JPH036018Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to an umbrella-shaped antenna for long waves or very long waves.

b.Prior art Figure 6 shows a conventional umbrella-shaped antenna for long waves or very long _waves . This is a more insulated steel tower. Usually, this steel tower T consists of multiple branch lines (not shown) into which an appropriate number of insulators I are inserted.
The branch wires are supported vertically at the antenna and are constructed so that they do not affect the operation of the antenna.

On the other hand, from the top P of the steel tower T, a large number of umbrella wires (conducting wires) K are strung radially diagonally downward. Insulators I are attached to the lower ends of all these umbrella lines K.
are arranged respectively, and an umbrella wire K is connected through this insulator I.
It is held back to the earth by another pedestal line K' which is an extension of .

FIG. 7 is a plan view of the conventional umbrella-shaped antenna shown in FIG. 6, viewed from directly above. As is clear from Fig. 7, the umbrella line K and the mounting line K' are stretched radially around the steel tower T, and are equidistant on the circumference of the steel tower T with a radius approximately the same as the height of the steel tower T. It is held in place by anchors A placed at angular intervals.

Although electrically this antenna has drawbacks such as a relatively small capacitance and a small effective height compared to the height of the steel tower T, mechanically it has a convenient structure. ing. That is, when constructing the antenna, the umbrella wires K can be hoisted up one by one, and once all the umbrella wires K have been stretched, a well-balanced and strong structure will be created.

c. Problems to be solved by the invention However, this type of conventional umbrella-shaped antenna had a major drawback in that it required a large number of anchors A.

In our country, it is difficult to obtain large, flat land, and the reality is that it is extremely difficult to secure a site for antennas. Even if there is a large site, some of the many anchors A may collide with roads or waterways. Moreover, even when cultivating under the antenna, the large number of anchors A becomes an obstacle. Moreover, although one anchor A may be small, the more anchors A there are, the higher the construction cost of the antenna will be. In particular, when it is necessary to increase the number of umbrella wires K in order to increase the capacitance of the antenna, the above drawbacks are difficult to avoid.

The present invention was made to alleviate the above-mentioned drawbacks, and its purpose is to reduce the number of anchors for a predetermined number of umbrella wires without deteriorating the function. The purpose of the present invention is to provide an umbrella-shaped antenna for use.

d Measures to solve the problem As shown in Figure 8, a skirt line S is connected between the lower ends of every other adjacent umbrella line K, and a skirt line S is placed between these two umbrella lines K. By connecting the lower end of the umbrella line K to the midpoint M of the hem line S and omitting the anchor corresponding to this umbrella line
This is advantageous because the number of insulators I can be halved, and the number of insulators I can also be halved. However, with this structure, it is necessary to assemble the umbrella line K either by pulling the umbrella line K up to the tower T after assembling the entire antenna, or by performing a hovering operation in the air. in addition,
The disadvantage is that if a failure occurs in any one part, the antenna will completely lose its functionality.

Therefore, in the present invention, n (however: n≧2
(a ) a steel tower T; (b) anchors A each disposed at N/n equally divided locations on a circumference centered on the base of the steel tower T and having a radius approximately the same as the height of the steel tower; (c) It is pulled down from the top P of the steel tower T and extends into each sector of N/n virtual triangles formed in space by the top P of the steel tower T and two mutually adjacent anchors A. n umbrella lines K
(d) a mounting line K' that holds the lower end of the umbrella line K arranged at both ends of each sector to the anchor A via an insulator I; and (e) an umbrella arranged at both ends of each sector. A hem line S extending over the lower end surface of the line K and to which the lower ends of the n umbrella lines are connected is provided, and the angle α between the adjacent umbrella lines K is provided.
The umbrella wire K is connected to the tower T so that the angle is 360°/N.
The umbrella wires K are pulled down from the top P and connected to the skirt line S, thereby extending the N umbrella wires K at equal angular intervals around the steel tower T.

In a more preferred embodiment of the present invention, the circumference on the ground surface centered on the steel tower T is defined as the umbrella line K.
Anchors A are arranged at points that are divided by the number N divided by n (where n is an integer greater than or equal to 2). Then, a partial sector of the umbrella-shaped antenna consisting of a plurality of umbrella wires K is stretched within a sector (triangular area) formed by two adjacent anchors A and the top P of the steel tower T, and each sector The structure is such that the sectors are not related to each other, that is, any one sector can be erected or removed independently of the others.

The configuration of the umbrella-shaped antenna of the present invention will be specifically described below.

In an umbrella-shaped antenna consisting of a number of umbrella wires K that is an integral multiple of an integer n of 2 or more and corresponds to an integer N of 6 or more, extended diagonally downward from the top P of a base-insulated steel tower T, the tower T is the center. A circumference having a radius approximately the same as the height of the steel tower T is drawn on the ground surface, and the umbrella wire retaining anchors A are installed at points where this circumference is equally divided into N/n pieces. Next, the top P of the steel tower T
In each sector of M/n virtual triangles formed in space by two anchors A adjacent to each other, n umbrella lines K are drawn diagonally downward from the top P of the steel tower T, and a plane In the figure, the lower end of each umbrella line K is connected to a skirt line S extending straight or arched toward the steel tower T side so that the angle α between adjacent umbrella lines K is 360°/N. Then, it is connected to the lower end of the umbrella wire K which is disposed at both ends of each sector part and is held by the anchor A through the insulator I and the mounting wire K' in this order. At this time, the dimensions of each part of the mounting line K', the umbrella lines K on both sides, and the skirt line S extended between the lower ends of the umbrella lines K are set appropriately so that the forces are balanced. Therefore, as one sector unit of the above-mentioned umbrella-shaped antenna, M/n sectors are stretched around the steel tower T, and an umbrella consists of a total of N umbrella wires K extended at equal angular intervals. It is designed to form a shaped antenna.

The reason why the number N of umbrella wires is set to 6 or more is that the minimum limit is to set the number of sectors (the number of anchors A) to 3 and the number of umbrella wires in one sector to 2. This is because if there are only one or two, a circular object cannot be supported. Normally, N is 16~
This is because the capacitance is often around 30, and even if the number of umbrella wires K is increased beyond this, the increase in capacitance will reach saturation and become extremely small.

FIGS. 1, 2, and 3 show embodiments of the umbrella-shaped antenna of the present invention in the case where N=24 and n=2, 3, and 4, respectively. In each case, the configuration is shown in a plan view. Further, FIGS. 4 and 5 show the configurations within a unit sector in the case of n=3 and 4, respectively.

As shown in FIGS. 2 to 4, the anchoring lines K' of adjacent sectors are fastened to the same anchor A, but this anchor A is provided with separate hooks (not shown). Each of the mounting lines K′ of the book is held down separately. In this way, one sector of the umbrella wire K can be attached and detached independently of the others. Therefore, when constructing an umbrella-shaped antenna, the sector parts can be lifted up to the tower T one by one, which is very convenient for work.

Further, even if a failure occurs somewhere after the umbrella-shaped antenna is completed, it is only necessary to remove and repair the sector portion where the failure occurs, making the work extremely easy. Moreover, although there will be a slight decrease in efficiency during this repair period, the remaining sectors will function normally, so
Normal communication can be carried out without any problems.

On the other hand, if the number of umbrella wires K in one sector is increased, the number of anchors A can be reduced, but if the number of anchors A is increased too much, in the event of a failure, if the failed sector part is removed for repair, The umbrella-shaped antenna looks like it has a large missing tooth, and the disadvantage is that the antenna cannot be used during the repair period. Therefore, it is desirable to limit the number of n to 5 or less. Theoretically, if the number of umbrella wires K is increased significantly, n may also be 5 or more, but in this case, the antenna becomes heavier and the tower T is made to have a correspondingly stronger strength. You have to make something of it, and there are very few places where you can benefit from it.

e Effects of the invention As described above, the invention provides two or more umbrella wires of the tower T within each sector of the virtual triangle formed in space by the top P of the tower T and two adjacent anchors A. While pulling down from the top P, the lower ends of the umbrella wires K arranged at both ends of each sector are secured to the anchor A via the insulator I and the mounting wire K' in sequence,
Since the lower end of the umbrella line K is connected to the skirt line S extended between the lower ends of the umbrella lines K arranged at both ends of the sector, the number of anchors A can be omitted, and the number of antennas Not only can construction costs and maintenance costs be reduced, but it is also advantageous in terms of land use.

Moreover, since each sector part can be attached to the steel tower T separately and independently, the assembly work of the antenna becomes extremely easy and efficient. Furthermore, in the event that a failure occurs in any sector, that sector can be configured to be removable completely separately from the other sectors, making repair work easy and efficient. The antenna can still be used during this repair period.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment in which the present invention is applied to an umbrella antenna for ultra-long waves, and Figure 1 shows the case where n (number of umbrella wires in a unit sector) = 2. 2 is a plan view of the umbrella antenna when n=3, FIG. 3 is a plan view of the umbrella antenna when n=4, and FIG. 4 is a plan view of the umbrella antenna when n=3. FIG. 5 is a plan view showing the configuration of a unit sector in the case of n=4, and FIGS. 6 and 7 show a conventional umbrella-shaped antenna for ultra-long waves. 6 is a front view of the antenna, FIG. 7 is a plan view of the antenna, and FIG. 8 is a plan view of the umbrella-shaped antenna for explaining the present invention. T...steel tower, P...top, I...insulator, K...
Umbrella line, K'... pedestal line, A... anchor, S...
Hem line, α... angle, M... midpoint.

Claims (1)

[Scope of claim for utility model registration] Umbrella wires whose number is an integral multiple of n (where n≧2 is an integer) and corresponds to an integer N of 6 or more are drawn diagonally downward from the top of a base-insulated steel tower. (a) a steel tower T; (b) N/n on the circumference of a circle whose center is the base of said steel tower T and whose radius is approximately the same as the height of said steel tower. (c) Anchors A arranged in equal parts, respectively; n umbrella lines K extended within each sector of N/n virtual triangles
(d) a mounting line K' that holds the lower end of the umbrella line K arranged at both ends of each sector to the anchor A via the insulator 1; and (e) an umbrella arranged at both ends of each sector. A hem line S extending over the lower end surface of the line K and to which the lower ends of the n umbrella lines are connected is provided, and the angle α between the adjacent umbrella lines K is provided.
The umbrella wire K is connected to the tower T so that the angle is 360°/N.
A long wave or ultra-long wave characterized in that the N umbrella lines K are extended at equal angular intervals with the steel tower T at the center, and connected to the skirt line S. Umbrella-shaped antenna for use.