Patent ID: 12218400

Embodiments of the present invention is described in detail below with reference to the drawings.

FIRST EMBODIMENT

FIG.1is a side view of a moving body1on which an antenna device100according to a first embodiment is mounted. Antenna device100is mounted on moving body1such as an aircraft for satellite communication. Antenna device100is attached to, for example, an upper surface of the aircraft as illustrated inFIG.1. In the following description, antenna device100is mounted on an aircraft that is an example of moving body1. Antenna device100may be mounted on another type of moving body1. When being mounted on another type of moving body1, antenna device100is attached to a surface of moving body1such as an upper face or a side face of moving body1where antenna device100can transmit and receive radio waves to and from a satellite. Antenna device100includes mainly an array antenna2, a power supply3, a base4, a mount5, a radome6, and a skirt7. Array antenna2transmits and receives radio waves. Power supply3supplies power to array antenna2. Base4is a member that supports array antenna2and power supply3. Mount5is a member that fixes base4to moving body1. Radome6is a member that covers the top of mount5and protects array antenna2, power supply3, and base4. Skirt7is provided at a position outside mount5and between mount5and moving body1. The outer shape of the lower portion of antenna device100is determined by the outer shape of skirt7. Skirt7has an outer shape that reduces the air resistance. Skirt7is connected to the lower side of radome6without leaving any space therebetween, and is provided all around mount5. Skirt7makes antenna device100to have a shape that reduces air resistance in the lower portion of antenna device100, and dissipates heat generated in antenna device100.

FIG.2is a plan view of antenna device100in a state in which radome6is removed.FIG.3is a cross-sectional view of antenna device100according to the first embodiment.FIG.3is a cross-sectional view in a cross section perpendicular to the nose direction of moving body1on which antenna device100is mounted, and is a cross-sectional view taken along line A-A inFIG.2.

The outer shape of radome6and skirt7, that is, the outer shape of antenna device100is an elliptical frustum. In a plan view of antenna device100viewed from above, the contour of antenna device100is an ellipse long in the nose direction. In the cross section inFIG.3, the conical surface of the elliptical frustum is inclined at an angle such that the width of the top surface is about 70% of the width of the bottom surface. Antenna device100with the shape of the elliptical frustum has a smaller area as viewed in the nose direction than that with a shape of an elliptical cylinder. Antenna device100with the outer shape of the elliptical frustum has smaller air resistance than that with an outer shape of, for example, an elliptical cylinder or a quadrangular cylinder. The outer shape of radome6is the elliptical frustum, and thus, mount5and base4are also elliptical in a plan view. The shape of the ellipse of base4is determined such that the short diameter is as small as possible as long as it is greater than or equal to the width of array antenna2, and the long diameter is greater than or equal to a necessary length.

Array antenna2includes a reception array antenna21and a transmission array antenna22. Reception array antenna21and transmission array antenna22are plate-shaped active electronic scanning array antennas. Reception array antenna21and transmission array antenna22are arranged with an interval in the nose direction, and are arranged at the center in the direction perpendicular to the nose direction. Reception array antenna21is arranged closer to the nose with respect to transmission array antenna22. Reception array antenna21and transmission array antenna22are arranged in the nose direction, by which the width and area of antenna device100viewed in the nose direction are reduced. The width of antenna device100is the length of antenna device100in the direction perpendicular to the nose direction. Reception array antenna21and transmission array antenna22are rectangular in a plan view. Reception array antenna21and transmission array antenna22are arranged such that the longer sides of the rectangles are parallel to the nose direction.

Each of reception array antenna21and transmission array antenna22has an antenna board12. Antenna board12includes a plurality of element antennas10mounted on a surface (one surface) far from moving body1, and a radio frequency integrated circuit (RFIC)11mounted on a surface (the other surface) near moving body1. RFIC11is an integrated circuit that processes radio frequency signals to operate the plurality of element antennas10. Array antenna2can change the orientation direction of radio waves in any direction within a predetermined range by controlling the phase of element radio wave radiated by each of element antennas10. Array antenna2tracks a satellite to communicate with. Antenna device100can scan electronically and communicate with an artificial satellite so as to track the artificial satellite without scanning by a mechanical drive technique.

Power supply3includes a power supply component13that supplies power to RFIC11and a power supply board14on which power supply component13is mounted. Power supply3is disposed between base4and mount5. RFIC11included in array antenna2and power supply component13included in power supply3generate heat when antenna device100transmits and receives radio waves. RFIC11and power supply component13are components that generate a large amount of heat. RFIC11and power supply component13are mounted on different boards. Specifically, RFIC11is mounted on antenna board12, and power supply component13is mounted on power supply board14.

Base4is a member to which array antenna2and power supply3are attached. Base4has a plate-shaped member, and has antenna board12mounted on one surface of the plate-shaped member. Thus, the plate-shaped member supports antenna board12. Power supply board14is provided on a surface (the other surface) opposite to the one surface of the plate-shaped member of base4. Specifically, an upper surface (heat dissipation surface) of RFIC11mounted on antenna board12is connected to the one surface of base4which is a surface far from moving body1. Power supply component13mounted on power supply board14is connected to the other surface of base4. The other surface of base4is a surface near moving body1. RFIC11and power supply component13which are heat generating components are connected separately to two different surfaces of base4. Heat generated by RFIC11and heat generated by power supply component13can be transferred to base4through different paths, whereby heat can be transferred efficiently. RFIC11and power supply component13are components that generate a large amount of heat.

Base4includes the plate-shaped member being elliptical and a side face member having a cylindrical shape. Antenna board12and power supply board14are attached to the plate-shaped member. The side face member having the cylindrical shape connects the periphery of the plate-shaped member to mount5. Each of antenna board12and power supply board14is fixed to base4with a fixture (not illustrated). An upper end of the side face member having the cylindrical shape is closed by the plate-shaped member, and a lower end is opened. Base4has an elliptical cylindrical shape. The lower end of the side face member of base4is connected to mount5. Base4is supported by mount5. Base4is fixed to mount5. The plate-shaped member of base4may have any shape. The plate-shaped member having an elliptical shape fits to the internal space of radome6having a shape of elliptical frustum. Desirably, the shape of the plate-shaped member of base4is an elliptical shape. The plate-shaped member may have any shape such as a polygon or a circle as long as it can support antenna board12and power supply board14. The side face member of base4may have another shape as long as it connects the periphery of the plate-shaped member and mount5. For example, the side face member may be a plurality of members connecting the periphery of the plate-shaped member and mount5.

Heat generated by RFIC11and power supply component13is transferred to base4. Base4transfers heat transferred from RFIC11and power supply component13to mount5. Base4protects RFIC11, antenna board12, power supply component13, and power supply board14from a load applied to antenna device100mounted on moving body1externally because of vibration or the like. Base4is desirably made of a material having high thermal conductivity and high rigidity. Base4includes a first member41that transfers heat, and a second member42that supports antenna board13and power supply board14.

First member41is connected to RFIC11, power supply component13, and mount5. First member41is made of a material having high thermal conductivity. Being high in thermal conductivity means that the thermal conductivity of the material is greater than or equal to a predetermined value. The determined value is, for example, greater than or equal to 700 W/mK, desirably 1000 W/mK. First member41is made of a material having higher thermal conductivity than second member42. First member41is made of a material containing graphite. Second member42is made of a material having higher rigidity than first member41. Antenna board13and power supply board14are fixed to second member42. Second member42supports antenna board13and power supply board14such that no load is applied to first member41. Second member42is made of a material containing aluminum. Specifically, as illustrated inFIG.2, the plate-shaped member of base4is formed by first member41in a central portion in the thickness direction (thickness central portion), portions each connecting an area of the one surface to be in contact with RFIC11and the thickness central portion, and portions each connecting an area of the other surface to be in contact with power supply component13and the thickness central portion. The side face member of base4is formed by first member41in the thickness central portion. In the plate-shaped member and the side face member of base4, the thickness central portions formed by first member41are connected to each other. In the plate-shaped member and the side face member of base4, the surfaces of first member41is covered with second member42. First member41is exposed on the surface in the area of the one surface of the plate-shaped member of base4to be in contact with RFIC11and an area of the other surface to be in contact with power supply component13. First member41forming the thickness central portion of the side face member is exposed on the side face of the side face member to be in contact with mount5.

Graphite has a feature of having thermal conductivity about eight times higher than aluminum. In base4, first member41containing graphite having high thermal conductivity connects RFIC11and mount5, and connects power supply component13and mount5. Base4functions as a heat spreader and diffuses heat generated by RFIC11and power supply component13quickly throughout first member41. Base4can suppress an occurrence of temperature unevenness in RFIC11, antenna board12, power supply component13, and power supply board14. Base4can also transfer heat efficiently to a place distant from RFIC11, antenna board12, power supply component13, and power supply board14, which are heat sources, through first member41containing graphite having high thermal conductivity. Therefore, an increase in temperature of RFIC11, antenna board12, power supply component13, and power supply board14can be suppressed, and the temperatures thereof can be appropriate. It is possible to suppress deterioration in electrical performance caused by the increase in temperatures of RFIC11and antenna board12. The shortening of the life of power supply component13and power supply board14can be reduced. Graphite has a specific gravity of about 0.8 times that of aluminum. When being constructed by combining first member41made of a material containing graphite and the second member made of a material containing aluminum, base4is reduced in weight as compared with a case where entire of base4is made of aluminum.

On the other hand, graphite has a feature of having lower rigidity than aluminum. Therefore, entire of base4cannot be made of graphite. In a case where antenna device100is mounted on moving body1that generates large vibration during movement, the base formed of graphite entirely is likely to be damaged by the vibration. Base4has a structure in which first member41containing graphite is covered with second member42made of a material containing aluminum having higher rigidity than graphite. Compared with a base formed of graphite entirely, base4has a structure that is strong against an external load such as vibration applied from the outside. Base4can have high thermal conductivity and high rigidity because of the structure obtained by connecting first member41containing graphite and second member42containing aluminum.

FIG.4is an enlarged cross-sectional view of a connection portion between base4and RFIC11, a connection portion between base4and power supply component13, and a connection portion between base4and mount5in antenna device100according to the first embodiment. In order to transfer heat generated by RFIC11and power supply component13to base4with a small thermal resistance, it is preferable that RFIC11and base4are brought into close contact with each other, and that power supply component13and base4are connected in close contact to each other. Being in close contact at the connection point means that connection is made in such a way that no air or the like enters therebetween. The connection surface between RFIC11and base4and the connection surface between power supply component13and base4are processed so as to reduce surface irregularities. Base4and RFIC11are connected in close contact to each other with a thermal interface material9interposed therebetween, thermal interface material9being in contact with base4and RFIC11without leaving any space therebetween. Thermal interface material9is made of a material having thermal conductivity greater than or equal to a predetermined value. Base4and power supply component13are connected in close contact to each other with thermal interface material9interposed therebetween, thermal interface material9being in contact with base4and power supply component13without leaving any space therebetween. Thermal interface material9can fill small unevenness between RFIC11and base4and between power supply component13and base4. Thermal interface material9can reduce thermal resistance on the contact surface between RFIC11and base4and the contact surface between power supply component13and base4.

The type of thermal interface material9connecting base4and RFIC11and the type of thermal interface material9connecting base4and power supply component13may be the same or different from each other. The determined value (required thermal conductivity value) for the thermal conductivity of thermal interface material9connecting base4and RFIC11and the required thermal conductivity value of thermal interface material9connecting base4and power supply component13may be the same or different from each other. At least one of the required thermal conductivity and the type of thermal interface material9may be changed for each connection portion.

Mount5is disposed on a side of the surface (the other surface) of base4to which power supply component13is connected. Mount5is fixed to moving body1. Mount5supports base4, radome6, and skirt7. Mount5supports base4such that power supply board14faces the one surface of mount5. Mount5is fixed to moving body1on the side of the other surface which is a surface of mount5opposite to the one surface. Mount5is a member for attaching antenna device100to moving body1. Mount5is made of a metal material having high rigidity and has a cross-sectional shape for increasing rigidity so as not to transmit the influence of disturbance caused by a vibration load, a wind load, and the like to array antenna2. Base4is fixed to the upper surface of mount5with a fixture (not illustrated). The connection surface between base4and mount5is processed so as to reduce surface irregularities. Base4and mount5are in contact to each other without leaving any space between base4and the mount5, and are connected in close contact with thermal interface material9interposed therebetween.

Mount5is a member having a shape of a low hollow elliptical frustum. An upper surface of the elliptical frustum is closed by a plate-shaped member to which base4is fixed, and a lower surface is opened. Mount5is disposed such that the plate-shaped member has a predetermined distance from moving body1. Mount5is fixed to moving body1with a fastening hardware8. Base4is attached to a surface of mount5far from moving body1. Mount5includes the plate-shaped member which is elliptical and on which base4is mounted and a side face member. The side face member of mount5is a cylindrical member having an inclined side face. An upper end of the side face member of mount5is connected to a periphery of the plate-shaped member. The side face member of mount5has a cylindrical shape (shape of elliptical frustum) that increases in diameter from an end connected to the plate-shaped member toward a moving body1side end. The plate-shaped member of mount5may have any shape. The plate-shaped member of mount5may have any shape such as a polygon or a circle as long as base4can be mounted thereon. Because of the elliptical shape, the area of mount5in a plan view can be reduced, and radome6and skirt7can have a shape capable of reducing air resistance. Mount5has an elliptical shape in a plan view desirably. Even when the plate-shaped member of base4has a shape other than an ellipse in a plan view, the shape of the plate-shaped member of mount5is elliptical in a plan view desirably. The side face member of mount5may have a shape different from the cylindrical shape such as the elliptical frustum. Mount5may be a solid member having a shape of an elliptical frustum.

Radome6is attached above mount5. Radome6and mount5form a closed space above mount5. Array antenna2, power supply3, and base4are housed in the closed space. Radome6is provided to protect array antenna2, power supply3, and base4. Radome6is disposed so as to cover a side of mount5on which base4is provided. Radome6protects array antenna2, power supply3, and base4from external environments such as hot air, cold air, rain, and wind outside radome6. Radome6is made of a material having a high dielectric constant and a high dielectric loss tangent so as to transmit radio waves. Radome6is strong enough to protect array antenna2, power supply3, and base4from an external environment such as wind load and collision of foreign matters. Radome6has a necessary and sufficient thickness to withstand an assumed load.

Radome6has a shape of a hollow elliptical frustum with a closed upper end and an open lower end. Radome6includes a flat member that is an upper surface and a side face member connected to a lower side of the flat member. The side face member of radome6is a cylindrical member having an inclined side face. The diameter of the side face member of radome6increases from the closed upper end toward the open lower end. Radome6is provided on the outer surface of mount5. The side face member of radome6is connected to the side face member of mount5at an inclination angle same as the inclination angle of the side face member of mount5. At least one of the side face member of mount5and the side face member of radome6may vary in inclination angle depending on height.

Radome6is fixed to mount5by a fastening component15. A part of the upper side (the side on which base4is provided) of mount5is fitted into radome6. Radome6and mount5form the closed space in which array antenna2, power supply3, and base4are placed. The lower side (the side opposite to the side on which base4is provided) of mount5protrudes from radome6. The inner surface of radome6at the open end is fixed to the side face member that becomes the outer surface of mount5. The side face member of mount5has a face to which the inner surface of radome6is attached and a face formed outside radome6. Mount5may have a structure to be fitted into radome6entirely. In this case, the side face member of mount5is attached to the inner surface of radome6entirely. Fastening component15is attached from the outside of radome6toward mount5. Fastening component15fastens radome6and mount5, and is a bolt, a rivet, or the like. Fastening component15is provided with anti-loosing measures so as not to be loosened by a load or vibration during flight of moving body1. Since radome6is fixed to mount5in this manner, the detachment of radome6from mount5is prevented even when moving body1is subjected to loads caused by disturbance during movement.

FIG.5is an enlarged cross-sectional view of a connection portion between skirt7and mount5of antenna device100according to the first embodiment. Skirt7is a member provided between moving body1and radome6in order to reduce the air resistance of antenna device100. Skirt7is provided on the outer surface of mount5between radome6and moving body1. Skirt7dissipates heat transferred from mount5. Skirt7has a shape fitting to a shape of a portion of mount5to which skirt7is attached. Skirt7has a shape of a hollow elliptical frustum. Skirt7includes a side face having a shape similar to the shape of the side face member that is the outer surface of mount5, an end face connected to the open lower end of radome6, and an end face connected to the surface of moving body1. An inner surface of skirt7is connected to the outer surface of mount5. The upper end face (one end) of skirt7is connected to the open lower end of radome6. The lower end face (other end) of skirt7is connected to the surface of moving body1so as to fit to the curved surface on the surface of moving body1. Skirt7is provided so as to cover the surface of the side face member of mount5formed outside radome6. Skirt7is fixed to mount5by fastening component15. Fastening component15is attached from the outside of skirt toward mount5. Fastening component15is a bolt, a rivet, or the like. Since skirt7is fixed to mount5in this manner, the detachment of skirt7from mount5is prevented even when moving body1is subjected to loads caused by disturbance during movement.

Since radome6and skirt7have a shape of an elliptical conical surface with inclining side faces, air resistance can be reduced even when moving body1moves at a high speed, as compared with a structure having a side face that is not inclined. The shape of side faces of radome6and skirt7is made to be such that an increase in air resistance caused by mounting antenna device100is minimized. Antenna device100can reduce the increase in air resistance, and can suppress transmission of vibration caused by a vibration load, a wind load, or the like to array antenna2.

Skirt7is provided on a surface of the side face member of mount5formed outside radome6. Skirt7may have another structure as long as it is provided between radome6and moving body1. Mount5and skirt7are connected in close contact to each other via thermal interface material9described above. Mount5and skirt7are connected in close contact via thermal interface material9, which is in contact with mount5and skirt7without leaving any space therebetween and is made of a material having thermal conductivity greater than or equal to a predetermined value.

Skirt7is attached to moving body1via an elastic material16such as rubber. Elastic material16is a member for filling a small gap between skirt7and moving body1. Elastic material16allows that skirt7and moving body1are connected in close contact. Therefore, it is possible to prevent wind that antenna device100receives during the operation of the moving body from entering into antenna device100through between skirt7and moving body1, and to prevent antenna device100from being subjected to lift caused by the wind entering into antenna device100. It also prevents water or the like from entering into antenna device100through between skirt7and moving body1.

As illustrated inFIG.5, the outer surface of skirt7and the outer peripheral surface of the radome6are disposed so that there are no level difference between them. With this structure, no level difference is formed on the outer surface of antenna device100, whereby the air resistance can be reduced. As illustrated inFIG.6, the outer surface of skirt7may be located slightly inside the outer surface of radome6. This structure can also reduce the air resistance similarly, because the step on the outer surface is small. Skirt7is made of, for example, metal having high thermal conductivity such as aluminum. Skirt7may have a radiating fin on the outer surface in order to increase an area of skirt7in contact with cool air outside moving body1. For example, a plurality of slits may be formed in the outer surface of skirt7as radiating fins.

FIG.7is a diagram illustrating a flow of heat in antenna device100. Arrows inFIG.7indicate the direction of flow of heat. Heat generated by RFIC11and power supply component13is transferred to base4through different paths. The heat transferred to base4is diffused throughout base4mainly through first member41of base4and transferred to mount5. The heat transferred from base4to mount5is diffused throughout mount5and transferred to skirt7. The heat transferred to skirt7is released to the outside of radome6. Skirt7serves as a heat dissipation portion for releasing heat generated by RFIC11and power supply component13to the outside of radome6.

In antenna device100, RFIC11and power supply component13, which generate a large amount of heat, are mounted separately on antenna board12and power supply board14which are different from each other. Antenna board12and power supply board14are connected to base4having high thermal conductivity. In antenna device100, heat generated by RFIC11and power supply component13can be transferred to mount5via base4efficiently. Heat is transferred from mount5to skirt7, and skirt7dissipates heat to the outside air. Heat generated by RFIC11and power supply component13can be dissipated to the outside of radome6efficiently without providing a cooling device such as a fan inside radome6. When antenna device100is mounted on an aircraft, radome6is necessary. RFIC11and power supply component13are sealed inside radome6and are not exposed to the outside air directly. It is difficult to dissipate heat to moving body1from RFIC11and power supply component13due to restrictions of outfitting. In such a case, antenna device100can also dissipate heat generated by RFIC11and power supply component13efficiently to the outside through base4, mount5, and skirt7. Antenna device100provides higher heat dissipation performance than before. Since antenna device100does not include components only for cooling, the height of antenna device100does not increase. Base4has a structure obtained by combining first member41containing graphite and second member42containing aluminum. With this configuration, base4has high thermal conductivity and high rigidity. Since heat is transferred from base4to skirt7and dissipated by skirt7, wind blowing to moving body1during operation can be used for cooling antenna device100. In a case where moving body1is an aircraft, the temperature of air outside moving body1is lower as the altitude at which moving body1flies is higher, whereby the cooling efficiency is improved.

SECOND EMBODIMENT

FIG.8is a cross-sectional view of an antenna device200according to a second embodiment in a cross section perpendicular to the nose direction. The cross section is the same in position as that inFIG.3, and is taken along line A-A inFIG.2. Antenna device200differs from antenna device100according to the first embodiment in the structure of mount5. The other configurations are substantially the same. Hereinafter, the same reference numerals are given to the same or corresponding components as those described in the above-described embodiment, and the descriptions thereof is not repeated.

In antenna device200according to the second embodiment, mount5is disposed with a space from the surface of moving body1. A component17that generates heat is disposed in contact with a surface of mount5near moving body1. Component17may be any of a component constituting antenna device200, a component of a device related to antenna device200, and a component of a device not related to antenna device200. A plurality of components17may be disposed. Heat generated by component17is transferred to mount5. The surface of mount5near moving body1and component17are disposed in contact with each other so that heat can be transferred efficiently. Although not illustrated, mount5and component17may be connected via thermal interface material9, which is in contact with mount5and component17without leaving any space therebetween and is made of a material having thermal conductivity greater than or equal to a predetermined value. Mount5transfers heat transferred from component17to skirt7.

Mount5is made of a material containing graphite to increase thermal conductivity. As illustrated inFIG.8, mount5, like base4, has a structure obtained by combining a third member51containing graphite and a fourth member52containing aluminum. Mount5includes third member51that transfers heat, and fourth member52that supports base4, radome6, and skirt7. Third member51is in contact with first member41of base4, component17, and skirt7. Third member51is made of a material having high thermal conductivity. The thermal conductivity of third member51is higher than the thermal conductivity of fourth member52. Third member51is made of a material containing graphite. Fourth member52supports base4, radome6, and skirt7, and is made of a material having higher rigidity than third member51. Each of base4, radome6, and skirt7is fixed to fourth member52of mount5so that no load is applied to third member51. Fourth member52is made of a material containing aluminum.

Specifically, as illustrated inFIG.8, the plate-shaped member of mount5is formed by third member51in a thickness central portion, portions each connecting the thickness central portion and an area of the one surface to be in contact with base4, and portions each connecting the thickness central portion and an area of the other surface to be in contact with component17. In the side face member of mount5, a portion (thickness outer portion) having a predetermined thickness in an area of the outer surface to be in contact with skirt7is formed by third member51. The thickness central portion of the plate-shaped member of mount5and the thickness outer portion of the side face member are in contact with each other. In the plate-shaped member and the side face member of mount5, the surfaces of third member51is covered with fourth member52. Third member51is exposed on the surface in the area of the one surface of the plate-shaped member of mount5to be in contact with base4and the area of the other surface to be in contact with component17. In the area of the outer surface of the side face member to be in contact with skirt7, third member51is exposed on the surface.

FIG.9is a diagram illustrating a flow of heat in antenna device200. Arrows inFIG.9indicate the direction of flow of heat. Heat generated by RFIC11and power supply component13is transferred to base4through different paths. The heat transferred to base4is diffused throughout base4mainly through first member41of base4and transferred to mount5. Heat generated by component17is transferred to mount5. The heat transferred to mount5is diffused throughout mount5mainly through third member51of mount5, and transferred to skirt7outside radome6. The heat transferred to skirt7is released to the outside air. Skirt7serves as a heat dissipation portion for releasing heat generated by RFIC11, power supply component13, and component17to the outside of radome6.

Antenna device200has the same configuration as antenna device100regarding RFIC11, power supply component13, and base4, and also has the same flow of heat as that of antenna device100. In antenna device200, third member51of mount5is also connected to component17. Mount5has a structure including third member51made of a material having high thermal conductivity and fourth member52made of a material having higher rigidity than third member51. Mount5transfers heat transferred from base4to skirt7, and dissipates the heat to the outside air by skirt7.

Component17that generates a large amount of heat is disposed on the surface (the other surface) of mount5near moving body1. A heat generating device instead of a heat generating component may be disposed on the other surface of mount5. It is only sufficient that a heat generating element that is a component or a device generating heat is connected to the other surface of mount5. Heat is transferred from the heat generating element to mount5, and the heat transferred to mount5is transferred to skirt7. Skirt7also dissipates heat generated by the heat generating element to the outside air. A space between mount5and moving body1can be used effectively by disposing component17in the space. Mount5has a structure having high thermal conductivity, whereby heat generated by component17can be transferred to skirt7efficiently.

Even when not connected to the heat generating element, mount5may have a structure including third member51made of a material having high thermal conductivity and fourth member52made of a material having higher rigidity than third member51. In this case, third member51is in contact with base4and skirt7. Specifically, in the plate-shaped member of mount5, a thickness central portion and portions each connecting the thickness central portion and an area to be in contact with base4are formed by third member51. In the side face member of mount5, a thickness central portion and portions each connecting the thickness central portion and an area to be in contact with skirt7are formed by third member51. In the plate-shaped member and the side face member of mount5, the thickness central portions formed by third member51are connected to each other. In the plate-shaped member and the side face member of mount5, the surfaces of third member51is covered with fourth member52.

It is possible to combine freely the above embodiments, modify the above embodiments, omit some components, or combine freely embodiments which have been modified or in which some components have been omitted.

REFERENCE SIGNS LIST

1: moving body,2: array antenna,21: reception array antenna,22: transmission array antenna,3: power supply,4: base,5: mount,6: radome,7: skirt,8: fastening hardware,9: thermal interface material,10: element antenna,11: RFIC (integrated circuit),12: antenna board,13: power supply component,14: power supply board,15: fastening component,16: elastic material,17: component,100,200: antenna device