JPH0728689Y2 - Helix type traveling wave tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a helix type traveling wave tube, and more particularly to the structure of a coaxial-waveguide conversion input / output section thereof.

[Conventional technology]

Conventionally, as shown in FIG. 3, the structure of this type of coaxial-to-waveguide conversion section includes a coaxial section composed of a coaxial outer conductor 1 and a coaxial inner conductor 2, a waveguide 3, a short-circuit plate 4, and a matching adjustment screw. It was composed of a waveguide section consisting of 5.

[Problems to be solved by the invention]

In the above-described structure of the conventional coaxial-to-waveguide conversion section, when the waveguide is connected to the coaxial section, the coaxial inner conductor 2 inserted into the waveguide 3 due to the dimensional accuracy and assembly accuracy of each component. The length of may differ from the design value. Therefore, the matching set at the time of design may not be satisfied. Therefore, the short-circuit plate 4 and the matching adjustment screw 5 are adjusted so that good matching can be obtained.
Since the length inserted into the waveguide 3 significantly affects the matching between the coaxial portion and the waveguide portion, there is a drawback that the alignment adjustment becomes extremely difficult.

[Means for solving problems]

According to the present invention, in a helix type traveling wave tube having an input / output section of a coaxial-to-waveguide conversion structure, the coaxial inner conductor of the coaxial-to-waveguide conversion section protrudes partway inside the waveguide. A variable inner conductor whose length is adjusted is provided at the tip of the conductor.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional view of the first embodiment of the present invention. The coaxial portion formed by the coaxial outer conductor 1, the coaxial inner conductor 2 having a screw portion, and the vacuum sealing insulating member 6 is formed by the waveguide 3, the short-circuit plate 4, and the matching adjustment screw 5. Connected to the department. The matching characteristic is obtained by turning the screw of the variable inner conductor 8 which is combined with the coaxial inner conductor 2 which has a threaded portion through the hole 7 formed in the wall surface of the waveguide 3 and which projects halfway through the waveguide 3. Adjustment. After that, the hole 7 is sealed by the sealing plate 9. As described above, according to this embodiment, the matching of the coaxial-waveguide converter can be well adjusted.

FIG. 2 is a vertical sectional view of a second embodiment of the present invention. First
The embodiment is different from the embodiment described above in that the variable inner conductor 8'attached to the coaxial inner conductor 2 has a slit portion. Therefore, there is an advantage that the matching characteristic can be easily adjusted by the fitting.

[Effect of device]

As described above, the present invention has a structure in which the length of the coaxial inner conductor inserted in the waveguide section can be varied, so that the matching in the coaxial-to-waveguide conversion section is achieved by the short-circuit plate and the matching adjustment screw. The effect is better and easier than the case where the adjustment is made good, and there is an effect that the reflection of the microwave generated when the microwave propagates from the slow wave circuit unit to the load circuit can be further reduced.

[Brief description of drawings]

1 and 2 are longitudinal sectional views of the first and second embodiments of the coaxial-to-waveguide converter according to the present invention used for the input / output section of a helix traveling wave tube, and FIG. It is a longitudinal cross-sectional view of a coaxial-waveguide conversion unit. DESCRIPTION OF SYMBOLS 1 ... Coaxial outer conductor, 2 ... Coaxial inner conductor, 3 ... Waveguide, 4 ... Short circuit plate, 5 ... Matching adjustment screw, 6 ... Vacuum sealing insulating member,
7 ... hole, 8,8 '... variable inner conductor, 9 ... sealing plate, 10 ... waveguide flange, 11 ... helix, 12 ... dielectric support, 13 ... helix shell.

Claims (1)

[Scope of utility model registration request] 1. A helix-type traveling wave tube having an input / output section of a coaxial-to-waveguide conversion structure, in which the coaxial inner conductor of the coaxial-to-waveguide conversion section projects to a midpoint of the waveguide. A helix-type traveling-wave tube, wherein a variable inner conductor whose length is adjusted is provided at the tip of the inner conductor.