JPH05206721A - Antenna system - Google Patents

Abstract

PURPOSE:To obtain the small sized and portable antenna system by which a radio wave from a broadcast satellite is efficiently received by providing an antenna flair part freely expanded, a converter connected removably and an elevating angle adjustment mechanism for the converter to the system. CONSTITUTION:An antenna system main body 1 is turned and an elevating angle adjustment screw of a stand 6 is loosened to adjust the elevating angle thereby adjusting the azimuth angle and the elevating angle of the system 1. A radio wave from a broadcast satellite is made incident in an inner circumferential face 2 of an antenna flair part 3 and inputted to a polarizer in a converter 4. A phase of one linearly polarized wave component of the input radio wave is shifted by 90 deg. in the polarizer to convert the radio wave into a linearly polarized wave, the wave is subject to signal processing and the result is outputted from a plug 13 and sent to a BS tuner through a connection cable. The flair part 3, the converter 4 and the stand 6 are respectively formed removably and the flair part 3 is expanded in flat, then the system 1 is contained in a small space and the carrying of the system 1 is easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for receiving radio waves transmitted from broadcasting satellites.

[0002]

2. Description of the Related Art In satellite broadcasting, S transmitted from a broadcasting satellite is used.
Since HF radio waves are excellent in straight traveling, the refraction by the atmosphere is extremely small, and the influence of radio waves shielded by topography such as mountains and buildings is small, the equator across Japan, including difficult-to-view areas such as remote islands and mountainous areas. One broadcasting satellite at an altitude of 36000 km above the sky can cover the entire area. Further, the radio waves transmitted from the broadcasting satellite have a sharp directivity, for example, a parabolic antenna that receives the radio waves, and the elevation angle when the parabolic antenna is directed to the broadcasting satellite has a high elevation angle. Since the image is received with almost no influence of the reflection of radio waves by an object, a high-quality image can be obtained, and since the voice is received by the pulse code modulation method, it is possible to enjoy a good and powerful sound.

A broadcasting satellite receiving system includes a parabolic antenna for efficiently receiving radio waves from the broadcasting satellite,
A converter for converting radio waves from a broadcasting satellite, a connection cable and a connector for transmitting the radio waves converted by the converter, a tuner for selecting an output signal of the converter to extract a video signal and an audio signal, and the tuner. It is composed of an image receiver or the like that converts these signals extracted by to video and sound.

A broadcasting satellite receiving system having such a structure is installed on the ground, veranda, wall surface, roof, etc., with the parabolic surface of the parabolic antenna accurately aligned with the direction of arrival of radio waves, Radio waves from a broadcasting satellite incident on the parabolic antenna parabolic antenna are reflected by the parabolic antenna and efficiently input to a converter arranged at the focal point of the parabolic antenna. At this time, the radio wave input from the broadcasting satellite to the converter is a circularly polarized wave, so the circularly polarized wave is converted into a linearly polarized wave, and the 12 GHz band signal captured by the parabolic antenna is converted to 1 GHz.
The signal is converted into a z-band signal, transmitted to the BS tuner through a connection cable, and displayed on the screen of the image receiver.

In addition, in the satellite broadcasting receiving system, along with the increase in transmission power and the increase in the number of satellite broadcasting channels accompanying the higher output of broadcasting satellites, the antenna is downsized, the converter is reduced in noise, or a new broadcasting service is provided. With the start of (audio-only broadcasting service), it is fully conceivable to move toward personalization like the conventional terrestrial broadcasting receiving system.

[0006]

However, on the ground,
From BS antenna installed on balcony, wall surface, roof, etc. to BS converter, connection cable, connector, B
In the satellite broadcasting reception configuration that is displayed on the receiver via the S tuner, etc., the arrangement position of the receiver is almost determined by the installation position of the antenna for satellite broadcasting and the length of the connection cable. It is impossible to freely move and listen to the receiver when receiving a good audio-only broadcasting service.

Further, if it is necessary to provide terminals for satellite broadcasting and the like in each room in order to allow the arrangement position of the receiver to some extent, the cost burden for providing these facilities increases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an antenna device which is small and portable, and which efficiently receives radio waves from a broadcasting satellite.

[0009]

In an antenna device according to the present invention, an antenna flare portion formed so as to be expandable by a sheet-like member having a conductor layer on at least one surface, and the antenna flare portion are detachably connected. And a stand having an elevation angle adjusting mechanism for mounting the converter and rotating the converter in an elevation angle.

[0010]

With this configuration, the antenna device can easily make the tip side of the antenna flare part coincide with the arrival direction of the radio wave transmitted from the broadcasting satellite, and separate the antenna flare part, the converter and the stand from each other. You can

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 relate to a first embodiment of the present invention, FIG. 1 is a perspective view and a sectional view showing an antenna device, FIG. 2 is an exploded perspective view and a partially enlarged view showing a schematic configuration of the antenna device,
FIG. 3 is a development view of the antenna flare portion, FIG. 4 is a cross-sectional view illustrating the connection when assembling the antenna flare portion, and FIG. 5 is a schematic configuration diagram illustrating the connection between the antenna flare portion and the converter.

As shown in FIG. 2A, the antenna device 1
Is to connect the antenna flare portion 3 with an antenna flare portion 3 formed by assembling a resin sheet having a conductor layer such as aluminum formed on at least the surface serving as the inner peripheral surface portion 2 in a conical shape. A converter 4 having a polarizer (not shown) for converting a circularly polarized radio wave transmitted from a broadcasting satellite into a linearly polarized wave, and this converter 4
A stand 6 having an elevation adjustment mechanism 5 for adjusting the elevation angle of
Connection member 7 for connecting the converter 4 and the stand 6
It is composed of. Further, as shown in FIG. 2B, in the vicinity of both end surfaces of the antenna flare portion 3, a through hole which serves as a connecting portion for connecting and fixing when the resin sheet is assembled into a conical shape is formed. A plurality of portions 8a and a plurality of connected portions 8b each having a convex portion to be inserted into the connecting portion 8a formed on the side of the anti-conductor layer are provided. further,
As shown in FIG. 3, the antenna flare portion 3 can be developed on a fan-shaped plane, and a plurality of through holes 9 for joining with the converter 4 are provided in the vicinity of the arc on the center side of the fan-shaped plane. There is.

Assembly and connection of the antenna flare portion 3 will be described with reference to FIG. As shown in (a) and (b) of the drawing, the surface on which the conductor layer such as aluminum is formed is the inner peripheral surface portion 2.
By inserting the connected portion 8b of the antenna flare portion 3 into the through hole of the connecting portion 8a in such a manner that one end of the through hole of the connected portion 8a is caught by a part of the convex portion of the connecting portion 8b. As a result, the substantially flared antenna flare portion 3
Are formed. Then, again, when the antenna is flattened, the connected portion 8a to the connecting portion 8a
It can be easily deployed by removing b.

The connection between the antenna flare unit 3 and the converter 4 will be described with reference to FIG. As shown in (a) of the figure, the antenna flare portion 3 formed in a substantially conical shape and the joint portion 4a provided in the converter 4 are formed so that the inclination angles are substantially the same, and the antenna The connecting through hole 9 provided in the flare portion 3 and the through hole 10 of the converter 4 provided at a position corresponding to the connecting hole are aligned with each other so that the male screw 11 and the female screw 12 are screwed together to be joined. Is becoming

As shown in (b) and (c) of the figure, the antenna flare portion 3 has a substantially spherical protrusion 9 to be joined.
While a is provided, the antenna flare portion 3 and the converter 4 are provided by providing a joining portion 10a which is a through hole with a slit into which the spherical projection fits, at a position corresponding to the joined portion 9a.
It is also possible to join and.

Further, the converter 4 to which the antenna flare portion 3 is joined is connected to a stand 6 having an elevation angle adjusting mechanism 5 by a connecting member 7 such as a screw so that the elevation angle of the converter 4 can be freely rotated. It can be adjusted.

The operation of the antenna device 1 configured as described above will be described. After the antenna flare portion 4 developed in the form of a flat sheet is assembled into a conical shape and joined to the converter 4, the antenna device 1 in which the converter 4 is attached to the stand 6 rotates and moves the main body of the antenna device 1 as well as the stand. By loosening the elevation angle adjusting screw 7 of 6 and adjusting the elevation angle, the azimuth angle direction and the elevation angle direction of the antenna device 1 can be adjusted. Radio waves transmitted from a broadcasting satellite are incident on the inner peripheral surface 2 of the antenna flare portion of the antenna device 1 which faces the broadcasting satellite as described above. At this time, since the radio wave input to the polarizer (not shown) provided in the converter of the antenna device 1 is a circularly polarized wave that is a combination of two linearly polarized waves, the radio wave input in this polarizer is By shifting the phase of one of the linearly polarized wave components by 90 degrees, the linearly polarized wave component is converted into a linearly polarized wave, and a high frequency amplifier circuit, a local oscillator circuit, not shown, provided in the converter 4,
The signal is processed by a mixing circuit, an intermediate frequency amplifier circuit, etc., and output from the connector 13. The signal output from the plug 13 is transmitted to the BS tuner through a connection cable (not shown) and displayed on the receiver.

As described above, in the antenna device 1, the antenna flare portion 3, the converter 4 and the stand 6 are detachably constructed, and the antenna flare portion 3 is provided.
The antenna device 1 can be housed in a small space and can be easily carried and moved by allowing the antenna device 1 to be developed in a plane.

Further, the converter 6 is provided on the stand 6.
Since the elevation scale 5a indicating the elevation angle is provided, it can be used as a guide for setting the elevation angle when assembling the antenna device 1. It is also possible to use a tripod device for attaching a camera or the like instead of the stand 6.

Furthermore, since the antenna flare portion 3 can be processed by cutting out a plastic plate having a conductive layer, for example, it is inexpensive, and since it can be easily processed, the user himself / herself can incline the joint portion 4a. The antenna gain can be improved by changing the angle to adjust the opening area, or by making the shape of the antenna flare portion 3 not only a conical shape but also a quadrangular pyramid shape. The experimental result shows that a practical value of 26.5 dB is obtained when the diameter of the opening is 30 cm.

It is also possible to form the antenna flare portion 3 using a shape memory resin or the like.

Furthermore, the antenna flare portion 3 may be provided with a fold so that the antenna flare portion 3 can be easily folded into a small size.

FIG. 6 is an exploded perspective view showing a schematic structure of the antenna device 1 according to the second embodiment of the present invention. In contrast to the first embodiment for circularly polarized wave reception, this embodiment is different from the first embodiment in that
It is an antenna device 1a for receiving linearly polarized waves. The antenna device 1a of the present embodiment is provided with a polarization plane adjusting function for matching the polarization plane of the received linearly polarized wave with the polarization plane of the coaxial probe provided in the input section (not shown) in the converter 4. There is.

As shown in FIG. 6, in this embodiment, the converter 4 is provided with a polarization adjusting member 14 having a polarization plane adjusting function.
It is installed so as to be rotatable with respect to. Also,
The polarization adjusting member 14 is provided with a penetrating female screw portion 15 for connecting and fixing when the converter 4 is installed in the polarization adjusting member 14, and is provided on the outer peripheral side surface of the converter 4. The bottom of the groove 4b, which is located at a constant distance from the end face of the converter 4, is connected and fixed by pressing the tip of the male screw screwed into the penetrating female screw 15. The polarization adjusting member 14 is provided with a screw part for attaching the converter 4 and the stand 6 and a polarization plane tilt angle scale 16 for indicating a rotation angle of the polarization adjusting member 14. Other configurations are similar to those of the first embodiment, and the same reference numerals are used for the same members.

The operation of the antenna device 1a of the present embodiment constructed as described above will be described. The antenna device 1
a adjusts the azimuth angle direction and the elevation angle of the antenna device 1a to match the direction of the radio wave transmitted. Radio waves transmitted from a broadcasting satellite are incident on the inner peripheral surface 2 of the antenna flare portion of the antenna device 1 oriented as described above, and are input to the converter 4. At this time, the radio wave about to be input to the converter 4 has a polarization plane of a linearly polarized wave incident on the antenna device 1a and a polarization plane of a coaxial probe provided in an input section (not shown) in the converter 4 coincide with each other. Therefore, the male screw 17 connecting and fixing the converter 4 and the polarization adjusting member 14 is loosened, and the converter 4 provided in the polarization adjusting member 14 is inserted into the groove portion 4 of the converter 4.
The planes of polarization can be matched by rotating the male screw 17 located inside b as a guide.

By matching the polarization planes in this manner, the linearly polarized radio wave incident on the antenna device 1a is input to the converter 4 and a plurality of circuits (not shown) provided in the converter 4 are connected. After that, signal processing is performed, the signal is transmitted to the BS tuner through a connection cable (not shown), and is displayed on the receiver. Other functions and effects are similar to those of the first embodiment.

[0027]

As described above, according to the present invention, it is possible to be small and portable and to efficiently receive radio waves from a broadcasting satellite.

[Brief description of drawings]

1 to 5 relate to a first embodiment of the present invention, (a) of FIG. 1 is a perspective view showing a schematic configuration of an antenna device, and (b) is a schematic sectional view of the antenna device.

FIG. 2A is an exploded perspective view showing a schematic configuration of an antenna device. FIG. 2B is an enlarged view of a connected portion and a connecting portion of an antenna flare portion of portion A of FIG.

FIG. 3 is a development view of an antenna flare part.

FIG. 4 is a cross-sectional view illustrating a connection when assembling the antenna flare portion, (a) is an enlarged cross-sectional view before the connected portion and the connecting portion are connected, and (b) is a connected portion and the connecting portion. Enlarged sectional view when and are connected

FIG. 5A is a schematic view for explaining the connection between the antenna flare portion and the converter, and FIGS. 5B and 5C are connection examples showing another connection method between the antenna flare portion and the converter. Is a schematic explanatory view illustrating another connection example of the antenna flare portion. (C) is a schematic explanatory view illustrating another connection example of the converter.

FIG. 6 is an exploded perspective view showing a schematic configuration of an antenna device according to a second embodiment of the invention.

[Explanation of symbols]

1 ... Antenna device, 3 ... Antenna flare part, 4 ...
Converter, 6 ... Stand

Claims (2)

[Claims] 1. An antenna flare portion formed of a sheet-shaped member having a conductor layer on at least one surface, a converter to which the antenna flare portion is detachably connected, and a stand to which the converter is attached. An antenna device characterized by the above. 2. The sheet-like member forming the antenna flare portion is capable of being developed in a plane.
The antenna device described.