SU936050A1 - Broadband transformer - Google Patents

Description

one .

The invention relates to the field of radio engineering and can be used, in particular, as a broadband symmetric transformer. . Wide-band symmetric transformers with fractional transformation ratios, made on segments of two-wire lines, placed on the magnetic circuit Cl.

The disadvantages of these devices are their complexity, large size and limited working frequency band, due to the need for the two-wire lines of differing wave resistance and the large lengths of conductors connecting these two-wire lines to be separated on the magnetic circuit.

1 Most close to the proposed broadband symmetrical transformer containing two multi-wire lines, the ends of the first, second, third and fourth conductors

the first multi-wire line is connected respectively with the beginnings of the first, second, third and fourth conductors of the second multi-wire line, the ends of the first, second and third conductors of the second multi-wire line are connected respectively with the beginnings of the second, third and fourth conductors of the first multi-wire line 121.

to

The disadvantage of this transformer is its complexity, due to the need to carry out other-conductor lines with differing partial wave conductivities between adjacent conductors.

The purpose of the invention is to simplify the device without degrading its characteristics, in particular for one of the most commonly used resistance transformation coefficients close to two.

This goal is achieved by the fact that in a broadband transformer,

containing two multi-wire lines, the ends of the first, second, third and fourth conductors of the first multi-conductor line are connected respectively to the beginning of the first, second, third and fourth conductors of the second multi-wire line, the ends of the first, second and third conductors of the second multi-wire line are connected respectively to the beginning of the second, third and the fourth conductor of the first multi-conductor line, in each multi-wired line between its conductors shielded conductors connected along the entire length are introduced ki, thus beginning the shielding conductors in a first multiconductor line connected to the ends of conductors in the second shielding multiconductor line, wherein all the wave resistance lines formed by each of the conductors mnogoprovodnoylinii and its shielding conductor same.

FIG. Figure 1 shows the electrical circuit of the proposed device for a voltage transformer ratio of 4/3. FIG. 2 embodiment of the proposed device when using coaxial lines.

The device contains two multi-wire lines 1 and 2, while the ends of the first 1.1, second 1.2, third 1.3 and fourth 1.k conductors of the first multi-wire line 1 are connected respectively with the beginnings (the beginning is indicated by the point) of the first 2.1, second 2.2, the third 2.3 and fourth 2 . conductors of the second multi-conductor line 2, and the ends of the first 2.1, second 2.2 and third 2.3

conductors of the second multiwire

lines 2 are connected respectively to the beginning of the second 1.2, third 1.3 and fourth I. conductors of the first multi-wire line 1. In the multi-wire line 1, between its conductors 1.1, 1.2, 1.3 and 1.4, the shielding conductors are respectively 3.1, 3.2 and 3.3, which are interconnected by the entire length (or it is enough that their beginnings and ends are connected), and the second multi-wire line 2 is inserted between its conductors 2.1, 2.2, 2.3 and 2.4, the shielding conductors are 4.1, 4.2 and 4.3, respectively, which also

connected along the entire length. The beginning of the shielding conductors 3.1, 3.2 and 3.3 are connected to the ends of the shielding conductors 4.1, 4.2 and 4.3. Resistance of lines formed by conductor 1.1 and shielding conductor 3.1 by conductor 1.2 and shielding conductors 3.1 with 3.2, conductor 1.3 and shielding conductors 3.2 with 3.3, conductor 1.4 and shielding conductor 3.3, conductor 2.1 and shielding conductor 4.1, conductor

2.2 and shielding conductors

5 4.1 and 4.2, conductor 2.3 and shielding conductors 4.2 and 4.3, conductor 2.4 and shielding conductor 4.3 are equal to each other. Start Conductor 1.1 and End Conductor

0 ka 2.4 form an input pair of clips 5 and 6 with a symmetrical input resistance, and the end of the conductor 1.1 and the beginning of the conductor 2.4 form an output pair of clips 7 and 8, to which a balanced load with resistance is connected.

Conductors 1.1 - 1.4, as well as conductors 2.1 - 2.4 are formed by internal conductors of coaxial lines of equal characteristic impedance and equal length), the external conductors (screens) of which, combined along their entire length, form shielding conductors, respectively 3.1, 3.2,

3.3 and 4.1, 4.2 and 4.3. The device (see Fig. 2) works

in the following way.

The clips 5 and 6 receive oscillation, symmetrical relative to the beginnings of the shielding

conductors 3.1,3.2 and 3.3 and the ends of conductors 4.1, 4.2 and 4.3. This oscillation is divided equally between the lines formed by conductors 1.1 and 3.1, 2.4 and 4.3 (coaxial lines with internal conductors 1.1 and 2.4) and spreads along them. Reflection will not occur if the total characteristic impedance of both lines is equal to the internal

Claims (2)

0 generator resistance. After reaching the end of these lines, the oscillations enter the load connected to terminals 7 and 8j and partially to coaxial lines with internal conductors 2.1 and 1.4. These conductors are shielded, but the shield in this case serves to obtain the optimal value of the inductance of the conductors. Then oscillations come back to coaxial lines with internal conductors 1.2 and 2.3. The wave impedances of these lines are assumed to be the same as the lines with the inner conductors 1.1 and 2. The process of passing the oscillations is repeated. All conductors and lines, with the exception of lines with internal conductors 1.1 and 2.A, give parallel to the load connected to terminals 7 and 8 (no load is shown in the drawing), proper reactivity, providing a wide frequency band. With this design with integrated lines equal wave resistance achieves a wide frequency band. Thus, with an electric length of each coaxial line of 30 °, the reflection coefficient is small and does not exceed 0.025. . The result is a broadband symmetric transformer with a voltage transformation ratio equal to (i.e., a resistance transformation ratio close to two) and with a low reflection coefficient. With other transformation ratios; offsets from OTHER twists), the reflection coefficient of this scheme is significantly higher. The operation of the device of FIG. 1 is similar, and the structure is different in that the shielding conductors are not made coaxial, but, for example, flat, which gives freedom in the design. 9 0 Claims of the Invention A broadband transformer, mainly for symmetric transformation of voltage into D / 3 times, containing two multi-wire lines, the ends of the first, second, third and fourth conductors of the first multi-wire line are connected respectively to the beginnings of the first, second, third, and fourth conductors of the second multi-wire the lines, the ends of the first, second and third conductors of the second multi-wire line are connected respectively with the beginnings of the second, third and fourth conductors of the first many a wire line, characterized in that, in order to simplify the device, in each multi-wire line interconnected shielding conductors are inserted between its conductors, with the beginnings of the screening conductors in the first multi-wire line connected to; the ends of the shielding conductors in the second multi-wire line, and the characteristic impedances of the line formed by each of the multi-wire conductors and the conductor shielding it are the same. Sources of information taken into account in the examination 1. Devices for the addition and distribution of the power of high-frequency oscillations. Ed. Z.I. Model M., Sov. radio, 1980, fig. 11.26. 2. The same figure. 11.326.