JPS6141281Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a prefabricated waveguide stub tube.

Conventionally, microwave components such as directional couplers with 90°C hybrid characteristics were installed in waveguides to increase the voltage standing wave ratio (VSWR).
When finely adjusting the ratio and phase, the following method is used.

A plurality of through holes are made in the waveguide from the top, stubs such as cylindrical conductor rods are inserted into these through holes, and the amount of protrusion of the conductor rods into the waveguide is adjusted.

Adjustments are made by applying mechanical pressure from the outside of the waveguide to deform the cross-sectional shape inside the waveguide.

However, these methods had the following drawbacks.

In the case of the above method, since the conductor rods are inserted into the waveguide, these conductor rods form discontinuous protrusions, and as a result, there is a possibility that microwave discharge may occur during operation at high power. In addition, when microwaves are normally operated at high power, the inside of the waveguide is often vacuumed for reasons such as preventing discharge, and the seal between the through hole drilled in the waveguide and the conductor rod inserted into the through hole is There was a risk of air leakage from the area. In the case of the above method, workability is poor and it is not suitable for mass production, and it is extremely difficult to adjust two independent parameters, VSWR and phase, at the same time.

The present invention was developed in view of the above circumstances, and it can be simply installed at a predetermined location within the waveguide without mechanically deforming the waveguide or creating a through hole.
The object of the present invention is to provide a prefabricated waveguide stub tuner that can adjust VSWR and phase at the same time.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A prefabricated waveguide stub tuner, which is an embodiment of the present invention, will be described below with reference to FIG.

In the figure, reference numeral 1 denotes a first metal stub having a concave female screw portion 2 at one end. The side wall of the first stub 1 is provided with first screw-tightening holes 3 ₁ and 3 ₂ that are vertically spaced apart and orthogonal to each other. In addition, in the longitudinal direction (vertical direction) of the first stub 1, the through holes 3 ₂ for screw tightening are provided from the other end surface.
A first air vent hole 4 penetrating through is provided. The other end surface of the first stub 1 is provided with, for example, a ring-shaped first V-groove 5 in which a caulking material described later is installed. A second metal stub 7 having a male threaded portion 6 at one end is screwed into the female threaded portion 2 of the first stub 1 via the male threaded portion 6 . The side wall of the second stub 7 is provided with second screw-tightening holes 8 ₁ and 8 ₂ that are vertically spaced apart and orthogonal to each other. Further, in the longitudinal direction (vertical direction) of the second stub 7, a second air vent hole 9 is provided which penetrates from the other end surface to the second screw tightening through hole ₈₂ . Further, a ring-shaped second V-groove 10 similar to the first V-groove 5 described above is provided on the other end surface of the second stub 7. The first and second stubs 1 and 7 constitute a stub tuner 11.

Next, the second section describes how to install the prefabricated waveguide stub tuner 11 having such a structure in a waveguide.
This will be explained based on the diagram. First, a predetermined preliminary test is conducted to determine the position in the waveguide where the prefabricated waveguide stub tuners (stub tuners) 11 should be installed and the outer diameter dimensions of the stub tuners 11 . Next, a plurality of stub tuners 11 are placed at predetermined locations in the waveguide 12 having a rectangular cross-section, and indium is placed in the first and second V-grooves 5 and 10 of the first and second stubs 1 and 7, respectively. The stub tunnelers 11 are arranged perpendicularly to the upper and lower inner wall surfaces of the waveguide 12, with a ring-shaped caulking member (not shown) interposed therebetween. Next, for example, with the jig rod passed through the first screw tightening through hole ₃₁ of the first stub 1 of the stub tuner 11 and the first stub 1 fixed, one of the second stubs 7 is Pass the jig rod through the screw fastener through hole 81 of No. ₂ , rotate it in the direction (counterclockwise) to loosen the second stub 7 with respect to the first stub 1, and loosen both end surfaces of the stub tuner 11. The stub tube 11 is brought into contact with the upper and lower inner wall surfaces of the waveguide 12 via caulking material, and then passed through the other second screw tightening through hole ₈₂ and further rotated in the same manner as described above. ... is completely fixed within the waveguide 12.

According to the prefabricated waveguide stub tuner 11 having the above structure, the stub tuner 11 has a prefabricated structure consisting of the first and second stubs 1 and 7 that can move up and down, and Stub 1,
V-groove portions 5 and 10 are provided on the upper end surface of V-groove portions 5 and 10 in which caulking materials to help fix the waveguide 12 to the upper and lower inner wall surfaces when the stub tuner 11 is installed on the waveguide 12, respectively. . Therefore, it is possible to adjust the VSWR and phase at the same time by simply installing the waveguide at a predetermined position within the waveguide 12 without mechanically deforming the waveguide 12 or providing a through hole as in the past. can. In addition, unlike in the past, the guide tube 12 is not provided with through holes, and the conductor rods are not protruded into the waveguide 12 from these through holes, so that no discontinuous protrusions occur within the waveguide 12. As a result, there is no fear that microwave discharge will occur due to these protrusions during operation at high power. Furthermore, since no through hole is provided in the waveguide 12, there is no risk of air leakage from the seal between the through hole and the conductor rod inserted into the through hole, unlike in the conventional case.

Further, in the longitudinal direction of the first and second stubs 1 and 7 of the stub tuner 11, first and second screw-tightening through holes 3 and 2 are formed from both end surfaces of the first and second stubs 1 and 7 _{, respectively} . , 8 _2, if the first and second air vent holes 4 and 9 are provided, the stub tuber 11
When ... is installed in the waveguide 12, caulking materials installed in the upper and lower inner wall surfaces of the waveguide 12, both end surfaces of the first and second stubs 1 and 7, and the V-grooves 5 and 10 on both end surfaces. Air can be released from the gap formed by the stub tube 11, and the stub tube 11 can be fixed well.

In the above embodiment, the upper end surfaces of the first and second stubs are provided with a V-groove portion, but the present invention is not limited to this, and a U-shaped groove portion or the like may be used.

Further, in the above embodiments, indium is used as the caulking material attached to the V-groove portion, but the caulking material is not limited thereto.

As detailed above, according to the present invention, the VSWR and phase of the waveguide can be adjusted without mechanically deforming the waveguide used in the microwave transmission path of a linear accelerator or the like, or without providing a through hole. It is possible to provide a prefabricated waveguide stub tuner that can be adjusted at the same time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a prefabricated waveguide stub tunner that is an embodiment of the present invention, and FIG. 2 is a schematic perspective view showing the prefabricated waveguide stub tunner of FIG. 1 fixed in a waveguide. It is a diagram. 1...First stub, 2...Female screw part, 3
₁ , 3 ₂ ... First screw tightening hole, 4 ... First air vent hole, 5 ... First V groove, 6 ... Male thread part, 7 ... Second stub, 8 ₁ , 8 ₂ ...
2nd screw tightening through hole, 9... second air vent hole, 10... second V-groove portion, 11... prefabricated waveguide stub turret, 12... waveguide.

Claims (1)

[Scope of utility model registration request] a first stub having a female thread on one end surface;
A second stub, which has a male threaded part on one end side and is screwed to the female threaded part of the first stub via the male threaded part, and a second stub that is perpendicular to the side wall of the first stub and spaced apart from each other up and down. A first screw tightening hole, an annular first groove provided on the other end surface of the first stub, and a second screw that is vertically spaced apart from each other and orthogonal to the side wall of the second stub. A prefabricated waveguide stub tunneler comprising a tightening through hole and a second annular groove provided on the other end surface of the second stub.