JP3209101B2 - Waveguide with suspension cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide with a shunt line in which a stub is provided on a waveguide having a flat cross section.

[0002]

2. Description of the Related Art A waveguide having a rectangular cross section has a problem that only a short waveguide can be manufactured due to its structure. To solve this problem, the cross section is made equivalent to the electrical characteristics of the rectangular waveguide. The waveguide is made longer by adopting a flat shape such as an ellipse or an ellipse.

That is, in the case of a waveguide having a flat cross section, for example, a strip-shaped metal conductor such as a copper tape is processed into a tubular shape, and the cross section is formed into a flat shape from outside by a forming roll or the like. A waveguide can be manufactured by using a cable manufacturing technique of forming the waveguide.

[0004]

However, in the case of the above-mentioned waveguide having a flat cross section, when an attempt is made to provide a suspension line for erection and support of the waveguide, the length of the suspension line depends on the position of the suspension line. It has been found that it is difficult to wind a lengthy waveguide around a drum.

[0005] As shown in FIG. 5, when the hanging wire 10 is wound around the drum 12 with the hanging wire disposed on the minor axis bb ′ of the waveguide conductor 11, the hanging wire 10 protrudes outward. Therefore, it is difficult to overlap and wind the outside of the waveguide 10 with a stranded wire, which is very inconvenient in terms of workability. Also, even if lap winding is possible, alignment lamination is not possible,
In addition to the problem that the winding length cannot be extended, there is a problem in that an external force is locally applied to the waveguide with the stranded wire, causing deformation. Even if the hanging wire 10 is embedded in the sheath 13, there is a difference between the winding radius of the waveguide and the winding radius of the hanging wire 10, and the difference causes internal stress over the entire length of the waveguide with the hanging wire. There is a problem that distortion occurs in the waveguide, which adversely affects the electrical characteristics of the waveguide.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to facilitate winding on a drum,
An object of the present invention is to provide a waveguide with a suspension line which is not inferior in quality even after being wound around a drum.

[0007]

In order to achieve the above-mentioned object, the present invention provides a structure comprising a tubular conductor having a long cross section.
A waveguide conductor having a flat shape consisting of a circle or an ellipse ;
In a waveguide with a stranded cable, comprising: a sheath covering an outer periphery of the waveguide conductor; and a stranded cable disposed along a longitudinal direction of the waveguide conductor to erected and support the waveguide conductor. co when the suspended line on the major axis axis of Namikan conductors are arranged
The waveguide conductor is located at a position around the major diameter portion.
And only one of the planes has an electric field radiation slot.
It is provided .

[0008] The two suspension lines may be provided so as to sandwich the waveguide conductor.

[0009] The waveguide conductor and the suspension wire may be commonly covered by the sheath.

[0010] The sheath may have a constricted portion between the waveguide conductor and the suspension line.

[0011]

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory view of a waveguide with a stub showing one embodiment of the present invention.

The waveguide conductor 1 disposed at the center is made of a metallic conductor such as copper, has a hollow tubular interior, and has a flat cross section such as an ellipse or an ellipse. Have been.

The suspension wire 2 is for supporting the waveguide conductor 1 and is made of a material such as steel wire or FRP. The suspension wire 2 is disposed along the longitudinal axis a-a ′ of the waveguide conductor 1 and at a position outside the waveguide conductor 1 along the longitudinal direction of the waveguide conductor 1. The waveguide conductor 1 and the suspension line 2 are commonly covered with a sheath 3 made of polyethylene or the like.

According to the configuration of the above-described waveguide with a wire according to the present invention, the whole shape is a flat plate shape, and there is no protruding portion as in the prior art, and the uneven plane of the waveguide with a wire is used. Since winding can be performed in a well-aligned manner so as to face the outer peripheral surface of the drum, the winding operation is easy, and external deformation due to winding around the drum can be prevented.

The waveguide conductor 1 may be composed of a composite of a plurality of different metals, or a composite of a metal and a resin, in addition to a simple metal such as copper as described above. Further, in order to improve flexibility, the waveguide conductor 1 may be subjected to a corrugating process.

Also, by providing the electric field radiation slots 4a and 4b in the waveguide conductor 1, the waveguide conductor 1 can function as a leaky waveguide. The electric field radiation slots 4 a and 4 b are through holes having a shape obtained by combining one or more of a circle, an ellipse, an oval, and a rectangle, and are provided along the longitudinal direction of the waveguide conductor 1. It is formed with a pitch and a predetermined hole size. Hole (slot)
Arbitrarily polarized light can be radiated by variously changing the arrangement pattern of. As shown in FIG.
It is preferable that the electric field radiation slots 4a and 4b are provided on an uneven plane of the waveguide conductor 1. This is because the leaky waveguide is often laid along the side of the moving body, and it is useful to radiate an electric field from the side surface of the waveguide with a stranded wire. Further, in the waveguide conductor 1, a larger current flows around the longer diameter portion than at the shorter diameter portion.
It is preferable to provide two electric field radiation slots 4a and 4b. A waveguide with a stub according to the present invention provided with a slot for electric field radiation according to the above configuration (hereinafter referred to as a leaky waveguide with a stub).
Is mainly laid along a wall surface in a tunnel or an underground building, and is used for high-frequency communication in a microwave band with a moving body such as a train or an automobile. The leaky waveguide with a suspension line laid in the building has a transmitter (not shown) connected to one end thereof,
Radio waves are supplied by the transmitter to propagate the radio waves to the waveguide conductor 1 and to leak the radio waves from the electric field radiation slots 4a and 4b, thereby transmitting a signal to the moving body. Radio waves transmitted from the moving body enter through the electric field radiation slots 4a and 4b, propagate through the waveguide conductor 1, and are received by a receiver (not shown) connected to one end of the waveguide conductor 1. In this way, communication with a mobile object can be realized.

FIG. 2 is an explanatory view of a waveguide with a suspension wire according to another embodiment of the present invention. FIG. 2 (a) is a sectional view and FIG. 2 (b).
Is a side view.

In the embodiment shown in FIG. 2, the description of the same reference numerals as those of the embodiment shown in FIG. 1 is omitted.

The difference from the embodiment of FIG.
Having the constricted portion 5.

With such a configuration in which the sheath 3 has the constricted portion 5, the amount of coating by the sheath 3 can be reduced, and the weight of the entire waveguide with a stranded wire can be reduced. In addition, as shown in FIG. 2B, by providing a slit 6 in the constricted portion 5, the weight can be further reduced and the flexibility can be improved.

FIG. 3 is an explanatory view of a waveguide with a shunt line showing another embodiment of the present invention.

In the embodiment of FIG. 3, the description of the same reference numerals as those in the embodiment of FIG. 1 is omitted.

The difference from the embodiment shown in FIG. 1 is that two suspension wires 2 are provided so as to sandwich the waveguide conductor 1 and two suspension wires 2 are provided.
And the waveguide conductor 1 are commonly covered by the sheath 3. In the embodiment of FIG. 1, since there is only one suspension line 2, when some pressure such as wind pressure is applied from the side, there is a large possibility that the waveguide with the suspension line will swing around the suspension line 2 like a pendulum. However, in the embodiment of FIG.
Are provided so as to sandwich the two waveguide conductors 1,
This is not the case, and the installation reliability can be improved.

FIG. 4 is an explanatory view of a waveguide with a shunt line showing another embodiment of the present invention.

The embodiment of FIG. 4 is different from the embodiment of FIG. 3 in that the sheath 3 has a constricted portion 5 as described in the embodiment of FIG. With such a configuration, the same effect as the embodiment of FIG. 2 can be further exhibited.

[0028]

As is apparent from the above description, according to the configuration of the waveguide with a stranded wire of the present invention, the whole shape is a flat plate shape, and the uneven plane of the waveguide with a stranded wire is a drum. Because it can be wound with good alignment to face the outer peripheral surface,
The winding operation is easy, and it is possible to provide a waveguide with a suspension wire which is not inferior in quality even after being wound around a drum.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a waveguide with a stub showing one embodiment of the present invention.

FIGS. 2A and 2B are explanatory views of a waveguide with a stub showing another embodiment of the present invention. FIG. 2A is a sectional view, and FIG. 2B is a side view.

FIG. 3 is an explanatory view of a waveguide with a shunt line showing another embodiment of the present invention.

FIG. 4 is an explanatory view of a waveguide with a shunt line showing another embodiment of the present invention.

FIG. 5 shows a comparative example of a waveguide with a suspension wire according to the present invention,
It is a figure which shows the state which wound the said waveguide with a suspension line around a drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waveguide conductor 2 Suspension line 3 Sheath 4a, 4b Slot for electric field radiation 5 Neck 6 Slit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-280504 (JP, A) JP-A-3-111010 (JP, A) JP-A-7-170122 (JP, A) 184049 (JP, U) Japanese Utility Model Application Hei 4-36304 (JP, U) Japanese Utility Model Showa 49-29839 (JP, Y1) Japanese Utility Model Utility Model Showa 40-6995 (JP, Y1) (58) Fields surveyed (Int. ⁷ , DB name) H01P 3/00 H01B 7/18 H01Q 13/20

Claims (4)

(57) [Claims] 1. A tubular conductor having an elliptical cross section.
Or, a waveguide conductor having a flat shape formed of an ellipse, a sheath covering the outer periphery of the waveguide conductor, and disposed along the longitudinal direction of the waveguide conductor to support and support the waveguide conductor. In the waveguide with a shunt line, the shunt line is arranged on the major axis of the waveguide conductor , and
The waveguide conductor is located at a position around a major diameter portion thereof, and
Only one of the planes has a slot for electric field radiation.
A waveguide with a suspension wire, characterized in that: 2. The waveguide with a wire according to claim 1, wherein two of the wire are provided so as to sandwich the waveguide conductor. 3. The apparatus according to claim 1, wherein said waveguide conductor and said suspension wire are commonly covered by said sheath.
3. The waveguide with a suspension line according to any one of claims 1 to 2. 4. The waveguide with a wire according to claim 3, wherein the sheath has a constricted portion between the waveguide conductor and the wire.