SU1756980A1 - Coaxial switch - Google Patents

Abstract

The use of a coaxial switch can be used in microwave technology for switching coaxial transmission lines and provides broadband on of a coaxial line and increased isolation when it is turned off. The switch contains an input and output coaxial line 1 with two electromagnets (4) installed on them. M) 2, the center conductor 3 of these lines, consisting of the input and output segments, supported by two dielectric washers 4, installed with an interval of 5 between them, in which the electrical conductive magnetic fluid (EMF) 6 A third E / M 7 with a magnetic conductor 8, located between the first two E / Ms, whose magnetic field is perpendicular to the axis of the coaxial transmission line, was introduced. In turn-on mode, the goal is achieved by the formation of an EMF using an E / M 2 switching element with an impedance equal to the impedance of the lines to be switched on, and in disconnection mode by short-circuiting the inside of the outer conductor of a coaxial transmission line, performed by an EMF using M 3 3 Il 6 E 4 (L O H 00 O S rig.1

Description

The invention relates to the field of radio engineering, to coaxial nodes of the microwave range, namely to switching devices of coaxial lines.

The purpose of the invention is to increase the broadband ™ of the switched on transmission line and discharge when it is turned off.

Figure 1 and 2 shows the included coaxial switch, a longitudinal section; Fig 3 - the same cross section.

On the outer conductor 1 of the coaxial line (Fig. 1), made of a diamagnetic material, electromagnets 2 are installed axially with the coaxial line 2. The inner conductor 3 of the coaxial switch consists of input and output pieces made of a diamagnetic material. In the break, dielectric washers 4 s cylindrical depressions between which a magnetically controlled element is disposed in cavity 5, in which electrically conductive magnetic fluid 6 is used. Perpendicular to the axis is coaxial a switch, symmetrically with respect to the electromagnets 2, with a gap between them, a third electromagnet 7 is installed, the poles 8 of which are placed on the outer conductor 1 of the coaxial line, while the axis of the poles 8 of the electromagnet 7 passes through the plane of symmetry of the gap and crosses the longitudinal axis of the coaxial line (Fig 3) .

Coaxial switch operates in two modes

In the mode of the included coaxial line, the voltage is applied to the spectromagate 2, the field of which is summed, and along it along the axis of the coaxial line between the dielectric washers 4 an electrically conductive magnetic fluid is created, connecting the segments of the inner conductor 3 of the coaxial line. Together with the outer conductor 1, a coaxial line is formed line with an impedance equal to the impedance of the input and output lines, and the microwave signal without loss and reflections from the input to the output line. The voltage on the third electromagnet 7 in this case is not applied (Fig. 1).

In the line shutdown mode, the voltage is applied to the third electromagnet 7 with the magnetic core 8, which covers the line where there is no dielectric, and the voltage is removed from the electromagnets 2. The electrically conductive magnetic fluid 6 is disposed along the magnetic field of the electromagnet 7 in such a way that it turns off the central conductor of the coaxial

line and bridges the outer conductor 1 of the coaxial line, shielding the center conductors of the 3 lines and increasing the separation between the input and output

coaxial lines (Fig 2)

Example For a coaxial line with a standard cross section of 7 / 3.04, the switch will have the following main dimensions: 3 mm distance between dielectric washers; the diameter of the hole in the dielectric is 2.15 mm; fluoroplastic 4, 0 + 0.1 was used as the dielectric; the length of the cylindrical cavity in the dielectric, intended for filling with an electrically conductive magnetic fluid, is 2 mm; the inner diameter of the outer conductor is 7 mm; its outer diameter is 10 mm, the material is brass with a silver coating; the outer diameter of the inner conductor in the absence of a dielectric is 3.04 mm, and in the dielectric its diameter is 2.15 mm; The conductor is made of material - brass with silver coating. Two electromagite, mounted coaxially on

The outer conductor has an outer diameter of 26 mm and a width of 20 mm. The third (disconnecting) electromagnet, installed perpendicular to the axis of the coaxial line, has an outer diameter of 20 mm and is wound on

5x5 mm magnetic core, covers a coaxial line in the center between two dielectric washers and electromagnets, the distance between which is 5 mm. All electromagnets are wound

wire sew-2 with a diameter of 0.36 mm

The amount of electrically conductive magnetic fluid filling the space between the dielectric washers is determined from the Ratio of diameters in an air-filled coaxial line, i.e. the ratio of diameters is 2.3 for a line with a characteristic impedance of 500 m, which is defined by

Z

60

-7-1P

VF

D / d

where Z is the wave resistance of the coaxial line;

D is the inner diameter of the outer conductor of the coaxial line;

d is the outer diameter of the inner conductor of the coaxial line;

Ј - relatively dielectric permeability of the material filling the line

Claims (1)

Invention Formula A coaxial switch containing a segment of a coaxial transmission line, the inner conductor of which is made with a gap in which two dielectric washers are installed, a magnetically controlled element placed in a cavity formed by cylindrical recesses made in the inner conductor on both sides of the gap, and holes of dielectric washers, with the first and second electromagnets axially cut off a coaxial line, characterized in that, in order to increase the broadband ™ transmission lines and times viscous, dielectric washers are installed symmetrically with respect to the first and second electromagnets with a gap between them, a third electromagnet is introduced, the poles of which are placed on the outer conductor of the coaxial line, while the axis of the poles of the magnets passes through the plane of symmetry of the gap and intersects the longitudinal axis of the coaxial line, and An electrically conductive magnetic fluid was chosen as the magnetically controlled element. / V Fie.Z