DE1035798B - Waveguide operated in a vacuum - Google Patents

Description

GERMAN

The invention relates to a waveguide operated in a vacuum, in particular in the form of a helical delay line for traveling wave tubes od. The like., whose holding parts are located or have distributed damping masses separated from the waveguide by an insulating intermediate layer.

Traveling wave tubes are generally damped so that the damping mass, z. B. graphite, Coal or metal, directly on the holding parts of the mostly helical delay line is attached. In many cases, the helix is attached to rods made of quartz, ceramic, glass or another suitable one Insulating material held, or it is directly in pipes made of such insulating materials of circular or profiled cross-section. In these cases, a damping layer is usually used immediately on the holding parts.

If the damping mass is in direct contact with the helix, the largest per unit of length will be Attenuation achieved. However, the absolute size of the total attenuation is practically not reproducible, because every point of contact between the coil and the damping layer is a more or less undefined high-frequency contact which can change even if the coil is jolted. aside from that it is difficult to achieve a smooth transition from the undamped to the damped part of the helix.

It is known in traveling wave tubes that the filament is spaced apart in the area of its contact surfaces of the damping masses to give that the helix possesses an equal layer thickness insulating cover is provided.

The object of the invention is to create a time-constant high-frequency transition from the helical delay line to the damping masses applied to axially parallel holding rods.

The essential feature of the invention is that a thin, evenly distributed and completely covering intermediate layer of quartz is applied firmly.

The arrangement according to the invention has the essential advantages that the damping means of the intermediate layer is mechanically protected and a certain contact pressure can be used and furthermore, the damping masses are not damaged when the helix is introduced. In addition, at complete covering of the damping layer for this a material that is otherwise used for vacuum purposes is not suitable. Another advantage is that the efficiency by the erfindüngsgemäße Attachment of the intermediate layer in comparison

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Dipl.-Ing. Werner Eichin, Munich,
has been named as the inventor

is not reduced to arrangements without an intermediate layer.

It is important that the quartz coating adheres mechanically firmly and is relatively hard, so that it is not damaged by the coil itself. One will continue to be concerned about that to keep dielectric losses as small as possible. Finally, the layer must be as homogeneous and as possible very thin and evenly distributed over the entire length.

A coating of quartz, which is applied, for example, in a manner known per se by vapor deposition, cathode sputtering or the like in a vacuum, to the holding parts previously provided with damping compound, is particularly suitable for fulfilling the requirements described. The layer thickness of the coating can be kept so small that the amount of damping per unit length is practically exactly as large as damping with a directly adjacent graphite, carbon or metal layer. The thickness can be 0.1 to 1 μ, for example.

The invention is to be explained in more detail with reference to the drawing.

The figures show exemplary embodiments in their essential parts for the invention.

In Fig. 1, a holding part 1 is illustrated in the form of a quartz or ceramic rod against which the helical delay line 4 is supported. On the side of the holding part facing the waveguide 1 a damping in the form of a thin graphite, carbon or metal layer 2 is attached.

This is provided with a thin, evenly distributed quartz coating 3 that completely covers it.

In Fig. 2 such an arrangement is shown in Schratt, in which the quartz slide 3 on the entire Scope of the holding part 1 is attached.

<; & 09 580/446

Claims (3)

Another possibility is illustrated in FIG. 3, where only part of the support part is provided with damping compound so that it is completely covered even when the quartz layer is applied on one side. It is useful to completely enclose the damping layer in a quartz envelope, because this has the advantage of being able to use damping materials which otherwise would not be suitable for such purposes within the vacuum space without the protective quartz envelope. PATENT CLAIMS: 1. Waveguide operated in a vacuum, in particular in the form of a helical delay line For traveling wave tubes or the like. The holding parts of which are localized or distributed by the waveguide have damping masses separated by an insulating intermediate layer, characterized in that a thin, evenly distributed and them on the damping masses completely covering intermediate layer of quartz is applied firmly. 2. Waveguide according to claim 1, characterized in that the coating with a layer thickness from 0.1 to 1 μ is formed. 3. Waveguide according to claim 1 or 2, characterized in that the coating consists of an im Vacuum deposited quartz layer consists. Considered publications:
German Patent Nos. 898 190, 893 695;
French Patent No. 997 494;
U.S. Patent No. 2,626,371. 1 sheet of drawings © 8i) 9 580/446 7.5 »