JPH0468801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna connection structure using a rectangular waveguide for a wireless device using microwave to millimeter wave bands.

In wireless communication devices and the like, communication is performed with each other using horizontally polarized waves or vertically polarized waves in order to improve the communication state, but this is selectively carried out as appropriate.

As shown in FIG. 4, the radio device 2 is mounted on the upper part of the frame 12 supported on the upper stand 11 of the support column 1 by means that can adjust the horizontal rotation direction and the vertical tilt.
Parapolar antennas 3 are each attached to the vertical plane,
A connection is made between the radio device 2 and the antenna 3 via a connection waveguide 4 .

In order to make the connection part of the waveguide 4 of the radio device 2 and the connection part on the antenna 3 side the same, a straight rectangular waveguide is used for flange connection, and the antenna 3 is rotated 90 degrees in the axial direction to change the polarization direction. If the waveguide is changed, a flange connection is made using a torsion waveguide twisted 90 degrees in the axial direction.

If the torsion waveguide is twisted to a short length, it is not favorable for radio wave transmission, so the torsion waveguide becomes relatively long, and it is not possible to shorten the distance between the antenna 3 and the wireless device 2 to make the whole waveguide smaller. Therefore, as shown in FIG. 5, a stack of three thin waveguide elements 5 for polarization direction conversion is interposed between the flanges.

Since each waveguide element 5 has approximately 1/4 wavelength of the radio wave used, an extremely short length is sufficient. That is, as shown in FIG. 6, the waveguide 21 on the wireless device 2 side
The long side of is horizontal, and the first stage waveguide element 51 is
The second stage waveguide element 52 is at a 22.5 degree rotation position, the third stage waveguide element 53 is at a 67.5 degree rotation position, and the long side of the waveguide 31 on the antenna 3 side is vertical. Laminate them and pass screws between the flanges and tighten.

In addition, the direction of polarization can be changed by making the long sides of the three waveguide elements 5 horizontal, and by tightening the antenna 3 in the same way as shown in FIG. 7.

The above may be prepared individually assembled, or may be disassembled and rearranged as necessary.

[Prior Art] Conventionally, the waveguide element 5 was located between the radio device 2 and the antenna 3.

[Problem that the invention seeks to solve]

To prevent raindrops and moisture from entering the waveguide when these are installed outdoors, O-ring gaskets 5 are installed on all connection contact surfaces as shown in Figure 5.
4, it was necessary to provide a groove therefor, and an O-ring gasket 54 had to be prepared for each attachment/detachment, which was troublesome and troublesome.

Therefore, an object of the present invention is to reduce the number of gaskets required when connecting a rectangular waveguide and a wireless device via a waveguide element for polarization direction conversion.

[Means for solving problems]

The above purpose is to provide a structure for connecting an antenna and a radio device via a rectangular waveguide, wherein a connecting portion of the radio device to which a flange of the rectangular waveguide is to be connected and a flange of the rectangular waveguide. A recess into which the waveguide element for polarization direction conversion is fitted is provided in the surface, and the waveguide element for polarization direction conversion is interposed in the recess, and between the wireless device on the outer peripheral surface and the flange surface. This is achieved by the present invention, in which a gasket surrounding the recess is arranged and connected.

[Effect]

The waveguide element for polarization direction conversion is embedded in a recess on the side of the wireless device, and is covered with a flange connected to the outside via a gasket, thereby preventing water from entering. Therefore, the gasket only needs to be provided at one location, and the number of gaskets can be reduced.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings. Note that parts that are equivalent to those of the prior art are designated by the same reference numerals.

FIG. 1 is a side view of a main part of an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view thereof.

The end face of the wireless device 2 and the waveguide 31 of the antenna 3 are flange-connected by a straight waveguide 6.
The flange 61 on the waveguide 31 side is a standard outdoor connection flange and is waterproof. The waveguide connecting portion 22 of the wireless device 2 opens at the center of the bottom surface of the recess 23, and the opening end surface is covered with a special large flange 62 of the waveguide 6. A groove 63 is formed around the periphery, and an O-ring gasket 64 is installed to prevent water from entering, and it is attached with a mounting screw 65 on the outside.

The recess 23 has a circular shape when viewed from the front, and the waveguide elements 51, 52, and 53 for polarization direction conversion having a circular outer shape fit therein. , by fitting the rest into the recess 23, the flange 62 is correctly aligned with the central axis of the recess 23. The waveguide elements 51, 52, 53 are fixed to the flange 62 by through screws 67, and are handled integrally with the waveguide 6.

The waveguide elements 51, 52, 53 have mounting holes as shown in FIG.
By attaching the screw 67 through holes A and A to the screw holes 2 and attaching it, the configuration as shown in Fig. 6 can be obtained.If the screw 67 is attached to the hole B and B by passing through it, it can be configured as shown in Fig. 7. The polarization direction can be changed as follows. Of course, the antenna 3 is rotated 90 degrees in the axial direction and fixed. In this case, selectively color-coded markings (not shown) are provided on the side surfaces of the flange 62 and the waveguide elements 51, 52, and 53 so that they can be positioned in a straight line in the above combination to facilitate confirmation.

〔Effect of the invention〕

As described above, according to the present invention, when connecting a rectangular waveguide and a wireless device via a waveguide element for polarization direction conversion, the connection portion between the flange of the rectangular waveguide and the wireless device is Since they are in direct contact, only one gasket is required to prevent water from entering, and the number of gaskets can be reduced. In addition, according to the present invention, the number of waveguide elements may be larger, and the position, number, etc. of screws are not limited to the embodiments.

[Brief explanation of the drawing]

Fig. 1 is a side view of a main part of an embodiment of the present invention, Fig. 2 is a partially enlarged cross section, Fig. 3 is an explanatory diagram of how to combine waveguide elements, and Figs. 4 and 5 are a side view of a conventional assembly. The partially enlarged cross-sections of FIGS. 6 and 7 are explanatory diagrams of assembly in which the polarization directions are different by 90 degrees. In the figure, 1 is a support column, 2 is a wireless device, 3 is an antenna, 5 is a waveguide element, and 6 is a connection waveguide.

Claims (1)

[Claims] 1 A structure in which an antenna and a radio device are connected via a rectangular waveguide, wherein the flange of the rectangular waveguide is connected to the connection part of the radio device and the flange surface of the rectangular waveguide. A recess into which a waveguide element for polarization direction conversion is fitted is provided, and the waveguide element for polarization direction conversion is interposed in the recess, and the recess is provided between the wireless device on the outer peripheral surface of the recess and the flange surface. An antenna connection structure characterized in that the connection is made by arranging a surrounding gasket.