JP2013219652A - Antenna housing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna housing device which removes water droplets adhering thereto during rainfall and snowfall.SOLUTION: An antenna housing device 100 includes: a housing body 10; and a rotating body 20. The housing body 10 includes: a housing 11 that houses a millimeter wave radio device 12 having an antenna 12a and is formed by a synthetic resin enabling electric waves to penetrate therethrough; a temperature sensor 13 detecting an ambient temperature of a surrounding area; a water droplet sensor 14 detecting water droplets etc; a motor control device 30 that has a meteorological condition determination part 31 and a motor driving part 32 and drives a motor 15 when the meteorological condition is determined to be rainfall and the like; and the motor 15 rotating the rotation body 20. The rotation body 20 includes: a circular plane part 20a arranged perpendicular to a radio wave direction; a cylindrical part 20b joined to the plane part 20a; and a power conduction member 20c formed on an inner surface of the cylindrical part 20b.

Description

  The present invention relates to an antenna housing apparatus that houses an antenna used for, for example, millimeter wave band wireless communication.

  Conventionally, a radome is attached to an antenna for wireless communication to protect the antenna from wind and rain. Moreover, not only an antenna but the antenna and radio | wireless machine are also protected by the housing accommodated including the radio | wireless machine connected to the antenna.

  The outer surface of the radome or housing gets wet with water droplets during rain. And it has been pointed out that the formation of the water droplets and the water film on the outer surface of the radome caused by the water droplets causes the attenuation of the radio wave, and the attenuation increases as the frequency increases (for example, see Non-Patent Document 1). Therefore, various countermeasures have been studied (for example, see Patent Documents 1 to 4).

  In Patent Document 1, a mechanism for collecting rain so as to surround the upper part of the radome and a mechanism for draining the collected water are provided so as to collect the rain falling on the radome and not wet the radome surface. It has been proposed to drain. Patent Documents 2 and 3 propose that a groove is provided on the outer surface of the radome to provide a mechanism for draining rain so as not to cause long vertical rain streaks. Patent Document 4 proposes a satellite broadcasting antenna device that rotates the entire hemispherical radome and shakes off water droplets adhering to the radome surface.

JP-A-9-186521 Japanese Patent Laid-Open No. 2004-23645 JP 2005-203978 A Japanese Utility Model Publication No. 64-30907

Manabu Kondo, et al. "Radiation characteristics of a reflector antenna with a radome at 10 to 30 GHz during rain", IEICE Transactions B, Vol. J69-B, no. 3, published on March 20, 1986, pp. 265-273

  However, the technique described in Patent Document 1 is intended for rainfall that pours from the zenith, and is not an effective technique for rain that pours from an oblique direction or a lateral direction. In addition, the technique described in Patent Document 1 has a problem that water droplets remain in the trough (water collecting structure) provided for draining for a long time.

  The techniques described in Patent Documents 2 and 3 are effective for the attenuation of radio waves due to long vertical rain streaks, but there are problems such as water droplets remaining for a long time in an oblique groove provided for draining. there were.

  Further, in the techniques described in Patent Documents 1 to 3, since water droplets attached to the outer surface of the antenna radome are increased to some extent and do not have means for removing the water droplets until they naturally flow, they can solve the attenuation caused by the water droplets. It wasn't.

  The technique described in Patent Document 4 has a problem in that since the radome has a hemispherical shape, water droplets do not fly well and remain in the radome.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an antenna housing apparatus that can remove water droplets attached during rain or snow.

  An antenna housing apparatus according to the present invention includes a housing that houses an antenna that wirelessly communicates with a wireless communication device that performs transmission or reception of radio waves, and a direction in which the radio waves are emitted, provided on the wireless communication device side of the housing Alternatively, a plane plate that intersects the arrival direction, a rain / snow detection unit that detects rain or snow, and a water droplet removal that removes water droplets from the plane plate on the condition that the rain / snow detection unit has detected the rain or snowfall. And means.

  With this configuration, the antenna housing device of the present invention removes water droplets from the flat plate when the rain / snow detecting means detects rain or snow by the water drop removing means. Can be removed.

  In the antenna accommodating device of the present invention, the water droplet removing means includes a motor for rotating the flat plate and a motor driving means for driving the motor.

  With this configuration, the antenna housing apparatus of the present invention removes water droplets by centrifugal force generated by the motor rotating the flat plate, so that it is possible to remove water droplets adhering during rainfall or snowfall.

  The antenna housing apparatus of the present invention has a configuration in which the water droplet removing means includes an ultrasonic vibrator that vibrates the flat plate, and an ultrasonic vibrator driving means that drives the ultrasonic vibrator. Yes.

  With this configuration, the antenna housing apparatus of the present invention drops and atomizes water droplets attached during rain or snowfall by the ultrasonic vibrator vibrating the flat plate, so it adheres during rain or snowfall. Water droplets can be removed.

  The antenna accommodation apparatus of the present invention further includes reception power information acquisition means for acquiring information of reception power of a signal received by the antenna, and the water droplet removal means is configured such that the reception power is lower than a predetermined reception power threshold. It has a configuration that removes the water droplets from the flat plate on condition that it is low.

  With this configuration, the antenna accommodating device of the present invention can remove water droplets attached during raining or snowing by driving the water droplet removing means based on the received power of the signal received by the antenna.

  The present invention can provide an antenna housing apparatus having an effect of removing water droplets attached during rain or snow.

It is a cross-sectional schematic diagram in 1st Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a block block diagram in 1st Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a flowchart which shows the operation | movement in 1st Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a cross-sectional schematic diagram in 2nd Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a block block diagram in 2nd Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a flowchart which shows the operation | movement in 2nd Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a block block diagram in 3rd Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a flowchart which shows the operation | movement in 3rd Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a block block diagram in 4th Embodiment of the antenna accommodating apparatus which concerns on this invention. It is a flowchart which shows the operation | movement in 4th Embodiment of the antenna accommodating apparatus which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the antenna housing apparatus of the present invention will be described with reference to an example in which the antenna housing apparatus is applied to a radio with an antenna that uses millimeter-wave radio waves.

(First embodiment)
First, the structure in 1st Embodiment of the antenna accommodating apparatus which concerns on this invention is demonstrated.

  FIG. 1 is a schematic cross-sectional view of an antenna accommodating device 100 in the present embodiment. As shown in FIG. 1, the antenna housing device 100 includes a housing 10 and a rotating body 20.

  The container 10 includes a housing 11, a millimeter wave radio 12, a temperature sensor 13, a raindrop sensor 14, a motor control device 30, and a motor 15.

  The housing 11 is formed of, for example, a synthetic resin that can transmit radio waves, and its external appearance is centered on the emission direction or arrival direction (hereinafter simply referred to as “radio wave direction”) of radio waves to a wireless communication device (not shown). It has a cylindrical shape. Moreover, the housing | casing 11 has the side surface 11a which cross | intersects a radio wave direction, and the outer peripheral surface 11b in which the temperature sensor 13 and the raindrop sensor 14 were provided.

  The millimeter wave radio 12 includes an antenna 12a and communicates with a wireless communication device using millimeter wave radio waves. The millimeter wave radio 12 may use radio waves in a quasi-millimeter wave band (frequency 10 GHz to 30 GHz).

  The temperature sensor 13 detects the temperature around the antenna housing device 100 and outputs temperature information indicating the detected temperature to the motor control device 30. This temperature sensor 13 constitutes the rain / snow detection means according to the present invention.

  The raindrop sensor 14 detects raindrops or snow particles (hereinafter simply referred to as “raindrops”) and outputs information such as raindrops indicating that the raindrops have been detected to the motor control device 30. The raindrop sensor 14 constitutes a rain / snow detection unit according to the present invention.

  The motor control device 30 has the configuration shown in the functional block diagram of FIG. That is, the motor control device 30 includes a weather condition determination unit 31 and a motor drive unit 32, and is configured by a microcomputer, for example. The motor control device 30 constitutes a water droplet removing unit according to the present invention.

  The weather condition determination unit 31 determines the weather condition based on temperature information from the temperature sensor 13 and information such as raindrops from the raindrop sensor 14. Specifically, the weather condition determination unit 31 determines that it is raining when the temperature information from the temperature sensor 13 indicates, for example, 3 ° C. or higher when information such as raindrops is input from the raindrop sensor 14. When the temperature information from 13 indicates, for example, less than 3 ° C., it is determined that it is snowing. This determination signal is transmitted to the motor drive unit 32.

  In addition, the weather condition determination unit 31 measures the elapsed time from the time when it is determined that the weather condition is not rain or the like (rainfall has stopped) after determining the weather condition as rain or snow (hereinafter referred to as “rainfall”). Have a timer to do.

  The motor driving unit 32 drives the motor 15 by outputting a motor driving signal to the motor 15 when the weather condition determining unit 31 determines that the weather condition is raining or the like.

  The motor 15 includes a main body 15a, a rotating shaft 15b, and a gear 15c, and rotates the rotating body 20 based on a motor driving signal output from the motor driving unit 32. The motor 15 constitutes a water droplet removing unit according to the present invention.

  The rotating body 20 is formed of, for example, a synthetic resin that can transmit radio waves, and is provided so as to cover the side surface 11 a of the housing 11. The rotating body 20 includes a circular flat surface portion 20a that intersects the radio wave direction, a cylindrical portion 20b joined to the flat surface portion 20a, and a power transmission member 20c formed on the inner surface of the cylindrical portion 20b. Yes. The plane portion 20a constitutes a plane plate according to the present invention. The power transmission member 20c is configured with a gear, a belt, or the like. A rolling bearing 16 is interposed between the cylindrical portion 20 b and the outer peripheral surface 11 b of the container 10. With this configuration, the rotating body 20 is rotated about the direction of the radio wave as the rotation center by the rotation of the motor 15.

  In FIG. 1, the configuration example in which the planar portion 20a of the rotating body 20 is orthogonal to the radio wave direction is shown, but the present invention is not limited to this, and the planar portion 20a of the rotating body 20 is The structure may be inclined at a predetermined angle.

  Next, operation | movement of the antenna accommodating apparatus 100 in this embodiment is demonstrated using FIG. 3, referring FIG.1 and FIG.2 suitably.

  The weather condition determination unit 31 determines whether it is raining or the like based on the temperature information from the temperature sensor 13 and the raindrop information from the raindrop sensor 14 (step S11).

  In step S11, if it is not determined as rain or the like, step S11 is repeated. If it is determined as rain or the like, the weather condition determination unit 31 outputs a control signal for causing the motor drive unit 32 to drive the motor 15. .

  The motor drive unit 32 outputs a motor drive signal to the motor 15, and the motor 15 rotates the rotating body 20 (step S12). As a result, raindrops and the like adhering to the rotating body 20 are removed from the rotating body 20 by the centrifugal force of the rotating body 20.

  The weather condition determination unit 31 determines whether it is raining or the like based on the temperature information from the temperature sensor 13 and the raindrop information from the raindrop sensor 14 (step S13).

  In step S13, if it is determined that it is raining or the like, the process returns to step S12. If it is not determined that it is raining or the like, the weather condition determination unit 31 starts measuring time (step S14).

  The weather condition determination unit 31 determines whether or not a predetermined time (for example, 30 minutes) has elapsed since the start of time measurement (step S15).

  In step S15, if the weather condition determination unit 31 does not determine that the predetermined time has elapsed, it is determined whether or not it is raining based on the temperature information from the temperature sensor 13 and the raindrop information from the raindrop sensor 14. Determination is made (step S16).

  In step S16, if it is not determined that it is raining or the like, the process returns to step S15. If it is determined that it is raining or the like, the weather condition determination unit 31 ends the time measurement (step S17) and returns to step S12.

  On the other hand, if it is determined in step S15 that the predetermined time has elapsed, the weather condition determination unit 31 outputs a signal indicating that the output of the motor drive signal is stopped to the motor drive unit 32.

  The motor drive unit 32 stops outputting the motor drive signal to the motor 15, and the motor 15 stops the rotation of the rotating body 20 (step S18).

  As described above, the antenna housing apparatus 100 according to the present embodiment is configured to rotate the rotating body 20 by driving the motor 15 when the weather condition determination unit 31 determines that it is raining or the like. It is possible to remove water droplets adhering during rain or snow.

  In the above-described embodiment, the configuration example in which the antenna accommodating device 100 accommodates the millimeter wave radio 12 having the antenna 12a has been described, but the present invention is not limited to this. For example, the main body of the millimeter-wave radio 12 and the antenna 12a are separated and the main body of the millimeter-wave radio 12 is installed outside the antenna accommodating device 100, and the antenna accommodating device 100 accommodates only the antenna 12a. The effect is obtained.

(Second Embodiment)
First, the structure in 2nd Embodiment of the antenna accommodating apparatus which concerns on this invention is demonstrated.

  As shown in FIG. 4, the antenna housing apparatus 200 in the present embodiment is obtained by changing a part of the antenna housing apparatus 100 (see FIG. 1) in the first embodiment, and includes a housing body 40 and a vibrating body 50. ing. In addition, the same code | symbol is attached | subjected to the structure similar to the antenna accommodating apparatus 100, and the description is abbreviate | omitted.

  The container 40 includes a housing 11, a millimeter wave radio 12, a temperature sensor 13, a raindrop sensor 14, a vibrator control device 60, and an ultrasonic vibrator 41. In addition, although the external appearance shape of the housing | casing 11 is made into the column shape illustrated in 1st Embodiment, other shapes (for example, rectangular parallelepiped) may be sufficient.

  The vibrator control device 60 has the configuration shown in the functional block diagram of FIG. That is, the vibrator control device 60 includes a weather condition determination unit 31 and a vibrator driving unit 61, and is configured by a microcomputer, for example. The vibrator control device 60 constitutes a water droplet removing unit according to the present invention.

  The vibrator driving unit 61 drives the ultrasonic vibrator 41 by outputting a vibrator driving signal to the ultrasonic vibrator 41 when the weather situation judging unit 31 judges that the weather situation is raining or the like. Yes.

  The ultrasonic vibrator 41 includes a main body 41a having a piezoelectric element and a vibration shaft 41b, and vibrates the vibrating body 50 based on a vibrator driving signal output from the vibrator driving unit 61. The ultrasonic transducer 41 constitutes a water droplet removing unit according to the present invention.

  The vibrating body 50 is formed of a synthetic resin that can transmit radio waves, and is provided so as to cover the side surface 11a. The vibrating body 50 includes a circular or rectangular plane part 50a that intersects the radio wave direction, and a cylindrical part 50b joined to the plane part 50a. The flat portion 50a is joined to the vibration shaft 41b and constitutes a flat plate according to the present invention. Between the cylindrical part 50b and the outer peripheral surface 11b of the container 10, for example, a rubber packing 17 is interposed. With this configuration, the vibrating body 50 is vibrated by the ultrasonic vibration of the ultrasonic transducer 41.

  FIG. 4 shows a configuration example in which the planar portion 50a of the vibrating body 50 is orthogonal to the radio wave direction, but the present invention is not limited to this, and the planar portion 50a of the vibrating body 50 is in the radio wave direction. The structure may be inclined at a predetermined angle.

  Next, the operation of the antenna accommodation apparatus 200 in the present embodiment will be described with reference to FIG. 6 while referring to FIGS. 4 and 5 as appropriate. In addition, the same code | symbol is attached | subjected to the step similar to the operation | movement step (refer FIG. 3) of the antenna accommodating apparatus 100, and the description is abbreviate | omitted.

  If it is determined in step S11 that it is raining or the like, the weather condition determination unit 31 outputs a control signal for causing the ultrasonic transducer 41 to drive the transducer driving unit 61 to the ultrasonic transducer 41.

  The vibrator driving unit 61 outputs a vibrator driving signal to the ultrasonic vibrator 41, and the ultrasonic vibrator 41 vibrates the vibrating body 50 (step S21). As a result, raindrops and the like attached to the vibrating body 50 are dropped and atomized and removed from the vibrating body 50.

  If it is determined in step S15 that the predetermined time has elapsed, the weather condition determination unit 31 outputs a signal indicating that the output of the transducer drive signal is stopped to the transducer drive unit 61.

  The transducer drive unit 61 stops outputting the transducer drive signal to the ultrasonic transducer 41, and the ultrasonic transducer 41 stops the vibration of the vibrating body 50 (step S22).

  As described above, in the antenna accommodating device 200 according to this embodiment, when the weather condition determination unit 31 determines that it is raining or the like, the vibrator driving unit 61 drives the ultrasonic vibrator 41 to vibrate the vibrating body 50. Since it was set as the structure, the water droplet adhering at the time of raining or snowing can be removed.

(Third embodiment)
First, the structure in 3rd Embodiment of the antenna accommodating apparatus which concerns on this invention is demonstrated.

  As shown in FIG. 7, the antenna housing apparatus 300 in the present embodiment is obtained by changing a part of the antenna housing apparatus 100 (see FIG. 2) in the first embodiment, and thus has the same configuration as the antenna housing apparatus 100. Are denoted by the same reference numerals, and description thereof is omitted. Moreover, since the cross-sectional schematic diagram of the antenna accommodating apparatus 300 is the same as that of FIG.

  The antenna housing device 300 includes a motor control device 70. The motor control device 70 includes a received power acquisition unit 71, a received power storage unit 72, a weather condition determination unit 73, and a motor drive unit 74, and is configured by a microcomputer, for example. This motor control device 70 constitutes a water droplet removing means according to the present invention.

  The reception power acquisition unit 71 acquires reception power information indicating reception power from the reception device 12 b included in the millimeter wave radio 12. The reception power acquisition unit 71 constitutes reception power information acquisition means according to the present invention.

  The reception power storage unit 72 stores data of a predetermined reception power threshold. This reception power threshold is a value obtained by conducting experiments and simulations in advance.

  The weather condition determination unit 73 determines the weather condition based on temperature information from the temperature sensor 13 and information such as raindrops from the raindrop sensor 14. This determination signal is output to the motor drive unit 74.

  The weather condition determination unit 73 compares the received power acquired by the received power acquisition unit 71 from the reception device 12b with the received power threshold data read from the received power storage unit 72. And the weather condition determination part 73 outputs the signal which shows that to the motor drive part 74, when the reception power of the receiver 12b is lower than a reception power threshold value.

  The motor driving unit 74 drives the motor 15 by outputting a motor driving signal to the motor 15 when the weather condition determining unit 73 determines that the weather condition is raining or the like. Further, the motor drive unit 74 outputs a motor drive signal to the motor 15 to drive the motor 15 when the weather condition determination unit 73 determines that the reception power of the reception device 12b is lower than the reception power threshold. It has become.

  Next, the operation of the antenna housing apparatus 300 in the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the step similar to the operation | movement step (refer FIG. 3) of the antenna accommodating apparatus 100, and the description is abbreviate | omitted.

  If it is determined in step S15 that the predetermined time has elapsed, the weather condition determination unit 73 compares the reception power of the reception device 12b with the reception power threshold Pth (step S31), and the reception power of the reception device 12b is the reception power. If it is less than the threshold value Pth, step S31 is repeated. That is, in this case, the rotation of the rotating body 20 is not stopped even after a predetermined time has elapsed.

  On the other hand, in step S31, when the reception power of the reception device 12b is equal to or greater than the reception power threshold Pth, the weather condition determination unit 73 outputs a signal indicating that the motor drive signal is stopped to the motor drive unit 74.

  The motor drive unit 74 stops outputting the motor drive signal to the motor 15, and the motor 15 stops the rotation of the rotating body 20 (step S18).

  As described above, the antenna accommodating device 300 in the present embodiment is configured to extend the rotation time of the rotating body 20 based on the received power of the receiving device 12b. Even if water droplets due to fog adhere to the rotating body 20, it can be removed.

(Fourth embodiment)
First, the structure in 4th Embodiment of the antenna accommodating apparatus which concerns on this invention is demonstrated.

  As shown in FIG. 9, the antenna housing apparatus 400 in the present embodiment is obtained by changing a part of the antenna housing apparatus 200 (see FIG. 5) in the second embodiment, and thus has the same configuration as the antenna housing apparatus 200. Are denoted by the same reference numerals, and description thereof is omitted. Further, a schematic cross-sectional view of the antenna accommodating device 400 is the same as FIG. In addition, the same components as those of the antenna housing device 300 (see FIG. 7) in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The antenna housing device 400 includes a vibrator control device 80. The transducer control device 80 includes a received power acquisition unit 71, a received power storage unit 72, a weather condition determination unit 73, and a transducer drive unit 81, and is configured by a microcomputer, for example. The vibrator control device 80 constitutes a water droplet removing unit according to the present invention.

  The transducer drive unit 81 outputs a transducer drive signal to the ultrasonic transducer 41 and drives the ultrasonic transducer 41 when the weather situation determination unit 31 determines that the weather situation is raining or the like. Yes. The transducer driving unit 81 outputs a transducer driving signal to the ultrasonic transducer 41 when the weather condition determination unit 73 determines that the received power of the receiving device 12b is lower than the received power threshold, The vibrator 41 is driven.

  Next, the operation of the antenna housing apparatus 400 in the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the step similar to the operation | movement step (refer FIG. 6) of the antenna accommodating apparatus 200, and the description is abbreviate | omitted.

  If it is determined in step S15 that the predetermined time has elapsed, the weather condition determination unit 73 compares the reception power of the reception device 12b with the reception power threshold Pth (step S41), and the reception power of the reception device 12b is the reception power. If it is less than the threshold value Pth, step S41 is repeated. That is, in this case, the vibration of the vibrating body 50 is not stopped even after a predetermined time has elapsed.

  On the other hand, in step S41, when the reception power of the reception device 12b is equal to or greater than the reception power threshold Pth, the weather condition determination unit 73 outputs a signal indicating that the output of the transducer drive signal is stopped to the transducer drive unit 81.

  The transducer drive unit 81 stops outputting the transducer drive signal to the ultrasonic transducer 41, and the ultrasonic transducer 41 stops the vibration of the vibrating body 50 (step S22).

  As described above, the antenna accommodating device 400 according to the present embodiment is configured to extend the vibration time of the vibrating body 50 based on the received power of the receiving device 12b. Therefore, for example, fog is generated after the rain or the like stops, Even if water droplets due to fog adhere to the vibrating body 50, it can be removed.

  As described above, the antenna housing apparatus according to the present invention has an effect of removing water droplets attached during rain or snow, and accommodates an antenna used for millimeter wave band wireless communication. Useful as a containment device.

DESCRIPTION OF SYMBOLS 10, 40 Container 11 Housing | casing 11a Side surface 11b Outer peripheral surface 12 Millimeter wave radio | wireless machine 12a Antenna 12b Receiver 13 Temperature sensor (rain and snow detection means)
14 Raindrop sensor (Rainfall and snow detection means)
15 Motor (droplet removal means)
16 Rolling bearing 17 Packing 20 Rotating body 20a, 50a Plane portion (planar plate)
20b, 50b Tubular part 20c Power transmission member 30, 70 Motor control device (water droplet removing means)
31, 73 Weather condition determination unit 32, 74 Motor drive unit 41 Ultrasonic vibrator (water droplet removing means)
41a main body 41b vibration shaft 50 vibration body 60, 80 vibrator control device (water droplet removing means)
61, 81 Vibrator driving unit 71 Received power acquisition unit (Received power information acquisition means)
72 Received power storage unit 100, 200, 300, 400 Antenna accommodation device

Claims (4)

A housing for housing an antenna that performs wireless communication with a wireless communication device that transmits or receives radio waves;
A flat plate that is provided on the wireless communication device side of the container and intersects the emission direction or the arrival direction of the radio wave;
Rain / snow detection means for detecting rain or snow;
Water droplet removing means for removing water droplets from the flat plate on the condition that the rain / snow detecting means has detected the rain or the snow;
An antenna accommodating device comprising: The water droplet removing means is
A motor for rotating the flat plate;
Motor driving means for driving the motor;
The antenna accommodating device according to claim 1, further comprising: The water droplet removing means is
An ultrasonic vibrator for vibrating the flat plate;
An ultrasonic vibrator driving means for driving the ultrasonic vibrator;
The antenna accommodating device according to claim 1, further comprising: Further comprising reception power information acquisition means for acquiring information of reception power of the signal received by the antenna;
The water droplet removing means removes the water droplet from the flat plate on condition that the received power is lower than a predetermined received power threshold value. The antenna accommodation apparatus of any one of Claims.

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