JP4431483B2 - Cover for multi-sided synthetic antenna - Google Patents

Description

  The present invention relates to a multi-surface synthetic antenna cover that covers a gap between antenna units in a multi-surface synthetic antenna of a master station and a relay station that is used as a transmission antenna for digital terrestrial broadcasting, for example.

  For transmission antennas used in terrestrial digital broadcasting, etc., if the horizontal plane is omnidirectional, or if there is no space to install the tower, it is not limited to horizontal plane omnidirectional. An antenna unit such as an antenna is arranged on multiple sides to combine multiple sides (for example, see Patent Document 1).

  FIG. 5 is a top view showing a main part of a multi-sided composite antenna in which antenna units are arranged in multiple faces around the upper part of the steel tower. In FIG. 5, 11 is an antenna support mechanism provided near the upper part of the steel tower, and a plurality of, for example, four antenna units 12a, 12b,. In this case, the antenna units 12a, 12b,... Are arranged so as to be positioned at equal intervals around the steel tower and are multifaceted.

As the antenna units 12a, 12b,..., For example, a twin loop antenna is used. In this dual loop antenna, an antenna element, for example, a loop element 14 is provided on the reflection plate 13, and a protective cover 15 is provided so as to cover the periphery of the loop element 14. It protects from such as.
JP 2001-185929 A

  As described above, conventionally, the antenna unit 12a, 12b,... Is provided with the protective cover 15 to protect the antenna element from rain and snow. However, by arranging the antenna units 12a, 12b,... Around the steel tower, a gap 16 is generated between the antenna units 12a, 12b,. As a result, in winter, particularly in snowy regions, there is a problem that snow falls on the gap 16 between the antenna units 12a, 12b,. In particular, transmission antennas are often installed at high altitudes, such as in mountainous areas, and therefore are greatly affected by snowfall.

  The present invention has been made to solve the above-described problem, and in a multi-surface synthetic antenna, the multi-surface synthetic antenna that can prevent snow from reaching the gap between the antenna units and surely prevent deterioration of characteristics due to snow accumulation. The purpose is to provide a cover.

The multi-plane synthetic antenna gap cover according to the present invention is a multi-plane synthetic antenna in which a plurality of antenna units covered by a protective cover whose upper surface in the width direction is formed in an arc shape are arranged in a multi-plane at predetermined intervals. It is provided so as to cover the gap between them, the surface in the width direction is formed in substantially the same arc shape as the protective cover, and both the upper and lower end portions are attached together with the protective cover of the antenna unit of the antenna unit. Features.
Further, the present invention provides a multi-surface synthetic antenna cover that covers a multi-surface synthetic antenna in which a plurality of antenna units are arranged in multiple surfaces at predetermined intervals, and is provided so as to cover each antenna unit, and the upper surface in the width direction is formed in an arc shape. And a protective cover for the antenna unit having a stepped portion formed on both sides at a predetermined length and a gap between the antenna units, the width direction surface being substantially the same circle as the protective cover. A gap cover that is formed in an arc shape and has a width that is set so that both side portions overlap the stepped portion of the protection cover, and the outer surface of the protection cover is combined with the gap cover. It is characterized by being set so as to be substantially the same plane.

  ADVANTAGE OF THE INVENTION According to this invention, the clearance between each antenna unit which comprises a polyhedral synthetic | combination antenna can be eliminated, snowfall can be prevented, and the deterioration of the characteristic accompanying snowfall can be prevented reliably.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1A and 1B show a state in which a multi-sided synthetic antenna and a gap cover according to an embodiment of the present invention are arranged around a steel tower. FIG. 1A is a top view, and FIG. It is. 2A and 2B show details of the antenna unit portion constituting the multi-plane synthetic antenna. FIG. 2A is a front view showing a part of the antenna unit, FIG. 2B is a side view, and FIG. 2C is a bottom view. is there. 3A and 3B show details of the gap cover portion, where FIG. 3A is a front view, FIG. 3B is a cross-sectional view, and FIG. 3C is a top view.

In FIG. 1, 21 a, 21 b,... Are multifaceted by antenna units arranged at equal intervals around the top of a steel tower (not shown).
As the antenna units 21a, 21b,..., For example, a double loop antenna shown in detail in FIG. In this dual loop antenna, a protective cover 24 is provided so as to cover the periphery of the loop elements 23 a and 23 b provided on the reflection plate 22. The protective cover 24 is formed using, for example, fiber reinforced plastic (FRP), and protects the loop elements 23a and 23b from rain, snow, and the like. .. Are provided between the antenna units 21a, 21b,... To prevent snow from accumulating in the gaps.

  FIG. 2 shows a configuration example of a double loop antenna used as the antenna units 21a, 21b,..., And a plurality of, for example, six loop elements 23a, 23b each having a circumference of about one wavelength are provided on the reflection plate 22. A two-row 6L twin loop antenna connected and arranged in two rows is shown.

  The reflection plate 22 is formed in a rectangular shape by, for example, an aluminum plate, and a plurality of bolt holes 27 are provided in an edge portion 26 formed along the outer peripheral edge thereof. In this case, the edge portion 26 of the reflecting plate 22 is provided with a plurality of, for example, two bolt holes 27a for mounting the gap cover 41 together with the protective cover 24 on both the left and right sides at the upper and lower ends. On the other hand, the protective cover 24 is also provided with bolt holes at positions corresponding to the bolt holes 27 and 27 a provided in the edge portion 26 of the reflecting plate 22 in the edge portion 28 of the outer peripheral circle. The reflector 22 and the protective cover 24 are fixed by bolts and nuts 29 using the bolt holes. In this case, bolts and nuts 29a are used for the bolt holes 27a for mounting the gap cover 41 together with the protective cover 24.

  For example, two rows of loop elements 23 a and 23 b are provided on the upper surface of the reflection plate 22 and are protected by the protective cover 24 as described above. The protective cover 24 has an upper surface formed in an arc shape, and has a stepped portion 31 formed so that both sides in the longitudinal direction, that is, a portion overlapping the gap cover 41 are lowered by one step, and combined with the gap cover 41. The outer surface is made flat in the state where

  The two rows of loop elements 23a and 23b are supplied with power from power supply portions 32a and 32b provided at the center, respectively, and these power supply portions 32a and 32b are led out of the reflector 22 through power supply paths 33a and 33b. And joined to one power supply end 34.

  In addition, the reflecting plate 22 is formed with a bent portion 35 by bending both side portions in the width direction to the power supply end 34 side by a predetermined length. In this case, when the antenna units 21a, 21b,... Are mounted around the steel tower, the reflector 22 and the bent portions are arranged so that the bent portions 35 of the antenna units 21a, 21b,. An angle with 35 is set. The bent portion 35 is provided with a plurality of bolt holes (not shown) for mounting the gap cover 41 at predetermined intervals.

And the said clearance gap cover 41 is comprised as shown to Fig.3 (a)-(c).
The gap cover 41 is formed of a synthetic resin, for example, fiber reinforced plastic (FRP), and has substantially the same length as the antenna units 21a, 21b,... Are bent at the same angle as the protective cover 24 of the antenna units 21a, 21b,. Further, the gap cover 41 has upper and lower bent end portions 42a, 42b bent vertically at a predetermined width to form mounting portions 40a, 40b, and a plurality of mounting portions 40a, 40b, in this example, four bolt holes. 43 is provided. This bolt hole 43 is provided at a position corresponding to the bolt hole 27a provided in the reflection plate 22 of the antenna units 21a, 21b,. The mounting portions 40a and 40b are mounted on the protective cover 24 of the antenna units 21a, 21b,..., And are formed in a mountain shape at a predetermined angle so that their mounting surfaces coincide.

  Further, the gap cover 41 is formed so that the surface in the width direction is substantially the same arc shape as the protective cover 24, and the lateral width is set so that both side portions overlap the stepped portion 31 of the protective cover 24.

  Further, at the inner center of the gap cover 41, as shown in FIGS. 1 (b), 3 (b), and 3 (c), a mounting plate formed of, for example, an aluminum plate having a thickness of about 3 mm along the longitudinal direction. 44 is fixed by an adhesive. The mounting plate 44 is provided with support portions 46a and 46b at a plurality of locations, for example, two locations at the top and bottom of the elongated mounting base 45, and the tips of the support portions 46a and 46b are located at the inner center of the gap cover 41. It is fixed with an adhesive. Further, both sides of the fixing portion are reinforced by reinforcing members 47a and 47b having a triangular cross-sectional shape. The reinforcing members 47a and 47b firmly fix the inner center of the gap cover 41 and the support portions 46a and 46b with an adhesive.

  The mounting plate 44 is provided such that a side portion of the mounting base 45 opposite to the gap cover 41 protrudes further outward from the bent ends 42a and 42b of the gap cover 41, and the antenna unit 21a is mounted when mounted. , 21b,... Are set so as to be positioned between the bent portions 35. The mounting base 45 is formed with, for example, a semicircular mounting guide 48 so as to protrude outward from the central portion, and a guide hole 49 is provided at the center thereof. Further, the mounting base 45 is provided with a plurality of bolt holes 51 at predetermined intervals along the longitudinal direction. The position of this bolt hole 51 is set corresponding to the bolt hole 27 provided in the reflecting plate 22 of the antenna units 21a, 21b,.

  Next, a procedure for mounting the antenna units 21a, 21b,... And the gap cover 41 will be described. As shown in FIGS. 1 (a) and 1 (b), the plurality of antenna units 21a, 21b,... Are installed at equal intervals around the vicinity of the upper portion of the tower using a support mechanism (not shown). In this case, each antenna unit 21a, 21b,... Sets the interval between the bent portions 35 provided on the reflecting plate 22 in accordance with the thickness of the mounting plate 44 provided on the gap cover 41. The antenna units 21a, 21b,... Are attached to the steel tower using, for example, a crane.

  In the antenna units 21a, 21b,..., The protective cover 24 is attached in advance to the reflection plate 22, but the bolts and nuts 29a are removed from the upper and lower side portions, that is, the portion to which the gap cover 41 is attached. In this state, the gap cover 41 is positioned between the antenna units 21a, 21b,..., And the mounting base 45 of the mounting plate 44 is between the bent portions 35 provided on the reflecting plate 22 of the antenna units 21a, 21b,. Insert into. At this time, both side portions of the gap cover 41 are positioned so as to overlap the stepped portion 31 of the protective cover 24, but packing is provided between the gap cover 41 and the stepped portion 31 of the protective cover 24 as shown in FIG. 55 is interposed.

  When mounting the gap cover 41, the gap cover 41 can be easily positioned at a predetermined position by pulling the mounting plate 44 toward the center of the tower using the mounting guide 48 provided on the mounting base 45. Can do.

  Then, the bolt holes 43 provided in the mounting portions 40a and 40b at the upper and lower end portions of the gap cover 41 and the bolt holes provided in the upper and lower side portions of the edge portion 28 of the protective cover 24 are made to coincide with each other. And the nut 29a is inserted and fixed, the reflectors 22, the protective cover 24, and the gap cover 41 of the antenna units 21a, 21b,. In this case, a packing 56 is interposed between the edge portion 28 of the protective cover 24 and the gap cover 41 as shown in FIG.

  Further, the bolt holes 51 of the mounting base 45 inserted between the bent portions 35 of the adjacent reflectors 22 are matched with the bolt holes of the bent portions 35, and the bolts and nuts 57 are attached as shown in FIG. Insert and fix both. At this time, both side portions of the gap cover 41, that is, portions overlapping the reflector plate 22 of the antenna units 21a, 21b,... Are located in the stepped portion 31 provided on the reflector plate 22. The surface of becomes flat.

  As described above, by attaching the gap cover 41 between the antenna units 21a, 21b,..., The gaps between the antenna units 21a, 21b,. Can be reliably prevented.

  Since the mounting guide 48 is provided on the mounting base 45 of the mounting plate 44, the clearance cover 41 can be easily moved to a predetermined position by using the mounting guide 48 to pull the mounting plate 44 toward the center of the steel tower. It can be positioned and the mounting operation can be performed quickly.

  FIG. 4 shows an example in which a multi-plane synthetic antenna having a gap cover 41 provided between the antenna units 21a, 21b,... As shown in the above embodiment is arranged in four stages. Is a top view, and (b) is a front view.

  As shown in FIGS. 4A and 4B, four-stage multi-surface synthetic antennas 63 a to 63 d are arranged around a steel tower 61 via a support mechanism 62 at a predetermined interval. In FIG. 4, as the multi-surface synthetic antennas 63a to 63d in each stage, 16 antenna units 21a, 21b,... Are arranged at substantially equal intervals, and gap covers 41a, 41b are provided between the antenna units 21a, 21b,. ,... Are provided. The antenna units 21a, 21b,... Are composed of, for example, two systems, and a first system unit and a second system unit are alternately arranged.

  As described above, by providing the gap covers 41a, 41b,... Between the antenna units 21a, 21b,..., The outer peripheral surfaces of the multi-sided synthetic antennas 63a to 63d can be formed in a circular shape, and the antenna units 21a, 21b. ..., it is possible to reliably prevent snowfall by eliminating the gap between them.

  Further, since the gap covers 41a, 41b,... Are configured to be detachable from the antenna units 21a, 21b,..., The multi-surface synthetic antennas 63a, 63b,. Even when configured, the gap covers 41a, 41b,... Can be attached and detached individually for each stage of the multi-plane synthetic antennas 63a, 63b,..., And maintenance of the antenna units 21a, 21b,. Inspection and the like can be easily performed. That is, the multi-surface synthetic antennas 63a, 63b,... At each stage individually attach / detach the gap covers 41a, 41b,... And the protective cover 24 of each antenna unit 21a, 21b,. The antenna units 21a, 21b,... Can be quickly maintained and inspected.

  In the above-described embodiment, an aluminum plate is used as the mounting plate 44. However, the mounting plate 44 is not limited to the aluminum plate, and may be formed using other metal plates or the same fiber reinforced plastic (FRP) as the gap cover 41. May be.

  In the above-described embodiment, a case where a two-row 6L twin-loop antenna in which six loop elements are arranged in two rows is used as the antenna units 21a, 21b,... Even when a loop antenna (connected with two loop elements) or a 4L dual loop antenna (connected with four loop elements) is used, or when the number of columns is set to another value, the above-described implementation is performed. It is possible to mount the gap covers 41a, 41b,.

  Further, in the above embodiment, the case where a loop element is used as the radiating element of the antenna units 21a, 21b,... Is shown, but other cases where a dipole antenna element is used are the same as in the above embodiment. The gap covers 41a, 41b,... Can be mounted.

  Moreover, in the said embodiment, although shown about the case where a polyhedral synthetic | combination antenna is installed in a steel tower, it can implement also when installing an antenna in support | pillars, such as a concrete pillar, for example.

The state which arrange | positioned the polyhedral synthetic | combination antenna and clearance gap cover which concern on one Embodiment of this invention around the steel tower was shown, (a) is a top view, (b) is a figure which expands and shows the principal part. In the same embodiment, the details of the antenna unit portion constituting the multi-surface synthetic antenna are shown, (a) is a front view showing a section, (b) is a side view, (c) is a bottom view. is there. In the embodiment, details of the gap cover portion are shown, in which (a) is a front view, (b) is a sectional view, and (c) is a top view. In the embodiment, an example in which a multi-surface synthetic antenna is arranged in four stages is shown, in which (a) is a top view and (b) is a front view. It is a top view which shows the principal part of the conventional polyhedral synthetic | combination antenna.

Explanation of symbols

  21a, 21b ... antenna unit, 22 ... reflector, 23a, 23b ... loop element, 24 ... protective cover, 26 ... edge part, 27 ... bolt hole, 28 ... edge part, 29 ... bolt and nut, 31 ... step part, 32a, 32b ... feed section, 33a, 33b ... feed path, 34 ... feed end, 35 ... bending section, 40a, 40b ... mounting section, 41, 41a, 41b ..., multi-surface synthetic antenna gap cover, 42a, 42b ... Folded end part, 43 ... Bolt hole, 44 ... Mounting plate, 45 ... Mounting base part, 46a, 46b ... Support part, 47a, 47b ... Reinforcing material, 48 ... Mounting guide, 49 ... Guide hole, 51 ... Bolt hole, 55, 56 ... packing, 57 ... bolts and nuts, 61 ... steel tower, 62 ... support mechanism, 63a to 63d ... multi-surface synthetic antenna.

Claims (2)

In a multi-surface synthetic antenna in which a plurality of antenna units covered by a protective cover whose upper surface in the width direction is formed in an arc shape are arranged in a multi-surface at a predetermined interval.
Provided so as to cover the gap between the antenna units, the widthwise surface is formed in substantially the same arc shape as the protective cover, and both ends of the upper and lower end portions together with the protective cover of the antenna unit of the antenna unit A gap cover for a multi-sided synthetic antenna, characterized by being attached. In a cover for a multi-sided synthetic antenna that covers a multi-sided synthetic antenna in which a plurality of antenna units are arranged in multiple sides at a predetermined interval,
A protective cover for the antenna unit, which is provided so as to cover each antenna unit, and has a stepped portion in which the upper surface in the width direction is formed in an arc shape and both side portions are formed lower by a predetermined length,
Provided to cover the gaps between the antenna units, the widthwise surface is formed in the same arc shape as the protective cover, and the lateral width is set so that both sides overlap the stepped portion of the protective cover A gap cover,
The cover for a multi-sided synthetic antenna, wherein the protective cover is set so that an outer surface is substantially flush with the gap cover in a state combined with the gap cover.

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