JP2011151450A - Radio equipment - Google Patents

Abstract

An antenna having a waveguide input / output is simply attached to a housing.
An antenna includes a connecting portion having a cylindrical shape, and a housing includes a support portion having a cylindrical concave portion that matches the shape of the connecting portion, and a center of the connecting portion having a cylindrical shape. A circular waveguide 242 is formed along the axis, and the circular opening of the circular-rectangular waveguide converter 12 disposed inside the housing 10 is exposed at the center of the bottom surface of the cylindrical recess. Thereby, the antenna 20 can be easily attached to the housing 10 simply by fitting the connection portion 24 into the recess of the support portion 13.
[Selection] Figure 1

Description

  The present invention relates to a technique for connecting an antenna to a casing.

  With the spread of digital TV broadcasting, there is an increasing demand for a wireless system capable of transmitting an uncompressed high-definition signal at a TV station program production site. The inventors have developed a large-capacity radio technology using millimeter waves in order to meet the demand for a large-capacity radio link.

  In a relay program of a TV station, there is a demand for shortening the time from the arrival at the site until the relay becomes possible as much as possible. However, in conventional millimeter-wave radios, it is necessary to attach an antenna to the head unit that generates radio signals, open the head unit housing, and attach a module to the antenna. could not. This is because the size of the waveguide for transmitting the millimeter wave signal is very small, 2 mm × 1 mm, and thus strict accuracy is required for the connection of the signal transmission unit.

  Therefore, as shown in FIG. 5, a bayonet mechanism is introduced to connect the head portion and the antenna, and the antenna can be attached more easily than in the past (see Non-Patent Document 1).

  The antenna connecting portion shown in FIG. 5 is divided into a head portion and an antenna, and rectangular waveguides 101 and 201 are formed in the connecting portion 100 of the head portion and the connecting portion 200 of the antenna, respectively. In order to accurately connect the rectangular waveguides 101 and 201, an alignment hole 102 is disposed in the connection portion 100 of the head portion, and an alignment pin 202 is disposed in the connection portion 200 of the antenna. The rectangular waveguides 101 and 201 are connected by inserting the alignment pins 202 into the alignment holes 102. After the rectangular waveguides 101 and 201 are connected, the blades 203 are turned to fix the connection portions 100 and 200.

Akihiko Hirada, 7 others, "120GHz band radio video material transmission trial for radio broadcasting", NTT Technical Journal, December 2008, Vol. 20, No. 12, p.21-24

  However, the antenna connection method shown in FIG. 5 has a problem that precise processing accuracy can be obtained in order to align the fine rectangular waveguides 101 and 201. In addition, in order to put the positioning pin 202 into the positioning hole 102, it is necessary to accurately match the angle and position, and there is a problem that it takes time to mount the antenna. Furthermore, when the rectangular waveguides 101 and 201 are joined together, there is a problem that the inclination of the rectangular waveguides 101 and 201 may be shifted due to the play between the pins and the holes. If the inclination of the rectangular waveguides 101 and 201 is deviated, the transmission characteristics are greatly deteriorated.

  The present invention has been made in view of the above, and an object thereof is to easily attach an antenna having a waveguide input / output to a housing.

  A wireless device according to the present invention is a wireless device that uses an antenna attached to a housing, and the antenna has connection means in which a circular waveguide is formed along a cylindrical central axis. A signal module having a rectangular waveguide as input and output, and a waveguide having a square opening at one end and a circular opening at the other end, and a square opening connected to the input and output of the signal module A rectangular waveguide conversion unit; and a support unit that includes a cylindrical recess adapted to the shape of the connection unit and that has a circular opening exposed at the center of the bottom surface of the recess.

  In the above wireless device, the side surface of the connection means and the inner periphery of the recess are threaded.

  The wireless device includes an elastic body that press-joins a circular waveguide formed in the connection means and a circular opening exposed at the bottom surface of the recess.

  In the above wireless device, the elastic body is attached to the antenna and the housing.

  According to the present invention, an antenna having a waveguide input / output can be easily attached to a housing.

It is a side view which shows the structure of the antenna connection part of the radio | wireless apparatus in 1st Embodiment. It is a side view which shows the structure of the antenna connection part of another radio | wireless apparatus in 1st Embodiment. It is a side view which shows the structure of the antenna connection part of another radio | wireless apparatus in 1st Embodiment. It is a side view which shows the structure of the antenna connection part of the radio | wireless apparatus in 2nd Embodiment. It is the schematic which shows the structure of the antenna connection part of the conventional radio | wireless apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a side view illustrating a configuration of an antenna connection unit of a wireless device according to the first embodiment. In the figure, the casing 10 and the antenna 20 of the wireless device are separated, and a part of the casing 10 and the antenna 20 are shown in cross section.

  The antenna 20 is a Cassegrain antenna that includes a main reflecting mirror 21, a sub-reflecting mirror 22, and a primary radiator 23, and includes a connection portion 24 for attaching the antenna 20 to the housing 10. The connection portion 24 has a cylindrical shape, has a male screw portion 241 on the side surface, and has a circular waveguide 242 that communicates from one circular surface to the other circular surface along the central axis of the connection portion 24. One end of the circular waveguide 242 is connected to the primary radiator 23. The other end is exposed from the circular surface of the connecting portion 24 and is connected to the waveguide of the housing 10 when the antenna 20 is attached to the housing 10.

  The housing 10 includes a millimeter wave module 11 and a circular-rectangular waveguide conversion unit 12 inside, and a support unit 13 on the outside (surface). The millimeter wave module 11 includes a rectangular waveguide port 111 for inputting and outputting radio signals. The circular-rectangular waveguide converter 12 includes a waveguide having a square opening at one end and a circular opening at the other end. The rectangular opening is connected to the rectangular waveguide port 111 of the millimeter wave module 11, and the circular opening is arranged to be exposed to the outside (surface) of the housing 10. The support portion 13 has a cylindrical recess for inserting the connection portion 24 of the antenna 20, and a female screw portion 131 is formed on the inner periphery of the recess. In the center of the circular bottom surface of the concave portion, a circular opening of the circular-rectangular waveguide converter 12 exposed from the housing 10 is disposed. More specifically, the circular opening is arranged so that the center of the circular opening overlaps the central axis of the cylindrical recess.

  The radio apparatus shown in FIG. 1 attaches the antenna 20 to the housing 10 by screwing the connection portion 24 of the antenna 20 into the support portion 13 of the housing 10. As a result, the circular opening of the circular-rectangular waveguide converter 12 and the circular waveguide 242 of the connecting portion 24 are connected.

  Normally, since the input / output of the millimeter wave module 11 is a rectangular waveguide, the input / output of the antenna also becomes a rectangular waveguide accordingly. However, the primary radiator of the Cassegrain antenna or the parabolic antenna is a circular feed horn. Therefore, a circular-rectangular waveguide conversion is used in the antenna. In the present embodiment, the circular-rectangular waveguide converter 12 is provided in the housing 10 so that the connecting portion of the housing 10 and the antenna 20 is a circular waveguide. Generally, the position accuracy of the circular hole is better when the circular hole is formed by aligning the center with respect to the center of the circular part than when the circular part is processed at the center of the circular part. Therefore, the circular waveguide 242 is accurately provided on the central axis of the cylindrical connecting portion 24, and the circular opening of the circular-rectangular waveguide converting portion 12 is aligned with the center of the circular bottom surface of the cylindrical concave portion of the support portion 13. By disposing the center of the part, the problem of the center of the circular opening and the center of the circular waveguide 242 deviating can be avoided. Moreover, since the joint surface of the housing 10 and the waveguide of the antenna 20 is circular, there is no problem in the rotational direction in which the antenna 20 is screwed.

  FIG. 2 is a side view illustrating a configuration of an antenna connection unit of another wireless device according to the first embodiment.

  The wireless device shown in FIG. 2 differs from that shown in FIG. 1 in that it includes a spring 14 that pulls the millimeter wave module 11 and the circular-rectangular waveguide converter 12 toward the antenna 20. The millimeter wave module 11 and the circular-rectangular waveguide converter 12 are not fixed to the housing 10 and are movable in the direction of the antenna 20. By pulling the millimeter wave module 11 and the circular-rectangular waveguide converter 12 toward the antenna 20 by an elastic body such as a spring 14, the circular opening of the circular-rectangular waveguide converter 12 and the circular guide of the connecting portion 24 are connected. The joining surface of the wave tube 242 can be pressed and joined together.

  In addition, you may make it the structure which pushes the millimeter wave module 11 and the circular-rectangular waveguide conversion part 12 to the antenna 20 side from the left side of the millimeter wave module 11 on the figure.

  FIG. 3 is a side view illustrating a configuration of an antenna connection unit of still another wireless device according to the first embodiment.

  The main body of the antenna 20 shown in FIG. 3 is a rectangular waveguide for input and output. In general, since the input / output of the millimeter wave module 11 is a rectangular waveguide, the input / output of the antenna is often a rectangular waveguide. Therefore, in the radio apparatus shown in FIG. 2, the circular-rectangular waveguide conversion unit 25 is disposed between the main body of the antenna 20 and the connection unit 24. As a result, as in the wireless device shown in FIGS. 1 and 2, the joint surface of the housing 10 and the waveguide of the antenna 20 becomes circular, so that the antenna 20 can be accurately attached to the housing 10. Become. However, it is necessary to design so that the rectangular waveguide of the main body of the antenna 20 is arranged in a desired direction when the antenna 20 is attached to the housing 10.

  As described above, according to the present embodiment, the antenna 20 includes the columnar connection portion 24, and the housing 10 includes the support portion 13 having the columnar recess that matches the shape of the connection portion 24. At the same time, a circular waveguide 242 is formed along the central axis of the cylindrical connecting portion 24, arranged inside the housing 10 at the center of the bottom surface of the cylindrical concave portion, and connected to the millimeter wave module 11. By exposing the circular opening of the waveguide conversion unit 12, the antenna 20 can be easily attached to the housing 10 simply by fitting the connection unit 24 into the recess of the support unit 13. Further, the antenna 20 can be firmly fixed to the housing 10 by forming the male screw part 241 and the female screw part 131 by threading the connection part 24 and the support part 13.

  As shown in FIG. 2, the millimeter wave module 11 and the circular-rectangular waveguide converter 12 are movable without being fixed to the casing 10, and the circular opening and the connecting part of the circular-rectangular waveguide converter 12 are connected. The circular opening 242 of the circular-rectangular waveguide converter 12 and the joint surface of the circular waveguide 242 of the connecting portion 24 may be closely aligned by providing the spring 14 that press-bonds the circular waveguide 242 of the above.

[Second Embodiment]
FIG. 4 is a side view illustrating the configuration of the antenna connection unit of the wireless device according to the second embodiment.

  As in the first embodiment, the antenna connection unit of the wireless device according to the second embodiment includes the millimeter wave module 11 and the circular-rectangular waveguide converter 12 inside the housing 10. A support portion 31 is provided outside. The support part 31 has a cylindrical recess. The circular opening of the circular-rectangular waveguide converter 12 exposed from the housing 10 is disposed at the center of the circular bottom surface of the recess. That is, the circular opening is exposed at the bottom surface of the recess. The antenna 20 includes a connection portion 41 that is inserted into the hollow portion of the support portion 31. The connection portion 41 includes a circular waveguide 411 on the central axis.

  In the second embodiment, the female screw part and the male screw part are not formed in the support part 31 and the connection part 41, and a spring 32 is provided outside the housing 10. The antenna 20 is pulled toward the housing 10 by an elastic body such as a spring 32 to fix the connection portion 41 and the support portion 31, and the circular opening of the circular-rectangular waveguide conversion portion 12 and the circular waveguide 411 are pressed and joined. And fit together. The connection portion 41 and the support portion 31 are fixed by a fastener such as a bayonet mechanism, and as shown in FIG. 2, an elastic body such as a spring is provided inside the housing 10, and the millimeter wave module 11 and the circular-rectangular guide are provided. By pulling the wave tube converter 12 toward the antenna 20, the circular opening and the circular waveguide 411 may be closely aligned.

  As described above, according to the present embodiment, the antenna 20 includes the columnar connection portion 41, the housing 10 includes the support portion 31 having the columnar recess, and the housing 10 and the antenna 20 are connected to each other. By pulling and fixing with the spring 32, the antenna 20 can be easily attached to the housing 10 simply by fitting the connection portion 41 into the recess of the support portion 31.

DESCRIPTION OF SYMBOLS 10 ... Housing 11 ... Millimeter wave module 111 ... Rectangular waveguide port 12 ... Circular-rectangular waveguide conversion part 13 ... Support part 131 ... Female thread part 14 ... Spring 20 ... Antenna 21 ... Main reflecting mirror 22 ... Sub-reflecting mirror DESCRIPTION OF SYMBOLS 23 ... Primary radiator 24 ... Connection part 241 ... Male screw part 242 ... Circular waveguide 25 ... Circular-rectangular waveguide conversion part 31 ... Support part 32 ... Spring 41 ... Connection part 411 ... Circular waveguide

Claims (4)

A wireless device that uses an antenna attached to a housing,
The antenna is
Having a connecting means in which a circular waveguide is formed along a cylindrical central axis;
The housing is
A signal module having a rectangular waveguide as input and output;
A circular-rectangular waveguide conversion means comprising a waveguide having a square opening at one end and a circular opening at the other end, and connecting the square opening to the input / output of the signal module;
A wireless device comprising: a cylindrical recess adapted to the shape of the connection unit; and a support unit that exposes the circular opening at the center of the bottom surface of the recess.   The wireless device according to claim 1, wherein a side surface of the connection unit and an inner periphery of the recess are threaded.   The radio apparatus according to claim 1, further comprising an elastic body that press-joins a circular waveguide formed in the connection unit and a circular opening exposed on a bottom surface of the concave portion.   The wireless device according to claim 3, wherein the elastic body is attached to the antenna and the housing.

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