JP2011035832A - Antenna strut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna strut that facilitates installation within a short time, even in the night or on a rainy day and with which a coaxial cable can also be reliably connected simultaneously with strut connection. <P>SOLUTION: An antenna strut 11 is configured with a prescribed height by connecting struts 12a, 12b, .... The upper-side strut 12a includes: a strut fastening nut 31 outside a lower end; a tapered part with an outer diameter at a distal end side being reduced sequentially on an outer circumferential surface of the lower end; and a jack side connector 40 inside the lower end. As for the lower-side strut 12b, its diameter of an upper end is formed a little large, so that the lower-side strut can be connected with the strut 12a, and there are provided a male screw on an outer circumferential surface of the upper end, a tapered part on an inner peripheral surface of the upper end, and a plug-side connector 58 inside the upper end. When connecting struts, the strut fastening nut 31 of the strut 12a is screwed with the male screw of the strut 12b and fastened, the tapered part at a side of the strut 12a is slid along with the inside of the tapered part at a side of the strut 12b, the struts 12a, 12b are coupled and simultaneously, the connectors 40, 58 are connected. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an antenna support for facilitating the establishment and removal of a portable antenna.

  Conventionally, when installing a portable antenna for communication outdoors in a place that is somewhat higher than the ground, the antenna is mounted using a column of a predetermined length, but if the column is too long, it is not easy to carry The column is divided into a plurality of columns such as two or three, and the length of each divided column is reduced to about 1.2 m so that it can be easily carried. Then, at the place where the antenna is actually installed, a plurality of divided support columns are connected to install the antenna at a required height.

  10A and 10B show a state where an antenna is attached to a conventional antenna support and is installed on the ground. FIG. 10A is a side view and FIG. 10B is a plan view. As shown in FIG. 10, the antenna support column 1 is configured to have a required height by connecting a plurality of divided support columns 1 a to 1 c, for example, into three parts, and the bottom plate 2 is attached to the lower end portion so as to be perpendicular to the ground 3. Install in. The divided struts 1a to 1c are configured by using cylindrical metal pipes. When connecting, the divided struts 1a to 1c are connected by a method such as narrowing one diameter of the strut connecting portion and inserting it into the other strut. Yes.

  FIG. 11 shows the configuration of the divided struts 1a to 1c, where (a) is a side view and (b) is a bottom view. At the upper ends of the divided struts 1a to 1c, a strut connecting portion 4 having a thin outer diameter is provided so that it can be inserted into the lower end of the upper divided strut. Further, the column connection portion 4 is provided with two cuts 5 at an upper end portion at an interval of 180 °. Furthermore, two anti-rotation projections 6 are provided at intervals of 180 ° on the lower inner sides of the divided struts 1a to 1c at portions above the lower end by a predetermined distance. When the divided struts 1a to 1c are connected to each other, the anti-rotation protrusions 6 provided on the other-side struts are located at the notches 5 provided in the strut connecting portions 4, and the mutual positions of the divided struts 1a to 1c are Fixed. In addition, the support | pillar connection part 4 does not need to be provided in the division | segmentation support | pillar 1a of the uppermost stage.

  As shown in FIG. 10, a circular support plate 7 is provided at the upper end of the antenna support 1, and a plurality of, for example, three tension ropes 8 a to 8 c are attached to the support plate 7 at an equal angle. The lower ends of the tension ropes 8 a to 8 c are fixed to the ground 3 by the piles 9. The communication portable antenna 10 is attached to the upper end of the antenna support 1, that is, the upper side of the support plate 7.

  Although not shown, a feeding coaxial cable is connected to the feeding portion of the antenna 10. The coaxial cable is provided along the outside of the antenna support 1 and is fixed to the support 1 at a key point.

  Further, as a known technique related to the present invention, in a conical monopole antenna used in a medium wave band and a short wave band, a support post length is shortened to about 1/20 wavelength of a use frequency, a loading element, a loading coil, and a matching element. 2. Description of the Related Art A portable broadband antenna device is known in which a horizontal stay is not required by adding a device or the like to reduce the weight and facilitate opening and withdrawal (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 5-36916

  As described above, when the communication portable antenna 10 is attached to the antenna support column 1 outdoors, the divided support columns 1a to 1c are connected so that the antenna mounting position becomes a predetermined height. When connecting the divided struts 1a to 1c, conventionally, the outer diameter of the strut connecting portion 4 is simply thinned and inserted into the divided strut positioned on the upper side. In order to hold 1 vertically, it is necessary to provide support means such as attaching the tension ropes 8a to 8c to the support plate 7 and pulling it strongly on the ground. I need time.

  In addition, when connecting a power feeding coaxial cable in the middle of the antenna support 1, a coaxial plug is connected with, for example, an N-type or BNC-type plug and jack, and a rubber tape and a vinyl tape are wrapped around the connection portion to be waterproof. It is necessary to perform processing, and the processing is very troublesome. Further, since the coaxial cable becomes long, the cable is twisted and handling thereof is not easy. Furthermore, it is difficult to see the connection portion of the coaxial cable at night or on rainy weather, and particularly when it is raining, it is necessary to take care not to rain the connection portion, and the taping work for waterproofing is not easy.

  The present invention has been made to solve the above-mentioned problems, and can be easily installed in a short time at any outdoor installation location, in the case of nighttime or rainy weather, and can be connected to a coaxial cable for feeding. The purpose of the present invention is to provide a support for an antenna that can be securely connected at the same time as the connection of the support, and does not need to be waterproofed such as taping and is very easy to handle.

  The present invention provides an antenna support in which a plurality of divided struts are connected to have a predetermined height and a communication antenna is mounted on the upper end portion, and can be rotated to one strut end portion in the connection portion of each of the split struts. A tightening nut provided; a first taper portion formed on the outer peripheral surface of the one column end portion so that the outer diameter on the distal end side sequentially decreases; and a first taper internally provided in the one column end portion. A connector, a male thread portion for connecting a post, which is provided on an outer peripheral surface of the other column end portion in the connection portion of each of the divided columns, and is screwed to the tightening nut, and an inner peripheral surface of the other column end portion And a second taper portion that is coupled to the first taper portion provided at the one column end portion and a second taper portion that is built in the other column end portion and connected to the first connector. 2 connectors and provided in each of the divided struts And a coaxial cable connected to connectors attached to both ends of the divided strut, and a male nut provided on the outer peripheral surface of the other strut end. Screwing and tightening to a threaded portion, and joining the first tapered portion and the second tapered portion to connect the divided struts and connect the first connector and the second connector; It is characterized by.

  According to the present invention, it is possible to assemble the antenna support column very easily just by aligning the position of the connecting portion of each divided support column and tightening the tightening nut. The antenna support can be installed in a short time and can be disassembled very easily.

  Moreover, since the connector for coaxial cable connection is built in the connection part of each division | segmentation support | pillar, the coaxial cable for electric power feeding can be connected simultaneously with the assembly of a support | pillar. Therefore, it is not necessary to provide a power supply coaxial cable along the outside of the antenna support, and it is not necessary to wrap the tape around the connection portion of the coaxial cable to perform waterproofing. Furthermore, even when the connection portion of the coaxial cable is difficult to see at night or in the rain, the coaxial cable can be connected very easily and reliably. In addition, since the strength of the connecting portion of the support is high, when the support for the antenna is not so high, the support for the antenna can be securely held without attaching a tension rope.

It is a side view which shows the state which attached the antenna to the antenna support | pillar which concerns on Example 1 of this invention, and was installed in the earth. In the antenna support | pillar which concerns on the Example 1, it is a side view which shows the state which connected between two division | segmentation support | pillars, partially cross-sectionally. The structure of the lower connection part of the division | segmentation support | pillar in the Example 1 was shown, (a) is a side view which shows a part in cross section, (b) is a bottom view. 3A and 3B show a configuration of a lower end portion of the divided support column in FIG. 3, in which FIG. 3A is a side view showing a partial cross section, and FIG. 3A and 3B show a configuration of a tightening nut in FIG. 3, wherein FIG. 3A is a side view showing a part of the tightening nut, and FIG. 4A and 4B show a configuration of a jack-side connector in FIG. 3, in which FIG. 3A is a side view showing a part of the jack-side connector, and FIG. The structure of the upper connection part of the division | segmentation support | pillar in the Example 1 was shown, (a) is a side view which shows a part in cross section, (b) is a top view. FIGS. 8A and 8B show a configuration of an upper end portion of the divided support column in FIG. 7, in which FIG. FIG. 8 is a side view showing a part of the plug-side connector in FIG. The state which attached the antenna to the conventional antenna support | pillar, and showed the state installed on the ground is shown, (a) is a side view, (b) is a top view. The structure of each division | segmentation support | pillar in FIG. 10 is shown, (a) is a side view, (b) is a bottom view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1A and 1B show a state where an antenna is attached to an antenna column according to Embodiment 1 of the present invention and is installed on the ground, where FIG. 1A is a side view and FIG. 1B is a plan view.

  As shown in FIG. 1, the antenna support 11 is configured to have a required height by connecting a plurality of, for example, three divided support posts 12 a to 12 c, and a bottom plate 13 is attached to the lower end portion so as to be perpendicular to the ground 14. Install in. The bottom plate 13 is fixed to the ground 14 by a pile (not shown). The divided struts 12a to 12c are configured using cylindrical metal pipes, and each strut connection portion includes a connection mechanism and a cable connection connector, which will be described in detail later. Rubber boots 15a and 15b are put on the connecting portions of the divided struts 12a to 12c after the connection is completed.

  Further, a waterproof member such as a waterproof rubber cap 16 is attached to the upper end opening of the split column 12a located at the top. A power feeding coaxial cable 17a is inserted in advance into the divided support column 12a, and the upper end portion of the coaxial cable 17a is led out through an insertion hole provided in the central portion of the waterproof rubber cap 16. A coaxial plug 18 is provided at the leading end portion of the feeding coaxial cable 17a that is led out from the column. A portable antenna 21 for communication is attached to the upper end portion of the antenna support 11 by a mounting bracket 20. As the communication portable antenna 21, an arbitrary portable antenna such as a three-element Yagi antenna is used. A coaxial cable 22 is connected to the feeding portion of the antenna 21, and a coaxial plug 23 is provided at the tip thereof. As shown in FIG. 1, the antenna and the feeding coaxial cable are electrically connected by the coaxial plug 18 and the coaxial plug 23 at the upper part of the antenna column. Although not shown in FIG. 1, a rubber boot used at the connecting portion of the antenna support is covered with the connecting portion of the coaxial plug 18 and the coaxial plug 23 to provide a waterproof function.

  As will be described in detail later, the power feeding coaxial cable is provided separately in each of the divided columns 12a to 12c, and is connected by a connector (connector) when the divided columns 12a to 12c are joined together.

  Next, the structure of the connection part of the said division | segmentation support | pillar 12a-12c is demonstrated.

  FIG. 2 is a side view showing a partial cross section of the state where the divided struts 12a and 12b are connected. 3A and 3B show the configuration of the lower connecting portion of the divided support column 12a. FIG. 3A is a side view showing a part of the divided support 12a, and FIG. 3B is a bottom view. 4A and 4B show the structure of the lower end portion of the divided support column 12a. FIG. 4A is a side view showing a part of the divided support column 12a, and FIG. FIGS. 5A and 5B show the structure of the column tightening nut 31 mounted on the outer side of the lower end portion of the divided column 12a. FIG. 5A is a side view showing a part of the nut, and FIG. 6A and 6B show a configuration of a plug attached to the inner side of the lower end of the divided support column 12a. FIG. 6A is a side view showing a part of the plug, and FIG. 6B is a bottom view.

  7A and 7B show the structure of the upper connecting portion of the divided support column 12b. FIG. 7A is a side view showing a part of the divided support column 12b, and FIG. 8A and 8B show the configuration of the upper end portion of the divided column 12b. FIG. 8A is a side view showing a part of the divided column 12b, and FIG. 8B is a top view. FIG. 9 is a side view showing a partial cross section of the plug-side connector provided at the upper connection portion of the divided support column 12b. 2 to 9 show the configuration of the connecting portion between the divided struts 12a and 12b. However, since the connecting portion between the divided struts 12b and 12c has the same configuration, detailed description thereof will be omitted.

  As shown in FIGS. 2 and 3, a column tightening nut 31 is rotatably provided outside the lower end portion of the divided column 12 a. In this case, a C-shaped retaining ring 32 is provided between the divided column 12a and the column clamping nut 31 so that the column clamping nut 31 does not come off from the divided column 12a. That is, as shown in FIGS. 4 and 5, the column tightening nut 31 is provided with a retaining ring groove 33a along the inner peripheral surface in the vicinity of the upper end portion, and an outer peripheral surface having a predetermined height from the lower end of the divided column 12a. Is provided with a retaining ring groove 33b. Further, by interposing the C-shaped retaining ring 32 in the retaining ring grooves 33a and 33b, the column tightening nut 31 can be rotated and prevented from being detached from the divided column 12a.

  As shown in FIG. 5, the column tightening nut 31 is provided with a small-diameter portion 25 on the inner upper portion and a large-diameter portion 26 on the inner lower portion. The column tightening nut 31 has a small-diameter portion 25 attached to the divided column 12a. The inner diameter of the small-diameter portion 25 is slightly larger than the diameter of the antenna column 11, and is rotatable with respect to the divided column 12a. . A retaining ring groove 33 a is provided in the small-diameter portion 25 of the column tightening nut 31.

  The column tightening nut 31 is provided with a thread groove 35 for attaching the divided column 12b to the inner peripheral surface of the large-diameter portion 26, and a knurling process 36 is applied to the outer peripheral surface.

  Further, the split strut 12a is formed with a connector mounting screw groove 38 on the inner peripheral surface of the lower end portion, and a tapered portion 39 having a predetermined length, for example, a length of about 20 mm, on the outer peripheral surface of the lower end portion. The taper portion 39 is provided so as to be positioned in the large diameter portion 26 of the column tightening nut 31 and is formed so that the outer diameter on the lower end side of the divided column 12a is sequentially reduced.

  As shown in FIGS. 2 and 3, the jack-side connector 40 is screwed into the connector mounting screw groove 38 provided on the inner peripheral surface of the lower end portion of the divided column 12 a. As shown in detail in FIG. 6, the jack-side connector 40 has a screw portion 42 formed on the outer peripheral surface of a cylindrical connector body 41, and this screw portion 42 is provided in a connector mounting screw groove 38 provided in the divided column 12a. Screwed on. A cylindrical outer conductor 44 is provided on the lower tip side of the connector main body 41 via a circular attachment portion 43, and a cylindrical central conductor 45 is provided concentrically at the center thereof. A cylindrical insulator 46 is provided on the outer peripheral surface of the center conductor 45.

  The outer conductor 44 is provided with two projections 47a and 47b at an interval of 180 ° on the outside near the tip. The protrusions 47a and 47b are provided so as to be in sliding contact with the inner peripheral surface of the cylindrical shell 59 of the plug-side connector 58 when connecting to the plug-side connector 58 shown in FIG. Further, two spanner hooks 48a and 48b are provided on the outer peripheral edge of the mounting portion 43 at intervals of 180 °. The coaxial cable 17 a is connected to the upper end side of the jack-side connector 40. As shown in FIG. 1, the upper end portion of the coaxial cable 17a provided on the uppermost split column 12a is led out to the outside from the upper end portion of the split column 12a, and the coaxial connector 18 is attached to the tip.

  The upper connection portion of the divided support column 12b shown in FIG. 7 is connected to the lower connection portion of the divided support column 12a configured as described above. As shown in FIG. 2, the divided strut 12b is formed such that the diameter Da on the upper end side constituting the upper connecting portion is larger by, for example, about 5 mm than the diameter of the lower portion, that is, the diameter Db of the lower connecting portion of the divided struts 12a and 12b. The lower end portion of the divided column 12a can be inserted inside the upper end of the divided column 12b. In addition, since the antenna 21 is attached to the upper end of the divided support column 12a located at the uppermost stage, the upper end side diameter does not need to be formed large.

  The split strut 12b is provided with a male screw portion 51 for connecting a strut on the outer peripheral surface of the upper end portion, and a tapered portion 52 having a predetermined length, for example, about 20 mm, on the inner peripheral surface of the upper end portion. The tapered portion 52 corresponds to the tapered portion 39 provided on the divided support column 12a, and is formed so that the inner diameter of the upper end side of the divided support column 12b is sequentially increased. The tapered portion 52 corresponds to the tapered portion 39 provided on the divided column 12a. When the divided columns 12a and 12b are connected, the lower end of the divided column 12a is inserted inside the upper end of the divided column 12b, and the tapered portion is formed. 39 and 52 are connected in contact.

  In addition, for example, two set screw screw holes 53 are provided on the outer periphery of the divided strut 12b at a predetermined length below the upper end at an interval of, for example, about 135 °. For example, two positioning screw holes 54 are provided at an interval of 180 ° at a position below about 8 mm. There is no positional relationship between the above and the set screw screw hole 53 and the positioning screw hole 54, and can be arbitrarily set. A set screw 55 is screwed into the set screw screw hole 53, and a positioning screw 56 is screwed into the positioning screw hole 54.

  And the plug side connector 58 connected with the jack side connector 40 provided in the division | segmentation support | pillar 12a is mounted | worn in the said division | segmentation support | pillar 12b. In the plug-side connector 58, a cylindrical outer conductor 60 is provided concentrically inside a cylindrical shell 59, an insulator 61 is provided along the inner side of the outer conductor 60, and a rod-like member is provided at the center thereof. Center conductor 62 is provided. The outer conductor 60 is provided with a plurality of slots. A coaxial cable 17b is attached to the lower end side of the cylindrical shell 59, and the outer conductor and the center conductor of the coaxial cable 17b are respectively connected to the outer conductor 60 and the center conductor 62 of the plug-side connector 58 in the cylindrical shell 59. Connected.

  The cylindrical shell 59 has a central portion on the outer surface that is smaller in diameter than both upper and lower ends, and the set screw 55 is pressed against the small diameter portion 63 and is fixed in the divided strut 12b. Further, the cylindrical shell 59 has its lower end portion in contact with the distal end side portion of the positioning screw 56, whereby the vertical position is determined. In this case, the cylindrical shell 59 is set so that the position of the upper end is positioned, for example, about 4 mm below the position of the lower end of the tapered portion 52.

  When the plug-side connector 58 is mounted inside the upper end portion of the split column 12b, the plug-side connector 58 is inserted from the upper end opening of the split column 12b with the set screw 55 loosened, and the lower end of the connector 58 is positioned. It abuts on the screw 56 for use. In this state, the set screw 55 is tightened, and the tip thereof is pressed against the small diameter portion 63 of the cylindrical shell 59 to fix the position of the plug-side connector 58.

  When assembling the antenna support column 11 configured as described above, first, the lower connection portion of the divided support column 12a and the upper connection portion of the divided support column 12b are connected. In this case, the tapered portion 39 provided at the lower portion of the divided support column 12a is positioned inside the tapered portion 52 provided at the upper end portion of the divided support column 12b, and the external thread portion for connecting the support column provided on the outer upper end of the divided support column 12b. The tip of 51 is brought into contact with the lower opening of the column tightening nut 31 provided at the lower connection portion on the divided column 12a. Then, the column tightening nut 31 is screwed into the male screw portion 51 provided on the divided column 12b and tightened. Along with the tightening of the column tightening nut 31, the tapered portion 39 on the divided column 12a side slides along the inside of the tapered portion 52 on the divided column 12b side, so that the divided columns 12a and 12b are securely coupled to each other. At the same time, the plug-side connector 58 provided at the upper connection portion of the split column 12b is press-fitted into the jack-side connector 40 provided at the lower connection portion of the split column 12a, and both are electrically connected. That is, the center conductor 62 of the plug-side connector 58 is press-fitted into the cylindrical center conductor 45 of the jack-side connector 40, and the outer conductor 60 of the plug-side connector 58 is press-fitted into the outer conductor 44 of the jack-side connector 40. Both are electrically connected. Further, protrusions 47 a and 47 b provided on the outer side of the outer conductor 44 of the jack-side connector 40 are inserted while being in sliding contact with the inner side of the cylindrical shell 59 of the plug-side connector 58, so that the outer conductor 44 of the jack-side connector 40 and the plug-side connector 58 are inserted. The cylindrical shell 59 is electrically connected. After the connection between the divided struts 12a and 12b is completed, as shown in FIGS. 1 and 2, the rubber boot 15a previously inserted in the strut 12a is slid and covered with a connecting portion to have a waterproof function.

  Further, the lower connecting portion of the divided strut 12b and the upper connecting portion of the divided strut 12c are connected in the same manner as the case where the divided struts 12a and 12b are connected, and the connecting portion is covered with the rubber boot 15b.

  And the portable antenna 21 for communication is attached to the upper end of the antenna support | pillar 11 which couple | bonded the said division | segmentation support | pillars 12a-12c with the attachment bracket 20 as shown in FIG. Further, the bottom plate 13 is fixed to a predetermined position of the ground 14 by a pile, and the antenna support 11 is attached to the bottom plate 13.

  When disassembling the antenna post 11, the rubber boots 15a and 15b are shifted from the post connecting portion to loosen the post tightening nut 31, so that the taper portions 39 and 52 are disengaged. At the same time, the jack side connector 40 and the plug side connector 58 are removed. There is a gap. Thus, the antenna column 11 can be disassembled easily and in a short time by simply loosening the column tightening nut 31.

  As shown in the first embodiment, it is possible to assemble the antenna support 11 very easily just by aligning the positions of the connecting portions of the divided support posts 12a to 12c and tightening the support tightening nut 31, regardless of day or night. The antenna support can be installed in a very short time without being influenced by the weather, and the dismantling thereof can be performed very easily.

  Moreover, since the connector for coaxial cable connection is built in the connection part of the division | segmentation support | pillars 12a-12c, the coaxial cables 17a, 17b, ... for electric power feeding can be connected simultaneously with the assembly of the division | segmentation support | pillars 12a-12c. Therefore, it is not necessary to provide a coaxial cable for feeding along the outside of the antenna support 11, and it is not necessary to perform a waterproof process by wrapping a tape around the connection portion of the coaxial cable. Furthermore, even when the connection portion of the coaxial cable is difficult to see at night or in the rain, the coaxial cable can be connected very easily and reliably. Moreover, since the strength of the connecting portion of the divided struts 12a to 12c is large, when the antenna strut 11 is not so high, the antenna strut can be securely held without attaching a tension rope.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

  DESCRIPTION OF SYMBOLS 11 ... Antenna support | pillar, 12a, 12b, 12c ... Split support | pillar, 13 ... Bottom plate, 14 ... Ground, 15a, 15b ... Rubber boot, 16 ... Waterproof rubber cap, 17a, 17b ... Coaxial cable for electric power feeding, 18 ... Coaxial plug, DESCRIPTION OF SYMBOLS 20 ... Mounting bracket, 21 ... Communication portable antenna, 22 ... Coaxial cable, 23 ... Coaxial plug, 25 ... Small diameter part of a nut, 26 ... Large diameter part of a nut, 31 ... Nut support nut, 32 ... C type stop Ring, 33a, 33b ... retaining ring groove, 35 ... thread groove, 36 ... knurled, 38 ... connector mounting screw groove, 39 ... post taper, 40 ... jack side connector, 41 ... connector body of jack side connector , 42 ... Screw portion of the jack side connector, 43 ... Mounting portion of the jack side connector, 44 ... Outer conductor of the jack side connector, 45 ... Center conductor of the jack side connector 46 ... Insulator of jack side connector, 47a, 47b ... Protrusion of jack side connector, 48a, 48b ... Spanner hanger, 51 ... Male thread part for supporting column, 52 ... Taper part of supporting column, 53 ... Screw hole for set screw 54 ... Positioning screw hole, 55 ... Set screw, 56 ... Positioning screw, 58 ... Plug side connector, 59 ... Cylindrical shell of plug side connector, 60 ... Outer conductor of plug side connector, 61 ... Plug side connector Insulator, 62... Central conductor of plug-side connector, 63... Small diameter portion of plug-side connector.

Claims (1)

In the antenna strut that connects the divided struts divided into a plurality of heights and attaches the communication antenna to the upper end,
A tightening nut that is rotatably provided at one column end in the connection portion of each of the divided columns, and a first nut formed on the outer peripheral surface of the one column end so that the outer diameter on the distal end side is sequentially reduced. A taper portion, and a first connector built in the one column end,
Provided on the outer peripheral surface of the other strut end portion in the connecting portion of each split strut, formed on the male peripheral portion of the strut connection screwed to the tightening nut, and the inner peripheral surface of the other strut end portion. A second taper portion that is coupled to the first taper portion provided at the one column end portion, and a second connector that is built in the other column end portion and connected to the first connector And a coaxial cable provided in each of the divided columns and connected to connectors attached to both ends of the divided column.
The tightening nut provided at the one column end is screwed to the male screw portion provided on the outer peripheral surface of the other column end, and the first taper portion and the second taper portion are tightened. An antenna column, wherein the divided columns are connected to each other and the first connector and the second connector are connected to each other.

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