JPH01254009A - Reflection type antenna system - Google Patents

Abstract

PURPOSE:To improve the handling, to make the size of installation structure small and to improve the weather-resistance and the performance of natural lighting by installing lots of reflecting faces to nearly one plane of a reflection dish and selecting the installation attitude of each reflecting plane so as to concentrate the reflection radio wave by each reflecting face onto a focus. CONSTITUTION:Lots of reflecting faces 17A, 17B... are installed onto nearly one plane of a reflection dish 15 and the installation attitude of the reflecting faces 17A, 17B... are is set so that reflecting faces 17A, 17B... are concentrated onto an antenna 16 placed on the focus. That is, the received radio wave is reflected in lots of the reflecting faces 17A, 17B... of reflection dish 15 and concentrated onto the antenna 16 placed at the focus. Since the lots of reflecting faces 17A, 17B... constituting the reflection dish 15 are installed nearly on one plane, the reflection dish 15 is formed nearly to be flat and the reflection dish 15 is made thin and compact. Thus, the handling is improved, the size of installed structure is made small and the weather-resistance and the performance of natural lighting are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reflective antenna device suitable for receiving satellite broadcasting and the like.

[Prior Art] Conventionally, an antenna device as described in Japanese Utility Model Application Laid-open No. 179808 has been used as an antenna device for receiving satellite broadcasts and the like.

This antenna device has an antenna placed at the focal point of a parabolic reflecting dish, so that radio waves received from one direction are reflected by the parabolic surface of the reflecting dish and are all concentrated on the antenna at the focal point. It is.

[Problems to be Solved by the Invention] However, the conventional antenna device described above has the following problems.

(i) Since the reflective dish forms a paraboloid, it is large and thick, and the packaging is bulky when transported from the manufacturer to the user, making it difficult to handle.

■Since the reflective dish is large as mentioned in -L, the turret must also be large, and the FQ installation structure for the building must also be large.

(b) Since the reflective dish is large as mentioned above, it is installed so as to protrude greatly from the outside of the building, spoiling the appearance of the building and being susceptible to the adverse effects of wind, rain, and snow.

■As mentioned above, the reflective dish is large and installed around the building, so it blocks the window surface of the building, impairing visibility and daylighting.

SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna device that is easy to handle during transportation, has a compact installation structure in a building, does not spoil the appearance of the building, and has excellent weather resistance.

Another object of the present invention is to provide an antenna device that can improve the visibility and lighting of a building.

[Means for Solving the Problems] The present invention provides a reflective antenna device configured by arranging an antenna at the focal point of a reflective dish, in which the reflective dish has a large number of reflective surfaces disposed substantially on one plane, and The installation posture of each reflecting surface is set so that the radio waves reflected by the surface are concentrated at the focal point.

Further, the reflective dish is formed of a metal mesh.

[Function] In the reflective antenna device of the present invention, the received radio waves are
It is reflected by the many reflective surfaces of the reflective dish and is all concentrated on the antenna at the focal point. Therefore, according to the present invention, there are the following effects.

(2) Since the large number of reflective surfaces constituting the reflective dish are installed approximately on a flat surface, the reflective dish is approximately on a flat plate.

Therefore, the single reflective dish becomes thin and compact, and the packaging volume becomes small, resulting in good handling during transportation.

■As the reflective date is compact as mentioned above,
The weight is also small, and the structure for installing it in a building is also compact.

(3) Since the reflective dish is compact as mentioned above, it does not need to be installed in a large protruding manner on the outside of the building.
It does not damage the appearance of the building and has good weather resistance. In addition,
Reflective dishes can be easily installed in a retracted state by being embedded in roofs, exterior walls, windows, etc.

(Since the 10-reflection dish is compact as mentioned above, the possibility of blocking the window surface of the building is reduced, and the visibility and lighting of the building can be improved.

(2) When the reflective date is made of a metal mesh, in addition to being compact as described in -1- above, it is also translucent, so that visibility and lighting of the building can be effectively ensured.

[Example] Fig. 1 is a sectional view showing a first embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a plan view showing a second embodiment of the invention, and Fig. 4. FIG. 5 is a plan view showing a third embodiment of the present invention, and FIG. 5 is a sectional view showing a building in which the antenna device of the present invention is installed.

As shown in FIG. 5, the building 1O has a skylight 12 on the roof 11, and a reflective antenna device 13 is installed inside the skylight 12. 13A is the mounting bracket 1 13B is the roof 11
Or it is the structure of the skylight 12. Note that the window glass 14 of the skylight 12 is made of a material with good radio wave transparency.

As shown in FIGS. 1 and 2, the reflective antenna device 13 has an antenna (converter) at the focal point of one reflective dish 15.
It is constructed by arranging 16.

The reflective dish 15 has a large number of mutually step-shaped reflective surfaces 17A, 17B, and 17C installed on a substantially flat surface, and the reflected radio waves from each of the reflective surfaces 17A, 17B, 17C, etc. are provided at the focal point. The installation posture of each of the reflecting surfaces 17A, 17B, 17c, . . . is set so that the reflected light is concentrated on the antenna 16.

In this embodiment, the central reflecting surface 17A is a disc-shaped paraboloid, the surrounding reflecting surfaces 17B of the bipedal reflector 17A,
17C... consists of a ring-shaped paraboloid.

Next, the operation of the above embodiment will be explained.

In the above-mentioned reflective antenna device 13, received radio waves from a stationary satellite are transmitted to a large number of reflective surfaces 17A, 17B, 17c, . . . of a reflective dish 15 installed inside the skylight 12.
and all of it is concentrated on the antenna 16 at the focal point. According to the above embodiment, the following effects can be obtained.

■Multiple reflective surfaces 17A forming the reflective dish 15,
Since 17B, 17c, . . . are installed substantially on a plane], the reflective dish 15 has a substantially flat plate shape. Therefore, the reflective dish 15 becomes thin and compact, and the packaging volume becomes small, resulting in good handling during transportation.

(2) Since the reflective dish 15 is as compact as -ha, its weight is reduced by 1 unit, and the installation structure in the building IO is also compact.

(2) Since the reflective dish 15 is compact as described above, it is not installed in a large protruding manner to the outside of the building 10, so that the appearance of the building 10 is not impaired and the weather resistance is good. In addition to being stored in the skylight 12 as described above, the reflective dish 15 can also be easily installed on the roof 11. It can be installed in a retracted state by being embedded in an external wall, window, etc.

<Since the Φ reflective dish 15 is compact as described above, the possibility of blocking the daylighting area of the skylight 12 is reduced,
Lighting can be improved.

The reflective antenna device 20 shown in FIG. 3 is an example in which a reflective dish 22 is constructed of reflective surfaces 21A, 21B, 21C, . . . each having a large number of rectangular planes. Each reflective surface 21A, 21B, 2 constituting this reflective dish 22
1C... also represents each reflective surface 17A, 17B shown in FIG.
, 17c . . . are adjacent to each other in a step-like shape similar to that in .

The reflective antenna device 30 shown in FIG. 4 is an example in which a reflective dish 32 including a large number of reflective surfaces 31A, 31B, 31C, . . . is formed of a metal mesh. 33 is a metal wire. Each of the three constituting this reflective dish 32
1A, 31B, 31C, . . . are also adjacent to each other in substantially the same step shape as in each of the reflecting surfaces 17A, 17B, 17c, . . . shown in FIG. At this time, it is preferable that the size of the hole in the mesh is set smaller than 178 (approximately 3 - 0) of the wavelength of the broadcast radio wave (approximately 2.5 cm).According to this reflective antenna device 30, one reflective dish 32 Since it is made of metal mesh, it is not only compact like the above-mentioned reflective antenna device 13, but also has translucency, so that visibility and lighting of the building 10 can be effectively ensured.

[Effects of the Invention] As described above, according to the present invention, it is possible to improve handling during transportation, reduce the size of the structure installed in a building, and also achieve excellent weather resistance without impairing the appearance of the building. An antenna device can be obtained.

Further, according to the present invention, visibility and lighting of the building can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a plan view showing a second embodiment of the invention, and FIG. FIG. 5 is a plan view showing the third embodiment, and a sectional view showing a building in which the antenna device of the present invention is installed. 13.20.30... Reflective antenna device, 15.2
2.32...Reflection dish, 16...Antenna. 17A, 17B, 17c, 2LA, 21B. 21C131A, 31B, 31C... Reflective surface. Patent applicant Sekisui Chemical Co., Ltd. Representative Hiroshi 1) Kaoru Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) In a reflective antenna device configured by arranging an antenna at the focal point of a reflective dish, the reflective dish has a number of reflective surfaces installed approximately on one plane, and the radio waves reflected by each reflective surface are concentrated at the focal point. A reflective antenna device characterized in that the installation posture of each of these reflecting surfaces is set as follows. (2) The reflective antenna device according to claim 1, wherein the reflective dish is formed of a metal mesh.