JPH09246801A - Waveguide bent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity by forming an inner face of the outside of a waveguide bent that is formed by bending a waveguide at a desired angle to be stepwise face approximating a tapered face. SOLUTION: A stepwise face 4 is formed to an outer side face of a bent part of a waveguide bent 1, and since the stepwise face 4 is formed approximately to be a substantial 45 deg. tapered face 5, the propagation direction of waveguides 2, 3 is bent nearly close to the tapered face 5. That is, the waveguide bent 1 nearly equal to a conventional tapered face is formed by having only to form a step consisting of a parallel face and a vertical face with respect to a guide axis. Thus, it is not required to form a tapered face at a required angle managed with high precision with respect to the guide axis by having only to form faces parallel with and vertical to the guide axis and then the manufacture and the assembling of the waveguide bent are simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide bend, and more particularly to a waveguide bend suitable for use in a waveguide feeder circuit that is required to be downsized.

[0002]

2. Description of the Related Art In the case of forming a bent waveguide, a waveguide bend is provided for connecting waveguides whose tube axis directions are different from each other. Various types of waveguide bends have been proposed, for example, Bunichi Oguchi, "Microwave and Millimeter Wave Circuits", February 25, 1964, P. 31
3, 1st row-P. 316, line 9
This conventional waveguide bend is formed by bending the waveguide into a curved shape with a desired curvature in order to smoothly change the direction of the radio wave propagating in the waveguide along the bending direction.
Alternatively, it is formed by bending at a desired angle, and the outside inner surface of the bent portion is formed in a tapered shape. For example, FIG. 3 is a perspective view showing the waveguide bend 11 of the example in a perspective manner. The outside of the bent portion of the waveguides 12 and 13 formed by bending at a right angle is cut into a taper of 45 °. By attaching the taper plate 14 configured as a separate member to the cut portion,
The outside inner surface of the bent portion of the waveguide is a 45 ° tapered surface 15.

[0003]

In the conventional waveguide bend as described above, which is bent and formed with a desired curvature like the former, in order to change the propagation direction of the waveguide in a curved manner, Since the radius of the curved portion cannot be made too small, there is a problem that the waveguide bend is enlarged and a large space is required for its arrangement. In the latter case, in which the waveguide is bent at a desired angle and then the tapered portion is formed in the bent portion, the waveguide is accurately formed in a direction forming 45 ° with respect to the waveguide axis direction. In order to cut a wall and braze a pipe wall of another member to this cut portion to form a highly accurate taper surface of the angle, extremely high skill is required. There is also a problem that the assembly work becomes troublesome.

It is an object of the present invention to provide a waveguide bend that simplifies manufacturing and assembling work and enables downsizing.

[0005]

According to the waveguide bend of the present invention, in the waveguide formed by bending so that the tube axes intersect at a desired angle, the outside inner surface of the bent portion approximates a tapered surface. It is characterized in that it is composed of stepped steps. Here, the step surface is formed in a stepped shape in which a plurality of surfaces parallel and perpendicular to the tube axis are alternately continuous. The step surface is formed by cutting the outer surface of the bent portion of the waveguide in a stepwise manner, and integrally mounting a step plate bent in a stepwise manner on the cut portion. Alternatively, the step surface is formed in a part of a ridge having a width smaller than the width dimension of the waveguide, and the ridge is integrally attached to the waveguide.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a perspective view showing a first embodiment of the present invention in a transparent manner. The waveguide bend 1 is configured so that the waveguide axis direction is bent at a right angle, that is, 90 °, and the waveguides 2 and 3 whose pipe axes intersect at 90 ° are connected to each other. A waveguide having an L-shaped cross section along the axial direction is formed. A stepped step surface 4 is provided outside the bent portion of the waveguide 1. In this embodiment, the step surface 4 has a three-stage structure, and as shown in FIG.
When the 45 ° taper surface 5 is hypothesized outside the bent portion,
A line enveloping each step is formed so as to extend along the tapered surface 5 so that the step surface 4 is approximated to the tapered surface 5.

In order to form the step surface 4, the outside of the bent portion of the waveguides 2 and 3 is cut into a stepwise shape of three steps in which lines parallel and perpendicular to the tube axis are alternately continuous. Then, the cut portion is brought into contact with a step plate 6 which is a separate member bent in three steps, and the peripheral portion of the step plate 6 is brazed to the cut edge portion of the waveguide. Is formed by.

In the waveguide bend 1 thus constructed, a stepped step surface 4 is formed on the outer surface of the bent portion, and the step surface 4 is an original 45 ° tapered surface 5.
Since it is configured so as to approximate a surface approximated to, it is possible to bend the waveguide in the propagation direction in a state that is substantially close to the tapered surface. That is, in this embodiment, it is possible to form a waveguide bend substantially equivalent to a conventional tapered surface only by forming step-like steps that are surfaces that are parallel and perpendicular to the tube axis.

Therefore, it suffices to simply form a plane parallel or perpendicular to the tube axis, and it is not necessary to form a tapered surface having a required angle controlled with high accuracy with respect to the tube axis. Is extremely easy. In addition, since the waveguide bend itself is bent and formed at a desired angle, it goes without saying that the waveguide bend can be downsized as compared with the waveguide bend bent and formed.

In the above embodiment, the number of steps of the step surface is set to three, but if the number of steps is increased, the approximation to the tapered surface is approximated, and the characteristics similar to those of the waveguide bend having the tapered surface are obtained. Is obtained. However, as the number of stages increases, the number of manufacturing steps increases accordingly, so an appropriate number of stages may be set in consideration of this.

FIG. 2 is a perspective view of a waveguide bend 1A according to a second embodiment of the present invention. In this embodiment,
A ridge 7 having a stepped step surface 4 similar to that of the waveguide described in the first embodiment and having a width narrower than that of the waveguide is formed as a separate member from the waveguide. The waveguides 2 and 3 are integrally bonded to the outer inner surfaces of the bent portions. Also in this configuration, the bending effect of the waveguide can be obtained by the stepped step surface 4 provided on the outer inner surface of the bent portion of the waveguide by the ridge 7.

Further, in this embodiment, since the ridge 7 which is previously formed as a separate member is only fixedly adhered to the inner surface of the waveguide, it can be manufactured extremely easily. Even in this case, it is not necessary to form a tapered surface on the ridge 7, and it is sufficient to form the stepped step surface 4 that is a surface parallel to and perpendicular to the tube axis. Therefore, high precision processing is not necessary. , Can be easily manufactured.

[0013]

As described above, according to the present invention, the outer inner surface of the bent portion of the waveguide bend bent at a desired angle is formed by a stepped step surface that approximates a tapered surface. Further, it is possible to eliminate the processing of the portion of the pipe wall that is oblique with respect to the pipe axis, make it easy to manufacture, and improve the productivity. Further, since it is not necessary to form a curved bent portion, the propagation direction of the waveguide can be changed vertically with a minimum space, and the waveguide bend can be miniaturized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention in perspective view and a cross-sectional view of a main part.

FIG. 2 is a perspective view showing a second embodiment of the present invention in a perspective manner.

FIG. 3 is a perspective view showing an example of a conventional waveguide bend in a transparent manner.

[Explanation of symbols]

 1,1A Waveguide bend 2,3 Waveguide 4 Step surface 5 Tapered surface 6 Step plate 7 Ridge

Claims (4)

[Claims] 1. A waveguide formed by bending a tube axis so as to intersect at a desired angle, wherein an outer inner surface of the bent portion is constituted by a stepped step surface that approximates a taper surface. A waveguide bend that does. 2. The waveguide bend according to claim 1, wherein the step surface is formed by alternately connecting a plurality of surfaces parallel to and perpendicular to the tube axis. 3. The step surface is formed by cutting the outer surface of the bent portion of the waveguide stepwise, and integrally attaching a step plate bent and formed stepwise to the cut portion. Waveguide bend. 4. The step surface is formed on a part of a ridge having a width smaller than a width dimension of the waveguide, and the ridge is integrally attached to a bent portion of the waveguide. Waveguide bend.