DE2353648A1 - DC-FREE CONNECTION FITTINGS FOR HIGH-FREQUENCY LINES - Google Patents

Description

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DIPL. IKG. DIETSiCH LOCALB 2353648

F 833O ΡΑΙΕΛ-ΤΑ NWAiT

8 MUNICH <10

IBIBMAIiEK STHASSE, 6

IiES ClBIES DE LYON 170 Avenue Jean Jaures, 69353 LYON CEDEX 2, (France)

DIRECT CURRENT-FREE CONNECTION FITTINGS FOR HIGH-FREQUENCY LINES

The invention relates to a direct current-free connection fitting for high-frequency lines such as those in the form of composite waveguides _y coaxial lines or flexible waveguides.

High-frequency lines with a simple geometric cross-sectional shape, for example circular, right-angled, Elliptical or oval conductors and those with standardized dimensions can easily be connected to each other with the help of at their ends welded mounting clamps are connected. If the lines have different dimensions, this makes it easier an intermediate piece the connection. With complicated cross-sectional

409822/0727 originally inspected

on the other hand, it is hardly possible to shape in a suitable manner Welding a connection clamp onto the outer conductor. To circumvent this difficulty, the outer conductor has so far been bent up perpendicular to its axis, after previously a transition piece was attached to this conductor. Then you have contact between this bent band and the Transition piece made. Unfortunately it is always difficult to make the mechanical contact between these two parts correctly, because the bending up cannot be carried out with sufficient geometric accuracy. The only in approximately flat shape ensures only a poor and imprecise electrical transition.

The aim of the invention is to match this with that of transmission lines to fix incompatible technical part required for high-frequency signals reliability.

For this purpose, space is provided between the end of the line and the transition part, in order to create a wave trap to form, which is to ensure the current transfer, while bores in the transition part η it the interconnected " Lines should form matching transformers connected in series.

The essence of the invention is to create a space between the transition part and the end of the line, whose radial dimension is equal to a quarter of the wavelength and that with a circular groove thereof

409822/0727

Longitudinal depth in the transition part in connection if this fut is with holes in this transition part Row arranged; whose cross-sections are based on those of the lines to be connected to each other are determined and the matching transformers form "

To better understand the invention and its advantages an exemplary embodiment is described in more detail with reference to the accompanying drawings

Figure 1 _e shows a partial longitudinal section through a valve erf ± ndungsgemässe _o

FIG. 2 shows a cross section through the transition part along the arrow II in FIG. ₀ 1 after the fitting has been dismantled, _o

Fig «, 3 shows a cross section along the arrow III after removal of the welded clamp,

According to FIG. 1 belong to a semi-rigid waveguide 1 two elements, namely a metallic waveguide 2 and an outer plastic envelope 3, which is a compact Form unity. The cross-section of the metallic, not visible here With its flattened shape, the waveguide represents a compromise between the characteristics of circular and rectangular Waveguides represent »Its cross-section is determined by its two extreme dimensions, those on its axes of symmetry are measured, which are called the large or small cross-sectional axis * The minor axis is created by the

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Flatten a circular cross-section. Such a conductor is used to transmit electromagnetic waves, whose wave type is the TE-1O type of right-angled conductor and corresponds to the TE-c-II type of elliptical ladder.

The end of the line 1 is freed from its insulating sleeve over a short distance. At this point it will a Bndstuck.4 put on the head, the holes so it is provided that, on the one hand, the conductor 2 can be inserted into the end piece 4 up to the stop seine.Hülle 3, on the other hand the sheath 3 is also inserted into the end piece. In this stop position, the conductor 2 is bent back onto the end piece 4 and thus forms a practically flat flange 5, the greatest width of which lies in the plane of the figure. A transition piece 6 has a longitudinally extending circular hat 7 which opens into an intermediate space 8, which during assembly between Flange 5 and an end face 9 of the transition piece 6, which is opposite it, is created.

The dimensions of the groove 7 and the space 8 are the same and are chosen so that between the conductor and the intermediate piece 6, the current transfer is guaranteed. The hat 7 and the gap formed by the space 8 create an electromagnetic trap. For this purpose, the longitudinal dimensions of the groove 7 and the radial dimensions of the space 8 is approximately equal to a quarter of the middle

4098 22/0 72 7 ./.

Wavelength of the frequency band to be transmitted , the width of the groove 7 is, for example, two millimeters, that of the space 8 is half a millimeter, in order to create a suitable bandwidth for a frequency range between 6 and 7> 5 Cfigaherz.

In this way you put between the transition piece and the flange produces an electrical transition without mechanical contact. Since the surface of the flange 5 is not uniform it would be difficult to establish mechanical contact with constant ohmic resistance; on the other hand impaired the irregularity of this surface in none Way electromagnetic trap working. Of course, the possible contact of the section 10 of the transition part plays 6 with the outer circumference of the flange 5 no bolls, because it is parallel to the electromagnetic trap.

In addition, three sealing rings are provided to to ensure the tightness of the valve and to keep the overpressure in the interconnected cables constant keep. A sealing piece 11 is installed in the space between the end piece 4 and - the conductor 1. The tightness between the transition piece 16 and the interconnected cables is on the one hand at the level of the end piece 4 by the insertion of a seal 12, the position of which by the for this purpose in the End piece 4 provided groove is set, and on the other hand by the insertion of a flat seal 15 at the height of the flank

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which on the end of the standard cable 13 _{f of} a right-angled conductor, welded cable clamp 14 guaranteed.

The assembly of the connection fitting is carried out alternatively in two ways; Each cable is attached to the transition part 6 with the aid of screws 16, which are guided through holes 17 drilled into the transition part and evenly distributed in it be attached; with the help of guided through the transition part Screws 18 can also clamp 14 and end piece 4 darch tightening the nuts 19 at the same time on the transition piece 6 can be printed. Of course, when assembling the according to the invention any other known assembly method applied / earthed.

In Fig. 2 it can be seen that the bore 20 of the transition part 6 for impedance matching has a cross section, which lies within the dashed cross section 20a of the conductor 2 of the waveguide 1; their length is about a quarter of the wavelength, whereby a so-called quarter-wave transformer is formed with the waveguide.

In FIG. 3 it can be seen that the bore 21 belonging to a right-angled waveguide 13 is a right-angled one Has cross-section, the corners are slightly rounded and the length with the help of the known impedance of the waveguide 1 was calculated, the cross section 21a of which is shown in dashed lines.

409822/0727

In this way, two impedance transformers are connected in series with the wave trap; but their number can be higher if the differences between the two high-frequency lines to be connected are greater than in the given example or if a larger frequency bandwidth is necessary »

In order to increase the bandwidth, nonhomogeneous ones can also be used Transformers are provided, the bandwidth of which is about 15% is less than 1.02 with a standing wave ratio, as is the case with the conductor 14 matching transformer is whose cross-section 20 is considerably smaller than that of the bore 20a; on the other hand, the matching transformer of the, Conductor 1 homogeneous, since the cross-sections 21 and 21a practically coincide.

The materials of the various components of the fitting are made taking into account those to be joined together Lines selected. The clamp 14, which is welded onto the aluminum waveguide 13, is made of an aluminum alloy manufactured. The transition part 6 consists of metal and is protected against corrosion either by a suitable coating or protected by the choice of a stainless alloy; the end piece 4 can be made of any material be. In the exemplary embodiment, polyethylene was selected, i.e. the same material from which the sheath 3 of the composite waveguide is made 1 exists.

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In the context of the invention, any desired sealant can be selected to protect the fitting against the ingress of moisture to protect and to ensure a loss-free internal pressure.

The bending up of the conductor can also be avoided by placing the conductor at the level of the end of the end piece 4, which is shown in FIG in this case made of metal, is cut through and the space between the transition piece and the end piece to form the wave trap can be used. The electrical contact between the outer conductor and the end piece is produced in this case by any known means, in particular by that the rear end of the end piece is pressed onto the conductor. For this purpose, the end piece is equipped with longitudinal slots Mistake.

- Patent claims -

409822/0727

Claims (1)

PATENT CLAIMS ι ι (IJ DC-free connection fitting for high-frequency lines, e.g. hollow or coaxial conductors, with a transition piece placed between a clamp or end piece pushed onto the lines to be connected, characterized in that the end of the outer conductor of one of the two lines is separated from the transition part ( 6) is separated by an intermediate space (8) which belongs to a wave trap, and in that this wave trap is arranged in series with matching transformers, which are formed by inner bores of the transition element and the outer ones with detti Conductors of the lines interact. Ζ ,, connection fitting according to claim 1, characterized in that the end of the outer conductor to the front; of the corresponding end piece (4) is bent up and that the wave trap is formed from the space (8) lying between the flange (5) obtained in this way and the transition piece (6), the radial length of which corresponds to a quarter wavelength and the one with a circular one Groove (7) of the same depth in the longitudinal direction is connected, which is incorporated into the transition part. 3. Connection fitting according to claim 1, characterized in that the outer conductor in height the front of the metallic end piece is cut through 409822/0727 a / c and that the wave trap from the between the front end of the End piece and the transition part lying intermediate space is formed, the radial length of which is equal to a quarter wavelength and that having a circular groove of the same depth in the longitudinal direction is in connection, which is incorporated into the transition part. 4 09822/0727 ORIGINAL INSPECTED