RU210089U1 - HIGH POWER COAXIAL SWITCH - Google Patents

Abstract

The utility model relates to microwave technology, in particular to auxiliary devices for switching and interruption, and is intended for closing, interrupting or changing the signal path in coaxial paths. The technical result of the proposed utility model is the creation of a design of a coaxial microwave switch that would withstand a high power level (350-400 W) with low direct losses and have high reliability. The technical result is achieved by the fact that the coaxial microwave switch, which can withstand a high power level, consists of one input line (1) and two output lines (2, 3), which are coaxial and filled with a dielectric (4), for example, a tetrafluoroethylene polymer with a high dielectric permittivity. The input (1) and output lines (2, 3) are installed in the microwave part, which consists of a housing (5), a base (6) and two rectangular conductors (7). The central inner conductor (8) of the coax is made of beryllium bronze, which has good conductivity and high wear resistance. As a switching element, a coaxial line with a rectangular cross section of the outer screen and two rectangular conductors (7) is used. The coaxial line with a rectangular cross-section of the outer screen (body (5), base (6)) is covered with molybdenum (Mo), which has a low coefficient of secondary electron emission. The rectangular conductor (7), made of beryllium bronze, has the shape of a rectangular parallelepiped with radius edges and is coated with gold-cobalt (Au-Co) chemical composition, as well as the central inner conductor (7) of the input and output lines. Thanks to this coating, the contact resistance is reduced, the electrical parameters remain constant and wear resistance is increased. Rectangular conductors (7) are alternately pressed against the central inner conductors (8) of the output coaxial lines, or against the wide wall of the base (6). The rectangular conductor (7) pressed against the central inner conductors (8) serves as a transmission line, and the rectangular conductor (7) pressed against the wide wall of the base (6) serves as an additional matching element. The use of a rectangular metal conductor (7), which connects the coaxial channels to each other, is optimal from the point of view of the contact connection. The movement of rectangular conductors (7) is controlled by pushers (9), which are installed in the base together with springs (10), pins (11) are used as guides for rectangular conductors (7). Pushers and pins are made of polymer plastic, such as Zedex, which has high strength, heat resistance and dielectric constant. The pins (11) are in the form of a cylinder with a diameter expansion through a step, which are installed in the corresponding holes in the housing and base of the microwave part. 2 ill.

Description

The utility model relates to microwave technology, in particular to auxiliary devices for switching and interruption, and is intended for closing, interrupting or changing the signal path in coaxial paths.

A contact device is known that contains four contact groups that form a bridge circuit of closing and breaking contacts of the main and backup switching nodes, moreover, the diagonal of the bridge circuit of redundant closing contacts is connected to the diagonal of the bridge circuit of redundant breaking contacts [USSR author's certificate No. 535618].

The disadvantage of such a device is the large number of remote switches used.

A known design of a strip switch, which contains three transmission lines located on the fixed part of the switch, and a transmission line on the movable part, which can occupy one of two fixed positions and connect the transmission lines to each other on the fixed part, and the connection of the internal conductors of the lines located on of the fixed part of the switch, with the inner conductor of the line on the movable part, it is capacitive, since the internal conductors on the fixed and movable parts of the switch have "combs" at the ends, the teeth of which, interacting with each other, provide a capacitive connection of the transmission lines. [USSR author's certificate No. 236568].

This device has the following disadvantages: due to the fact that the cross section of the internal conductors of the lines is relatively small, the capacitance formed by the interaction of the "combs" on the movable and fixed conductors, even with very small gaps between the teeth, is small, which leads to a deterioration in the matching of the switch and a decrease in the magnitude of the transmitted power.

Also known is an invention containing three transmission lines with the same wave impedance, one of which is intended for the input of a microwave signal into the switch, the other two - for the first and second outputs of the microwave signals from the switch, as well as two key elements, respectively, for the first and second outputs switches operating in antiphase, two inputs for controlling key elements, three segments of the transmission line with a length equal to one eighth of the wavelength of the microwave signal, two resistors with a resistance equal to the wave impedance of the channels, while the first ends of the segments of the transmission lines are connected, respectively, to the input of the microwave signal, with the first and second outputs of the microwave signal, the second ends of the segments of the transmission lines through their resistors are connected to the housing [RF Patent No. 2479079].

The disadvantage of this invention, which uses two semiconductor transistors as key elements, is the relative complexity of its manufacture and relatively low reliability, as well as the lack of the necessary service indicating which output channel is currently operating.

A known design of a non-contact microwave switch with two positions, containing three or more transmission lines located on the fixed part of the switch, and one transmission line, made with the possibility of moving and fixing in one of two positions, in which there is a contactless connection of the transmission lines of the movable and fixed parts switch [RF Patent No. 2671339].

The disadvantage of this device is the excessive number of used transmission lines in the switch, which reduces reliability and increases the weight of the product.

The closest analogue of the proposed utility model is the design of a coaxial microwave switch, which contains three transmission lines with the same wave impedance, one of which is intended for the input of the microwave signal into the switch, the other two - for the first and second outputs of the microwave signals from the switch, as well as two key elements, respectively, for the first and second outputs of the switch, operating in antiphase [RF Patent No. 22671931.

The disadvantages of the invention are the relatively large weight and size characteristics and the relatively low speed of switching channels, since the key structural elements, which are holes and valves in the waveguide channels, are controlled electromechanically by acting on the valves and holes of the first and second switch outputs using a rod. From the point of view of the contact connection, the use of a cylindrical conductor (rod) is not optimal - a relatively small contact area can cause heating or even breakdown at high powers.

Known designs of coaxial microwave switches do not provide sufficient reliability at high conductive power. Increasing power can cause breakdowns.

The purpose of the utility model is to improve the performance of a coaxial microwave switch, such as conductive power and reliability.

The technical result of the proposed utility model is the creation of a design of a coaxial microwave switch that would withstand a high power level (350-400 W) with low direct losses and have high reliability.

The technical result is achieved by the fact that the coaxial microwave switch, which can withstand a high power level, consists of one input line and two output lines, which are coaxial and filled with a dielectric, for example, a tetrafluoroethylene polymer with a high dielectric constant. The input and output lines are installed in the microwave part, which consists of a housing, a base, and two rectangular conductors. The central inner conductor of the coax is made of beryllium bronze, which has good conductivity and high wear resistance. The switching element is a coaxial line with a rectangular outer screen and two rectangular conductors. The coaxial line with a rectangular cross-section of the outer screen (body, base) is covered with molybdenum (Mo), which has a low coefficient of secondary electron emission. The rectangular conductor, made of beryllium bronze, has the shape of a rectangular parallelepiped with radius edges and is coated with gold-cobalt (Au-Co) chemical composition, as well as the central inner conductor of the input and output lines. Thanks to this coating, the contact resistance is reduced, the electrical parameters remain constant and wear resistance is increased. Rectangular conductors are alternately pressed against the central inner conductors of the output coaxial lines, or against the wide wall of the base. A rectangular conductor pressed against the central inner conductors serves as a transmission line, and a rectangular conductor pressed against the wide wall of the base serves as an additional matching element. The use of a rectangular metal conductor, which connects the coaxial channels to each other, is optimal from the point of view of the contact connection. The movement of rectangular conductors is controlled by pushers, which are installed in the base together with springs; pins are used as guides for rectangular conductors. Pushers and pins are made of polymer plastic, such as Zedex, which has high strength, heat resistance and dielectric constant.

The pins are in the form of a cylinder with a diameter expansion through a step; they are installed in the corresponding holes in the housing and the base of the microwave part.

The proposed utility model is illustrated with the help of drawings.

In FIG. 1 is a cross section of a coaxial microwave switch;

in fig. 2 is an enlarged view of the microwave portion of the coaxial microwave switch.

Positions in the drawings indicate:

1 - input line;

2, 3 - output line;

4 - dielectric;

5 - body;

6 - base;

7 - rectangular conductor;

8 - central inner conductor;

9 - pusher;

10 - spring;

11 - pin.

Information sources:

1. USSR author's certificate No. 535618, IPC: H01H 47/00, published 11/15/1976

2. Author's certificate of the USSR No. 236568, IPC: H01R 1/12, published in 1969.

3. Patent of the Russian Federation No. 2267193, IPC: H01R 1/12, published on December 27, 2005.

4. Patent of the Russian Federation No. 2479079, IPC: H01R 1/15, published on April 10, 2013.

5. Patent of the Russian Federation No. 2671339, IPC: H01R 1/12, published on October 30, 2018.

Claims (1)

High power coaxial microwave switch, containing one input and two output lines, with two key conductor elements, characterized in that the dielectric has a central inner conductor made of beryllium bronze and plated with the chemical composition gold-cobalt (Au-Co ), which is installed in a housing connected to the base, and forms the outer screen of the coaxial line, coated with molybdenum (Mo); the case contains rectangular conductors in the form of a rectangular parallelepiped with radius edges, also made of beryllium bronze and coated with gold-cobalt (Au-Co) chemical composition; the movement of rectangular conductors is controlled by pushers made of polymer plastic, pushers are installed in the base together with springs; pins, also made of polymer plastic, are used as guide rectangular conductors; they are in the form of a cylinder with a diameter expansion through a step and are installed in the corresponding holes for the pins in the housing and base of the microwave part.

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