DE1801536A1 - Flexible waveguide - Google Patents

Description

TELEPOUNDS September 18, 1968

EE / PT-BK / Soh / Kö Patentverwertungsgesellschaft m.b.H. 92/68-BK

Flexible waveguide

The invention is concerned with a flexible waveguide for the simultaneous transmission of two mutually perpendicular linearly polarized electromagnetic waves, the effective inner cross-section of the waveguide is approximately square, with strongly rounded corners.

The increasing need for communication links makes it necessary to make multiple use of existing directional radio links « For this purpose, it is known to use an antenna of such a Directional radio link to transmit two different messages at the same time by having two perpendicular to each other uses polarized waves. To feed antennas operated in this way, two waveguide lines are therefore normally required necessary. If you make use of the fact that you are using a waveguide with a square cross-section can transmit two mutually perpendicular polarizations at the same time, the effort for one such a feed line is nevertheless relatively large, since several angles and bends are required with the straight lines Waveguide pieces are joined together by flange connections. In addition, every planned office of the Oesamt- -reflection factor of the feed line in an undesirable way elevated.

The aim of the invention is therefore to show βin · η waveguides «

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for the simultaneous transmission of two different Polarizations is suitable and the disadvantages mentioned above does not have,

According to the invention, this is achieved in that the waveguide is formed by a relatively thin, preferably seamless, metal tube is formed, the wall thickness along the continuous cross-sectional boundary is chosen so small that the required bending radius or torsion angle is achieved at symmetrical cross-sectional deformation to the mutually perpendicular standing cross-sectional axes.

On the basis of an exemplary embodiment shown schematically in the figure the invention is to be explained in more detail below.

The waveguide is preferably drawn by a seamless Aluminum tube is formed, the cross-section of which has, for example, the shape shown in the Pig. The internal cross-section of the Waveguide has a continuous border. The two mutually perpendicular cross-sectional axes A and B are the same size. The so-called corners of the inside cross-section are very strongly rounded, like the one marked with r Radius of curvature is indicated. So that the effective inside * cross section of the waveguide possible when bending or twisting is maintained, is the wall thickness of the waveguide; length of the cross-sectional boundary preferably selected differently '

92/68-BK 0 0 9 8 8 4/093 6 - ⁵ "

It is particularly advantageous to choose a greater wall thickness in the area of the rounded corners than in the area in between. In the illustrated embodiment, the minimum wall thickness designated by d ^ between the roundings merges continuously into the _{maximum wall thickness designated by d 2} in the area of the rounded corners.

The opposite inner sides of the waveguide cross-section can be used train in parallel. In a further development of the invention, it is also possible to use the sides of the inner cross-section to curve outwards symmetrically, as is the case in the illustrated embodiment.

The flexibility or twistability of such a waveguide is naturally greatest when it is kept the same size of the cross-section when its inner cross-section approaches the circular shape. The internal cross-section is used for such applications Choose only to deviate from the circle so far that undesired rotation of the fed-in shafts is avoided.

To achieve the necessary decoupling of the two perpendicular to each other Ensuring standing waves is important in the manufacture and installation of the waveguide ensure that the symmetry of its cross-section is disturbed as little as possible.

92/68-BK 00988 4/0936 .4-

A waveguide constructed in accordance with the present invention is simple in the form of a seamlessly pressed aluminum tube to manufacture. It can also be used as a feed waveguide for the antennas to quickly set up directional radio links Find use without the need for elbows, elbows and the like. this means a simple and quick assembly and the elimination of the reflection points of previously known feed lines that would have to be built up from several parts.

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Claims (1)

Patent claims: 1) Flexible waveguide for the simultaneous transmission of two linearly polarized electromagnetic waves standing perpendicular to one another, the effective internal cross-section of the waveguide is approximately square with strongly rounded corners, characterized in that the waveguide is formed by a relatively thin, preferably seamless metal tube, the wall thickness of which is chosen so small along the constant cross-sectional boundary that the required bending radius or torsion angle is achieved, with the most symmetrical possible cross-sectional deformation to the mutually perpendicular cross-sectional axes. 2) waveguide according to claim 1, characterized in that the wall thickness is different along the cross-sectional boundary is. 5) waveguide according to claim 2, characterized in that the wall thickness is greatest in the area of the rounded corners. 4) waveguide according to one of the preceding claims, characterized in that the opposite rare des Inside cross-section run parallel. 92/68-BK 009884/0936 ~ ⁶ " 5) waveguide according to one of claims 1 to 3 * characterized in that that the sides of the inner cross-section are curved symmetrically outwards. 6) waveguide according to claim 6, characterized in that the effective inner cross-section is only so far from the circular cross-section deviates so that undesired rotation of the fed-in shafts is avoided. 7) waveguide according to one of the preceding claims, characterized in that it consists of an aluminum tube . forms is. 92/68-BK 009884/0936