SU76557A3 - Device for matching the resistances of two concentric lines - Google Patents

Description

A device for matching the resistances of two concentric lines, in order to connect two transmission line feeders with different impedances, is known.

According to the invention, both feeders are connected by segments of two or more concentric lines connected in series with one of the feeders, and in parallel with the other. At the same time, to prevent the possibility of short-circuiting one of the transmission lines, the length of the corresponding connecting segment is chosen equal to a quarter of the working wavelength.

FIG. Figure 1 shows the basic scheme for converting a push-pull system into a one-stroke one with an impedance ratio of 2: 1, explaining the principle of changing the pressure switch, and FIG. Figures 2 and 3 give examples of the interconnection circuits of two transmission lines, which ensure the impedance changes 4 and 9 times.

The concentric transmission line A (Fig. 1) consists of an inner conductor / and an outer 2. Both conductors of this line are connected from one end to the inner conductors 3 and 4 of two branches of a push-pull concentric line. The part of line A, equal to a quarter of the working wavelength, is enclosed in tube 6, which is connected to the outer conductors of 5 push-pull branches.

Since conductors 3 and 4 are connected in series with respect to line A, the impedance of each of them should be equal to half of the impedance of line A.

P1 using the described principle can be obtained when connecting two transmission lines, the desired change in impedance.

In the diagram, two branches consisting of inner conductors 3 and 4 and outer 5 are connected in parallel to the line B and in series to the line A. The length of the tube 7 is a quarter of the wavelength.

No. 76557

This scheme gives a change in the impedance 4 times, since the impedance in the line A is twice as large as the impedance of each of the branches, and the impedance of each branch, in turn, is twice as large as the source of the line B.

In the diagram of FIG. 3, three branches are used, connected in parallel to the line S and successively to the line L. Similarly to the previous one, a change in the impedand occurs 9 times in the section from line B to line L.

The basic principle behind all of these schemes is that the current passing through the inner conductor of one line can be made to go along the outer conductor of the other line. If there are no breaks in the current path, then such a system will act as an impedance transformer.

In order to provide the necessary phase relationships, additional line segments (and sockets, phases), whose length is equal to half the working wavelength, may be included between the individual connecting line segments or between one of them and the transmission line.

Subject invention

Claims (2)

I ,; A device for matching the resistances of two concentric lines, characterized in that the lines are connected by means of segments of two or more concentric lines connected to one of the lines in series and in parallel, and in order to prevent a short circuit from one of the lines, the length of the corresponding connecting segment is equal to a quarter of the working wavelength. 2. The device according to claim 1, characterized in that, in order to provide the necessary phase relationships, between the individual connecting line segments or between one of them and the transmission line, additional line segments are included, the length of which is chosen equal to half the working wavelength. five- FIG.