DE1259981B - Coupling window for maximum frequency energy - Google Patents

Description

EDITORIAL

H03h
German class: 21a4-74

Number: 1259 981

File number: E 25453IX d / 21 a4

Filing date: September 3, 1963

Open date: February 1, 1968

The invention relates to a coupling window for high-frequency energy of high power made of insulating material, at least on one side a thin conductive coating for dissipation from itself on the surface the window has accumulating electrical charges.

It is common practice to use ultra high frequency energy from an evacuated ultra high frequency generator, for example a magnetron, by means of an output waveguide via a coupling window of suitable Remove insulation material. However, the problem arises that such coupling windows accumulate electrical charges that cause a high power transmission at high frequencies Can reach value at which sudden discharges take place that lead to breakdowns. This risk of sudden breakdowns Discharge of static electrical charges on a coupling window for high frequency energy represents a undesirable limit for the possible application of such windows in terms of power and frequency represent.

There is already a coupling window known, in which to derive each on the surface Window side charges accumulating on both sides of the window a thin conductive coating is applied is. With this arrangement it is possible to prevent breakdowns on the coupling window, but by attaching the conductive coverings it must be accepted that on the basis of the existing ones Discontinuity in the line, significant reflection losses occur. These undesirable Effects of conductive coatings can be achieved by special devices such as cylindrical inductive Fingers are reduced, but these measures are cumbersome and expensive, as such Fingers must be attached in a very special way and extremely precisely.

The aim of the invention is to create a simply constructed coupling window for ultra-high frequency energy great power that does not cause reflection loss and where there is a risk of occurrence from breakdowns caused by the sudden discharge of static electrical charges.

According to the invention, this is achieved in a coupling window of the type mentioned at the outset by that the conductive coating in the form of thin, in a known manner substantially perpendicular to Lines running in the direction of the high-frequency electric field component on the window surface is upset.

According to the invention, in the case of a Kreisför coupling window for ultra-high frequency energy

Applicant:

English Electric Valve Company Limited, London

Representative:

Dr. W. Müller-Bore, Dipl.-Ing. H. Gralfs,

3300 Braunschweig, Am Bürgerpark 8,

and Dipl.-Phys. Dr. rer. nat. G. Manitz,

8000 Munich 22, Robert-Koch-Str. 1,

Patent attorneys

Named as inventor:

Alan Hugh Pickering, Springfield, Chelmsford;

Frederick Charles Thompson,

Arthur James Young, Danbury, Essex

(Great Britain)

Claimed priority:

Great Britain October 1, 1962,

dated June 28, 1963 (37029) -

Migen window for maximum frequency energy in E ₀₁ mode, in which the electric field in the window plane runs radially, at least on one side of the window a spiral-shaped conductive coating is applied.

In the case of a circular window for maximum frequency _{energy in the H 01} mode, in which no radial component occurs in the plane of the window, a conductive coating consisting of a number of radially extending lines is applied to at least one side of the window.

For maximum frequency _{energy in the H n} mode, according to the invention, the conductive coating is applied in the form of straight lines which run perpendicular to the plane of electrical polarization.

The conductive coating is dimensioned so that the high-frequency losses are low and reasonable HF voltage is maintained at the window. Suitable materials for the coverings according to the invention are colloidal graphite and metal, which by means of a suitable process, for example by

709 747/205

brushed or sprayed on. It is always important to ensure that the Coating formed conductors run as perpendicular as possible to the electric field lines to the absorption to reduce high-frequency energy and thus the occurrence of S losses as much as possible.

Further details and advantages of the invention are explained below with reference to the drawing. The invention is used in the case of windows for circular waveguides described.

1 shows in a conventional manner the course of the electric field in the plane of the window of a circular waveguide which is operated _{in the E 01 mode;}

F i g. Figure 2 is a view of a window according to the invention for such a ladder;

F i g. 3 shows in a similar way the course of the electric field in the plane of the window of a circular waveguide _{which is operated in the H 01} mode, and FIG

Fig._4 shows the view of an inventive Window for this case.

In Fig. 1, the arrowed dashed lines represent the electric field in a circular waveguide 1, which is operated in the E ₀₁ -MMe. According to the invention, the window is on one or both sides, as shown in FIG. 2, with a thin spiral Cover 2, for example made of colloidal graphite or metal, provided. In Fig. 2 shows the covering on only one surface of the window.

The arrow lines in FIG. 3 show the course of the electric field in a waveguide 1 which is operated _{in the H 01 mode.} In this case, a covering 3 made up of radially extending lines, as shown in FIG. 4, is used. As in FIG. 2, only one-sided covering is shown, although both sides of the window can be provided with a covering.

Coverings are provided on both window surfaces. see, these are generally similar, however this is not a necessary condition.

Claims (7)

Patent claims: 1. Coupling window for high-frequency energy of high performance made of insulating material that is at least on one side a thin conductive coating to dissipate itself on the surface the window has accumulating electrical charges, characterized in that that the conductive coating in the form of thin, in a known manner substantially perpendicular to Lines running in the direction of the high-frequency electric field component on the window surface is upset. 2. coupling window according to claim 1, characterized in that the in the form of thin lines trained conductive covering is attached to both sides of the window. 3. coupling window according to claim 1 or 2 for maximum frequency _{energy in the E 01} mode, characterized by at least one spiral-shaped conductive coating. 4. coupling window according to claim 1 or 2 for maximum frequency _{energy in the H 01} mode, characterized by at least one conductive coating, which consists of a number of radially extending lines. 5. coupling window according to claim 1 or 2 for maximum frequency _{energy in the H 1] L} mode, characterized by at least one conductive coating in the form of straight lines which run perpendicular to the plane of electrical polarization. 6. coupling window according to one of the preceding claims, characterized in that the conductive material is graphite. 7. coupling window according to one of the preceding claims, characterized in that the Conductor formed by the conductive coating as perpendicular as possible to the electrical field lines get lost. Considered publications:
German Auslegeschrift No. 1 065 035;
French Patent No. 1295 748;
U.S. Patent No. 2,990,526. 1 sheet of drawings 709 747/205 1.68 ® Bundesdruckerei Berlin