JPH04240902A - Radome mount structure in parabolic antenna - Google Patents

Abstract

PURPOSE:To realize the mechanism able to mount/dismount a radome to an antenna main body quickly with a simple structure with respect to the structure to mount the radome to the parabolic antenna used for in-city millimeter wave communication system. CONSTITUTION:The mount member is consisted of engagement holes 13 provided to a skirt 12 at the outer circumference of a radome 10 at an equal angular position and a flexible spring member 15 having an engagement section 14 corresponding to each engagement hole 13. After the skirt 12 of the radome 10 is covered along the circumferential ridge of an antenna main body 11, the engagement section 14 of the spring member 15 is fitted to the projection hole 13 projected to a rear side of the antenna main body 11 in the radial direction from the inner side of the skirt 12 and the position is fixed by an elastic force of the spring member.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a radome to a parabolic antenna used in an urban millimeter wave communication system.

0002

[Prior Art] A small-diameter, axisymmetric parabolic antenna whose antenna axis is oriented almost horizontally is often used for outdoor mobile communications, etc., and can be quickly assembled and disassembled at the communications site. It is necessary that Conventionally, in this type of antenna, in order to attach the radome to the antenna body, as shown in FIG. Position. As shown in FIG. 9, the mounting bracket 3 is placed in alignment with the holes 6 provided at multiple angle positions (for example, three locations) in the skirt portion 2a protruding from the back side of the antenna body 1, and the mounting bracket 3 is inserted through the hole. A screw 4 is screwed into a screw hole 5 of the mounting fitting 3 to fix it.

0003

[Problems to be Solved by the Invention] However, this method required tightening a total of six screws, two at each location, and required a considerable amount of work time. Additionally, there was a risk of falling metal fittings and screws during work. Moreover, there is a high possibility that these metal fittings and screws will be lost while disassembled and stored, and countermeasures are required.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems in the prior art and to provide a mechanism that allows a radome to be quickly attached to and detached from an antenna body with a simple structure.

[0005]

[Means for solving the problem] This purpose is to provide engagement holes provided at equal angular positions in the skirt portion of the outer periphery of the radome;
and one flexible spring member having engaging portions corresponding to the respective engaging holes, and after the skirt portion of the radome is placed along the periphery of the antenna body, the rear side of the antenna body is A radome mounting structure for a parabolic antenna, characterized in that the engaging portion of the spring member is fitted into the engaging hole protruding from the skirt portion in a radial direction from the inside of the skirt portion, and the position is fixed by the elastic force of the spring member. achieved.

[0006]

[Operation] To attach the radome, the skirt portion is placed over the front side of the antenna body along its periphery, and the skirt portion is made to protrude to the back side of the antenna body. Then, the spring member is bent in a direction that reduces the radius of curvature, and is inserted from the back side of the skirt portion, the engagement portion is engaged with the engagement hole, and the deflection force is released. The spring member then exerts a biasing force on the radome in an attempt to return to its original radius, pressing the radome against the back surface of the antenna body and holding it in that position.

Below, based on the preferred embodiment shown in the drawings,
The present invention will be explained in more detail.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall structure of a first embodiment of the present invention. The radome 10 is provided with a skirt portion 12 at its periphery so as to cover the outer periphery of the circular antenna body 11. A plurality of (three in the illustrated example) long holes 13 are bored in the skirt portion 12 as engagement holes at equal angular positions along the circumference.

On the other hand, a spring member 15 made of a rigid and flexible metal wire and having an engaging portion 14 projecting outward at a location corresponding to the long hole 13 is prepared. As shown in FIG.
3, and a stepped portion 14b having a width wider than the elongated hole 13 following the tip portion 14a. The region between adjacent engaging portions 14 is curved in accordance with the back surface of the antenna main body 10, which has a convex surface.

[0010] The procedure for attaching the radome with this structure will be explained. First, attach the radome 10 to the antenna body 11
As shown in FIG.
3 is positioned behind the curled portion 11a.

Next, the skirt portion 12 is bent slightly by hand to reduce the radius of curvature of the spring member 15.
and insert each engaging portion 14 into the corresponding elongated hole 13.
, and its tip 14 a is engaged with the elongated hole 13 . When the force that was deflecting the spring member 15 is removed, the spring member 1
5 is urged to expand to its original radius by its own elastic restoring force and is self-held in that position. The stepped portion 14b contacts the curled portion 11a of the antenna main body 11 and supports it from behind. This allows the radome to be stably positioned at a predetermined position. This is shown in FIG.

FIG. 4 shows a second embodiment of the invention. In this example as well, a spring member 15 having three engaging parts 14 is used, but the pivot support 1 corresponding to the engaging part 14 in the center position
4' is a holding plate 17 having a shape as shown in FIG.
Although axial rotation is possible with respect to the skirt portion 12 of the radome 10, its position is maintained so as not to move.

Even when the radome 10 is removed from the antenna main body 11, this spring member 15 is attached to the pivot support 14.
' Since it is integrated with the radome 10, there is no possibility of losing it. The method of attachment to the antenna body 11 is substantially the same as in the first embodiment, and is carried out by engaging the two engaging portions 14 on both sides with the corresponding elongated holes 13 of the skirt portion 12 of the radome. be exposed.

FIG. 6 shows a modification in which the present invention is applied to an antenna main body 11 whose edges are left cut and no curled portion 11a is formed. As shown in (b), the position of the long hole 13 of the radome is provided on the deeper side of the skirt portion 12 compared to the above-mentioned example, and the step portion 14 of the spring member
b can come into direct contact with the back surface of the antenna body 10.

As shown in (a), the central pivot support 14' of the spring member is also curved at a steep angle toward the back side of the antenna main body, so as to be in direct contact with this. Note that in the above example, the tip portion 14a and the stepped portion 14b of the engaging portion 14 of the spring member are formed in a stepped shape;
In order to facilitate manufacturing, it is also possible to form it into a gently tapered shape as shown in FIGS. 7(a) and 7(b).

In the case of the shape of the engaging portion shown in FIG. 7(b), it is also possible to make the engaging hole 13 of the radome 10 circular.

[0017]

[Effects of the Invention] According to the present invention, a single spring member can be inserted into the engagement hole of the radome without using screws, whereas the radome was conventionally fixed to the antenna body by screws at multiple locations. By engaging and positioning and holding by the elastic force of the spring member, assembly time and man-hours can be significantly reduced. Furthermore, even when the radome is removed from the antenna body, it is possible to always keep the spring member attached, which eliminates any accidents such as loss of the spring member that hinder work at the assembly site.

[Brief explanation of the drawing]

FIG. 1 is (a) a rear view and (b) a side view showing the overall configuration of a first embodiment of the present invention.

FIG. 2 is a detailed view of the engaging portion of the spring member in the first embodiment.

FIG. 3 is an enlarged side cross-sectional view of an engagement location showing the positional relationship between the assembled radome and antenna main body in the first embodiment.

FIG. 4 is (a) a rear view and (b) a side view showing the overall configuration of a second embodiment of the present invention.

FIG. 5 is a perspective view showing details of the shaft support of the second embodiment.

FIG. 6 is (a) a side sectional view of a shaft support and (b) a side sectional view of a locking location in a third embodiment of the present invention.

FIGS. 7(a) and 7(b) are plan views showing another shape of the engaging portion of the spring member.

FIG. 8 shows the overall configuration of a conventional radome mounting structure (
a) Rear view and (b) side view.

FIG. 9 is a side sectional view showing details of the attachment portion.

[Explanation of symbols]

10...Radome 11...Antenna body 11a...Curl part 12...Skirt part 13...Long hole, engagement hole 14...Engagement part 14’…Axis support 14a...Tip part 14b...Stepped portion 15...Spring member 16...Gasket 17...Press plate

Claims (3)

[Claims] 1. Engagement holes (13) provided at equal angular positions in the skirt portion (12) on the outer periphery of the radome (10);
and a flexible spring member (15) having engaging portions (14) corresponding to the respective engaging holes (13), and the skirt portion (12) of the radome (10) is connected to the antenna. After covering the main body (11) along the periphery, the engagement part (14) of the spring member (15) is inserted into the long hole (13) protruding from the back side of the antenna main body (11).
2) A radome mounting structure for a parabolic antenna, characterized in that the radome is inserted into the antenna from the inside in a radial direction and its position is fixed by the elastic force of a spring member. 2. The engaging portion (14) of the spring member (15)
2. Structure according to claim 1, characterized in that one of the radomes (14') constitutes a pivot support (14') fixed in position on the skirt (12) of the radome (10). 3. The engaging portion (14) is connected to the engaging hole (
3) The structure according to claim 1 or 2, comprising a tip portion (14a) having a narrower width than the tip portion (14a) and a step portion (14b) having a wider width following the tip portion (14a).