directivity range can be changed. Can be adjusted independently. Accordingly, it is possible to further reduce the correlation between the antenna devices in the MIMO wireless communication, compared with the case where only the polarization state is adjusted.
Further, simultaneous power feeding control means for simultaneously feeding power to two antenna elements having the same longitudinal direction of the directivity range among the plurality of antenna elements with respect to the power feeding destination switching means and power feeding control means simultaneously. It is desirable to include a feeding relation adjusting means for adjusting the phase relation and distribution ratio of feeding to the two antenna elements. As a result, in the antenna device, it is possible to finely adjust the direction of circular polarization and the direction of linear polarization.

By the way, the present invention may be understood as a method for controlling an antenna device used in a wireless communication device that performs wireless communication using the MIMO scheme. At this time, the antenna device includes a plurality of antenna elements having a flat directivity range and different polarization directions with respect to the longitudinal directions of the different directivity ranges. Note that the plurality of antenna elements may include the first to fourth antenna elements described in (1) to (4) above.
The antenna device control method according to the present invention is characterized in that the power supply destination from the predetermined power supply means is selectively switched to one or a plurality of the plurality of antenna elements.
According to such an antenna device control method, the polarization state and the direction of the directivity range can be adjusted independently. Accordingly, it is possible to further reduce the correlation between the antenna devices in the MIMO wireless communication, compared with the case where only the polarization state is adjusted.
In addition, by simultaneously feeding two antenna elements having the same longitudinal direction of the directivity range among the plurality of antenna elements and adjusting the phase relationship and distribution ratio of the feeding to the two antenna elements, circular polarization It is possible to finely adjust the turning direction and the polarization direction of linearly polarized waves.

According to the present invention, by selectively switching and using any one or more of the plurality of antenna elements, the polarization state and the direction of the directivity range can be adjusted independently. Accordingly, it is possible to further reduce the correlation between the antenna devices in the MIMO wireless communication, compared with the case where only the polarization state is adjusted.
In addition, by simultaneously feeding two antenna elements having the same longitudinal direction of the directivity range among the plurality of antenna elements and adjusting the phase relationship and distribution ratio of the feeding to the two antenna elements, circular polarization It is possible to finely adjust the turning direction and the polarization direction of linearly polarized waves.

Hereinafter, embodiments and examples of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. It should be noted that the following embodiments and examples are examples embodying the present invention, and do not limit the technical scope of the present invention.
FIG. 1 is a block diagram showing a schematic configuration of a MIMO system Z using the antenna device X according to the embodiment of the present invention, FIG. 2 is a block diagram showing a specific example of the antenna device X, and FIG. FIG. 4 is a block diagram showing a schematic configuration of an antenna device X ′ which is a modification of the device X, and FIG. 4 is a diagram for explaining a polarization state adjustment method in the antenna device X ′.
First, a schematic configuration of a MIMO system Z using the antenna device X according to the embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the MIMO system Z includes a wireless communication device Y and a plurality of antenna devices X (X1, X2,...) Connected to the wireless communication device Y. The antenna devices X1, X2,... Are configured similarly. In the following, a case where two antenna devices X1 and X2 are used will be described as an example, but the use of more antenna devices X is also conceivable as another embodiment. Although not shown, an information processing device such as a personal computer is connected to the wireless communication device Y directly or via a communication device such as a HUB.
On the other hand, there is also a MIMO system having the same configuration as the MIMO system Z, that is, two antenna devices, on the other station side with which the MIMO system Z communicates. As a result, two propagation channels are formed between the MIMO system Z and the counterpart station. The MIMO system Z performs radio communication with the MIMO system on the partner station side by the MIMO method using the antenna devices X1 and X2 in which the two propagation channels are formed.

Next, each of the wireless communication device Y and the antenna device X constituting the MIMO system Z will be described in detail.
The wireless communication device Y is connected in parallel to each of the antenna devices X through a plurality of signal transmission lines L (L1, L2,...). The wireless communication device Y transmits and receives wireless signals in parallel using the plurality of antenna devices X via the plurality of signal transmission lines L. Thereby, for example, when the signal transmission speed in one signal transmission line L is 54 Mbps at the maximum, communication at the maximum of 108 Mbps can be performed by the two signal transmission lines L.
Specifically, the wireless communication device Y includes a MIMO modem (not shown) that conforms to the IEEE 802.11n standard. The MIMO modem performs modulation of transmission signals, demodulation of reception signals, and the like, and since a conventional one may be used, detailed description thereof is omitted here.

On the other hand, each of the antenna devices X is schematically configured to include a plurality of antenna elements 11 to 14 and a power feeding destination switch 15 (an example of a power feeding destination switching means).
The antenna elements 11 to 14 are antenna elements having a flat shape in which a range in which a radio wave is radiated or received (hereinafter referred to as “directional range”) has one direction as a longitudinal direction. The directivity range is preferably a flat shape in which the axial ratio of the 3 dB angle range (the range in which the 3 dB gain is lower than the maximum gain value) in each of the antenna elements 11 to 14 is twice or more.
As schematically shown in FIG. 1, each of the antenna elements 11 to 14 has a different polarization direction set with respect to the longitudinal direction of a different directivity range. That is, each of the antenna elements 11 to 14 is different in at least either the longitudinal direction of the directivity range or the polarization direction.

Specifically, the antenna element 11 (corresponding to the first antenna element) has a flat shape in which the directivity range A1 has a horizontal direction (an example of a predetermined direction) as a longitudinal direction, and the polarization direction R1 is a vertical direction ( Vertical polarization). Further, the antenna element 12 (corresponding to the second antenna element) has a flat shape in which the directivity range A2 has a horizontal direction as a longitudinal direction, similarly to the antenna element 11, but the polarization direction R2 has a horizontal direction (horizontal). Polarization).
On the other hand, the antenna element 13 (corresponding to the third antenna element) has a flat shape in which the directivity range A3 has a vertical direction as a longitudinal direction, and the polarization direction R3 is a vertical direction (vertical polarization). The antenna 14 (corresponding to the fourth antenna element) has a flat shape in which the directivity range A4 has a vertical direction as a longitudinal direction, like the antenna element 13, but the polarization direction R4 has a horizontal direction (horizontal deviation). Wave).

The power supply destination switch 15 selectively switches the power supply destination from the wireless communication apparatus Y (predetermined power supply means) to any one of the antenna elements 11 to 14. In each of the antenna devices X, any one of the antenna elements 11 to 14 is selected by the power supply destination switch 15 according to an instruction from the wireless communication device Y. As a result, the radio signal transmitted from the radio communication device Y is transmitted from the antenna element established by the power supply destination switch 15, and the radio signal received by the antenna element is input to the radio communication device Y. Is done.
Specifically, the wireless communication device Y causes the antenna device X1 and the antenna device X2 to select antenna elements having different polarization directions in order to prevent a plurality of channels of communication signals from interfering with each other. For example, the wireless communication device Y causes the antenna device X1 to select the horizontally polarized antenna element 11 or 12, and the antenna device X2 to select the vertically polarized antenna element 13 or 14.
However, depending on the radio wave propagation environment in which the MIMO system Z is placed, the correlation between the antenna devices X1 and X2 may not be sufficiently reduced only by changing the polarization direction as described above. On the other hand, when the radio wave propagation environment is asymmetric in the vertical and horizontal directions, a difference can be provided in the propagation characteristics of the antenna devices X1 and X2 by providing a difference in the direction of the directivity ranges of the antenna devices X1 and X2.

In each of the antenna devices X according to the embodiment of the present invention, any one of the antenna elements 11 to 14 in which different polarization directions are set with respect to the longitudinal direction of different directivity ranges is selectively used. be able to. That is, in each of the antenna devices X, the direction of the directivity range and the polarization direction can be easily adjusted independently.
Therefore, in the MIMO system Z, by adjusting the direction of the directivity range and the polarization direction of each antenna device X according to the radio wave propagation environment in which the MIMO system Z is placed, The correlation between them can be reduced as much as possible. Thereby, it is possible to sufficiently secure the communication speed or communication capacity of the wireless communication executed in the MIMO system Z. Especially in places where there are many obstacles, such as indoors, there are many environments where the distribution of reflectors in the vertical direction differs greatly from the distribution of reflectors in the horizontal direction. Therefore, a great effect can be obtained by changing the direction of the directivity range as described above.
For example, while monitoring the speed of communication performed through the wireless communication device Y, the power supply destination from the wireless communication device Y is selectively switched to any one of the antenna elements 11 to 14, and the communication is performed. The direction of the directivity range and the polarization direction of each antenna device X may be set while trial and error so that the speed is as high as possible. At the same time, the signal level input from each of the antenna devices X to the wireless communication device Y may be measured and used for determination.
Of course, the wireless communication device Y may automatically set the direction of the directivity range and the polarization direction of each antenna device X according to the signal level input from each antenna device X. Good.

Here, a specific example of the antenna device X will be described with reference to FIG.
As shown in FIG. 2, each of the antenna elements 11 to 14 includes two patch array antennas 21 and 22. The patch array antennas 21 and 22 change the polarization direction depending on the position of the energization point. For example, in the antenna elements 11 and 13, since the lower end portions of the patch array antennas 21 and 22 are the energization points, the polarization directions R1 and R3 are vertical. In the antenna elements 12 and 14, since the right end portions of the patch array antennas 21 and 22 are energized points, the polarization directions R2 and R4 are horizontal.
On the other hand, the direction of the entire directivity range of the patch array antennas 21 and 22 differs depending on the arrangement direction. For example, in the antenna elements 11 and 12, since the patch array antennas 21 and 22 are arranged in the vertical direction, the orientation of the directivity ranges A1 and A2 in the longitudinal direction is the horizontal direction. On the other hand, in the antenna elements 13 and 14, since the patch array antennas 21 and 22 are arranged in the horizontal direction, the longitudinal directions of the directivity ranges A3 and A4 are vertical.
Thus, by changing the position of the energization point of the patch array antennas 21 and 22 and the arrangement of the patch array antennas 21 and 22, the antenna elements 11 to 14 can be moved in the longitudinal directions of the different directivity ranges. However, the polarization direction can be different.

Meanwhile, in each of the antenna devices X, the antenna elements 11 to 14 are individual antenna elements. However, the antenna element 11 and the antenna element 14, and the antenna element 12 and the antenna element 13 are common antennas. An element can be substituted.
Specifically, it is conceivable that the antenna device X is provided with the antenna elements 11 and 12 and a rotation instruction unit (not shown) that rotatably supports the antenna elements 11 and 12. When the antenna elements 11 and 12 are rotated by the rotation support portion, the direction of the directivity range and the polarization direction are changed in each of the antenna elements 11 and 12.
Therefore, the antenna element 11 is used as the antenna element 14 by rotating the antenna element 11 by the rotation support portion, and the antenna element 12 is rotated by rotating the antenna element 12. 13 can be used.

By the way, in the antenna device X, the direction of linear polarization can be changed in two ways (vertical direction and horizontal direction) depending on which of the antenna elements 11 to 14 is selected.
Here, a configuration in which the polarization state can be adjusted more finely will be described. FIG. 3 is a block diagram showing a schematic configuration of the antenna device X ′ according to the third embodiment, FIG. 4 is a diagram for explaining a polarization state adjustment method by the antenna device X ′, and FIG. It is a schematic diagram for demonstrating an example of the adjustment method of the polarization state by the said antenna apparatus X '. In addition, the same code | symbol is attached | subjected to the structure similar to the said antenna apparatus X, and the description is abbreviate | omitted.
As shown in FIG. 3, the antenna device X ′ has a power supply destination switch 25 (an example of power supply destination switching means) instead of the power supply destination switch 15. The power feeding destination switch 25 switches the power feeding destination from the wireless communication apparatus Y to one or more of the antenna elements 11 to 14. The power feeding destination switch 25 includes switches 25a to 25d for individually turning on / off the connection of the wireless communication device Y and the antenna elements 11 to 14.
In the antenna device X ′, a phase adjuster 26 (in each of the signal transmission path from the feeding destination switch 25 to the antenna element 11 and the signal transmission path from the feeding destination switch 25 to the antenna element 13 is provided. An example of a power supply relation adjusting unit) is provided. Further, in the antenna device X ′, the distribution ratio adjuster 27 is connected to each of the signal transmission path from the wireless communication apparatus Y to the switches 25a and 25b and the signal transmission path from the wireless communication apparatus Y to the switches 25c and 25d. (An example of a power feeding relationship adjusting unit) is provided.
The phase adjuster 26 can arbitrarily adjust the phase of the wireless signal supplied from the power supply destination switch 25. The phase adjuster 26 adjusts the phase of the wireless signal supplied from the power supply destination switch 25 in accordance with an instruction from the wireless communication device Y.
The distribution ratio adjuster 27 can arbitrarily adjust the distribution ratio (distribution ratio) of the wireless signal fed from the wireless communication device Y. The distribution rate adjuster 27 adjusts the distribution rate of the wireless signal supplied from the wireless communication device Y according to an instruction from the wireless communication device Y.

Hereinafter, a method for adjusting the polarization state in the antenna device X ′ will be described with reference to FIG. In addition, the process in the said adjustment method is performed by the said radio | wireless communication apparatus Y or an installation operator at the time of installation adjustment. Here, a case where the polarization direction is adjusted using the antenna element 11 and the antenna element 12 having the same directivity range will be described as an example. However, the antenna element 13 and the antenna element 14 may be used. It is the same.
4A shows a case where the wireless communication apparatus Y gives an instruction to the power supply destination switch 25 so that only the switch 25a corresponding to the antenna element 11 is turned on. ing. At this time, in the power supply destination switch 25, only the switch 25a is turned on, and the radio signal from the radio communication device Y is transmitted only to the antenna element 11. Therefore, the radio wave radiated from the antenna device X ′ is linearly polarized (vertically polarized) similar to the polarization direction R1 of the antenna element 11.
Similarly, FIG. 4B shows a case where the wireless communication apparatus Y instructs the power supply destination switch 25 to turn on only the switch 25b corresponding to the antenna element 12. ing. At this time, in the power supply destination switch 25, only the switch 25b is turned on, and the radio signal from the radio communication device Y is transmitted only to the antenna element 12. Therefore, the radio wave radiated from the antenna device X ′ is linearly polarized (horizontal polarization) similar to the polarization direction R2 of the antenna element 12.

On the other hand, FIGS. 4C to 4F show that the wireless communication device Y is connected to the power supply destination switch 25 so that the switches 25a and 25b corresponding to the antenna elements 11 and 12 are simultaneously turned ON. The case where the instruction is issued is shown. At this time, in the power supply destination switch 25, the switches 25a and 25b are simultaneously turned ON, and the radio signal from the radio communication device Y is simultaneously transmitted to the antenna elements 11 and 12. Here, the wireless communication device Y when executing such processing is an example of the simultaneous power supply control means. Such a process corresponds to a simultaneous power feeding process.
The antenna device X may be provided with a control circuit, and the control circuit may perform the above processing. For example, the control circuit causes the power supply destination switch 25 to turn on the switches 25a and 25b simultaneously based on an instruction from the wireless communication device Y. In this case, the control circuit is an example of the simultaneous power supply control means.

At this time, as shown in FIGS. 4C to 4F, the wireless communication apparatus Y adjusts the phase relationship and the distribution ratio of the wireless signals fed to the antenna elements 11 and 12 to thereby The polarization state in the antenna device X ′ is adjusted. Specifically, the phase relationship and the distribution ratio of the radio signals fed to the antenna elements 11 and 12 are adjusted by controlling the phase adjuster 26 and the distribution ratio adjuster 27 by the wireless communication apparatus Y. Is done. Here, the adjustment process corresponds to a power supply relation adjustment process, and the phase adjuster 26 and the distribution ratio adjuster 27 that perform the adjustment correspond to a power supply relation adjustment unit.
First, as shown in FIG. 4C, when the phase shift of the wireless signal fed from the wireless communication device Y to the antenna elements 11 and 12 is zero, the signal is radiated from the antenna device X ′. The radio wave becomes a linearly polarized wave in the 45 ° direction in which the polarization directions R1 and R2 of the antenna elements 11 and 12 are combined.
Similarly, as shown in FIG. 4E, when the phase shift of the radio signal fed from the radio communication device Y to the antenna elements 11 and 12 is 180 °, the antenna device X ′ The radiated radio wave becomes a 45-degree linearly polarized wave in which the polarization directions R1 and R2 of the antenna elements 11 and 12 are combined. However, the linearly polarized wave direction at this time is shifted by 90 ° from the case of FIG.

Furthermore, since the antenna device X ′ is provided with the distribution ratio adjuster 27 as described above, the linear polarization direction of the radio wave radiated from the antenna device X ′ can be set more finely. Is possible. Here, this point will be described with reference to FIG. As shown in FIG. 5A, the angle of the polarization direction of the radio wave radiated from the antenna device X ′ with respect to the horizontal direction is θ. Here, it is assumed that the state of FIG. 4C, that is, the switches 25a and 25b are ON and the phase shift by the phase adjuster 26 is zero.
In this case, in the antenna apparatus X ′, the distribution ratio of the radio signal fed from the wireless communication apparatus Y to the antennas 11 and 12 is continuously changed by the distribution ratio adjuster 27, so that FIG. As shown in b), the angle θ of the linearly polarized wave radiated from the antenna device X ′ can be continuously changed. For example, when the ratio of the feeding amount of the antenna 11 and the feeding amount of the antenna 12 is gradually changed from 1: 0 to 0.5: 0.5, 0: 1, the angle θ of the linearly polarized wave is 90 °. It gradually changes from (FIG. 4 (a)) to 45 ° (FIG. 4 (c)) and 0 ° (FIG. 4 (b)).
As described above, in the antenna device X ′, the direction of the linearly polarized wave can be finely adjusted, so that the polarization state can be set optimally. In particular, by combining with the phase adjustment by the phase adjuster 26, it is possible to freely adjust the direction of linear polarization within a range of 360 °.

Further, as shown in FIG. 4D, when the phase shift of the wireless signal fed from the wireless communication device Y to the antenna elements 11 and 12 is 90 °, the radiation from the antenna device X ′ is radiated. The radio wave is circularly polarized with the turning direction to the left.
Similarly, as shown in FIG. 4 (f), when the phase shift of the wireless signal fed from the wireless communication device Y to the antenna elements 11 and 12 is 270 °, the antenna device X ′ The emitted radio wave is circularly polarized with the turning direction to the right. That is, the direction of the circularly polarized wave at this time is opposite to that in the case of FIG.
As described above, when the antenna device X ′ is used, power is supplied to two antenna elements having the same directivity range among the antenna elements 11 to 14 and the phases of power supply to the two antenna elements are simultaneously supplied. By adjusting the relationship and the feed rate, the polarization direction in the antenna device X ′ can be adjusted more finely.

The block diagram which shows schematic structure of the MIMO system Z using the antenna apparatus X which concerns on embodiment of this invention. The block diagram which shows the specific example of the antenna apparatus X which concerns on embodiment of this invention. The block diagram which shows schematic structure of antenna apparatus X 'which is a modification of the antenna apparatus X which concerns on embodiment of this invention. The figure for demonstrating the adjustment method of the polarization state of antenna apparatus X 'which is a modification of the antenna apparatus X which concerns on embodiment of this invention. The schematic diagram for demonstrating an example of the adjustment method of the polarization state of antenna apparatus X 'which is a modification of the antenna apparatus X which concerns on embodiment of this invention. The figure for demonstrating the directivity range and polarization state in the antenna apparatus used with the conventional radio | wireless communication apparatus.

Explanation of symbols

11-14 ... Antenna elements 15, 25 ... Feed destination switch (an example of a feed destination switching means)
25a to 25d ... switch 26 ... phase adjuster (an example of a power feeding relationship adjusting means)
27: Distribution ratio adjuster (an example of a power supply-related adjusting means)
A1 to A4 ... Directional ranges R1 to R4 ... Polarization direction X (X1, X2, ...) ... Antenna device X '(X1', X2 ', ...) according to the embodiment of the invention ... Example 3 of the invention Antenna device Y ... wireless communication device Z ... MIMO system

Claims (6)

An antenna device used in a MIMO wireless communication device that performs wireless communication using a plurality of antenna devices,
A plurality of antenna elements having a flat directivity range and different polarization directions with respect to the longitudinal direction of the different directivity ranges;
Power supply destination switching means for selectively switching a power supply destination from a predetermined power supply means to one or more of the plurality of antenna elements;
An antenna device comprising: The plurality of antenna elements are
A first antenna element whose directional range is a flat shape having a predetermined direction as a longitudinal direction and whose polarization direction is the predetermined direction;
A second antenna element having a flat shape in which a directional range is a longitudinal direction perpendicular to the predetermined direction, and a polarization direction is the predetermined direction;
A third antenna element in which a directivity range is a flat shape having the predetermined direction as a longitudinal direction, and a polarization direction is a direction perpendicular to the predetermined direction;
A fourth antenna element having a flat shape in which a directivity range is a direction perpendicular to the predetermined direction as a longitudinal direction, and a polarization direction is a direction perpendicular to the predetermined direction;
The antenna device according to claim 1, comprising: Simultaneous feed control means for feeding power simultaneously to two antenna elements having the same longitudinal direction of the directivity range among the plurality of antenna elements with respect to the feed destination switching means;
A feeding relation adjusting means for adjusting a phase relation and / or a distribution ratio of feeding to the two antenna elements fed simultaneously by the simultaneous feeding control means;
The antenna device according to claim 1, further comprising: A method of controlling an antenna device used in a MIMO wireless communication device that performs wireless communication using a plurality of antenna devices,
The antenna device includes a plurality of antenna elements having a flat directivity range and different polarization directions with respect to the longitudinal directions of the different directivity ranges,
A method for controlling an antenna device, wherein a power supply destination from a predetermined power supply means is selectively switched to one or more of the plurality of antenna elements. The plurality of antenna elements are
A first antenna element whose directional range is a flat shape having a predetermined direction as a longitudinal direction and whose polarization direction is the predetermined direction;
A second antenna element having a flat shape in which a directional range is a longitudinal direction perpendicular to the predetermined direction, and a polarization direction is the predetermined direction;
A third antenna element in which a directivity range is a flat shape having the predetermined direction as a longitudinal direction, and a polarization direction is a direction perpendicular to the predetermined direction;
A fourth antenna element having a flat shape in which a directivity range is a direction perpendicular to the predetermined direction as a longitudinal direction, and a polarization direction is a direction perpendicular to the predetermined direction;
The method for controlling an antenna device according to claim 4, comprising: A simultaneous feeding step of feeding simultaneously two antenna elements having the same longitudinal direction of the directivity range among the plurality of antenna elements;
A feeding relationship adjustment step of adjusting a phase relationship and / or a distribution ratio of feeding to the two antenna elements fed by the simultaneous feeding step;
The method for controlling an antenna device according to claim 4, wherein:

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