JP2017228840A - Retainer of antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer of antenna device capable of adjusting the orientation of an antenna element by smaller angle unit compared to the case where an installation angle is adjusted using a bolt inserted into a hole selected from plural bolt insertion holes.SOLUTION: A retainer 6 of an antenna device 1 for holding the antenna device 1 with an antenna element 3, which is disposed in a radome 4 rotatably relative to a post 9, includes: a bottom portion 61 that supports the lower end of the radome 4 and receives the weight of the antenna device 1; an annular part 62 which has inner peripheral surfaces 621a and 622a opposing the outer periphery face 4a of the radome 4; and first and second bolts 71 and 72 for restricting the radome 4 from rotating with respect to the annular part 62.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a holder for holding an antenna device used, for example, in a mobile phone base station.

  2. Description of the Related Art Conventionally, there is an antenna device holder that can be attached to a column installed on a rooftop of a building, and the angle of attachment to the column can be adjusted to radiate electromagnetic waves in a desired direction (see, for example, Patent Document 1). ).

  The holder of the antenna device described in Patent Document 1 includes a mounting bracket fixed at two positions above and below the support and a pair of support plates fixed to each mounting bracket. The support board is provided with one through hole through which the adjustment bolt is inserted, and the mounting bracket is provided with a plurality of bolt insertion holes as azimuth angle adjustment holes. An adjustment bolt is inserted into one azimuth adjustment hole selected in accordance with the radiation direction of the electromagnetic wave among the plurality of azimuth adjustment holes, and the adjustment nut is screwed into the tip of the adjustment bolt, whereby the antenna for the support column The angle of the device is fixed.

JP 2012-34187 A

  In the antenna device holder described in Patent Document 1, the antenna mounting angle can be adjusted by selecting one azimuth angle adjusting hole from among a plurality of azimuth angle adjusting holes. Depends on the spacing of the azimuth adjustment holes. If FIG. 1 of patent document 1 is referred, since the seven azimuth angle adjustment holes are provided in the range of 90 degrees, the angle adjustment unit in the said antenna is about 15 degrees. For this reason, adjustment of the mounting angle of the antenna is restricted by the interval of the azimuth adjustment holes, and the radiation direction may not be adjusted accurately.

  Therefore, the present invention adjusts the orientation of the antenna element in fine angle units as compared with the case where the mounting angle is adjusted by inserting the bolt into one selected bolt insertion hole among the plurality of bolt insertion holes. It is an object of the present invention to provide an antenna device holder that can be used.

  In order to solve the above-mentioned problems, the present invention provides a holder for an antenna device in which an antenna element is rotatably held with respect to a support member, the antenna device being arranged inside a cylindrical housing member, A bottom portion that supports the lower end portion of the housing member and receives the weight of the antenna device, an annular portion having an inner circumferential surface facing the outer circumferential surface of the housing member, and the rotation of the housing member relative to the annular portion are restricted. There is provided a holder for an antenna device having a detent member.

  According to the holder of the antenna device according to the present invention, compared to a case where the mounting angle is adjusted by inserting a bolt through one selected bolt insertion hole among the plurality of bolt insertion holes, in units of fine angles. The direction of the antenna element can be adjusted.

It is a perspective view which shows the antenna apparatus which concerns on embodiment of this invention with the support | pillar fixed to the support | pillar and the support | pillar. It is a perspective view which shows the reflecting plate and several antenna element which were accommodated in the radome of the antenna apparatus. (A) is sectional drawing which cut | disconnected the radome and the lid member along the central axis of a radome, (b) is the top view of the lid member which looked at the antenna apparatus along the central axis of the radome. It is a perspective view which shows the holder of an antenna device alone. It is the sectional view on the AA line which cut | disconnected the holder shown in FIG. 4 along the direction orthogonal to the central axis of a radome. It is the figure which looked at the state where the antenna apparatus was fixed to the holder from the upper part.

[Embodiment]
This embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view showing the antenna device 1 according to the present embodiment together with a support column 9 as a support member and a holder 6 that is fixed to the support column 9 and holds the antenna device 1. FIG. 2 is a perspective view showing the reflector 2 and the plurality of antenna elements 3 housed in the radome 4 of the antenna device 1.

  The antenna device 1 is used, for example, as an antenna for a base station of a mobile phone, and is installed at a high place such as a rooftop of a building. The antenna device 1 includes a reflecting plate 2 made of a plate-like conductive metal, a plurality of antenna elements 3 fixed to the reflecting plate 2, and a cylindrical housing member in which the plurality of antenna elements 3 are arranged. A radome 4 and an end member 5 that closes an opening on one end side of the radome 4 are provided.

  The radome 4 has a cylindrical shape made of an insulating resin such as FRP (fiber reinforced plastics). The antenna device 1 is attached to the support column 9 while being held by the holder 6 so that the longitudinal direction (center axis direction) of the radome 4 is the vertical direction. The lower end of the radome 4 is open, and a coaxial cable 8 connected to the transmission line from the opening of the lower end is introduced into the radome 4. A signal transmitted or received by the antenna element 3 is transmitted through the coaxial cable 8. In the following description, “upper” and “lower” refer to the vertical direction when the antenna device 1 is attached to the support column 9.

  The holder 6 supports a lower end portion of the radome 4 and receives the weight of the antenna device 1, and a cylindrical first member extending upward from the outer peripheral end portion of the bottom portion 61 along the longitudinal direction of the radome 4. A first annular portion 621, and an annular portion 62 having a cylindrical second annular portion 622 arranged in parallel with a gap between the first annular portion 621 along the longitudinal direction of the radome 4, and first and second A connecting portion 63 that extends along the longitudinal direction of the radome 4 between the annular portions 621 and 622 and connects the first and second annular portions 621 and 622, and a column that extends from both left and right ends of the connecting portion 63. 1 and 2nd attachment parts 641 and 642 attached to 9.

  The inner peripheral surface 621 a of the first annular portion 621 and the inner peripheral surface 622 a of the second annular portion 621 are opposed to the outer peripheral surface 4 a of the radome 4. In the present embodiment, the bottom portion 61 is provided at the lower end portion of the first annular portion 621, and the bottom portion 61 and the first annular portion 621 are integrally formed. However, the present invention is not limited to this. The first annular portion 621 and the bottom portion 61 may be provided separately.

  As shown in FIG. 2, the reflecting plate 2 is a rectangular member made of a conductive metal such as aluminum, and is electrically grounded by a ground wire (not shown). Fixing members 21 a to 21 d for fixing to the radome 4 are attached to both ends in the longitudinal direction of the reflecting plate 2. The reflector 2 is fixed to the radome 4 by fixing the fixing members 21a to 21d to the radome 4 with bolts or rivets.

  The antenna element 3 is a printed dipole antenna composed of a printed board on which a not-illustrated wiring pattern that functions as a radiating element or a receiving element is formed on a plate-like dielectric. The antenna element 3 has a horizontal polarization antenna element 31 capable of transmitting or receiving horizontal polarization and a vertical polarization antenna element 32 capable of transmitting or receiving vertical polarization in a cross shape. It is formed to intersect.

  In the present embodiment, eight antenna elements 3 are arranged along the longitudinal direction of the reflector 2. Each antenna element 3 is connected to a transmission line for transmitting a high-frequency signal transmitted or received by the antenna element 3 on the back surface 2b side opposite to the reflecting surface 2a of the reflecting plate 2.

  FIG. 3A is a cross-sectional view of the radome 4 and the end member 5 cut along the central axis of the radome 4. FIG. 3B is a diagram when the antenna device 1 is viewed downward along the central axis of the radome 4. In FIG. 3A, the radome 4 and the reflector 2 and the antenna element 3 accommodated in the radome 4 are indicated by broken lines.

  As shown in FIG. 3A, the reflector 2 is accommodated in the radome 4 so that the longitudinal direction thereof is along the central axis direction of the radome 4. The upper end portion of the radome 4 when the antenna device 1 is attached to the support column 9 is blocked by the end member 5, so that intrusion of rainwater or the like into the radome 4 is suppressed.

  The end member 5 includes a disc-shaped lid 51 that closes one end (upper end) of the radome 4, and a fitting that extends downward from the outer peripheral edge of the lid 51 and fits to one end of the radome 4. And a joint portion 52. The fitting portion 52 has a cylindrical shape that is fitted on one end portion of the radome 4 and is fixed to the radome 4 by, for example, bolt fastening. The fitting portion 52 may be fixed to the radome 4 by adhesion. The end member 5 is made of, for example, injection molded resin.

  As shown in FIG. 3B, the end member 5 is provided with a scale portion 5a. In the present embodiment, the scale portion 5a is provided in a predetermined angular range at the end portion on the outer peripheral side of the upper surface 51a of the lid portion 51 (the surface opposite to the surface facing the reflector 2 in the radome 4). Yes. The scale part 5a consists of a plurality of scale lines formed at intervals of 1 °, for example.

  FIG. 4 is a perspective view illustrating a configuration example of the holder 6. FIG. 5 is a cross-sectional view taken along line AA of the holder 6 shown in FIG. 4 so as to be orthogonal to the axial direction of the radome 4 and to include the first and second through holes 622b and 622c of the second annular portion 622. FIG. In FIG. 5, the outer peripheral surface 4 a of the radome 4 of the antenna device 1 held by the holder 6 is indicated by a two-dot chain line.

  As shown in FIG. 4, first and second through holes 622 b and 622 c penetrating in the radial direction are formed in the second annular portion 622 of the holder 6. In the present embodiment, the first through hole 622b and the second through hole 622c are provided at positions shifted by 180 degrees in the circumferential direction.

  The second annular portion 622 of the holder 6 is provided with a pointer portion 6b. In the present embodiment, the pointer portion 6 b has a triangular shape and is provided at a predetermined position on the upper end surface of the second annular portion 622. However, the pointer portion 6b may be, for example, a single straight line or an arrow shape. In addition, the pointer portion 6 b may be provided on the outer peripheral surface of the second annular portion 622.

  The pointer part 6b points to one place of the scale part 5a (see FIG. 6 described later). That is, the relative rotational position of the radome 4 and the end member 5 with respect to the support column 9 can be recognized by the position of the scale portion 5a pointed to by the pointer portion 6b. The pointer part 6b is an aspect of the “recognition part” in the present invention. Note that a pointer portion may be provided on the end member 5 and a scale portion may be provided on the second annular portion 622 of the holder 6. In this case, the scale portion corresponds to the “recognition portion” of the present invention. That is, any one member of the end member 5 and the holder 6 may be provided with the scale portion and the other member may be provided with the pointer portion.

  As shown in FIG. 5, an insertion hole 61 a for inserting the coaxial cable 8 is formed in the bottom 61 of the holder 6. The insertion hole 61 a is a hole that penetrates the bottom portion 61 along the axial direction of the first annular portion 621. Further, the inner diameters of the first and second annular portions 621 and 622 in the holder 6 are formed to be at least larger than the outer diameter of the radome 4 (two-dot chain line).

  The first and second through holes 622b and 622c of the second annular portion 622 are first and second anti-rotation members that restrict the rotation of the radome 4 relative to the first and second annular portions 621 and 622 of the holder 6. Two bolts 71 and 72 are inserted. The first bolt 71 is screwed into a female screw formed in the first through-hole 622 b, and a tip portion of the first bolt 71 comes into contact with the outer peripheral surface 4 a of the radome 4. Similarly, the second bolt 72 is screwed into a female screw formed in the second through-hole 622 c, and a tip portion thereof abuts on the outer peripheral surface 4 a of the radome 4. As a result, the radome 4 is sandwiched between the respective front ends of the first and second bolts 71 and 72, and the rotation of the radome 4 relative to the holder 6 is restricted. That is, the radome 4 is prevented from rotating with respect to the holder 6 by the tightening force of the first and second bolts 71 and 72.

  As shown in FIGS. 4 and 5, the first attachment portion 641 includes an extending portion 641 a that extends linearly from the side surface of the connecting portion 63, and a column that is continuous from the tip of the extending portion 641 a on the column 9 side. 9 and an arcuate portion 641b that is curved along the outer periphery. Similarly, the second attachment portion 642 is formed to extend from the side surface of the connecting portion 63 in a straight line, and to bend along the outer periphery of the support column 9 continuously from the tip of the extending portion 642a. Arc portion 642b.

  A pair of attachment holes 641c are formed in the arc portion 641b of the first attachment portion 641 so that the bolts 81 fixed to the column 9 are inserted therethrough. Similarly, a pair of mounting holes 642c through which bolts 82 for fixing to the support column 9 are inserted are formed in the arc portion 642b of the second mounting portion 642. Although not shown in the drawings, the support 9 is also provided with female screws to which the bolts 81 and 82 are screwed at positions corresponding to the pair of mounting holes 641c of the first mounting portion 641 and the pair of mounting holes 642c of the second mounting portion 642. A formed bolt hole is provided.

  FIG. 6 is a view of the holder 6 that holds the antenna device 1 as viewed from above. In FIG. 6, the radome 4, the reflector 2 accommodated in the radome 4, the antenna element 3, and the like are indicated by two-dot chain lines.

  As shown in FIG. 6, the antenna device 1 has directivity such that when the antenna element 3 radiates an electromagnetic wave w, the electric field strength of the electromagnetic wave w becomes stronger in a direction perpendicular to the reflector 2. . When a plurality of antenna devices 1 are attached to the column 9, each antenna device 1 is attached such that the electromagnetic waves w radiated from the respective antenna devices 1 are directed in different directions. In the present embodiment, the outer diameter of the end member 5 and the inner diameter of the second annular portion 622 of the holder 6 have substantially the same dimensions.

  In the present embodiment, when the antenna device 1 is fixed to the holder 6 fixed to the support column 9, first, the lower end portion of the radome 4 is moved from the second annular portion 622 side of the holder 6 to the first annular portion 621. Inserting inward, the lower end of the radome 4 is brought into contact with the bottom 61. At this time, the coaxial cable 8 is inserted into the insertion hole 61a of the bottom 61 to perform wiring work. In the state where the radome 4 and the end member 5 are inserted through the annular portion 62 of the holder 6 (the state before the first and second bolts 71 and 72 are tightened), the radome 4 rotates with respect to the holder 6. Is possible.

  For example, after confirming the scale portion 5a and the pointer portion 6b, the radome 4 and the end member 5 are rotated with respect to the holder 6 to adjust the radiation direction of the electromagnetic wave from the antenna element 3, and then the first and second The rotational position of the radome 4 is fixed by the bolts 71 and 72. This adjustment is performed based on, for example, an electromagnetic wave emitted from the antenna device 1 attached to the support 9 and the reception state of the electromagnetic wave at a predetermined place on the ground. Thereby, fixation with respect to the holder 6 of the antenna apparatus 1 is completed.

(Effect of embodiment)
According to the embodiment described above, the following effects can be obtained.

(1) The holder 6 has a bottom 61 that receives the weight of the radome 4, first and second annular portions 621 and 622 that face the outer peripheral surface 4 a of the radome 4, and the first and second annular portions 621 and 622. Since it has the 1st and 2nd volt | bolts 71 and 72 as a rotation prevention member which controls rotation of the radome 4, after rotating the radome 4 and the edge part member 5 freely with respect to the holder 6, The radome 4 can be fixed. That is, for example, as compared with the case where the mounting angle is adjusted by inserting a bolt into one selected bolt insertion hole among the plurality of bolt insertion holes as in the prior art, the radiation is radiated from the plurality of antenna elements 3. It becomes possible to adjust the radiation direction of electromagnetic waves in finer angle units. In particular, in the present embodiment, the radome 4 is cylindrical, and the first and second annular portions 621 and 622 serving as the annular portions are circular. Therefore, the radiation direction of the plurality of antenna elements 3 (radiation direction of the main beam) ) Can be adjusted steplessly.

(2) The bottom portion 61 of the holder 6 supports the weight of the reflector 2, the plurality of antenna elements 3, and the radome 4, and the radome 4 is inserted and held in the first and second annular portions 621 and 622. Therefore, the support structure of these members can be facilitated.

(3) In the present embodiment, the first and second annular portions 621 and 622 have an integrated structure in which the first and second annular portions 621 and 622 are parallel to each other along the longitudinal direction of the radome 4. The number of parts can be reduced as compared with the case where the holding members to be held with respect to the support columns are provided at two locations on the upper and lower sides. In addition, for example, the antenna device 1 can be held more stably as compared with a case where the annular portion is configured by only the single second annular portion 622.

(4) Since the end member 5 has the lid portion 51, even if the antenna device 1 is installed outdoors without a roof, it is possible to prevent intrusion of rainwater or the like from the upper end opening of the radome 4. .

(5) Since the scale member 5a is provided on the end member 5 and the pointer portion 6b is provided on the second annular portion 622 of the holder 6, the relative rotational position of the end member 5 with respect to the holder 6 can be adjusted. It becomes easy.

(6) In the present embodiment, the first and second anti-rotation members of the radome 4 with respect to the holder 6 (first and second annular portions 621 and 622) are formed on the second annular portion 622 of the holder 6. Since the first and second bolts 71 and 72 are screwed into the screw holes of the two through holes 622b and 622c, the radome 4 and the end member 5 can be prevented from rotating with respect to the holder 6 with a simple configuration. .

(7) Since the insertion hole 61a through which the coaxial cable 8 is inserted is formed in the bottom 61 of the holder 6, wiring work when attaching the antenna device 1 to the holder 6 is facilitated. That is, it is possible to improve the mounting workability.

(Summary of embodiment)
Next, the technical idea grasped from the embodiment described above will be described with reference to the reference numerals in the embodiment. However, each reference numeral in the following description does not limit the constituent elements in the claims to members or the like specifically shown in the embodiment.

[1] An antenna device (1) that holds an antenna device (1) in which a plurality of antenna elements (3) are arranged inside a cylindrical housing member (radome 4) so as to be rotatable with respect to a support member (post 9). ) And a bottom portion (61) for supporting the lower end of the housing member (4) and receiving the weight of the antenna device (1), and an outer peripheral surface of the housing member (4) ( 4a) an annular portion (62) having an inner peripheral surface (621a, 622a) opposite to the annular portion (62), and a detent member (first and second bolts) for restricting rotation of the housing member (4) relative to the annular portion (62) 71, 72), and an antenna device holder (6).

[2] The annular portion (62) includes a first annular portion (621) extending in a longitudinal direction of the accommodating member (4) from an outer peripheral end portion of the bottom portion (61), and the accommodating member (4). The antenna device holder (6) according to [1], further including a second annular portion (622) parallel to the first annular portion (621) along the longitudinal direction of the first annular portion (621).

[3] An insertion hole (61a) through which a cable (8) for transmitting a signal transmitted or received by the antenna element (3) is inserted is formed in the bottom (61), [1] or [2] The holder (6) of the antenna device (1) described in 1.

[4] Any one of [1] to [3], wherein the annular portion (62) is provided with a recognition portion (6b) capable of recognizing a rotational position of the housing member (4) with respect to the support member (9). The holder (6) of the antenna device (1) according to claim 1.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention. For example, in the above embodiment, the case where the first and second bolts 71 and 72 are inserted through the first and second through holes 622b and 622c of the second annular portion 622 has been described. The first and second bolts 71 and 72 may be inserted through the bolt insertion holes formed in the one annular portion 621. Moreover, although the said embodiment demonstrated the case where the radome 4 was pinched | interposed with two bolts (1st and 2nd bolts 71 and 72), it did not restrict to this but one or three or more bolts May prevent the radome 4 from rotating.

DESCRIPTION OF SYMBOLS 1 ... Antenna apparatus 2 ... Reflecting plate 3 ... Antenna element 4 ... Radome (accommodating member)
5 ... End member 5a ... Scale part (recognition part)
6 ... retainer 6b ... pointer part (recognition part)
61 ... bottom 61a ... insertion hole 62 ... annular part 621 ... first annular part 622 ... second annular part 71 ... first bolt (rotation prevention member)
72 ... Second bolt (non-rotating member)
8 ... Coaxial cable (cable)
9: Support (support member)

Claims (4)

An antenna device holder for holding an antenna device in which an antenna element is arranged inside a cylindrical housing member rotatably with respect to a support member,
A bottom portion for supporting a lower end portion of the housing member and receiving a weight of the antenna device;
An annular portion having an inner peripheral surface facing the outer peripheral surface of the housing member;
A detent member that restricts rotation of the housing member relative to the annular portion;
An antenna device holder comprising: The annular portion has a space between the first annular portion extending in the longitudinal direction of the housing member from the outer peripheral end portion of the bottom portion and the first annular portion along the longitudinal direction of the housing member. And having a second annular portion in parallel,
The holder for the antenna device according to claim 1. An insertion hole through which a cable for transmitting a signal transmitted or received by the antenna element is inserted in the bottom portion,
The holder of the antenna device according to claim 1 or 2. The annular part is provided with a recognition part capable of recognizing the rotational position of the housing member relative to the support member.
The antenna device holder according to any one of claims 1 to 3.

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