WO2019077787A1 - Mobile station and remote antenna system - Google Patents

Abstract

This mobile station is to be mounted on a device that is provided with a mobile device main body, and a movable section that is provided to the device main body. The mobile station is provided with: a first antenna that is disposed on the device main body; and a second antenna, which is disposed, on the device main body 11, at a position different from the position at which the first antenna is disposed, and which forms a beam directed toward a range that can be blocked by the movable section when viewed from the first antenna.

Description

Mobile station and remote antenna system

The present invention relates to mobile stations and remote antenna systems.
This application claims the priority based on Japanese Patent Application No. 2017-201893, filed Oct. 18, 2017, and incorporates all the contents described in the aforementioned Japanese application.

The mobile station may be required to transmit and receive radio waves in a specific direction. For example, in a communication system using a high frequency, compared to a communication system using a low frequency, a radio wave is less likely to reach, and a beam formed by an antenna is directed in a specific direction in which a base station is present. Control of beam directivity is disclosed in, for example, Patent Document 1.

JP, 2016-116045, A

The present disclosure relates to a mobile station mounted on a device including a movable device body and a movable part provided in the device body. The mobile station is a first antenna disposed in the device main body and a second antenna disposed at a position different from the first antenna in the device main body, and is shielded by the movable portion as viewed from the first antenna. And a second antenna forming a beam pointing to a range that may be

The present disclosure relates to a remote antenna system mounted on a device including a movable device body and a movable part provided on the device body. The remote antenna system comprises a master unit connected to a mobile station main body outputting a radio frequency signal, a first slave unit provided with a first antenna disposed in the device main body, the master unit and the first slave unit A first transmission path for connecting the second antenna, and a second antenna disposed at a position different from the first antenna in the apparatus main body, to a range in which the movable portion may be shielded by the first antenna. And a second transmission path connecting the master unit and the second handset to each other.

FIG. 1 is a plan view of a construction machine. FIG. 2 is a side view of the construction machine. FIG. 3 is a circuit diagram of the mobile station. FIG. 4 is a circuit diagram of the transceiver. FIG. 5 is an explanatory view of a beam forming range. FIG. 6A is an explanatory view showing beam directivity before turning. FIG. 6B is an explanatory view showing the beam directivity after turning. FIG. 7 is a flow chart showing a beam directivity control procedure based on the turn data. FIG. 8 is an explanatory view of a variation of the arrangement of the slaves. FIG. 9 is a circuit diagram of a mobile station. FIG. 10 is a circuit diagram of a transceiver.

[Problems to be solved by the present disclosure]

In fifth generation mobile networks (5G), high frequencies such as millimeter waves or quasi-millimeter waves are used. In communications where high frequencies are used, the antenna directivity is narrow. Therefore, if the mobile station does not properly direct the beam to the base station with which it is communicating, communication becomes unstable. Moreover, even if the beam is properly directed to the base station, if there is a shield between the mobile station and the base station, communication will be blocked and communication will be unstable.

Therefore, it is desirable that the mobile station be placed in a position where communication is not blocked by the shield. However, when the mobile station is mounted on a device having a movable part, such as a construction machine, the wider the movable range of the movable part, the wider the range in which communication is blocked. For this reason, it is not easy to stabilize communication while mounting a mobile station on a device having a movable part like a construction machine.

For example, in a hydraulic shovel, which is a type of construction machine, a movable unit including a boom, an arm, and a bucket is provided in an apparatus main body movable by a crawler. When a mobile station is mounted on the main body of such a hydraulic excavator, the movable unit may be located in the direction of the base station as viewed from the mobile station, and the movable unit serves as a shield to communicate with the base station. May interfere with

Therefore, even when the mobile station is mounted on a device provided with a movable unit, it is required to suppress the obstruction of communication.

[Effect of the present disclosure]
According to the present disclosure, even when the mobile station is mounted on a device including a movable unit, it is possible to suppress that communication is blocked.

[1. Outline of embodiment]
(1) The mobile station according to the embodiment is mounted on a device including a movable device body and a movable part provided in the device body. The device on which the mobile station is mounted is, for example, a construction machine, an agricultural machine, or an industrial machine. The construction machine is, for example, a bulldozer, a hydraulic shovel, a crawler loader, a wheel loader, or a wheel crane. The agricultural machine is, for example, a tractor. The industrial machine is, for example, a forklift. The device on which the mobile station is mounted may be, for example, a large special vehicle or a small special vehicle defined in Appendix 1 of the Road Transport Vehicle Act Enforcement Regulations of Japan.

The movable device body includes, for example, a traveling body having a crawler or wheels. The traveling body causes the device on which the mobile station is mounted to travel freely. The device body may include a driver's seat. The device body is also called an airframe. In the device on which the mobile station is mounted, the portion on which the first antenna and the second antenna described later are mounted may be regarded as the device body. The device body may include a movable portion within the device body, such as a swing body pivotally mounted on the traveling body.

The movable part operates, for example, for purposes other than movement of the device. The movable part is, for example, a mechanism for performing work other than movement of the apparatus. Operations other than movement are, for example, construction operations, civil engineering operations, agricultural operations, cargo handling operations, or assembly operations. The movable portion changes its relative position with respect to the device body by its operation.

The mobile station may include a first antenna disposed in the device body and a second antenna disposed in the device body at a position different from the first antenna. The second antenna forms a beam directed to an area which may be shielded by the movable part as viewed from the first antenna. The range which may be shielded by the movable part as viewed from the first antenna is a range which may be out of sight by the movable part as viewed from the first antenna. The movable portion changes its position or posture, etc., and its relative positional relationship with the first antenna changes. For this reason, when viewed from the first antenna, the entire movable range of the movable portion is a range that can be shielded by the movable portion.

The second antenna forms a beam directed to an area which may be shielded by the movable part as viewed from the first antenna. Therefore, even if the movable part is positioned in the direction from the first antenna to the base station, the second antenna can form a beam directed to the base station.

The first antenna does not have to be capable of forming a beam directed to a range that may be shielded by the movable portion.

(2) The mobile station connects the master unit connected to the mobile station main body outputting the radio frequency signal, the first slave unit provided with the first antenna, the master unit and the first slave unit 1 transmission line, a second handset including the second antenna, and a second transmission path connecting the master and the second handset
Can be provided. In this case, it is easy to arrange the first antenna and the second antenna apart from the mobile station body. In addition, it is easy to arrange the first antenna and the second antenna apart from each other.

(3) The base unit can convert the radio frequency signal received from the mobile station main body into an intermediate frequency signal, and output the intermediate frequency signal to the first transmission path or the second transmission path. The first slave unit may convert the intermediate frequency signal received from the master unit via the first transmission path into a radio frequency signal, and form a beam of the radio frequency signal by the first antenna. . The second slave unit may convert the intermediate frequency signal received from the master unit through the second transmission path into a radio frequency signal, and form a beam of the radio frequency signal by the second antenna. . Since the signal transmitted between the master unit and the slave unit is an intermediate frequency signal, signal attenuation can be suppressed as compared with the case of transmitting a radio frequency signal.

(4) The first slave unit can convert a radio frequency signal received by the first antenna into an intermediate frequency and output the intermediate frequency signal to the first transmission path. The second slave unit can convert a radio frequency signal received by the second antenna into an intermediate frequency, and output the intermediate frequency signal to the second transmission path. The master unit converts the intermediate frequency signal received from the first handset or the second handset via the first transmission path or the second transport path into a radio frequency signal, and the radio frequency signal It can be output to the mobile station body. Since the signal transmitted between the master unit and the slave unit is an intermediate frequency signal, signal attenuation can be suppressed as compared with the case of transmitting a radio frequency signal.

(5) The first handset and the second handset may each include an amplifier for amplifying the radio frequency signal. By the amplifier, the slave equipped with the antenna can increase the signal strength in the vicinity of the antenna by providing the amplifier.

(6) The master unit can include a first selector for selecting a slave unit to which a signal output from the master unit is given. By means of the first selector, it is possible to select a slave to which a signal is given. The first selector may select one slave unit, but may select a plurality of devices if necessary.

(7) The at least one antenna of the first antenna and the second antenna may include a plurality of array antennas capable of forming beams within a plurality of different angle ranges. The plurality of angle ranges may or may not partially overlap each other. The cordless handset provided with the plurality of array antennas among the first cordless handset and the second cordless handset further comprises a second selector for selecting which of the plurality of array antennas to apply the radio frequency signal to. it can. The second selector allows to select an array antenna to which a signal is given.

(8) The plurality of array antennas can change the directivity of the beam within a plurality of different angle ranges. In this case, the directivity of the beam can be finely adjusted.

(9) The device main body can include a traveling body and a revolving body that pivots on the traveling body. The selection by the first selector may be made based on data indicating the pivoting of the pivoting body. In this case, the directivity of the beam can be quickly adjusted according to the turning of the turning body.

(10) The device main body can include a traveling body and a revolving body that pivots on the traveling body. The selection by the second selector may be made based on data indicating the pivoting of the pivoting body. In this case, the directivity of the beam can be quickly adjusted according to the turning of the turning body.

(11) The device main body can include a traveling body and a revolving body that pivots on the traveling body. The change in directivity of the beam may be performed based on data indicating the turning of the turning body. In this case, the directivity of the beam can be quickly adjusted according to the turning of the turning body.

(12) Preferably, the first antenna and the second antenna are for millimeter waves or quasi-millimeter waves. With millimeter waves or quasi-millimeter waves, the straightness of radio waves is high, and it is required to direct the beam reliably to the other party of communication, so stable communication is possible by mutually compensating the communication range with the first antenna and the second antenna. It becomes.

(13) The mobile station is preferably used to transmit image data captured by a camera included in the device. The image data is used, for example, for remote control of the device. Therefore, for a mobile station transmitting such image data, maintenance of stable communication is particularly required, and it is particularly useful to mutually compensate the communication range by the first antenna and the second antenna.

(14) The device main body can include a traveling body and a revolving body that pivots on the traveling body. A plurality of antennas including the first antenna and the second antenna compensate each other for an angle range in which the beams can be formed so that the beam can be formed in any direction within a 360 ° range in the horizontal plane It is preferable to arrange | position to the said rotational body. In this case, the beam can be formed in any direction within the range of 360 ° in the horizontal plane.

(15) The remote antenna system according to the embodiment is mounted on a device including a movable device body and a movable portion provided on the device body. The remote antenna system comprises a master unit connected to a mobile station main body outputting a radio frequency signal, a first slave unit provided with a first antenna disposed in the device main body, the master unit and the first slave unit A first transmission path for connecting the second antenna, and a second antenna disposed at a position different from the first antenna in the apparatus main body, to a range in which the movable portion may be shielded by the first antenna. And a second transmission path connecting the master unit and the second handset to each other.

[2. Details of the embodiment]

[2.1 Equipment equipped with mobile station]

1 and 2 show a construction machine as an example of the device 10 on which the mobile station 200 is mounted. The illustrated construction machine 10 is a hydraulic shovel. The construction machine 10 includes an apparatus main body 11 and a movable unit 16. The device body 11 includes a traveling body 13 and a revolving body 14. The traveling body 13 is provided with an endless track for self-propelled travel. The revolving unit 14 is pivotally mounted on the traveling unit 13. The pivoting body 14 can pivot horizontally 360 ° around the vertical axis. The revolving unit 14 includes a driver's seat 15. The construction machine 10 is operated by the driver of the driver's seat 15 for operation for movement and operation for work.

The illustrated movable portion 16 is a device for excavating earth and sand, and is provided on the rotating body 14 so as to be capable of raising and lowering. The movable portion 16 can also pivot about the vertical axis as the pivoting body 14 pivots. The illustrated movable portion 16 is a front portion of the swing body 14 and is provided with a boom 17 provided movably on the side of the driver's seat 15, an arm 18 provided at the tip of the boom 17 and a tip of the arm 18 And the bucket 19 provided in The movable part 16 is operated by a hydraulic cylinder. The movable portion 16 is operable in the front and upper ranges of the swing body 14 and has a wide movable range.

The construction machine 10 is also capable of remote control via a mobile communication network. For remote control, the construction machine 10 is equipped with one or more cameras 30 and can capture the surroundings of the construction machine 10 or the construction machine 10 itself. The camera 30 is attached to the arm 18, for example. Image data captured by the camera 30 is transmitted from the mobile station 200 mounted on the construction machine 10 to the remote control system 40 via the mobile communication network. The remote control system 40 transmits a command for remote control to the construction machine 10 via the mobile communication network. The remote control of the construction machine 10 may be performed automatically by a computer or manually by an operator. The operator can operate the remote control system 40 and remotely control the construction machine 10 while viewing the image transmitted from the construction machine 10.

The construction machine 10 is equipped with a mobile station 200 for mobile communication. The mobile station 200 transmits image data captured by the camera 30 and receives an operation command of the construction machine 10. The construction machine 10 travels and works according to the operation command received by the mobile station 200.

The mobile station 200 communicates with the base station 100 for data transmission / reception with the remote control system 40. The base station 100 is installed at a relatively high location, such as the roof of a building or above a steel tower, and communicates with the mobile station 200. The base station 100 is preferably installed at a relatively high place in or near the construction site for communication with the mobile station 200 mounted on the construction machine 10. Mobile communication is preferably communication in which millimeter waves or quasi-millimeter waves are used in order to realize high-speed communication. Mobile communication in which millimeter waves or quasi-millimeter waves are used is, for example, the fifth generation mobile network (5G). Communications in which millimeter waves or quasi-millimeter waves are used have high propagation losses due to high frequencies. In the present embodiment, beamforming is performed to compensate for the propagation loss. By beamforming, the directivity of the beam can be directed in a specific direction to improve the gain. Beamforming can be performed by both the base station 100 and the mobile station 200.

The mobile station 200 includes a mobile station main body 201 that outputs a radio frequency signal (hereinafter referred to as an RF signal). An RF signal is radiated from the antenna for signal transmission to the base station 100. Also, an RF signal is received by the antenna for signal reception from the base station 100. In a general mobile station 200, an antenna is connected to the mobile station body 201, but in the present embodiment, a remote antenna system 300 described below is connected to the mobile station body 201.

The remote antenna system 300 arranges the antennas 515, 525, 615, 625 at positions away from the mobile station body 201. The remote antenna system 300 includes a master unit 400 connected to the mobile station main body 201 and a plurality of slave units 500 and 600. Each of the plurality of handsets 500, 600 includes an antenna 515, 525, 615, 625, respectively. In the present embodiment, the number of slaves is two, but may be three or more. The master unit 400 and the slave unit (first slave unit) 500 are connected by a first transmission path 700, and the master unit 400 and the slave unit (second slave unit) 600 are connected by a second transmission path 800. . The first transmission path 700 and the second transmission path 800 are, for example, cables for signal transmission.

Since master unit 400 and slave units 500, 600 are connected via transmission lines 700, 800, slave units 500, 600 should be arranged separately from mobile station main body 201 to which master unit 400 is connected. Is possible. Since the separated slave units 500 and 600 can be miniaturized, the degree of freedom of the installation place is increased, and can be easily installed in the clearance space of the construction machine 10 or the like. In addition, it is easy to arrange the first handset 500 and the second handset 600 at different positions. Therefore, antennas 515, 525, 615, 625 provided in handsets 500, 600 can be arranged in construction machine 10 at a position suitable for communication with base station 100. Further, by disposing a plurality of handsets 500, 600 each having an antenna 515, 525, 615, 625 in a distributed manner in the construction machine 10, the antennas 515, 525, 615, 625 can be disposed in a distributed manner.

The master unit 400 receives an RF signal output from the mobile station main body 201, and transmits the received signal to any one or more of the plurality of slave units 500 and 600. The signal transmitted from the master unit 400 to the slave units 500 and 600 may be an RF signal or an intermediate frequency signal (hereinafter referred to as an IF signal) as described later. The IF signal is a signal having a frequency lower than that of the RF signal, and can be obtained by frequency converting (down converting) the RF signal received by the parent device 400.

When the master unit 400 transmits an IF signal to the slave units 500 and 600, the slave units 500 and 600 frequency convert (up convert) the received IF signal into an RF signal. As a result, the slave units 500 and 600 obtain an RF signal similar to the RF signal output from the mobile station main body 201. The slaves 500, 600 transmit the obtained RF signals from the antennas 515, 525, 615, 625. Also, the slaves 500 and 600 receive the RF signals transmitted from the base station via the antennas 515, 525, 615 and 625. The slave units 500 and 600 frequency convert (down convert) the received RF signal into an IF signal, and transmit the IF signal to the master unit 400. The master unit 400 frequency-converts (up-converts) the received IF signal into an RF signal, and supplies the RF signal to the mobile station body 201.

Cable connection between master unit 400 and slave units 500, 600 by performing signal transmission between master unit 400 and slave units 500, 600 at an intermediate frequency sufficiently lower than the carrier frequency of the RF signal. Even then, signal attenuation can be suppressed.

FIG. 3 shows the configuration of the remote antenna system 300. As shown in FIG. Master unit 400 has a horizontal polarization terminal 401 for receiving an RF signal of horizontal polarization (H polarization) output from mobile station main body 201, and a vertical polarization (V polarization) output from mobile station main body 201 as well. And a vertically polarized terminal 402 for receiving the RF signal. The RF signal output from the mobile station main body 201 is, for example, a signal whose carrier frequency is 28 GHz. The RF signal received by base unit 400 from mobile station main body 201 is downconverted by base unit 400. For example, the RF signal of horizontal polarization is down converted by the frequency converter 404 into an IF signal. The vertically polarized RF signal is down converted by the frequency converter 405 into an IF signal. The IF signal is, for example, a signal of about 3 G to 5 GHz. If the signal transmitted between master unit 400 and slave units 500 and 600 is an RF signal, frequency converters 404 and 405 may be omitted.

The master unit 400 includes a control terminal 403 for receiving a control signal from the mobile station main body 201. The control signal from the mobile station main body 201 will be described later.

Master device 400 includes first selectors 406 and 407 for selecting a slave device responsible for signal transmission and reception among first slave device 500 and second slave device 600. Specifically, the first selectors 406 and 407 select which of the plurality of slaves 500 and 600 the signal transmitted from the master 400 to the slaves 500 and 600 is to be provided. This selection is also the selection of which mobile station 500, 600 the signal received by the mobile station body 201 is to be given. Here, the signals transmitted and received between the parent device 400 and the child devices 500 and 600 are IF signals of horizontally polarized waves and IF signals of vertically polarized waves.

The first selector 406 selects whether to apply the horizontally polarized IF signal for transmission to the first handset 500 or to the second handset 600. The first selector 407 selects whether to apply the vertically polarized IF signal for transmission to the first handset 500 or to the second handset 600. This selection is also a selection of which mobile station 500, 600 the signal received by the mobile station body 201 is to be given.

When the first child device 500 is selected by the first selectors 406 and 407, the horizontally polarized IF signal and the vertically polarized IF signal are transmitted to the first child device 500 via the first transmission path 700. Given. Also, the IF signal transmitted from the first slave unit 500 is upconverted by the master unit 400 into an RF signal, and given to the mobile station main body 201.

When the second child device 600 is selected by the first selectors 406 and 407, the horizontally polarized IF signal and the vertically polarized IF signal are transmitted to the second child device 600 via the second transmission path 800. Given. Also, the IF signal transmitted from second slave unit 600 is upconverted to an RF signal by master unit 400, and is provided to mobile station main body 201.

The selection by the first selectors 406 and 407 is controlled by the controller 408 provided in the parent device 400. The control by the controller 408 will be described later. The controller 408 is, for example, a computer including a CPU, a storage device, and the like.

The parent device 400 includes a control signal superposition and separation unit 409. The superposition and separation unit 409 superimposes the control signal transmitted to the slave units 500 and 600 on the IF signal of horizontal polarization, and separates the control signal from the IF signal transmitted from the slave units 500 and 600. The control signal transmitted to the slave units 500 and 600 is supplied from the controller 408, and the control signal transmitted from the slave units 500 and 600 is supplied to the controller 408. In addition, the superimposition separation unit 409 may be provided in a path for vertical polarization in the parent device 400.

By superimposing the control signal on the IF signal, transmission of the control signal between the master unit 400 and the slave units 500 and 600 can be performed by the transmission lines 700 and 800 for IF signal transmission, and the master unit 400 It is possible to reduce the number of transmission paths between and the slaves 500 and 600.

The first slave unit 500 up-converts the IF signal received from the master unit 400 via the first transmission path 700 to obtain an RF signal. For example, the horizontally polarized IF signal is upconverted by the frequency converter 501 into an RF signal. The vertically polarized IF signal is upconverted by the frequency converter 502 into an RF signal.

The frequency converter 501 also has a function of down-converting the horizontally polarized RF signal received by the first handset 500 into an IF signal, and the frequency converter 502 receives the vertical polarization received by the first handset 500. It also has the function of down converting a wave RF signal to an IF signal.

The first child device 500 includes a superposition separation unit 503. The superimposition / separation unit 503 separates the control signal from the IF signal transmitted from the parent device 400, and superimposes the control signal transmitted to the parent device 400 on the horizontally polarized IF signal. The control signal transmitted to master device 400 is provided from controller 530, and the control signal transmitted from master device 400 is provided to controller 530. Note that superimposing / separating unit 503 may be provided in a path for vertical polarization in slave unit 500. The controller 530 is, for example, a computer provided with a CPU, a storage device, and the like.

The first handset 500 includes first antennas 515 and 525. In the embodiment, the first handset 500 includes a plurality of units 510 and 520, and each of the plurality of units 510 and 520 includes a first antenna 515 and 525. In the embodiment, the plurality of units 510 and 520 include a first unit 510 and a second unit 520. The number of units 510 and 520 may be three or more.

The first antenna 515 included in the first unit 510 is a shared antenna of horizontal polarization and vertical polarization. In an embodiment, the first antenna 515 comprises an array antenna (first array antenna). The array antenna as the first antenna 515 includes a first receiving array antenna 517 and a first transmitting array antenna 519. The first reception array antenna 517 includes a first reception antenna element 517a, a second reception antenna element 517b, a third reception antenna element 517c, and a fourth reception antenna element 517d. The first transmitting array antenna 519 includes a first transmitting antenna element 519a, a second transmitting antenna element 519b, a third transmitting antenna element 519c, and a fourth transmitting antenna element 519d. Each of the antenna elements 517a to 517d and 519a to 519d is a shared antenna element of horizontal polarization and vertical polarization.

The first unit 510 includes RF signal combining / dividing devices 511a and 511b. The combiner / splitter 511a splits and combines horizontally polarized RF signals. For example, the RF signal of horizontal polarization for transmission is divided into four by the combiner / splitter 511a, and is transmitted to four transmit antenna elements 519a, 519b, 519c, 519d via four transceivers 513a, 513b, 513c, 513d. Given. The vertically polarized RF signal for transmission is divided into four by the combiner / splitter 511b, and provided to the four transmit antenna elements 519a, 519b, 519c, 519d via the four transceivers 513a, 513b, 513c, 513d. .

The horizontally polarized RF signals received by the four receive antenna elements 517a, 517b, 517c, 517d are applied to the combiner / splitter 511a via the four transceivers 513a, 513b, 513c, 513d and combined. The vertically polarized RF signals received by the four receive antenna elements 517a, 517b, 517c, 517d are applied to the combiner / splitter 511b via the four transceivers 513a, 513b, 513c, 513d and combined.

As shown in FIG. 4, the transceivers 513 a, 513 b, 513 c, and 513 d include a transmission system 550 and a reception system 560. The transmission system 550 and the reception system 560 are switched by the switch 540 in a time division manner.

The transmission system 550 includes an amplifier (power amplifier) 551 that amplifies the RF signal to be transmitted. Even if there is signal attenuation due to the transmission from the mobile station main body 201 to the child device 500, the signal attenuation can be compensated by amplifying the RF signal by the amplifier 551. The transmission system 550 also includes an amplitude adjuster 553 and a phase shifter 555. The directivity of the transmission beam can be adjusted by adjusting the amplitude and phase of the RF signal in each of the transceivers 513a, 513b, 513c, and 513d.

The reception system 560 includes an amplifier (low noise amplifier) 556. The amplifier 556 can compensate for signal attenuation due to signal transmission from the slave unit 500 to the mobile station main body 201. The reception system 560 also includes an amplitude adjuster 563 and a phase shifter 565. The directivity of the receiving beam can be adjusted by adjusting the amplitude and phase of the RF signal in each of the transceivers 513a, 513b, 513c, and 513d.

The switch 540, the amplitude adjusters 553 and 563, and the phase shifters 555 and 565 are controlled by the controller 530 included in the slave unit 500. The control by the controller 530 will be described later.

The second unit 520 has the same configuration as the first unit 510. The first antenna 525 included in the second unit 520 is also similar to the first antenna 515 included in the first unit 510. That is, the first antenna 525 includes an array antenna. The array antenna as the first antenna 525 includes a first receiving array antenna 527 and a first transmitting array antenna 529. The first reception array antenna 527 includes a first reception antenna element 527a, a second reception antenna element 527b, a third reception antenna element 527c, and a fourth reception antenna element 527d. The first transmitting array antenna 529 includes a first transmitting antenna element 529a, a second transmitting antenna element 529b, a third transmitting antenna element 529c, and a fourth transmitting antenna element 529d. Each of the antenna elements 527a to 527d and 529a to 529d is a shared antenna element of horizontal polarization and vertical polarization.

The second unit 520 includes an RF signal combiner / splitter 521a, 521b. The combiner / splitter 521a splits and combines horizontally polarized RF signals. For example, the RF signal of horizontal polarization for transmission is divided into four by the combiner / splitter 521a, and is transmitted to the four transmit antenna elements 529a, 529b, 529c, 529d via the four transceivers 523a, 523b, 523c, 523d. Given. The vertically polarized RF signal for transmission is divided into four by the combiner / splitter 521b, and given to the four transmit antenna elements 529a, 529b, 529c, 529d via the four transceivers 523a, 523b, 523c, 523d. .

The horizontally polarized RF signals received by the four receive antenna elements 527a, 527b, 527c, and 527d are supplied to the combiner / splitter 521a via the four transceivers 523a, 523b, 523c, and 523d, and then combined. The vertically polarized RF signals received by the four receive antenna elements 527a, 527b, 527c, and 527d are supplied to the combiner / splitter 521b via the four transceivers 523a, 523b, 523c, and 523d, and then combined.

The configuration of the transceivers 523a, 523b, 523c, 523d of the second unit 520 is also as shown in FIG.

The first handset 500 includes second selectors 504 and 505 for selecting a unit responsible for signal transmission and reception among the first unit 510 and the second unit 520. The selection by the second selectors 504 and 505 is also a selection of a unit responsible for signal transmission and reception among the plurality of antennas 515 and 525.

For example, the second selector 504 selects which of the plurality of transmitting array antennas 519 and 529 to apply a horizontally polarized RF signal for transmission. This selection is also for selecting which of the plurality of receiving array antennas 517 and 527 down-converts the RF signal received by the antenna and transmits it to the parent device 400.

The second selector 505 selects which one of the plurality of transmitting array antennas 519 and 529 to apply the RF signal of vertical polarization for transmission. This selection is also for selecting which of the plurality of receiving array antennas 517 and 527 down-converts the RF signal received by the antenna and transmits it to the parent device 400.

When the second antennas 504 and 505 select the array antennas 517 and 519 of the first unit 510 as an array antenna for transmitting and receiving RF signals, the second selectors 504 and 505 receive horizontal polarization and vertical polarization, respectively. An RF signal is provided to the first unit 510. The RF signal provided to the first unit 510 is transmitted by the first transmitting array antenna 519. Also, the RF signal received by the first unit 510 is down-converted to an IF signal and transmitted to the parent device 400.

When the second selectors 505 and 505 select the array antenna 517 and 519 of the second unit as an array antenna for transmitting and receiving RF signals, the second selectors 504 and 505 can generate RF of horizontally polarized waves and vertically polarized waves. A signal is provided to the second unit 520. The RF signal provided to the second unit 520 is transmitted by the first transmission array antenna 529. Also, the RF signal received by the second unit 520 is down-converted to an IF signal and transmitted to the parent device 400.

The selectors by the second selectors 504 and 505 are controlled by the controller 530 included in the first handset 500. The control by the controller 530 will be described later.

Second handset 600 has the same configuration as first handset 500. However, while the antennas 515 and 525 included in the first handset 500 are referred to as first antennas 515 and 525, the antennas 615 and 625 included in the second handset 600 are referred to as second antennas 615 and 625. Call. As described above, the antennas 515, 525, 615, 625 are array antennas, respectively, and can adjust beam directivity.

As shown in FIG. 5, the four array antennas 515, 525, 615, 625 compensate for the beam forming in the 360 ° angle range in the horizontal plane. For example, the array antenna 515 is responsible for beamforming within an angular range A1 of 1/4 of the 360 angular range in the horizontal plane. The array antenna 525 is responsible for beamforming within the other quarter of the angular range A2. The array antenna 515 is responsible for beamforming within the other quarter angular range B1. The array antenna 625 is responsible for beamforming within the other quarter angular range B2. Each array antenna 515, 525, 615, 625 can change the directivity of the beam in the angular range A1, A2, B1, B2 responsible for beam forming. Here, each angle range A1, A2, B1, B2 is 90 degrees. In FIG. 4, the angular ranges A1, A2, B1 and B2 do not overlap with each other, but may overlap with each other.

The first handset 500 equipped with the two first array antennas 515 and 525 can be responsible for beam forming in the range A, which is the range A1 plus the range A2. In addition, the second handset 600 including the two second array antennas 615 and 625 can be responsible for beam forming in the range B in which the range B2 is added to the range B1. That is, the remote antenna system 300 can compensate for the beam formation in the angle range of the horizontal plane 360.degree.

In FIG. 5, the plurality of array antennas 515, 525, 615, 625 are arranged centrally in one place. However, as shown in FIG. 1, in this embodiment, in the construction machine 10, the first child device 500 and the second child device 600 are disposed in a distributed manner. For this reason, the first array antennas 515 and 525 included in the first handset 500 and the second array antennas 615 and 625 included in the second handset 600 are distributed and arranged.

In FIG. 1 and FIG. 2, the first slave unit 500 is disposed at the top of the driver seat 15 on the front right side of the swing body 14, and the second handset 600 is disposed at the rear left side of the swing body 14. The second slave unit 600 having the second array antenna 615, 625 is disposed at a different position from the first slave unit 500 having the first array antenna 515, 525 so that the communication by the movable unit 16 is blocked. It can be avoided.

For example, four array antennas 515, 525, 615, 625 are centrally arranged at one position as shown in FIG. 5 at the position of the first handset 500 in FIG. 1 (the front right side of the apparatus main body 11). Assume the case. In this case, as shown in FIG. 1, when the base station 100 is on the left front of the apparatus main body 11, there is a possibility that the movable part 16 exists in the direction from the position of the first handset 500 in FIG. Communication may be hampered. Moreover, as the movable range of the movable portion 16 is wider, communication is more likely to be hindered.

However, since a good view from the second handset 600 on the left side of the device main body 11 to the base station 100 on the left front side of the device main body 11 can be secured, communication interference by the movable unit 16 can be reduced.

That is, the antennas 515 and 525 included in the first handset 500 mainly perform beam forming in the range A on the right side of the construction machine 10, and the antennas 515 and 525 included in the second handset 600 mainly It is responsible for beamforming in the range B1 to the left of ten. The antennas 615 and 625 included in the second handset 600 form a beam directed to the left front area B1 that may be shielded by the movable portion 16 as viewed from the antennas 515 and 525 included in the first handset 500. it can. Therefore, regardless of the position / posture of the movable part 16, the movable part 16 can be avoided and beam formation can be performed by either the first handset 500 or the second handset 600.

Moreover, as shown in FIG. 1, the plurality of antennas 515, 525, 615, 625 mutually complement the angular ranges A1, A2, B1, B2 which can form a beam, and the angular ranges A, B of 360 ° in the horizontal plane It is possible to form a beam in any of these directions. As a result, regardless of the turning state of the turning body 14, it is possible to always cover the entire horizontal surface circumference as the communicable range.

It is preferable that the first handset 500 and the second handset 600 be disposed at mutually separated positions in at least one of the lateral direction X, the longitudinal direction Y, and the height direction Z of the construction machine 10. As a result, it is easy to secure the view to the base station 100 by either the first handset 500 or the second handset 600. In the case of the example shown in FIGS. 1 and 2, the first handset 500 and the second handset 600 are disposed apart from each other in all of the lateral direction X, the longitudinal direction Y and the height direction Z, With any of the first handset 500 and the second handset 600, it is easy to secure a view to the base station 100.

In remote antenna system 300, control of the directivity of the beam comprises selection of handsets 500, 600, selection of units 510, 520 in selected handsets 500, 600, and selected units 510, 520. The adjustment of the directivity of the beam by the array antenna 515, 525, 615, 625 is performed. This control determines the directivity of the beam in the 360 ° angular range of the horizontal plane.

For example, when a control signal indicating that the directivity of the beam should be set is given to master unit 400 from mobile station main body 201 in a certain direction D in the horizontal plane, controller 408 sets direction D to a range A and a range. It is determined to which of B it belongs. The controller 408 selects the first handset 500 when the direction D belongs to the range A, and selects the second handset 600 when the direction D belongs to the range B. The controller 408 controls the first selectors 406 and 407 so that an IF signal is exchanged between the parent device 400 and the first child device 500 when the first child device 500 is selected. When the second slave unit 600 is selected, the controller 408 controls the first selectors 406 and 407 so that an IF signal is exchanged between the master unit and the second slave unit 600. Note that the direction in which the beam is directed may be determined by the controller 408.

The control signal indicating the direction D is transmitted from the controller 408 of the parent device 400 to the controller 530 of the selected child device 500, 600 via the transmission paths 700 and 800. When the first handset 500 is selected, the controller 530 of the first handset 500 determines which one of the ranges A1 and A2 the direction D belongs to. The controller 530 selects the first unit 510 (first antenna 515) when the direction D belongs to the range A1, and selects the second unit 520 (first antenna 525) when the direction D belongs to the range A2. Choose When the controller 530 selects the first unit 510, the controller 530 controls the second selectors 504 and 505 to transmit and receive RF signals by the first unit 510. When the controller 530 selects the second unit 520, the controller 530 controls the second selectors 504 and 505 so that the second unit 520 transmits and receives RF signals.

When the second handset 600 is selected, the controller 530 of the second handset 600 operates in the same manner as the controller 530 of the first handset 500, and the first unit 510 (second antenna 615) or the second unit 520. (2nd antenna 625) is selected.

The controller 530 controls the amplitude adjusters 553, 563 and the phase shifters 555, 565 of the transceivers 513a, 513b, 513c, 513d connected to the antenna elements constituting the selected antenna 515, 525, 615, 625. By adjusting the amplitude and phase of the RF signal, the directivity of the beam can be set in the direction D.

Here, the direction D is generally the direction in which the base station 100 exists. The direction in which the base station 100 exists can be determined, for example, by scanning the strength of radio waves transmitted from the base station all around the horizontal direction in the mobile station 200, and determining the direction in which the radio waves are strongest as the direction of the base station. . The process of determining the direction D is performed by, for example, a processor included in the mobile station body 201.

The control of the directivity of the beam may be based on data (hereinafter, referred to as turning data) indicating the turning of the turning body 14 on which the mobile station 200 is mounted. The turning data indicates, for example, a turning amount (turning angle) and a turning direction. For example, as shown in FIG. 6A, when the mobile station 200 is communicating with the base station 100 by the antenna 515, an operation command to transmit 90 ° clockwise has been transmitted. I assume. In this case, the mobile station 200 changes the directivity of the beam counterclockwise in synchronization with the turning of the turning body 14. When the antenna 515 can not form a beam directed to the base station 100 as it turns, the antenna forming the beam is switched from the antenna 515 to the antenna 615 as shown in FIG. 6B. Thus, it is possible to keep the beam directed to the base station 100 at all times.

FIG. 7 shows an example of a beam directivity control procedure based on turning data. In step S11, the mobile station main body 201 receives an operation command from the remote control system 40. If the operation command includes turning data indicating a turning amount and a turning direction, the mobile station main body 201 transmits a control signal including the turning data to the controller 408 of the parent device 400 in step S12.

When the controller 408 receives the control signal including the turn data in step S21, the controller 408 selects the slave units 500 and 600 based on the turn data in step S21. The selection of the slaves 500 and 600 is made based on the direction in which the beam should be directed when the swing body 14 swings based on the swing data. In step S23, the controller 408 controls the selectors 406 and 407 such that signal exchange is performed between the selected slave units 500 and 600. At step S24, the controller 408 transmits a control signal including the turning data to the controller 530 of the selected slave unit 500, 600.

In step S31, the controller 530 of the selected slave unit 500, 600 receives the control signal including the turn data. In step S32, the controller 530 selects the units 510 and 520 ( antennas 515, 525, 615 and 625) based on the turning data. The selection data of the units 510, 520 ( antennas 515, 525, 615, 625) are made on the basis of the selection data on the basis of the direction in which the beam should be directed when the pivoting body pivots. In step S33, the controller 530 controls the selectors 504 and 505 such that signal exchange is performed in the selected units 510 and 520.

In step S34, the controller 530 adjusts the directivity of the beam formed by the antennas 515, 525, 615, 625 of the selected unit 510, 520 based on the turn data.

By controlling the beam directivity based on the turning data, it is possible to quickly follow the turning of the turning body 14 and maintain good communication.

FIG. 8 shows a variation of the arrangement of the slaves. FIG. 8 shows a relatively small construction machine 10. This construction machine 10 is also a hydraulic shovel. In the construction machine 10, the movable portion 16 is disposed substantially at the center in the left-right direction X of the front portion of the revolving unit 14 disposed on the traveling unit 13. A driver's seat 15 is disposed at the rear of the revolving unit 14. Also in this construction machine 10, as in FIG. 1, the first handset 500 is disposed on the front right side of the swing body 14, and the second handset 600 is disposed on the rear left side of the swing body. It is also good. Instead of the second handset 600 on the rear left side, a second handset 900 may be disposed on the front left side.

As shown in FIG. 8, it is preferable that the first slave unit 500 and the second slave unit 600 be disposed substantially point-symmetrically with respect to the pivot axis C1 of the pivoting body 14. In addition, the first child device 500 and the second child device 900 may be disposed substantially line-symmetrically with respect to the longitudinal centerline C2 passing through the position of the pivot axis C1 of the revolving unit 14. As illustrated, the first handset 500 and the second handsets 600 and 900 may be disposed on the left and right sides of the revolving unit 14 with the movable portion 16 interposed therebetween. By these arrangements, the obstruction of communication by the movable portion 16 can be suppressed.

8 and 9 show another embodiment of the mobile station 200. FIG. In the above-described mobile station 200, the first antennas 515 and 525 are of the transmission / reception separation type in which the reception antennas 517 and 527 and the transmission antennas 519 and 529 are separated, and the second antennas 615 and 625 are of transmission / reception separation type as well. . On the other hand, in FIGS. 8 and 9, the first antennas 515 and 525 are integrated with transmission and reception, and the second antennas 615 and 625 are also integrated with transmission and reception. Descriptions of configurations of the mobile station 200 shown in FIGS. 8 and 9 that are similar to those of the mobile station 200 described above with reference to FIG. 3 and the like will be omitted.

The first antenna 515 included in the first unit 510 is an array antenna (first array antenna). The array antenna as the first antenna 515 includes a first antenna element 515a, a second antenna element 515b, a third antenna element 515c, and a fourth antenna element 515d. Each of the antenna elements 515a to 515d is a shared antenna element of horizontal polarization and vertical polarization.

In the first unit 510, the horizontally polarized RF signal for transmission, which is divided into four by the combination distributor 511a, is transmitted to four antenna elements 515a, 515b, 515c, 515d via four transceivers 513a, 513b, 513c, 513d. Given. The vertically polarized RF signals for transmission, which are divided into four by the combination distributor 511b, are supplied to four antenna elements 515a, 515b, 515c, 515d via the four transceivers 513a, 513b, 513c, 513d.

The horizontally polarized RF signals received by the four antenna elements 515a, 515b, 515c, 515d are supplied to the combining / distributing device 511a via the four transceivers 513a, 513b, 513c, 513d and combined. The vertically polarized RF signals received by the four antenna elements 515a, 515b, 515c, 515d are provided to the combining / distributing device 511b via the four transceivers 513a, 513b, 513c, 513d and combined.

As shown in FIG. 10, the transmission system 550 and the reception system 560 of the transceivers 513a, 513b, 513c, 513d are switched in time division by the switch 540a and the switch 540b. The switch 540 a and the switch 540 b are controlled by the controller 530.

Also in the embodiment shown in FIGS. 8 and 9, the second unit 520 has the same configuration as the first unit 510. The first antenna 525 included in the second unit 520 is also similar to the first antenna 515 included in the first unit 510. That is, the first antenna 525 is an array antenna. The array antenna as the first antenna 525 includes a first antenna element 525a, a second antenna element 525b, a third antenna element 525c, and a fourth antenna element 525d. Each of the antenna elements 525a to 525d is a shared antenna element of horizontal polarization and vertical polarization.

In the second unit 520, the horizontally polarized RF signal for transmission divided by four by the combining / distributing device 521a is transmitted to four antenna elements 525a, 525b, 525c, 525d via four transceivers 523a, 523b, 523c, 523d. Given. The vertically polarized RF signals for transmission divided into four by the combining / distributing device 521b are applied to four antenna elements 525a, 525b, 525c, 525d via four transceivers 523a, 523b, 523c, 523d.

The horizontally polarized RF signals received by the four antenna elements 525a, 525b, 525c, 525d are applied to the combining / distributing device 521a via the four transceivers 523a, 523b, 523c, 523d and combined. The vertically polarized RF signals received by the four antenna elements 525a, 525b, 525c, and 525d are provided to the combining and distributing device 521b via the four transceivers 523a, 523b, 523c, and 523d, and combined.

The configurations of the transceivers 523a, 523b, 523c, and 523d of the second unit 520 are also as shown in FIG.

The second selector 504 selects which of the plurality of array antennas 515 and 525 to apply the RF signal of horizontal polarization for transmission. This selection is also a selection of which of the plurality of array antennas 515 and 525 down-converts and transmits the RF signal received to the master unit 400.

The second selector 505 selects which of the plurality of array antennas 515 and 525 to apply a vertically polarized RF signal for transmission to. This selection is also a selection of which of the plurality of array antennas 515 and 525 down-converts and transmits the RF signal received to the master unit 400.

When the second selectors 504 and 505 select the array antenna 515 of the first unit 510 as an array antenna for transmitting and receiving RF signals, the second selectors 504 and 505 are RF signals of horizontal polarization and vertical polarization. To the first unit 510. The RF signal provided to the first unit 510 is transmitted by the first array antenna 515. Also, the RF signal received by the first unit 510 is down-converted to an IF signal and transmitted to the parent device 400.

If the second selectors 505 and 505 select the array antenna 525 of the second unit as an array antenna for transmitting and receiving RF signals, the second selectors 504 and 505 generate RF signals of horizontal polarization and vertical polarization. The second unit 520 is provided. The RF signal provided to the second unit 520 is transmitted by the first array antenna 525. Also, the RF signal received by the second unit 520 is down-converted to an IF signal and transmitted to the parent device 400.

Second handset 600 has the same configuration as first handset 500. Here, while the antennas 515 and 525 included in the first handset 500 are referred to as first antennas 515 and 525, the antennas 615 and 625 included in the second handset 600 are referred to as second antennas 615, 625. Call it As described above, the antennas 515, 525, 615, 625 are array antennas, respectively, and can adjust beam directivity.

[3. Appendix]
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown by the scope of the claims, not the meaning described above, and is intended to include the meanings equivalent to the scope of the claims and all modifications within the scope.

10 equipment (construction machinery)
11 Device Body 13 Traveling Body 14 Rotating Body 15 Driver Seat 16 Movable Part (Working Machine)
Reference Signs List 17 boom 18 arm 19 bucket 30 camera 40 remote control system 100 base station 200 mobile station 201 mobile station main body 300 remote antenna system 360 horizontal plane 400 master polarization terminal 402 horizontal polarization terminal 402 vertical polarization terminal 403 control terminal 404 frequency converter 405 frequency Converter 406 First selector 407 First selector 408 Controller 409 Superposition separation unit 500 First slave unit 501 First frequency converter 502 Second frequency converter 503 Superposition separation unit 504 Second selector 505 Second selector 510 First unit 511a combining distributor 511b combining distributor 513a transceiver 513b transceiver 513c transceiver 513d transceiver 515 first antenna (array antenna)
515a first antenna element 515b second antenna element 515c third antenna element 515d fourth antenna element 517 first array antenna (first receiving array antenna)
517a first reception antenna element 517b second reception antenna element 517c third reception antenna element 517d fourth reception antenna element 519 first array antenna (first transmission array antenna)
519a first transmitting antenna element 519b second transmitting antenna element 519c third transmitting antenna element 519d fourth transmitting antenna element 520 second unit 521a combining distributor 521b combining distributor 523a transceiver 523b transceiver 523c transceiver 523d transceiver 525 first antenna (array antenna)
525a first antenna element 525b second antenna element 525c third antenna element 525d fourth antenna element 527 first array antenna (first receiving array antenna)
527a first receive antenna element 527b second receive antenna element 527c third receive antenna element 527d fourth receive antenna element 529 first array antenna (first transmit array antenna)
529a first transmission antenna element 529b second transmission antenna element 529c third transmission antenna element 529d fourth transmission antenna element 530 controller 540, 540a, 540b switch 550 transmission system 551 amplifier (power amplifier)
553 Amplitude adjuster 555 Phase shifter 560 Receiver 556 Amplifier (low noise amplifier) 560 Receiver 563 Amplitude adjuster 565 Phase shifter 600 Second slave 615 Second antenna (array antenna)
625 Second antenna (array antenna)
700 1st transmission line 800 2nd transmission line 900 2nd child machine

Claims (15)

1. A mobile station mounted on a device comprising a movable device body and a movable part provided in the device body,
   A first antenna disposed in the device body;
   A second antenna disposed at a position different from the first antenna in the apparatus main body, the second antenna forming a beam directed to a range which may be shielded by the movable portion as viewed from the first antenna; ,
   Mobile station with
2. A master unit connected to a mobile station body which outputs a radio frequency signal;
   A first handset comprising the first antenna;
   A first transmission path connecting the master unit and the first slave unit;
   A second handset including the second antenna;
   A second transmission path connecting the master unit and the second slave unit;
   The mobile station according to claim 1, comprising
3. The base unit converts the radio frequency signal received from the mobile station body into an intermediate frequency signal, and outputs the intermediate frequency signal to the first transmission path or the second transmission path.
   The first slave unit converts the intermediate frequency signal received from the master unit via the first transmission path into a radio frequency signal, and forms a beam of the radio frequency signal by the first antenna.
   The second slave unit converts the intermediate frequency signal received from the master unit via the second transmission path into a radio frequency signal, and forms a beam of the radio frequency signal by the second antenna. Mobile station as described in.
4. The first child device converts a radio frequency signal received by the first antenna into an intermediate frequency, and outputs the intermediate frequency signal to the first transmission path.
   The second handset converts a radio frequency signal received by the second antenna into an intermediate frequency, and outputs the intermediate frequency signal to the second transmission path.
   The master unit converts the intermediate frequency signal received from the first handset or the second handset via the first transmission path or the second transport path into a radio frequency signal, and the radio frequency signal The mobile station according to claim 2 or 3, which outputs to the mobile station body.
5. The mobile station according to any one of claims 2 to 4, wherein each of the first slave unit and the second slave unit includes an amplifier for amplifying the radio frequency signal.
6. The mobile station according to any one of claims 2 to 5, wherein the master unit comprises a first selector for selecting a slave unit to which a signal output from the master unit is given.
7. The at least one antenna of the first antenna and the second antenna includes a plurality of array antennas each capable of forming a beam within a plurality of different angular ranges,
   A cordless handset provided with the plurality of array antennas among the first cordless handset and the second cordless handset further comprises a second selector for selecting which of the plurality of array antennas to apply the radio frequency signal to. The mobile station according to 6.
8. The mobile station according to claim 7, wherein the plurality of array antennas can change the directivity of a beam within a plurality of different angle ranges.
9. The device body includes a traveling body, and a revolving body that pivots on the traveling body.
   The mobile station according to claim 6, wherein the selection by the first selector is performed based on data indicating the turning of the turning body.
10. The device body includes a traveling body, and a revolving body that pivots on the traveling body.
    The mobile station according to claim 7, wherein the selection by the second selector is performed based on data indicating the turning of the turning body.
11. The device body includes a traveling body, and a revolving body that pivots on the traveling body.
    The mobile station according to claim 8, wherein the change in directivity of the beam is performed based on data indicating the turning of the turning body.
12. The mobile station according to any one of claims 1 to 11, wherein the first antenna and the second antenna are for millimeter waves or quasi-millimeter waves.
13. The mobile station according to any one of claims 1 to 12, which is used to transmit image data captured by a camera included in the device.
14. The device body includes a traveling body, and a revolving body that pivots on the traveling body.
    A plurality of antennas including the first antenna and the second antenna compensate each other for an angle range in which the beams can be formed so that the beam can be formed in any direction within a 360 ° range in the horizontal plane The mobile station according to any one of claims 1 to 13, wherein the mobile station is disposed in the revolving unit.
15. A remote antenna system mounted on a device comprising a movable device body and a movable part provided on the device body, the remote antenna system comprising:
    A master unit connected to a mobile station body which outputs a radio frequency signal;
    A first handset including a first antenna disposed in the device body;
    A first transmission path connecting the master unit and the first slave unit;
    A second antenna disposed at a position different from the first antenna in the apparatus main body, the second antenna forming a beam directed to an area which may be shielded by the movable portion as viewed from the first antenna; The second child machine to be equipped,
    A second transmission path connecting the master unit and the second slave unit;
    Remote antenna system comprising:

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