JP2009049982A - Multiple input/output communication device, antenna device used in the same, and communications system using the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a MIMO system wherein multiple communication is attained with identical frequency that utilizes the difference in multiple antenna space arrangements, but has limit in the extension of the distance reached. <P>SOLUTION: Use of 2 or more radiowaves whose polarized wave faces differ obtains communication of multiple-input multiple-output orthogonal frequency division multiple (MIMO-OFDM) by using orthogonal antennas as multiple antennas. The orthogonal antenna can employ a patch-type, Yagi type, or the like types. As polarized wave faces of the multiple radiowaves differ, extension of the distance will not seemingly make the difference of the space arrangement small caused by the extension of the distance. For this reason, the distance for multiplexed communication can be extended, or the communication speed can be maintained sufficiently high. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multiplex input / output communication device, an antenna device used therefor, and a communication system using the same.

  In recent years, wireless LANs are widely used in various places such as private houses, offices, and public facilities. When a wireless LAN is used in a building or the like, various obstacles often exist between a terminal and an access point, and a good communication state cannot always be maintained. In many cases, a plurality of terminals are connected to one access point.

  In such a case, in the conventional single-input single-output (SISO) or single-input multiple-output (SIMO) communication system, the effective speed of the wireless LAN is greatly reduced. In general, if communication is performed using a wide frequency band, the communication speed can be increased. However, in a wireless LAN, a usable band is allocated, and the band cannot be easily widened. Therefore, a new communication method has been proposed in which a plurality of antennas are prepared and different data are transmitted and received over the same frequency. One of them is a communication method called a space division multiplexing method, which is generally called a multiple input / output (MIMO) communication method. The configuration of such a communication device is shown in Patent Document 1 below.

JP-A-2005-45351

  In such a multiplex input / output communication apparatus, a plurality of antennas are used. However, because of the principle of space division multiplex communication, the relationship between the antenna on the transmission side and the antenna on the reception side needs to be different between the antennas. For this reason, there has been a problem that a predetermined separation distance must be ensured between the plurality of antennas on the transmitting side or the receiving side, and the apparatus tends to be large. This problem cannot be overlooked because the difference in the spatial state of the antenna between transmission and reception becomes smaller as the communication distance is increased. As a result, if an attempt is made to increase the communication distance, the distance between the antennas on the receiving side and the transmitting side must be increased, and the communication apparatus becomes large.

  Instead of increasing the size of the antenna device, a technology has been proposed to improve the communication distance and speed by dynamically controlling the reach and directivity of radio waves using beamforming technology. However, there is a problem that software for controlling the reach and directivity of radio waves becomes complicated, and this is not a realistic solution.

  Based on such background art, the problem to be solved by the present invention is to reduce the size of the antenna device without degrading the communication performance in the multiplex input / output communication device, and thus to reduce the size of the multiplex input / output communication device itself. There is a place to plan.

  A multiple input / output communication device, an antenna device, and a communication system according to the present invention that solve at least a part of the problems will be described below.

[First embodiment]
The multiple input / output communication apparatus according to the first form is
A multiplex input / output communication device capable of communicating multiplexed data with other communication devices,
An antenna device capable of communication using a plurality of polarized waves;
A transmission circuit that divides data to be transmitted and multiplexes and transmits the data by a plurality of polarizations of the antenna device;
The gist of the present invention is to provide a receiving circuit that receives the data by separating a signal multiplexed on the other communication device side from a signal received by the antenna device using a plurality of polarized waves.

  In such a multiplex input / output communication device, as a result of using a plurality of polarized waves for communication between the transmission side and the reception side, multiplex input / output communication with a miniaturized antenna device can be easily realized.

  Here, the antenna device may be an orthogonal antenna. Here, the orthogonal antenna is an antenna having a configuration in which polarization planes of radio waves having a plurality of different polarization planes radiated from the antenna do not interfere with each other. As a result, the antenna device can be further reduced in size, and multiple input / output communication can be easily realized using a plurality of polarized waves. As an orthogonal antenna, a rectangular plate-shaped ground plate, a rectangular or circular plate-shaped radiating element provided on the ground plate at a predetermined distance, and feeding to different positions on the phase of the radiating element A patch-type orthogonal antenna provided with a power supply terminal can also be used. The patch-type orthogonal antenna can be easily downsized. In addition, since the antenna is planar, it is not necessary to increase the distance between the antennas, and there is an advantage that it can be easily incorporated into a device such as a wireless LAN terminal or an access point.

  Alternatively, the orthogonal antenna includes a first Yagi / Uda antenna having reflectors, radiators, and directors arranged in order from the rear end side, and a reflector, radiator, and conductor arranged in order from the rear end side. A second Yagi / Uda antenna having a waver, wherein the first Yagi / Uda antenna has the same directivity direction and rotated by a predetermined angle around the directivity direction, and the first and second Yagi / Uda antennas; It can be set as the Yagi-type orthogonal antenna provided with the feed line which each feeds to the radiator of the antenna. The Yagi-Uda antenna can achieve extremely high directivity, and is suitable for performing multiple input / output communication with a distance between the transmitter and the receiver.

  Further, in this multiplex input / output communication device, the receiving circuit may be provided with a circuit that multiplies the received signal by a predetermined receiving weight and separates a plurality of data from the received signal. In such a configuration, the transmission side need not have information on the transmission path. On the other hand, the transmission side and the reception side may perform eigenmode transmission in which information related to the transmission path is shared and transmitted and received. In this case, since information regarding the transmission path is shared, high communication characteristics can be realized.

  In the multiplex input / output communication apparatus, for example, the transmission circuit includes a circuit that processes data to be multiplexed in advance and encodes the data in a space-time domain, and the reception circuit includes a code in the transmission circuit. The signal may be separated from the received signal by using a decoding method corresponding to the conversion method. By performing such encoding in the spatio-temporal region, communication reliability can be improved.

  Such a coding method can be either a space-time block code (STBC) or a space-time trellis code (STTC). According to such encoding, a high gain can be realized.

[Second form]
The antenna device which is the second form is
An antenna device used for at least one of a wireless LAN terminal and an access point that performs wireless communication by a multiple input / output method,
A plate-shaped ground plate;
A rectangular or circular plate-like radiation element provided at a predetermined distance on the first good conductor;
The gist of the invention is that it is a patch type antenna device provided with a power supply terminal for supplying power to different positions on the phase of the radiation element.
By using such an antenna device, multiple input / output communication used for a wireless LAN between the terminal and the access point can be performed, and the antenna device can be downsized.

[Third embodiment]
The antenna device which is the third form is
An antenna device used for at least one of a wireless LAN terminal and an access point that performs wireless communication by a multiple input / output method,
A first Yagi-Uda antenna having a reflector, a radiator, and a director arranged in order from the rear end side;
A second Yagi having a reflector, a radiator, and a director arranged in order from the rear end side and having the same directivity direction of the first Yagi / Uda antenna and rotated by a predetermined angle about the directivity direction・ Uda antenna and
The gist of the present invention is that it is a Yagi type orthogonal antenna device provided with feed lines that feed power to the radiators of the first and second Yagi / Uda antennas, respectively.
By using such an antenna device, it is possible to perform multiplex input / output communication used for a wireless LAN between the terminal and the access point, and since the antenna device has high directivity, the communication distance between the terminal and the access point is increased. be able to.

[Fourth form]
A communication system according to a fourth aspect is a communication system that performs wireless communication with a transmitter and a receiver by a multiple input / output method,
The transmitter is
A first antenna device that performs transmission using a plurality of polarized waves;
A transmission circuit that divides data to be transmitted and multiplexes and transmits the data by using a plurality of polarizations of the first antenna device;
The receiver
A second antenna device that performs reception using a plurality of polarized waves;
And a receiving circuit that receives the data by separating a signal multiplexed on the transmitter side from a signal received by the second antenna device using a plurality of polarized waves. .
In such a wireless system, as a result of using a plurality of polarized waves for communication between the transmitter and the receiver, it is possible to easily realize multiplex input / output communication with a miniaturized antenna device.

[First embodiment]
Examples of the present invention will be described below. FIG. 1 is an explanatory diagram showing a wireless LAN system 30 including an access point 10 and a terminal 20 as an embodiment of the present invention. The access point 10 is connected to a WAN 40 such as the Internet by wire, and performs wireless communication with the terminal 20. The access point 10 outputs a request from the computer 50 connected to the terminal 20 to the WAN 40 side, or outputs data returned from the WAN 40 side to the requested terminal 20 side via the wireless LAN. As an example of the protocol used for the exchange between the WAN 40 and the access point 10 and the terminal 20, a so-called TCP / IP protocol is used in this embodiment, but various protocols can be applied.

  The access point 10 includes an interface (I / F) 12 with the WAN 40, a demultiplexer 15 that separates data received from the WAN 40 via the interface 12, and two pieces of separated data in the housing 11. Are provided with two transmission circuits 17 and 18, respectively. The output sides of the transmission circuits 17 and 18 are connected to the antenna device 100 attached to the housing 11, and data to be transmitted is transmitted to the terminal 20 via the antenna device 100 by wireless communication. . The configuration of the antenna device 100 will be described later.

  On the other hand, an independent antenna device 200 is connected to the terminal 20, and two receiving circuits 21 and 22 for inputting two signals received by the antenna device 200 and receiving circuits 21 and 22 respectively receive the signals. A multiplexer 25 that synthesizes the output data and an interface (I / F) 27 that exchanges data output by the multiplexer 25 with the computer 50 are provided.

  In the above description, in order to simplify the description, the access point 10 only outputs the data from the WAN 40 side via the antenna device 100, and the terminal 20 receives the data received from the access point 10 via the wireless LAN. Is only output to the computer 50 side. Of course, in practice, the access point 10 also receives data from the terminal 20, and the terminal 20 also transmits data to the access point 10. Therefore, each of the access point 10 and the terminal 20 is also provided with a reception side circuit and a transmission side circuit described as being incorporated in the other device.

  FIG. 8 is an explanatory diagram showing an example of a schematic configuration of the access point 10a capable of transmitting and receiving according to the present embodiment. Here, components having the same functions as those of the access point 10 shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. Note that a terminal capable of transmitting and receiving also has a schematic configuration similar to that of the access point 10a.

  As shown in FIG. 8, the access point 10a includes an interface (I / F) 12a, a demultiplexer 15, transmission circuits 17 and 18, a multiplexer 25, reception circuits 21 and 22, and a switching unit. 14.

  The antenna device 100 can transmit the two systems of signals output from the two transmission circuits 17 and 18 as radio signals, and receives the two systems of signals as radio signals, and sends them to the two reception circuits 21 and 22. Output is possible.

  The switching unit 14 includes a first switching unit 14a and a second switching unit 14b. The first switching unit 14 a connects one system of the antenna device 100 and the transmission circuit 17 or the reception circuit 21. The second switching unit 14 b connects the other system of the antenna device 100 and the transmission circuit 18 or the reception circuit 22. The first switching unit 14a and the second switching unit 14b are controlled so as to be synchronized, and select the transmission circuits 17 and 18 at the time of transmission and select the reception circuits 21 and 22 at the time of reception. That is, the switching unit 14 is configured to be able to select either one of the connection between the antenna device 100 and the transmission circuits 17 and 18 and the connection between the antenna device 100 and the reception circuits 21 and 22.

  The interface 12a is interposed between the demultiplexer 15 and the multiplexer 25 and the WAN 40, and outputs data from the WAN 40 to the demultiplexer 15 and outputs data from the multiplexer 25 to the WAN 40. To do.

  FIG. 2 is an explanatory diagram showing an overview of the access point 10. As shown in the figure, the access point 10 includes a connector 13 for attaching a connection cable to the WAN 40, a plastic cover 19 for covering the attached antenna device 100, and the like. For convenience of understanding, in FIG. 2, the cover 19 is drawn with a part thereof broken. In the present embodiment, the antenna device 100 is covered by the cover 19, but can be attached to the access point 10 in an exposed state.

  Connection to the WAN 40 may be made directly if the access point 10 has the function, but is usually connected via a modem or the like (not shown). The modem is connected to an optical cable connected to the Internet network, a coaxial cable used for transmission / reception of cable television, an ADSL metal cable, or the like, and modulates / demodulates signals between each cable side and the access point 10 side.

  On the other hand, the external appearance of the terminal 20 and its antenna device 200 is shown in FIG. As illustrated, in the terminal 20, the antenna device 200 is an external type, and the antenna device 200 is housed in an independent housing 201. The terminal 20 is inserted into an IC card slot of the computer 50. Of course, it is possible to connect to a USB port or an IEEE1394 connector. Alternatively, the function of the terminal 20 may be built in the computer 50 in advance. In this case, the antenna device 200 may be incorporated in the computer 50 in advance, or only the antenna device 200 may be externally attached.

  On the access point 10 side, the antenna device 100 is covered with a cover 19 and attached to the housing 11 of the access point 10. On the terminal 20 side, the antenna device 200 is housed in a unique housing 201. This terminal 20 is connected to the antenna device 200 by a dedicated cable 205. The terminal 20 is provided with a USB connector 210, and the terminal 20 is directly connected to the computer 50 using the USB connector 210. When the terminal 20 is connected to the USB connector of the computer 50, the terminal 20 functions as a slave when viewed from the computer 50.

  Both antenna devices 100 and 200 have the same configuration, although the storage forms are different. Therefore, the configuration of the antenna device 100 on the access point 10 side will be described below as an example. The appearance of the antenna device 100 is shown in FIG. Although there is a difference between internal and external, the antenna device 200 basically has the same form. This antenna device 100 (200) is an orthogonal antenna in which two metal plates 111 and 112 are separated by a predetermined distance d, and is a so-called patch type antenna. Here, the orthogonal antenna is an antenna having a configuration in which polarization planes of radio waves having a plurality of different polarization planes radiated from the antenna do not interfere with each other. Therefore, when communication is performed using a plurality of polarized waves, the antenna device 100 (200) can be configured with an integrated antenna by using an orthogonal antenna, and the device can be downsized. . If the frequency of the radio wave used for the wireless LAN is 2.4 GHz, the wide plate 111 of the two metal plates 111 and 112 of the antenna device 100 (200) is about 70 mm × 70 mm and narrow. The plate 112 is approximately 50 mm × 50 mm in size. The distance d between them is about 10 mm. The metal plate 111 operates as a ground plate, and the metal plate 112 functions as a radiating element. Both plates 111 and 112 are fixed by insulating columns 121 and 122. In the antenna device 100, the fixing is performed by attaching the antenna device 100 to the side surface of the housing 11 with an insulating support. In the antenna device 200, the fixing is performed by attaching to the inner side surface of the housing 201 with an insulating support.

  The plate 112 of the antenna device 100 (200) is connected to power supply / reception lines 131 and 132 for supplying power to the plate (receiving power at the time of reception). The power supply / reception line 131 is for connecting the output from the transmission circuit 17 (reception circuit 21) to the plate 112 of the antenna device 100 (200), and the power supply / reception line 132 is the transmission circuit 18 (reception circuit 22). Is connected to the plate 112 of the antenna device 100 (200). The connection location of the power receiving and feeding lines 131 and 132 with the plate 112 is shifted by exactly 90 degrees in the plane of the plate 112 when viewed from the center of the antenna device 100 (200). For this reason, the radio wave radiated from the plate 112 of the antenna device 100 (200) has a plane of polarization rotated by exactly 90 degrees.

  The radio waves radiated from the plate 112 of the antenna device 100 have the same frequency band at 2.4 GHz, but the plane of polarization is shifted. Therefore, the signals output from the two transmission circuits 17 and 18 are radiated from the antenna device 100 by two polarized waves. A radio wave whose polarization plane is shifted can be easily distinguished even if the distance to the other antenna device 200 is long. Since the other antenna device 200 also has a configuration composed of the same plates 111 and 112, an electric signal is induced in each of the plates that receive two polarized waves radiated from the antenna device 100 and function as radiation elements. The An electric signal from the plate functioning as a radiating element is output to the two receiving circuits 21 and 22 of the terminal 20.

  The access point 10 and the terminal 20 constituting the wireless LAN system 30 have a function of transmitting and receiving multiplexed signals by a so-called MIMO method. Various methods are known for transmitting and receiving multiplexed signals. In this embodiment, in detail, a multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) is adopted. Of course, it is also possible to employ a multi-input multi-output space division multiplexing system (MIMO-SDM) and other systems. As another method, the reception circuits 21 and 22 may be provided with a circuit configuration that multiplies the reception signal by a predetermined reception weight and separates a plurality of data from the received signal. The transmission circuits 17 and 18 and the reception circuits 21 and 22 can also perform eigenmode transmission in which information related to the transmission path is shared and transmitted and received. Alternatively, the transmission circuits 17 and 18 include a circuit that processes data to be multiplexed in advance and encodes the data in the space-time domain, and the reception circuits 21 and 22 include the codes in the transmission circuits 17 and 18. It is also possible to perform separation from the received signal using a decoding method corresponding to the conversion method. Such a coding method may be either a space-time block code (STBC) or a space-time trellis code (STTC).

  Further, in this embodiment, in the antenna device 100 (200), the connection portions of the power receiving and feeding lines 131 and 132 are shifted by 90 degrees and the planes of polarization are orthogonalized. There may be three places connected to the plate 112, which are shifted by 60 degrees with respect to the center of the plate 112 to use three polarized waves. When N (N ≧ 2) polarized waves are used, separation between the polarized waves is facilitated by shifting the connection position of the power supply / reception line by 180 degrees / N.

  In the wireless LAN system 30 having the configuration described above, the access point 10 and the terminal 20 transmit and receive multiplexed signals by the MIMO scheme. At this time, wireless communication is performed using the positional difference of the antennas. Instead of securing different paths above, different paths in wireless communication are secured by utilizing the difference in the polarization plane of the radio wave radiated from the antenna device. For this reason, even if the distance between the access point 10 and the terminal 20 is separated, the difference in the route on the wireless communication cannot be maintained due to the distance difference. As a result, there is an advantage that the communication distance can be extended or the communication speed can be kept sufficiently high. In addition, since the patch type orthogonal antenna is employed, it is not necessary to say that the antenna itself jumps out of the housing 11 in order to secure the distance between the antennas. For this reason, the antenna device 100 can be stored in the housing 11 of the access point 10. Needless to say, it may be placed separately from the housing 11 of the access point 10 like the antenna device 200 on the terminal 20 side.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The antenna device 300 of the second embodiment is used in the same wireless LAN system as that of the first embodiment, and is used in place of the antenna devices 100 and 200 of the first embodiment. The configuration of the wireless LAN system itself is the same as that of the first embodiment. FIG. 5 is a perspective view showing the external appearance of the antenna device 300. This antenna device 300 is a kind of orthogonal antenna and adopts a so-called Yagi type configuration. That is, this antenna device 300 is arranged in the same position as the first Yagi / Uda antenna 310 and the first Yagi / Uda antenna 310 in the same directivity direction Z and rotated 90 degrees about the directivity direction Z. The second Yagi / Uda antenna 320 is provided. The first Yagi / Uda antenna 310 includes a reflector 311, a radiator 312, and waveguides 313 and 314 formed of metal poles in order from the rear in the radio wave radiation direction. The reflector 311, the radiator 312, and the directors 313 and 314 are attached to the support 330 and fixed.

  The antenna device 300 is designed for use in the 2.4 GHz band, and the lengths of the reflector 311, the radiator 312, and the waveguides 313 and 314 are about 100 mm to 125 mm, respectively. The distance from the reflector 311 to the director 313 is about 120 mm. On the other hand, the second Yagi / Uda antenna 320 includes a reflector 321, a radiator 322, and waveguides 323 and 324. These reflector 321, radiator 322, and directors 323 and 324 are also attached to and fixed to the column 330. The length and interval of each reflector 321, radiator 322, and director 323 of the second Yagi / Uda antenna 320 is the same as that of the first Yagi / Uda antenna 310 in the frequency band of the radio wave used. Therefore, the first Yagi / Uda antenna 310 is configured in the same manner. The radiators of the first and second Yagi / Uda antennas 310 and 320 are connected to power supply / reception lines 341 and 342 for receiving and supplying power from the transmission circuit or the reception circuit, respectively.

  As described above, the antenna device 300 according to the second embodiment employs the first and second Yagi / Uda antennas 310 and 320 rotated about 90 degrees about the directivity direction Z as an axis. . Therefore, multiplexed communication can be performed between the access point and the terminal of the wireless LAN system using the Yagi / Uda antennas 310 and 320 by the multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM). . An access point and a terminal using the antenna device 300 secure different paths in wireless communication by utilizing the difference in the polarization plane of the radio wave between the two Yagi / Uda antennas 310 and 320. For this reason, even if the distance between the access point and the terminal is separated, the difference in the route on the wireless communication cannot be maintained due to the distance difference. As a result, there is an advantage that the communication distance can be extended or the communication speed can be kept sufficiently high. The Yagi-Uda antenna can extend the distance of multiplexed communications, coupled with its extremely high directivity. In this embodiment, two Yagi / Uda antennas are combined, but three or more Yagi / Uda antennas may be combined. In the case of combining N Yagi / Uda antennas, the angle of each antenna may be shifted by 180 / N degrees with the direction Z of directivity as an axis.

[Modification]
A modification of the second embodiment will be described. FIG. 6 is an explanatory diagram showing an antenna device 400 as a modification of the second embodiment. In this antenna device 400, two Yagi-Uda antennas are formed by conductors on a substrate having a high dielectric constant. As shown in the figure, the first and second Yagi / Uda antennas 410 and 420 of the antenna device 400 are antennas having substantially the same shape, and the shape is shown in FIG. The first Yagi-Uda antenna 410 includes a reflector 411, a radiator 412 and a radiator 412, which are formed on a dielectric substrate having a dielectric constant of 4 as a metal conductor pattern in order from the rear of the radio wave radiation direction. Directors 413 and 414 are provided. A power supply line 441 is connected to the radiator 412. A conductor pattern 430 is also provided at the center of the reflector 411, the radiator 412, and the wave guides 413 and 414. The conductor pattern 430 is formed by the support pillar 330 (FIG. 5) of the first embodiment. As in the case of (see), since the electric field is zero, the performance is not affected even if it is not.

  Since the first Yagi-Uda antenna 410 is provided on a dielectric having a dielectric constant of 4, the shape thereof is greatly reduced. That is, the width W1 of the reflector 411 can be about 50 mm, the width W2 of the radiator 412 can be about 50 mm, and the widths W3 and W4 of the directors 413 and 414 can be 40 mm and 35 mm, respectively. The separation distance L1 between the reflector 411 and the radiator 412 is about 20 mm, the separation distance L2 between the radiator 412 and the director 413 is about 10 mm, and the separation distance L3 between the two directors 413 and 414 is about 30 mm. is there. Further, the total length LL of the substrate 401 is only 80 mm.

  On the other hand, the second Yagi / Uda antenna 420 has basically the same shape, and the other feeder line 442 is connected to the radiator. Both antennas 410 and 420 are provided at the center from different directions, and are integrated as an antenna device 400 by combining both substrates 401 and 402. Since the two substrates 401 and 402 are vertically combined, the polarization planes of the two Yagi / Uda antennas 410 and 420 are rotated by 90 degrees about the direction Z of directivity.

  In the antenna device 400 according to the modified example, since the substrates 401 and 402 having a high dielectric constant are used, the Yagi / Uda antennas 410 and 420 can be downsized as compared with the second embodiment. In fact, comparing FIG. 5 with FIG. 6, the relative dimension is about 1/3 to about 1/2, and the overall size is reduced. In addition, in order to increase the communication distance, it is not necessary to increase the distance between the two antennas. Therefore, it is possible to easily provide a small and compact wireless LAN access point and a terminal that communicates therewith. In addition, since the conductor pattern is formed directly on the substrate having a high dielectric constant, the cost and process required for manufacturing the antenna device 400 can be reduced.

  Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various modes within the scope not changing the gist of the present invention. is there. For example, the orthogonal antenna is not limited to a linearly polarized wave, and an antenna whose polarization plane turns to the right and an antenna that turns to the left can be used in combination. It is also possible to use in a frequency band other than 2.4 GHz.

It is explanatory drawing which shows schematic structure of the wireless LAN system using the antenna apparatus which is an Example of this invention. It is explanatory drawing which shows the external appearance of the access point of 1st Example. It is explanatory drawing which shows the external appearance of the terminal and antenna apparatus of 1st Example. It is explanatory drawing which shows the external appearance of an antenna apparatus. It is explanatory drawing which shows the external appearance of the antenna apparatus of 2nd Example. It is explanatory drawing which shows the modification of 2nd Example. It is explanatory drawing which shows schematic structure of each Yagi and Uda antenna which comprises the antenna apparatus of a modification similarly. It is explanatory drawing which shows an example of schematic structure of the access point which can be transmitted / received concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10a ... Access point 11 ... Housing | casing 12, 12a ... Interface 13 ... Connector 14 ... Switching part 14a ... 1st switching part 14b ... 2nd switching part 15 ... Demultiplexer 17, 18 ... Transmission circuit 19 ... Cover 20 ... terminals 21, 22 ... receiving circuit 25 ... multiplexer 27 ... interface 30 ... wireless LAN system 40 ... WAN
50 ... Computer 100, 200 ... Antenna device 111, 112 ... Metal plate 121, 122 ... Post 131, 132 ... Power supply / reception line 201 ... Housing 205 ... Cable 210 ... USB connector 300 ... Antenna device 310, 320 ... Yagi / Uda antenna 311, 321... Reflector 312, 322... Radiator 313, 314, 323, 324... Waveguide 330 .. support 341, 342 .. power feed line 400 .. antenna device 401, 402. 2 Yagi-Uda antenna 411 ... reflector 412 ... radiators 413 and 414 ... director 430 ... conductor pattern 441 ... feed line

Claims (14)

A multiplex input / output communication device capable of communicating multiplexed data with other communication devices,
An antenna device capable of communication using a plurality of polarized waves;
A transmission circuit that divides data to be transmitted and multiplexes and transmits the data by a plurality of polarizations of the antenna device;
A multiplex input / output communication apparatus comprising: a reception circuit that receives the data by separating a signal multiplexed on the other communication apparatus side from a signal received by the antenna apparatus using a plurality of polarized waves.   The multiplex input / output communication apparatus according to claim 1, wherein the antenna apparatus is an orthogonal antenna.   The orthogonal antenna includes a plate-shaped ground plate, a plate-shaped radiating element provided on the ground plate at a predetermined distance, and a power receiving / feeding terminal that receives and supplies power to different positions on the phase of the radiating element. The multiplex input / output communication apparatus according to claim 2, wherein the antenna is a patch-type orthogonal antenna.   The multiplex input / output communication apparatus according to claim 3, wherein the radiating element is square or circular.   The orthogonal antenna includes a first Yagi / Uda antenna composed of a reflector, a radiator, and a waveguide arranged in order from the rear end side, and a reflector, radiator, and waveguide arranged in order from the rear end side. A second Yagi / Uda antenna having the same direction as the first Yagi / Uda antenna and rotated by a predetermined angle about the direction of the directivity, and the first and second Yagi / Uda antennas. The multiplex input / output communication apparatus according to claim 2, which is a Yagi type orthogonal antenna provided with a power feed line for feeding power to each of the radiators.   6. The multiplex input / output communication apparatus according to claim 1, wherein the reception circuit includes a circuit that multiplies a reception signal by a predetermined reception weight and separates a plurality of data from the received signal.   6. The multiplex input / output communication apparatus according to claim 1, wherein said other communication apparatus performs eigenmode transmission in which information on a transmission path is shared and transmitted / received. The transmission circuit includes a circuit that processes data to be multiplexed in advance and encodes the data in a space-time domain,
8. The multiple input / output communication according to claim 1, wherein the receiving circuit separates the signal from the received signal using a decoding technique corresponding to the encoding technique in the transmitting circuit. apparatus.   9. The multiple input / output communication apparatus according to claim 8, wherein the encoding method is either a space-time block code (STBC) or a space-time trellis code (STTC). An antenna device used for at least one of a wireless LAN terminal and an access point that performs wireless communication by a multiple input / output method,
A plate-shaped ground plate;
A plate-like radiation element provided on the ground plate at a predetermined distance;
A patch-type orthogonal antenna device comprising a power supply terminal that supplies power to different positions on the phase of the radiation element. An antenna device used for at least one of a wireless LAN terminal and an access point that performs wireless communication by a multiple input / output method,
A first Yagi-Uda antenna having a reflector, a radiator, and a director arranged in order from the rear end side;
A second Yagi having a reflector, a radiator, and a director arranged in order from the rear end side and having the same directivity direction as the first Yagi / Uda antenna and rotated by a predetermined angle about the directivity direction・ Uda antenna and
A Yagi-type orthogonal antenna device comprising a feed line that feeds power to the radiators of the first and second Yagi / Uda antennas. The antenna device according to claim 11, wherein
Each of the first and second Yagi / Uda antennas is an antenna device in which the reflector, radiator, and director are formed as conductors on a substrate having a predetermined dielectric constant. A communication system that performs wireless communication by a multiple input / output method between a transmitter and a receiver,
The transmitter is
A first antenna device that performs transmission using a plurality of polarized waves;
A transmission circuit that divides data to be transmitted and multiplexes and transmits the data by using a plurality of polarizations of the first antenna device;
The receiver
A second antenna device that performs reception using a plurality of polarized waves;
A communication system comprising: a reception circuit that receives the data by separating a signal multiplexed on the transmitter side from a signal received by the second antenna device using a plurality of polarized waves.   The communication system according to claim 13, wherein at least one of the first and second antenna devices is an orthogonal antenna.

Images