DE1640684C - Process for producing coaxial high-frequency lines with small cross-sectional dimensions - Google Patents

Description

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The invention relates to a method for the first time the production of coaxial high-frequency

Manufacture of coaxial high-frequency cables with small and very small cross-sectional dimensions

small cross-sectional dimensions, in which a wire gene for the purposes of data processing, the

larger diameter with a wrapper from aerospace and other fields of technology. the

a material with a higher melting point than 5 produced by the method according to the invention

that of the wire is provided and then in lines are characterized by good flexibility

heated state is pulled out. and with suitable dimensioning by relative

To hold the inner conductor centrically in good transmission properties.

The outer conductor of a coaxial line is known to be an important factor in the selection of the sheathing materials

Solid dielectric required. The introduction io ensure that both the procedural

this solid dielectric during the manufacturing technology as well as the electn. "technical facial

process in the outer conductor of the coaxial line points are taken into account.

prepares for large and medium cross-sections of coaxial lines no difficult- pulling process should be as viscous as possible, while with opportunities. For example, the wire and the temperature required for this are helical and Disk-shaped solid dielectrics on the inner layer - the metal layer - made of copper, for example applied and then these structures in the standing - already the melting point, but still Longitudinally slotted outer conductor introduced. Also can not have reached the boiling point because at a foamable plastic in not foamed-reaching the boiling point there is a risk that tem condition on the inner and / or outer conductor ao burst the sheaths. Likewise should be on it applied and after inserting the inner conductor in care that the materials of both Umden Longitudinally slotted outer conductor during or sheaths in their physical-mechanical Vernach Closing the slot will keep foamed about the same. Otherwise it can be exemplary. it is wise that when the

When producing coaxial lines smaller than 25 coaxial structures, there are different viscosities in the

Cross-sectional dimensions are these methods of setting wrappings and so when taking off the

Introduction of the solid dielectric, but not coaxial structure for the line, cracks in the

more suitable. So it is obvious that, for example, sheaths and thus short circuits in the lines

occur with an inner conductor diameter of a few. It is therefore best to be the easiest

tenth! or even hundredths of a millimeter to use the same material for both casings on this 30

neither broken open a coil nor used disks, although, as stated, possibly also

can be plugged in, as there is a risk of indoor use of different materials

The breakdown is great and exact guidance, with the necessary care, is quite the goal

such a thin conductor can lead concentrically to the outside.

conductors cannot be guaranteed with these means 35 From the electrical point of view, it is important to can. The lack of rigidity of such an inner that the coaxial line has the smallest possible transition but also prohibits the use of a damping system. Therefore, on foamable plastic as a dielectric, since most expedient at least for the dielectric There is no possibility of using a material with a small covering for the inner conductor during the foaming process in the outer conductor 40 dielectric constant and / or a small one to hold centrically. dielectric loss angle used. For this

When producing thin wires, it is known for reasons and taking into account the procedural

(German patent specification 977 307), wires with a technical condition is recommended at least

Diameter of a few millimeters with a covering for the covering serving as a dielectric, glass

To provide cladding made of a material with 45 to be used, in particular glass with a high

a higher melting point than that of the wire content of SiO ₂ .

exists, and the sheathing and the wire over the From the procedural point of view has that

for the materials customary hot-processing glass has the advantage that it is at the melting temperature

temperature and during that of copper - about 1090 ° C - still viscous

Heating that is made up of wire and sheathing. From the electrical point of view, it is a dielectric

Pull out standing structures in the axial direction. trikum well suited, especially if there is one

With the help of this process, in which the coating has a high content of SiO ₂ - silica -,

practically absorbs all tensile stresses, for example a type of glass with approximately 70% SiO ₂

since the heating temperature is mostly close to and about 30% NaCl at a frequency of

Melting temperature of the wire, it has been possible to achieve a relative dielectric constant of 55 1 MHZ

Wires with a diameter of a few thousand- ε, = 8.5 and a loss angle tan d = 40 · 10 " ³ .

th of a millimeter. With a type of glass made of approximately 91% SiO ₂ and

The object on which the invention is based, approximately 9% NaCl, is the corresponding

- Introduction of a solid dielectric in coaxial values at the same frequency: e, = 5.4 and

Lines with small cross-sectional dimensions - becomes 60 tan d = 13 · 10 ~ ^s .

now solved according to the invention in that the application of the sheath to the wire and A first sheathing serving as a dielectric, a metal layer, can be placed in front of the metal layer in various ways, and a second sheathing can be used thereupon. The simplest and most economical application, then this coaxial structure, is the covering warms and finally spraying the heated coaxial structure 6j onto the wire or the metal layer, until the desired cross-section has been achieved, for example with a suitable one for these purposes dimensions of the line is pulled out. Screw press. With such an application

The method according to the invention thus also ensures to a high degree that the

The sheaths are placed concentrically around the wire or around the metal layer.

The metal layer can be applied by vapor deposition, electroplating or spraying a metal solution, etc. can be made. Anyway, the simplest and cheapest method exists in applying a metal foil that covers the length of the envelope, which serves as a dielectric, to the envelope. In addition to a relatively high production speed, you get an electrically good in this way senior outer conductor.

Providing the finished coaxial line with a jacket can be omitted, since the already on the sheathing that is present in the metal layer can serve as a jacket. But if for whatever reason If an additional jacket is desired, this can be done, for example, by rinsing on a plastic mixture be applied.

Claims (5)

Claims: ao 1. Process for producing coaxial high-frequency lines with small cross-sectional dimensions, in which a wire mh a sheath made of a material with a higher melting point as provided as that of the wire and then drawn out in a heated state, characterized in that that a metal layer is applied to the first covering, which is used as a dielectric, and a second covering is applied to it, then this coaxial structure is heated and finally the heated coaxial structure until it is reached the desired cross-sectional dimensions of the line is pulled out. 2. The method according to claim 1, characterized in that the casings are sprayed on will. 3. The method according to claim 1 or 2, characterized in that glass is used for serving as the dielectric first envelope, with a high content of SiO ₂ . 4. The method according to any one of claims 1 to 3, characterized in that for both Wraps the same material is used. 5. The method according to any one of claims 1 to 4, characterized in that for the The metal layer forming the outer conductor uses a metal foil that covers the dielectric lengthways will.