Horn antenna alignment jig and horn antenna alignment method

Abstract

To provide a horn antenna alignment tool and a method for aligning a horn antenna, which can clarify the center position of the horn antenna and can easily install the horn antenna.SOLUTION: A horn antenna alignment tool includes a horn antenna fixing unit fixed to a horn antenna 2, a center indicating unit connected to the horn antenna fixing unit, arranged so as to overlap with a center position 2b at the end of the opening side of the horn antenna 2, and indicating a center corresponding position 313a overlapping with the center position 2b, and a laser irradiation device 5 connected to at least one of the horn antenna fixing unit and the center indicating unit, and emitting a laser in a direction along an axis 2a of the horn antenna 2, and the center indicating unit includes a first hole unit 315 (first plumb bob mounting unit) provided at the center corresponding position 313a and capable of mounting a plumb bob 6.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a horn antenna positioning jig and a horn antenna positioning method. [Background Art]

[0002] In simulations of electromagnetic wave propagation in buildings, permittivity is used as a parameter. As a method for measuring permittivity, there is the free-space method. In the free-space method, one of two antennas transmits electromagnetic waves toward a target building material, and the reflected electromagnetic waves are received by the other antenna (see, for example, Patent Document 1). When transmitting and receiving millimeter-wave electromagnetic waves, a horn antenna having a horn shape of a truncated pyramid with an open bottom surface is used. A horn antenna has high radio field intensity at its center (on the axis). For this reason, it is necessary to install the horn antenna such that a predetermined point (target) for reflecting electromagnetic waves on the measurement object is positioned ahead of the axis of the horn antenna. [Prior Art Documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2004-101300 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] However, a horn antenna has a hollow structure, and it is impossible to clarify the center thereof by marking or the like. For this reason, when installing a horn antenna, the center of the horn antenna is identified visually. In addition, when a plumb bob is used when installing a horn antenna, the plumb bob is attached at a position vertically below or above the visually identified center of the horn antenna. Therefore, there is a concern that errors may occur in the position of the horn antenna's center, affecting the measurement, and the installation of the horn antenna is complicated because the center of the horn antenna must be identified visually.

[0005] Therefore, the present invention aims to provide a horn antenna alignment jig and a horn antenna alignment method that can clearly define the center position of the horn antenna and allow for easy installation of the horn antenna. [Means for solving the problem]

[0006] To achieve the above objective, the horn antenna alignment jig according to the present invention comprises: a horn antenna fixing part fixed to the horn antenna; a center marking part connected to the horn antenna fixing part and positioned to coincide with the center position at the opening end of the horn antenna, with the center corresponding position that coincides with the center position clearly indicated; and a laser irradiation device connected to at least one of the first fixing part and the center marking part, which irradiates a laser in a direction along the axis of the horn antenna, wherein the center marking part has a first plumb bob mounting part provided at the center corresponding position to which a plumb bob can be attached.

[0007] To achieve the above objective, the horn antenna alignment method according to the present invention is a horn antenna alignment method using the horn antenna alignment jig described above, wherein the horn antenna alignment jig is fixed to the horn antenna, the horn antenna is installed on the installation surface so that the lower end of the plumb bob attached to the first plumb bob mounting part is aligned with a position that is vertically below the center position of the horn antenna on the installation surface, and the orientation of the horn antenna is adjusted by irradiating it with a laser using the laser irradiation device so that the laser reaches the point where the electromagnetic waves transmitted from the horn antenna are reflected.

[0008] In this invention, the center position of the horn antenna can be clearly defined by attaching a horn antenna alignment jig to the horn antenna. The lower end of the plumb bob attached to the first plumb bob mounting part is positioned vertically below the center position of the horn antenna, thereby clearly defining the center position of the horn antenna in a plan view. By irradiating the horn antenna with a laser beam from its center along its axis and adjusting its position, the orientation of the horn antenna can be adjusted to the optimal orientation for transmitting and receiving electromagnetic waves. In this way, the center position of the horn antenna can be clearly defined, and its position and orientation can be easily adjusted, making it easy to install the horn antenna.

[0009] The horn antenna alignment jig according to the present invention has an outer peripheral fixing portion fixed to the outer circumference of the horn antenna and located below the horn antenna when the horn antenna is in a position where the opening faces diagonally upward, and the outer peripheral fixing portion has a second plumb bob mounting portion provided at a position vertically below the center position to which a plumb bob can be attached, and the second plumb bob mounting portion may be provided at multiple positions corresponding to each of the multiple inclination angles of the horn antenna on the outer peripheral fixing portion.

[0010] The horn antenna alignment jig according to the present invention is a method for aligning a horn antenna using the horn antenna alignment jig described above, wherein the horn antenna alignment jig is fixed to the horn antenna, the horn antenna is positioned so that the opening faces diagonally upward, the horn antenna is installed on the installation surface such that the lower end of the plumb bob attached to the second plumb bob mounting part corresponding to the inclination angle of the horn antenna is aligned with a position that is vertically below the center position of the horn antenna on the installation surface, and the orientation of the horn antenna is adjusted by irradiating it with a laser using the laser irradiation device so that the laser reaches the point where the electromagnetic waves transmitted from the horn antenna are reflected.

[0011] With this configuration, even when the horn antenna is installed facing diagonally upward, the center position of the horn antenna in a plan view can be clearly determined by attaching a plumb bob to the second plumb bob mounting section at a position corresponding to the tilt angle of the horn antenna.

[0012] In the horn antenna alignment jig according to the present invention, the outer peripheral fixing portion may be detachable from the horn antenna fixing portion.

[0013] This configuration allows the horn antenna alignment jig to be switched between, as needed, a configuration in which an outer peripheral fixing part and a second plumb bob mounting part are provided, and a configuration in which the second plumb bob mounting part is not provided. [Effects of the Invention]

[0014] According to the present invention, the central position of the horn antenna can be clearly defined, and the horn antenna can be easily installed. [Brief explanation of the drawing]

[0015] [Figure 1] This diagram shows how to align a horn antenna that transmits and receives electromagnetic waves on a wall. [Figure 2] This is a perspective view of a horn antenna. [Figure 3] This diagram shows how to position a horn antenna that transmits and receives electromagnetic waves on the floor. [Figure 4] This diagram shows how to position a horn antenna that transmits and receives electromagnetic waves on the ceiling. [Figure 5] This is a perspective view of a horn antenna alignment jig. [Figure 6] This is a perspective view of a horn antenna with a horn antenna alignment jig attached. [Figure 7] This is a perspective view from below of a horn antenna with an alignment jig attached. [Modes for carrying out the invention]

[0016] Hereinafter, a horn antenna alignment jig and a horn antenna alignment method according to embodiments of the present invention will be described with reference to FIGS. 1 to 7. As shown in FIG. 1, the horn antenna alignment jig 1 according to the present embodiment is used by being attached to a horn antenna 2. In the present embodiment, the horn antenna alignment jig 1 is used for alignment when installing the horn antenna 2 that transmits electromagnetic waves toward predetermined points (targets 11a, 12a, 13a) such as a building wall surface 11, floor surface 12, and ceiling surface 13 (see FIG. 4), and another horn antenna 2 that receives electromagnetic waves reflected by the targets.

[0017] As shown in FIG. 2, the horn antenna 2 includes a horn portion 21 and a waveguide portion 22. The horn portion 21 is in the shape of a truncated quadrangular pyramid, and the bottom of the truncated quadrangular pyramid is open. The horn portion 21 is hollow. The waveguide portion 22 has a rectangular shape and is connected to the top of the horn portion 21. The bottom side of the truncated quadrangular pyramid in the horn portion 21 relative to the top portion is referred to as the opening side. The axis of the truncated quadrangular pyramid of the horn portion 21 is referred to as the axis 2a of the horn antenna 2. The central position at the end on the opening side of the horn portion 21 (the central position of the bottom of the above-mentioned truncated quadrangular pyramid) is referred to as the opening-side central position 2b of the horn antenna 2.

[0018] The horn portion 21 has four flat plate portions forming the truncated quadrangular pyramid. The four plate portions are a first horn plate portion 211, a second horn plate portion 212, a third horn plate portion 213, and a fourth horn plate portion 214, which are arranged around the axis 2a in this order, and adjacent plate portions are connected to each other. The first horn plate portion 211 and the third horn plate portion 213 have the same shape. The second horn plate portion 212 and the fourth horn plate portion 214 have the same shape. A ridge 215 is provided inside the horn portion 21 of the present embodiment. The horn antenna 2 is made of, for example, aluminum, or a material obtained by laminating copper on aluminum and coating with glass fiber reinforced epoxy resin.

[0019] As shown in Figure 1, the horn antenna 2 is mounted on a support base 23, such as a tripod, which is installed on the floor surface 12 (installation surface). The horn antenna 2 is installed so that the target 11a is located at the end of the axis 2a, because the radio wave intensity is high along the axis 2a. As shown in Figures 3 and 4, when the horn antenna 2 is installed in a direction that opens to sides other than the lower and upper sides in the vertical direction, the first horn plate portion 211 is installed so as to be positioned below the third horn plate portion 213.

[0020] As shown in Figure 5, the horn antenna alignment jig 1 includes a horn antenna mounting section 3, an outer peripheral fixing section 4, and a laser irradiation device 5. As shown in Figures 6 and 7, the horn antenna mounting portion 3 is provided inside the horn antenna 2 and is fixed to the horn antenna 2 with a clip 7 or the like. As shown in Figure 7, the outer peripheral fixing portion 4 is provided along the outer peripheral surface of the horn antenna 2 and is fixed to the horn antenna 2 with a clip (not shown) or the like. The laser irradiation device 5 is attached to the horn antenna mounting portion 3. In this embodiment, the outer peripheral fixing portion 4 is detachable from the horn antenna mounting portion 3. In Figure 6, the horn antenna alignment jig 1 has the outer peripheral fixing portion 4 removed. In Figure 7, the horn antenna alignment jig 1 has the outer peripheral fixing portion 4 attached.

[0021] As shown in Figures 5 and 6, the horn antenna mounting section 3 has a truncated pyramidal main body section 31 and a laser irradiation device mounting section 32 connected to the main body section 31, on which the laser irradiation device 5 is installed. The main body 31 is shaped like a truncated square pyramid, with an opening at the base of the truncated square pyramid. The main body 31 is hollow.

[0022] The main body 31 has four flat plate sections that form a truncated square pyramid. The four plate sections are the first main body plate section 311, the second main body plate section 312, the third main body plate section 313, and the fourth main body plate section 314, and are arranged in this order around the circumference of the truncated square pyramid, with adjacent plate sections connected to each other. In the main body 31 as well, the bottom side relative to the top of the truncated square pyramid is referred to as the opening side. The main body 31 is manufactured, for example, by bonding transparent acrylic resin plates together with adhesive. As shown in Figure 6, the first main body plate portion 311 has approximately the same shape as the first horn plate portion 211. The second main body plate portion 312 has approximately the same shape as the half of the second horn plate portion 212 that is on the side of the first horn plate portion 211. The fourth main body plate portion 314 has approximately the same shape as the half of the fourth horn plate portion 214 that is on the side of the first horn plate portion 211. The second main body plate portion 312 and the fourth main body plate portion 314 have the same shape.

[0023] The main body portion 31 is mounted inside the horn antenna 2 such that the first main body plate portion 311 overlaps the inside of the first horn plate portion 211, the second main body plate portion 312 overlaps the inside of the second horn plate portion 212 on the side of the first horn plate portion 211, the fourth main body plate portion 314 overlaps the inside of the fourth horn plate portion 214 on the side of the first horn plate portion 211, and the third main body plate portion 313 is positioned in the middle of the horn portion 21. At least one of the first main body plate portion 311, the second main body plate portion 312, and the third main body plate portion 313 is fixed to the horn antenna 2 with a clip or the like.

[0024] When the main body portion 31 is installed inside the horn antenna 2, the third main body plate portion 313 is positioned to coincide with the axis 2a of the horn antenna 2. The position at the opening end of the third main body plate portion 313 that coincides with the axis 2a of the horn antenna 2 is denoted as the center corresponding position 313a. The center corresponding position 313a of the third main body plate portion 313 coincides with the center position 2b on the opening side of the horn antenna 2. The center corresponding position 313a of the third main body plate portion 313 is positioned in the center in the direction connecting the second main body plate portion 312 and the fourth main body plate portion 314. The first main plate portion 311, the second main plate portion 312, and the fourth main plate portion 314 correspond to the "horn antenna fixing portion" in the claims. The third main plate portion 313 corresponds to the "center marking portion" in the claims.

[0025] A first hole 315 is formed at the center corresponding position 313a of the third main body plate portion 313, from which a plumb bob 6 can be suspended. The first hole 315 corresponds to the "first plumb bob mounting portion" in the claims.

[0026] The laser irradiation device mounting section 32 is formed in a rectangular tube shape and is connected to the opening side of the third main body plate section 313. The laser irradiation device mounting section 32 is manufactured, for example, by bonding transparent acrylic resin plates together with adhesive. The laser irradiation device 5 is installed inside the laser irradiation device mounting section 32. A hole 321 is formed in the laser irradiation device mounting section 32 at a position that overlaps with the switch of the laser irradiation device 5, and a screw 322 is inserted into it. The laser irradiation device 5 can be switched ON / OFF by tightening or loosening the screw 322. The laser irradiation device 5 installed in the laser irradiation device mounting section 32 irradiates a laser in a direction along the axis 2a of the horn antenna 2.

[0027] As shown in Figure 5, the outer peripheral fixing portion 4 is flat. The surface of the outer peripheral fixing portion 4 is substantially the same shape as the surface of the first main body plate portion 311. The outer peripheral fixing portion 4 is connected to the opening-side edge of the first main body plate portion 311 via a hinge 41. The outer peripheral fixing portion 4 is detachable from the first main body plate portion 311.

[0028] As shown in Figure 7, even when the main body portion 31 is positioned inside the horn antenna 2, the outer peripheral fixing portion 4 is not positioned inside the horn antenna 2, but rather overlaps the lower side of the first horn plate portion 211 and is fixed to the first horn plate portion 211 together with the first main body plate portion 311 using clips (not shown) or the like. At this time, the first horn plate portion 211 is sandwiched between the outer peripheral fixing portion 4 and the first main body plate portion 311. As shown in Figures 5 and 7, the outer peripheral fixing portion 4 has a plurality of second holes 42 from which a plumb bob 6 can be suspended. The plurality of second holes 42 correspond to the "second plumb bob mounting portion" in the claims.

[0029] Multiple second holes 42 are arranged at intervals in the direction connecting the side of the outer peripheral fixing portion 4 that is connected to the first main body plate portion 311 and the side that is separated from the first main body plate portion 311. As shown in Figure 4, when the horn antenna 2 is installed so that it opens diagonally upward, the first hole 315 is positioned above the first main body plate portion 311 or the horn antenna 2. Therefore, even if a plumb bob 6 is attached to the first hole 315, the plumb bob 6 will interfere with the first main body plate portion 311 and the horn antenna 2.

[0030] The second hole 42 is formed in the outer peripheral fixing part 4 at a position vertically below the first hole 315, that is, the center position 2b on the opening side of the horn antenna 2. The second hole 42 is formed vertically below the first hole 315 when the inclination angle of the horn antenna 2 with respect to the vertical is 15°, 22.5°, 30°, 37.5°, 45°, 52.5°, and 60°. Although not shown in the figure, the outer peripheral fixing part 4 has markings indicating the inclination angles corresponding to the circumference of each of the multiple second holes 42. The pitch of the inclination angles of the horn antenna 2 with respect to the vertical and the number of second holes 42 when forming the second holes 42 may be set as appropriate. When the horn antenna 2 is installed with an opening that faces diagonally upward, the plumb bob 6 can be positioned vertically below the center position 2b on the opening side of the horn antenna 2 by installing the plumb bob 6 in the second hole 421 corresponding to the angle of inclination among the multiple second holes 42.

[0031] Next, a method for aligning a horn antenna using the horn antenna alignment jig according to this embodiment will be described. As shown in Figure 1, when transmitting and receiving electromagnetic waves from the horn antenna 2 to the wall surface 11, the horn antenna 2 is installed so that the direction in which its axis 2a extends is horizontal. The direction in which the axis 2a of the horn antenna 2 extends is not perpendicular to the wall surface 11, but intersects the wall surface 11 at an oblique angle. When the horn antenna 2 is installed in the correct position, a marker 12b is placed at a position vertically below the center position 2b of the opening side of the horn antenna 2 on the floor surface 12.

[0032] The outer peripheral fixing part 4 is detached from the main body part 31. The horn antenna 2 is fixed to the support base 23 so that its axis 2a is horizontal. The horn antenna alignment jig 1 is installed inside the horn antenna 2. The plumb bob 6 is attached to the first hole part 315. The horn antenna alignment jig 1 may be installed on the horn antenna 2 before fixing the horn antenna 2 to the support base 23. The support base 23 is installed so that the lower end 6a of the plumb bob 6 is positioned on the mark 12b, which is located vertically below the center position 2b on the opening side of the horn antenna 2. The height of the first hole 315, i.e., the height of the center position 2b on the opening side of the horn antenna 2, is adjusted to match the height of the target 11a on the wall surface 11. The laser irradiation device 5 is driven, and the horizontal orientation of the horn antenna 2 is adjusted so that the laser is irradiated onto the target 11a on the wall surface 11. The distance between the lower end 6a of the plumb bob 6 and the wall surface 11 corresponds to the horizontal distance between the center position 2b on the opening side of the horn antenna 2 and the target 11a. By doing so, the horn antenna 2 is positioned in the correct orientation.

[0033] As shown in Figure 3, when transmitting and receiving electromagnetic waves from the horn antenna 2 to the floor surface 12, the horn antenna 2 is installed so that the direction in which the axis 2a of the horn antenna 2 extends intersects with the horizontal and vertical directions. The horn antenna 2 has an opening that is diagonally downward. When the horn antenna 2 is installed in the correct position, a marker 12b is placed at a position that is vertically below the center position 2b of the opening side of the horn antenna 2 on the floor surface 12.

[0034] The outer peripheral fixing part 4 is detached from the main body part 31. The horn antenna 2 is fixed to the support base 23 at a predetermined angle that results in the above-described position. In this embodiment, the support base 23 is provided with a scale plate 24 on which a scale capable of measuring the mounting angle of the horn antenna 2 is displayed. By aligning the mark 251 provided on the L-shaped fitting 25 attached to the horn antenna 2 with the predetermined angle mark on the scale plate 24, the horn antenna 2 can be fixed to the support base 23 at the predetermined angle. A horn antenna alignment jig 1 is installed inside the horn antenna 2. A plumb bob 6 is installed in the first hole 315.

[0035] The support base 23 is installed so that the lower end 6a of the plumb bob 6 is positioned on the mark 12b, which is located vertically below the center position 2b on the opening side of the horn antenna 2. The laser irradiation device 5 is driven, and the horizontal orientation of the horn antenna 2 is adjusted so that the laser is irradiated onto the target 12a on the floor surface 12. The distance between the lower end 6a of the plumb bob 6 and the target 12a corresponds to the horizontal distance between the center position 2b on the opening side of the horn antenna 2 and the target 12a. By doing so, the horn antenna 2 is positioned in the correct orientation.

[0036] As shown in Figure 4, when transmitting and receiving electromagnetic waves from the horn antenna 2 to the ceiling surface 13, the horn antenna 2 is installed so that the direction in which its axis 2a extends intersects with the horizontal and vertical directions. The horn antenna 2 has an opening that is diagonally upward. Here, the horn antenna 2 is installed with its axis 2a tilted at 30° with respect to the vertical direction. When the horn antenna 2 is installed in the correct position, a marker 12b is placed at a position that is vertically below the center position 2b of the opening side of the horn antenna 2 on the floor surface 12.

[0037] The outer peripheral fixing part 4 is attached to the main body part 31. The horn antenna 2 is fixed to the support base 23 in a position tilted 30° with respect to the vertical. The angle of the horn antenna 2 is adjusted in the same manner as when transmitting and receiving electromagnetic waves from the horn antenna 2 to the floor surface 12 as described above. A positioning jig 1 for the horn antenna 2 is installed inside the horn antenna 2. A plumb bob 6 is installed in the second hole 42 corresponding to the tilt angle of 30°. The support base 23 is installed so that the lower end 6a of the plumb bob 6 is positioned on the mark 12b, which is located vertically below the center position 2b on the opening side of the horn antenna 2. The laser irradiation device 5 is driven, and the horizontal orientation of the horn antenna 2 is adjusted so that the laser is irradiated onto the target 13a on the ceiling surface 13. By doing so, the horn antenna 2 is positioned in the correct orientation.

[0038] Next, the operation and effects of the horn antenna alignment jig and horn antenna alignment method according to this embodiment will be described. The horn antenna alignment jig 1 according to this embodiment can be attached to the horn antenna 2 to clearly indicate the center position of the horn antenna. The lower end 6a of the plumb bob 6 attached to the first hole 315 (first plumb bob mounting part) is positioned vertically below the center position 2b on the opening side of the horn antenna 2, thereby clearly indicating the center position 2b on the opening side of the horn antenna 2 in a plan view. By irradiating a laser from the center position 2b on the aperture side of the horn antenna 2 in a direction along the axis 2a of the horn antenna 2 and adjusting its position, the orientation of the horn antenna 2 can be adjusted to the optimal orientation for transmitting and receiving electromagnetic waves. In this way, the center position 2b on the opening side of the horn antenna 2 can be clearly defined, and its position and orientation can be easily adjusted, making it easy to install the horn antenna 2.

[0039] Furthermore, the horn antenna alignment jig 1 according to this embodiment has an outer peripheral fixing part 4 that is fixed to the outer circumference of the horn antenna 2 and is located below the horn antenna 2 when the horn antenna 2 is in an upward-slanting position. The outer peripheral fixing part 4 is provided at a position vertically below the center position and has a second hole 42 (second plumb bob mounting part) to which a plumb bob 6 can be attached. The second hole 42 is provided at multiple positions corresponding to each of the multiple inclination angles of the horn antenna 2 on the outer peripheral fixing part. With this configuration, even when the horn antenna 2 is installed facing diagonally upward, the plumb bob 6 can be attached to the second hole 42 at a position corresponding to the tilt angle of the horn antenna 2, thereby clearly defining the center position 2b on the opening side of the horn antenna 2 in a plan view.

[0040] Furthermore, in the horn antenna alignment jig 1 according to this embodiment, the outer peripheral fixing portion 4 is detachable from the first main body plate portion 311 (horn antenna fixing portion) of the horn antenna mounting portion 3. This configuration allows the horn antenna alignment jig 1 to be switched between a configuration in which the outer peripheral fixing portion 4 is provided and the second hole portion 42 is provided, and a configuration in which the second hole portion 42 is not provided, as needed.

[0041] The embodiments of the horn antenna alignment jig and horn antenna alignment method according to the present invention have been described above, but the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the invention. For example, in the above embodiment, the horn antenna alignment jig 1 is provided with an outer peripheral fixing portion 4 in which a second hole portion 42 is formed, but it is not necessary to provide the outer peripheral fixing portion 4. Furthermore, in the above embodiment, the outer peripheral fixing portion 4 is detachable from the first main body plate portion 311 of the horn antenna mounting portion 3, but it may also be fixed in a way that prevents its removal.

[0042] In the above embodiment, the first main plate portion 311, the second main plate portion 312, and the fourth main plate portion 314 correspond to the "horn antenna fixing portion" in the claims, and the third main plate portion 313 corresponds to the "center indicator portion" in the claims. The horn antenna fixing portion may have a shape other than that described above, as long as it can be stably fixed to the horn antenna 2. Also, the center indicator portion may have a shape other than that described above, as long as it can indicate the center position 2b on the opening side of the horn antenna 2. In the above embodiment, the first main body plate portion 311, the second main body plate portion 312, and the fourth main body plate portion 314, which correspond to the horn antenna fixing portion, are fixed to the horn antenna 2 with clips, but they may be fixed with fasteners other than clips.

[0043] Among the 17 international goals adopted at the UN Summit in September 2015 are the "Sustainable Development Goals (SDGs)." The horn antenna alignment jig and horn antenna alignment method according to this embodiment can contribute to achieving goals such as "Goal 9: Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation," among the 17 Sustainable Development Goals (SDGs). [Explanation of Symbols]

[0044] 1. Horn antenna alignment jig 2 horn antennas 2a axis 2b Center position 4 Outer periphery fixing part 5. Laser irradiation device 6. Plumb bob 6a bottom edge 11a, 12a, 13a Target (point) 12 Floor surface (installation surface) 31 Main body 32 Laser irradiation device installation section 41 hinges 42 Second hole (second plumb bob mounting section) 311 First main plate section (horn antenna fixing section) 312 Second main plate section (horn antenna fixing section) 313 3rd body plate part (center clearly visible part) 313a Center Corresponding Position 314. Fourth main plate section (horn antenna fixing section) 315 First hole (first plumb bob mounting section)

Claims

1. A horn antenna mounting part that is fixed to the horn antenna, A center marking portion is connected to the horn antenna fixing portion, is positioned to coincide with the center position at the opening end of the horn antenna, and clearly indicates the center corresponding position that coincides with the center position. The system includes a laser irradiation device connected to at least one of the horn antenna fixing portion and the center marking portion, which irradiates a laser in a direction along the axis of the horn antenna, The center marking section is a horn antenna alignment jig having a first plumb bob mounting section provided at the center corresponding position and capable of attaching a plumb bob.

2. The outer peripheral fixing portion is fixed to the outer circumference of the horn antenna and is located below the horn antenna when the horn antenna is in a position where the opening faces diagonally upward. The outer peripheral fixing portion has a second plumb bob mounting portion provided at a position vertically below the center position to which a plumb bob can be attached, The horn antenna alignment jig according to claim 1, wherein the second plumb bob mounting portion is provided at multiple positions on the outer peripheral fixing portion corresponding to each of the multiple inclination angles of the horn antenna.

3. The horn antenna alignment jig according to claim 2, wherein the outer peripheral fixing portion is detachably attached to the horn antenna fixing portion.

4. A method for aligning a horn antenna using the horn antenna alignment jig described in claim 1, The alignment jig for the horn antenna is fixed to the horn antenna. The horn antenna is installed on the installation surface such that the lower end of the plumb bob attached to the first plumb bob mounting part is aligned with a position that is vertically below the center position of the horn antenna on the installation surface where the horn antenna is installed. A method for aligning a horn antenna, comprising irradiating it with a laser using the laser irradiation device and adjusting the orientation of the horn antenna so that the laser reaches a point that reflects the electromagnetic waves transmitted from the horn antenna.

5. A method for aligning a horn antenna using the horn antenna alignment jig described in claim 2, The horn antenna alignment jig is fixed to the horn antenna, and the horn antenna is positioned so that the opening faces diagonally upward. The horn antenna is installed on the installation surface such that the lower end of the plumb bob attached to the second plumb bob mounting part, which corresponds to the tilt angle of the horn antenna, is aligned with a position that is vertically below the center position of the horn antenna on the installation surface where the horn antenna is installed. A method for aligning a horn antenna, comprising irradiating it with a laser using the laser irradiation device and adjusting the orientation of the horn antenna so that the laser reaches a point that reflects the electromagnetic waves transmitted from the horn antenna.

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