Coaxial-waveguide conversion circuit, high-frequency conversion device, and manufacturing method thereof

Abstract

To provide a coaxial-waveguide conversion circuit, a high-frequency conversion device, and a manufacturing method thereof that easily connect a waveguide and an inner conductor.SOLUTION: A coaxial waveguide conversion circuit includes a waveguide, an inner conductor extending inside the waveguide, and a waveguide connection component connecting the inner conductor and the waveguide. The waveguide connection component includes a rotating member rotatable in a pressing direction, and a pressing member that rotates the rotating member in the pressing direction, and the rotating member has a pressing surface that can press the circumferential surface of the inner conductor by rotating in the pressing direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a coaxial waveguide conversion circuit, a high-frequency conversion device, and a manufacturing method thereof.

Background Art

[0002] It is known that a coaxial waveguide conversion circuit is used as a means for converting high frequencies.

[0003] For example, Patent Document 1 discloses a coaxial waveguide conversion circuit that is connected to a waveguide circuit via a coaxial high-frequency window to which a helix is connected and that converts high frequencies.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The coaxial waveguide conversion circuit disclosed in Patent Document 1 has a structure in which an inner conductor provided in a coaxial high-frequency window is coupled by the gripping force of a connecting component provided with a slit.

[0006] However, depending on the way the slit portion is constricted, the contact pressure applied to the contact surface with the inner conductor becomes small, making it difficult for the connecting component to grip the inner conductor and difficult to connect the waveguide and the inner conductor.

[0007] An object of the present disclosure is to provide a coaxial waveguide conversion circuit, a high-frequency conversion device, and a manufacturing method thereof that solve the above-described problems.

Means for Solving the Problems

[0008] The coaxial waveguide conversion circuit of the present disclosure includes a waveguide, an inner conductor extending inside the waveguide, and a waveguide connection component connecting the inner conductor and the waveguide. The waveguide connection component includes a rotatable member rotatable in a pressing direction and a pressing member for rotating the rotatable member in the pressing direction. The rotatable member has a pressing surface capable of pressing the circumferential surface of the inner conductor by rotation in the pressing direction.

[0009] The manufacturing method of the present disclosure includes the steps of arranging an inner conductor extending inside a waveguide within a rotation orbit of a pressing surface of a rotatable member included in a waveguide connection component that connects the inner conductor and the waveguide, and bringing the rotatable member into contact with the circumferential surface of the inner conductor by a pressing member that rotates the rotatable member in the pressing direction.

Advantages of the Invention

[0010] According to the coaxial waveguide conversion circuit, high-frequency conversion device, and manufacturing method according to the present disclosure, it is easy to connect the waveguide and the inner conductor.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0012] Hereinafter, each embodiment according to the present disclosure will be described with reference to the drawings. Note that the drawings and specific configurations used in each embodiment shall not be used for interpreting the disclosure. The same or corresponding components are denoted by the same reference numerals in all the drawings, and common descriptions are omitted. Note that in the present disclosure, the drawings are associated with one or more embodiments.

[0013] Hereinafter, an example of the configuration of the coaxial waveguide conversion circuit in the present disclosure will be described with reference to FIGS. 1 to 4.

[0014] (Configuration of Coaxial Waveguide Conversion Circuit) The high-frequency amplification circuit 10 is used to input a high frequency from the waveguide 11 to the traveling-wave tube 2 or output the high frequency amplified by the traveling-wave tube 2 to the waveguide 11. As shown in FIG. 1, the high-frequency amplification circuit 10 includes a coaxial waveguide conversion circuit 1 and a traveling-wave tube 2. The coaxial waveguide conversion circuit 1 is used as means for converting a high frequency. The traveling-wave tube 2 includes an electron gun and a helix which is a helical waveguide. The traveling-wave tube 2 amplifies a high frequency by causing the high frequency propagated in the helix and an electron beam passing through the center of the helix to interact with each other. Other waveguide shapes include Ring Bar, Folded Waveguide, coupled cavity type, etc.

[0015] The coaxial waveguide conversion circuit 1 includes a waveguide 11, an inner conductor 12, and a waveguide connection component 13. Regarding the connection with the inner conductor 12, the waveguide 11 has a fitting hole H on the upper surface extending in the longitudinal axis direction of the waveguide 11. The fitting hole H is for at least the rotating member 131 described later among the waveguide connection components 13 to fit into. Also, the shape of the fitting hole H is not limited. In the present disclosure, the fitting hole H is a round hole. For example, as in the present disclosure, in the waveguide 11, a flat surface may be formed around the fitting hole H. At the tip of the inner conductor 12, a helix provided in the traveling wave tube 2 is connected by welding. The inner conductor 12 extends inside the waveguide 11.

[0016] (Configuration of the waveguide connection component) The waveguide connection component 13 connects the inner conductor 12 and the waveguide 11. Also, the waveguide connection component 13 aims to achieve impedance matching between the waveguide 11 and the inner conductor 12. The waveguide connection component 13 is a conductor. The waveguide connection component 13 includes a rotating member 131 and a pressing member 132. Also, the waveguide connection component 13 may include a plurality of rotating members 131. In the present disclosure, it is assumed that the waveguide connection component 13 includes two rotating members 131.

[0017] (Configuration of the rotating member) The rotating member 131 is rotatable in the pressing direction R. The pressing direction R is a rotational direction with the edge of the fitting hole H as the rotation axis X, and is the direction in which the rotating member 131 presses the inner conductor 12. The rotating member 131 has a bent portion B in contact with the edge of the fitting hole H. The rotating member 131 has a seating surface SS and an outer peripheral surface C with the bent portion B in between. The seating surface SS of the rotating member 131 seats on the flat surface around the fitting hole H. As described above, if the surface around the fitting hole H is a flat surface, the seating surface SS may also be a flat surface. The outer peripheral surface C of the rotating member 131 is capable of contacting the inner peripheral surface IC of the fitting hole H before rotation in the pressing direction R. The rotating member 131 has a pressing surface Pr that can be pressed to make surface contact with the circumferential surface Ph of the inner conductor 12 by rotation in the pressing direction R. For example, the pressing surface Pr may have a shape along the circumferential surface Ph of the inner conductor 12. In a cross-section of the rotating member 131 in a plane including the central axis Ax, the cross-sectional shape of the rotating member 131 as a whole has a V shape. In the cross-sectional shape of the rotating member 131 in a plane including the central axis Ax, the rotating member 131 has a pressing surface Pr at one end on the inner conductor 12 side inside the back surface of the outer peripheral surface C. The rotating member 131 has an acting surface A on the back surface of the seating surface SS. The acting surface A exists at an end different from one end of the rotating member 131 having the pressing surface Pr. As an example, the rotating member 131 rotates the cross-sectional shape having the pressing surface Pr, the seating surface SS, the outer peripheral surface C, and the acting surface A with respect to the central axis Ax of the inner conductor 12, and the formed rotating body is divided by a cross-section perpendicular to the radial direction with respect to the central axis Ax. In the present disclosure, the rotating body divided into two in the cross-section perpendicular to the radial direction with respect to the central axis Ax is used as the rotating member 131 respectively. Note that the number of divisions of the rotating body is not particularly limited, and the inner conductor 12 will be gripped by each of the divided rotating members 131.

[0018] (Configuration of the pressing member) The pressing member 132 rotates the rotating member 131 in the pressing direction R. By pressing the acting surface A of the rotating member 131 having the cross-sectional shape described above, the rotating member 131 can rotate in the pressing direction R. For example, the pressing member 132 may have an inclined surface S that is inclined with respect to the central axis Ax of the inner conductor 12. That is, the pressing member 132 has a protruding portion that protrudes from the contact surface with the acting surface A on the rotating member 131 side. In the cross-sectional shape of the pressing member 132, the protruding portion has a reduced radial width with respect to the central axis Ax as it goes forward. With such a cross-sectional shape, the pressing member 132 has an inclined surface S on the protruding portion. Further, the inclined surface S can press the rotating member 131 toward the rotation axis X of the rotating member 131 when rotating in the pressing direction by the rotating member 131. The radial width of the base of the protruding portion with respect to the central axis Ax is determined so as to be the inclined surface S that can press the rotating member 131 toward the rotation axis X of the rotating member 131.

[0019] (Manufacturing method) A method for manufacturing the coaxial waveguide conversion circuit according to the present disclosure will be described. The method for manufacturing the coaxial waveguide conversion circuit according to the present disclosure is implemented according to the flow shown in FIG. 2.

[0020] First, the operator prepares a waveguide 11, an inner conductor 12, and a waveguide connection component 13 (step ST0).

[0021] Next, the operator disposes the inner conductor 12 extending inside the waveguide 11 within the rotation orbit of the pressing surface Pr of the rotating member 131 that the rotating member 131 provided in the waveguide connection component 13 for connecting the inner conductor 12 and the waveguide 11 can rotate in the pressing direction R (step ST1). Specifically, the operator fits the rotating member 131 into the fitting hole H and brings the outer peripheral surface C of the rotating member 131 into contact with the inner peripheral surface IC of the fitting hole H. The state at the time of contact is shown in FIG. 3. The plan view of the rotating member 131 arranged side by side in two pieces at the time of contact is as shown in FIG. 4. Since the rotating member 131 has an outer peripheral surface C that can contact the inner peripheral surface IC of the fitting hole H, there is a clearance between the pressing surface Pr of the rotating member 131 and the inner conductor 12 when contacting the inner peripheral surface IC. Therefore, using the clearance as a guide, the operator can dispose the inner conductor 12 within the rotation orbit of the pressing surface Pr. The rotation orbit of the pressing surface Pr is an orbit drawn by the rotation of the rotating member 131 in the pressing direction R with the edge of the fitting hole H as the rotation axis X when pressing, by the bending portion B of the rotating member 131 contacting the edge of the fitting hole H. Since the shape of the fitting hole H is not limited, the rotation axis X may be either a curve or a straight line.

[0022] Next, the operator brings the rotating member 131 into surface contact with the circumferential surface Ph of the inner conductor 12 by means of a pressing member 132 that rotates the rotating member 131 in the pressing direction R (step ST2). Specifically, the operator presses the working surface A of the rotating member 131 using the pressing member 132, whereby the rotating member 131 rotates in the pressing direction R with the edge of the fitting hole H as the rotation axis X. As a result, the clearance between the rotating member 131 and the inner conductor 12 disappears, and the pressing surface Pr of the rotating member 131 comes into surface contact with the circumferential surface Ph of the inner conductor 12 arranged within the rotation orbit, and the inner conductor 12 is clamped by the two rotating members 131. As described above, the inner conductor 12 is pressed by the rotation of the rotating member 131 and is gripped in the state shown in FIG. 1. (End)

[0023] Also, in step ST2, the pressing surface Pr and the circumferential surface Ph of the inner conductor 12 are parallel to each other.

[0024] For example, the operator may bring a plurality of rotating members 131 obtained by dividing the rotating body into surface contact with the circumferential surface Ph of the inner conductor 12 by means of the pressing member 132. As a result, the plurality of rotating members 131 can press the inner conductor 12 from the pressing direction R. In the present disclosure, the two rotating members 131 sandwich the inner conductor 12 from both the left and right sides.

[0025] For example, when rotating, the operator may press the rotating member 131 using a pressing member 132 having an inclined surface S that can press the rotating member 131 toward the rotation axis X of the rotating member 131. As a result, the bent portion B of the rotating member 131 can be brought into contact with the edge of the fitting hole H.

[0026] (Operation and Effect) According to the coaxial waveguide conversion circuit 1 of the present disclosure, by pressing the rotating member 131 using the pressing member 132, the rotating member 131 rotates in the pressing direction R with the edge of the fitting hole H as the rotation axis X. As a result, the pressing surface Pr of the rotating member 131 comes into surface contact with the inner conductor 12 arranged within the rotation orbit, and the inner conductor 12 can be gripped by pressing. Therefore, according to the coaxial waveguide conversion circuit 1 according to the present disclosure, it is easy to connect the waveguide and the inner conductor.

[0027] Figs. 5 - 7 show comparative examples. Fig. 5 shows an input section for inputting a high frequency from a waveguide to a traveling - wave tube or an output section for outputting the high frequency amplified by the traveling - wave tube to the waveguide. The helix 30 is connected to the waveguide 38 via a coaxial - type high - frequency window 32. The coaxial - type high - frequency window 32 includes a coaxial - part outer conductor 33(37), a coaxial - part inner conductor 34(34a), and a dielectric component 35. The dielectric component 35 shields the helix 30 part that becomes a vacuum and the waveguide 38 in the atmosphere, maintaining the vacuum of the helix 30 part. There is a high - frequency matching component 39 between the coaxial - type high - frequency window 32 and the waveguide 38 to match their impedances. Also, as shown in the partial cross - sectional view excluding the high - frequency matching component 39 in Fig. 6, the high - frequency matching component 39 is in a plurality of split - shaped forms, and the thickened coaxial - part inner conductor 34a at one end of the coaxial - type high - frequency window 32 is gripped with a gripping force by the split. The reason for the split shape is that when gripping with a shape in complete contact with the coaxial - part inner conductor 34a or when holding the coaxial - part inner conductor 34a in a screw shape, there may be mechanical destruction due to thermal expansion of the high - frequency matching component 39 caused by heat transfer from the waveguide.

[0028] In the comparative example, the thickened coaxial - part inner conductor 34a at one end of the coaxial - type high - frequency window 32 is gripped with a gripping force by the split. However, there are gaps as shown in Fig. 7 on the contact surface between the coaxial - part inner conductor 34a and the split - shaped high - frequency matching component 39, so the contact pressure applied to the contact surface may be small or the magnitude of the contact pressure may vary. In addition, the existence of the gaps may reduce the contact area.

[0029] In a traveling wave tube, heat is generated when the electron beam passing through the center of the helix 30 hits the inner wall of the helix 30, or due to losses during high-frequency propagation. The heat generated in the helix 30 is dissipated from the outer enclosure 31 of the traveling wave tube, and is also dissipated from the waveguide 38 via the coaxial inner conductor 34(34a) connected to the helix 30 and the high-frequency matching component 39. Therefore, if the contact between the coaxial inner conductor 34a and the grinding 39 is insufficient, heat dissipation from the waveguide 38 may become insufficient. If heat dissipation is insufficient, it may cause a temperature rise in the coaxial inner conductor 34(34a) or the helix 30, deteriorating the electrical characteristics of the traveling wave tube and causing instability in the operation of the traveling wave tube.

[0030] In contrast to the comparative example, in the coaxial waveguide conversion circuit 1 according to the present disclosure, by using the pressing member 132 to rotate the rotating member 131 in the pressing direction R, the pressing surface Pr of the rotating member 131 and the inner conductor 12 disposed within the rotation orbit are in surface contact, and the inner conductor 12 is gripped by pressing. By gripping the inner conductor 12 by pressing, the rotating member 131 can apply a contact pressure to the inner conductor 12 and prevent variations in the contact pressure. Also, by making surface contact, the contact area is less likely to decrease. Thereby, a stable contact pressure can be obtained between the inner conductor 12 and the waveguide connection component 13. Also, by pressing the inner conductor 12 in the pressing direction R by the rotating member 131, the contact pressure is less likely to be affected by the shape dimensions, and mechanical attachment is possible. Therefore, by obtaining the contact pressure, variations in heat dissipation from the waveguide 11 can be suppressed, and stable characteristics of the traveling wave tube can be obtained.

[0031] In addition, the coaxial waveguide conversion circuit includes "a waveguide 11, an inner conductor 12 extending inside the waveguide 11, and a waveguide connection component 13 connecting the inner conductor 12 and the waveguide 11. The waveguide connection component 13 includes a rotating member 131 rotatable in the pressing direction R and a pressing member 132 for rotating the rotating member 131 in the pressing direction R. The rotating member 131 has a pressing surface Pr capable of pressing the peripheral surface Ph of the inner conductor 12 by rotation in the pressing direction R", and the following effects can be obtained thereby. In the coaxial waveguide conversion circuit of the present disclosure, by using the pressing member 132 to press the rotating member 131, the rotating member 131 rotates in the pressing direction R. Thereby, the pressing surface Pr of the rotating member 131 can be brought into contact with the inner conductor 12 disposed within the rotation orbit, and the inner conductor 12 can be gripped by pressing. Therefore, "According to the coaxial waveguide conversion circuit of the present disclosure, it is easy to connect the waveguide and the inner conductor." This effect can be obtained.

[0032] In addition, in the coaxial waveguide conversion circuit of the present disclosure, by further "the waveguide connection component 13 including a plurality of rotating members 131", the plurality of rotating members 131 can press the inner conductor 12 from the circumferential direction. Thereby, "the coaxial waveguide conversion circuit of the present disclosure can easily grip the inner conductor 12 by pressing." This effect can also be obtained.

[0033] In addition, in the coaxial waveguide conversion circuit of the present disclosure, by further "the pressing member 132 having an inclined surface S capable of pressing the rotating member 131 toward the rotation axis X of the rotating member 131 during rotation", the inclined surface S aligns the bent portion B of the rotating member 131 with the rotation axis X, and the bent portion B of the rotating member 131 can be brought into contact with the edge of the fitting hole H. Thereby, "the coaxial waveguide conversion circuit of the present disclosure can grip the inner conductor 12 while pressing with a constant force by determining the rotation axis X." This effect can also be obtained.

[0034] In addition, in the coaxial waveguide conversion circuit of the present disclosure, further, "the waveguide 11 has a fitting hole H, and the rotating member 131 has an outer peripheral surface C that can contact the inner peripheral surface IC of the fitting hole H". Thus, since the rotating member 131 has an outer peripheral surface C that can contact the inner peripheral surface IC of the fitting hole H, when contacting the inner peripheral surface IC, there is a clearance between the pressing surface Pr of the rotating member 131 and the inner conductor 12. Therefore, using the clearance as a guide, an operator can place the inner conductor 12 within the rotation orbit of the pressing surface Pr. Accordingly, it is easy for the operator to create the coaxial waveguide conversion circuit.

[0035] Also, by pressing one end of the rotating member 131 using the pressing member 132, the rotating member 131 can rotate in the pressing direction R with the edge of the fitting hole H as the rotation axis X. For this reason, an operator can operate the connection between the inner conductor 12 and the waveguide 11 from the outside of the waveguide 11. Accordingly, it is easy for the operator to create the coaxial waveguide conversion circuit.

[0036] In an example of the above disclosure, the rotating member 131 may have a slit on the pressing surface Pr. As shown in FIG. 8, due to one slit on the pressing surface Pr, the pressing surface Pr of each rotating member 131α is divided into two. By having a slit on the pressing surface Pr, mechanical destruction due to thermal expansion of the rotating member 131α caused when heat generated by the helix is transmitted to the rotating member 131α via the inner conductor 12, or displacement at the contact location between the inner conductor 12 and the pressing surface Pr caused by thermal expansion of the rotating member 131α is less likely to occur. The number of slits may be even more, but when the number of slits is odd and the positions of the slits are point-symmetrical with respect to the central axis Ax when two rotating members 131α are arranged side by side, the uniformity of the force applied to the inner conductor 12 is enhanced when the two rotating members 131α sandwich the inner conductor 12 from both left and right sides.

[0037] In an example of the above disclosure, the coaxial waveguide conversion circuit may further include a deformable conductor, and the inner conductor 12 may be pressed against the rotating member 131 via the conductor. As shown in FIG. 9, the coaxial waveguide conversion circuit further includes a deformable conductor 5 at the contact portion between the pressing surface Pr and the inner conductor 12, so that the contact area between the inner conductor 12 and the waveguide connection component 13 can be increased. Also, due to the deformable conductor 5, the coaxial waveguide conversion circuit can be gripped without the conductor 5 getting in the way by gripping by pressing.

[0038] In an example of the above disclosure, the inner conductor 12 was gripped by two rotating members 131, but the inner conductor 12 may be gripped by one rotating member 131. For example, another member contacts the peripheral surface Ph of the inner conductor 12, and the rotating member 131 is disposed at a position that is point-symmetrical with the other member with respect to the central axis Ax, and the inner conductor 12 may be pressed and gripped by the rotating member 131.

[0039] Hereinafter, an example of the coaxial waveguide conversion circuit in the present disclosure will be described with reference to FIG. 10.

[0040] (Configuration) The coaxial waveguide conversion circuit 1m includes a waveguide 11m, an inner conductor 12m extending inside the waveguide 11m, and a waveguide connection component 13m that connects the inner conductor 12m and the waveguide 11m. The waveguide connection component 13m includes a rotating member 131m that can rotate in the pressing direction R', and a pressing member 132m that rotates the rotating member 131m in the pressing direction R'. The rotating member 131m has a pressing surface Pr' that can press the peripheral surface Ph' of the inner conductor 12m by rotation in the pressing direction R'.

[0041] (Operation and Effect) According to the coaxial waveguide conversion circuit 1m of the present disclosure, by using the pressing member 132m to press the rotating member 131m, the rotating member 131m rotates in the pressing direction R'. As a result, the pressing surface Pr' of the rotating member 131m presses the peripheral surface Ph' of the inner conductor 12m, and the waveguide connection component 13m and the inner conductor 12m come into contact by pressing. Therefore, according to the coaxial waveguide conversion circuit 1m according to the present disclosure, it is easy to connect the waveguide and the inner conductor.

[0042] Hereinafter, an example of the manufacturing method in the present disclosure will be described with reference to FIG. 11. The manufacturing method in the present disclosure is implemented according to the flow shown in FIG. 11.

[0043] The manufacturing method includes a step (step ST10) of disposing an inner conductor extending inside the waveguide within a rotation orbit of a pressing surface of a rotating member having a rotating member that can rotate in a pressing direction provided in a waveguide connection component that connects the inner conductor and the waveguide, and a step (step ST20) of bringing the rotating member into contact with the circumferential surface of the inner conductor by a pressing member that rotates the rotating member in the pressing direction.

[0044] (Function and Effect) According to the manufacturing method of the present disclosure, by using the pressing member to press the rotating member, the rotating member rotates in the pressing direction. As a result, the rotating member comes into contact with the circumferential surface of the inner conductor disposed within the rotation orbit of the pressing surface. Therefore, according to the manufacturing method according to the present disclosure, it is easy to connect the waveguide and the inner conductor.

[0045] As described above, the present disclosure has been described with reference to the embodiments, but the present disclosure is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. And each embodiment can be combined with other embodiments as appropriate.

[0046] Part or all of the above disclosure may be described as follows in the appended claims, but is not limited thereto.

[0047] (Appended Claim 1) A waveguide, an inner conductor extending inside the waveguide, a waveguide connection component that connects the inner conductor and the waveguide, comprising, the waveguide connection component includes, a rotating member that can rotate in a pressing direction, a pressing member that rotates the rotating member in the pressing direction, comprising, The rotating member has a pressing surface that can press the circumferential surface of the inner conductor by rotating in the pressing direction Coaxial waveguide conversion circuit.

[0048] (Appendix 2) The waveguide connection component includes a plurality of the rotating members The coaxial waveguide conversion circuit according to Appendix 1.

[0049] (Appendix 3) The rotating member has a slit on the pressing surface The coaxial waveguide conversion circuit according to Appendix 1 or Appendix 2.

[0050] (Appendix 4) The pressing member has an inclined surface that can press the rotating member toward the rotation axis of the rotating member during the rotation The coaxial waveguide conversion circuit according to Appendix 1 or Appendix 2.

[0051] (Appendix 5) The waveguide has a fitting hole, The rotating member has an outer circumferential surface that can contact the inner circumferential surface of the fitting hole The coaxial waveguide conversion circuit according to Appendix 1 or Appendix 2.

[0052] (Appendix 6) Further includes a deformable conductor, The inner conductor is pressed against the rotating member via the conductor The coaxial waveguide conversion circuit according to Appendix 1 or Appendix 2.

[0053] (Appendix 7) The coaxial waveguide conversion circuit according to Appendix 1 or Appendix 2, A traveling wave tube, and A high-frequency conversion device.

[0054] (Appendix 8) A step of disposing an inner conductor extending inside a waveguide within a rotation orbit of a pressing surface of a rotating member included in a waveguide connection component that connects the inner conductor and the waveguide, the rotating member being rotatable in a pressing direction; A step of bringing the rotating member into contact with a circumferential surface of the inner conductor by a pressing member that rotates the rotating member in the pressing direction; Including Manufacturing method.

[0055] (Appendix 9) In the step of bringing into contact, A plurality of the rotating members are brought into surface contact with the circumferential surface of the inner conductor The manufacturing method according to Appendix 8.

[0056] (Appendix 10) In the step of bringing into contact, During the rotation, pressing is performed by the pressing member having an inclined surface capable of pressing the rotating member toward the rotation axis of the rotating member The manufacturing method according to Appendix 8 or Appendix 9.

Explanation of Signs

[0057] 1 Coaxial waveguide conversion circuit 1m Coaxial waveguide conversion circuit 2 Traveling wave tube 10 High-frequency amplification circuit 11 Waveguide 11m Waveguide 12 Inner conductor 12m Inner conductor 13 Waveguide connection component 13m Waveguide connection component 131 Rotating member 131m Rotating member 132 Pressing member 132m Pressing member 5 Conductor B Bending portion A Working surface Ax Central axis C Outer circumferential surface SS Seating surface H Fitting hole IC Inner circumferential surface Peripheral surface Peripheral surface Ph' Pressing surface Pressing surface Pr' Pressing direction Pressing direction R' Inclined surface Rotation axis

Claims

1. A waveguide, an inner conductor extending inside the waveguide, a waveguide connection component connecting the inner conductor and the waveguide, comprising: wherein the waveguide connection component comprises a rotatable member rotatable in a pressing direction, and a pressing member for rotating the rotatable member in the pressing direction, comprising: wherein the rotatable member has a pressing surface capable of pressing the circumferential surface of the inner conductor by rotation in the pressing direction coaxial waveguide conversion circuit.

2. The waveguide connection component includes a plurality of the rotatable members The coaxial waveguide conversion circuit according to claim 1.

3. The rotatable member has a slit on the pressing surface The coaxial waveguide conversion circuit according to claim 1 or claim 2.

4. The pressing member has an inclined surface capable of pressing the rotatable member toward the rotation axis of the rotatable member during the rotation The coaxial waveguide conversion circuit according to claim 1 or claim 2.

5. The waveguide has a fitting hole, and the rotatable member has an outer circumferential surface capable of contacting the inner circumferential surface of the fitting hole The coaxial waveguide conversion circuit according to claim 1 or claim 2.

6. further comprising a deformable conductor, wherein the inner conductor is pressed against the rotatable member via the conductor The coaxial waveguide conversion circuit according to claim 1 or claim 2.

7. The coaxial waveguide conversion circuit according to claim 1 or claim 2, a traveling wave tube, comprising: high-frequency conversion device.

8. placing an inner conductor extending inside the waveguide within an orbital path of a pressing surface of a rotatable member that is rotatable in a pressing direction and is provided in a waveguide connection component connecting the inner conductor and the waveguide; contacting the rotatable member with the circumferential surface of the inner conductor by a pressing member that rotates the rotatable member in the pressing direction; including: manufacturing method.

9. In the contacting step, bringing a plurality of the rotatable members into surface contact with the circumferential surface of the inner conductor The manufacturing method according to claim 8.

10. In the contacting step, pressing with the pressing member having an inclined surface capable of pressing the rotatable member toward the rotation axis of the rotatable member during the rotation The manufacturing method according to claim 8 or claim 9.

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