RU2649678C1 - Ultra-wide band coaxial phase shifter - Google Patents

Abstract

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio engineering, in particular to phase shifters. Ultra-wide-band coaxial phase shifter contains central and external conductors with sliding contacts. Two parts of a coaxial channel with the same wave impedance are formed by two central conductors, each of which is pressed into a dielectric bead pressed into a centering ring, and by the inner surfaces of the first and second connecting bushings, a bushing with lamellae and a tuning bushing. Along the length of the coaxial channel, the central conductors are provided with compensating shifts relative to the external conductors, at the places of sudden change of the latter. First connecting bushing is screwed into a cylindrical metal case on its one side, and on its other side, an adjusting nut is fixed by a locking ring, in which the tuning bushing is screwed, onto which the second connecting bushing is screwed. Through hole of the case is made with a step-changing diameter, the bushing with lamellae is pressed against the inner step of the case by the first connecting bushing through the first centering ring, the outer surface of the bushing with the help of lamellae forms a sliding contact of the external conductors with the inner surface of the tuning bushing. Second centering ring is pressed against the second connecting bushing by a tuning bushing.

EFFECT: expansion of the operating frequency range of the coaxial phase shifter.

1 cl, 4 dwg

Description

Application area

The invention can be used in the field of radar, radio navigation, communication, antenna-feeder systems and measuring equipment to create a phase shift of the microwave signal in the coaxial path, which can be changed over a wide range, with a small level of pass-through and return losses.

State of the art

Known coaxial phase shifter [US patent No. 8115570, 02/14/2012], which contains a metal housing with arbitrary cooling, forming an external conductor, in which a U-shaped inner conductor is located. The U-shaped inner conductor is made of a tube through which an internal coolant flows. To change the electrical length between the contact connectors of the inner conductor from the input and output ports, the length of the U-shaped inner conductor can be offset from the outside. The connecting parts of the inner conductor are located coaxially in the outer connecting flanges, which are in contact with the housing.

Known coaxial phase shifter from sections with different wave impedances, selected for the prototype [copyright certificate SU No. 120546, 01/01/1959], in which, in order to obtain constant wave resistance when changing phase, a variable-length section is performed with wave resistance equal to the wave resistance of the external line , the section with wave impedance other than the wave impedance of the line is a multiple of half the wavelength in the line.

The main disadvantages of these devices is a small range of operating frequencies and a high level of return and insertion loss.

SUMMARY OF THE INVENTION

The technical result of the proposed solution is to expand the operating frequency range of the coaxial phase shifter towards the microwave, reduce its return loss and expand the range of phase shift adjustment.

The technical result is achieved by the fact that in an ultrawideband coaxial phase shifter containing central and external conductors with sliding contacts, according to the proposed solution, two parts of the coaxial channel with the same wave impedance are formed by two central conductors, each of which is pressed into a dielectric washer, pressed into the centering ring, and the inner surfaces of the first, second connecting sleeves, a sleeve with lamellas and a tuning sleeve, and along the length of the coax of the central channel, the central conductors are equipped with compensation shifts relative to the external conductors, in the places of a sudden change in the latter, while the first connecting sleeve is screwed into a cylindrical metal casing on one side, and on the other side of the locking ring, a tuning nut is fixed, into which the tuning sleeve is screwed which the second connecting sleeve is screwed on, and the through hole of the housing is made with a stepwise changing diameter, the sleeve with lamellas is pressed against the inside to the lower step of the housing by the first connecting sleeve through the first centering ring, the outer surface of the sleeve using the lamellas forms a sliding contact of the external conductors with the inner surface of the tuning sleeve, the second centering ring is pressed against the second connecting sleeve by the tuning sleeve, which is made with an increase in the inner diameter in the region of the sliding contact of the central conductors, with each coaxial connector is formed by a corresponding Central conductor and connecting sleeve.

Brief Description of the Drawings

In FIG. 1 is a perspective view of a coaxial phase shifter; FIG. 2 shows a longitudinal section through the device; FIG. 3 shows a first central conductor with a local cut in the region of the first dielectric washer, FIG. 4 shows a second central conductor with a local cut in the region of the second dielectric washer and lamellas.

In FIG. 1-4 is indicated:

1 - metal case;

2 - a lock ring;

3 - tuning nut;

4 - the first connecting sleeve;

5 - the first Central conductor;

6 - the first dielectric washer;

7 - the first centering ring;

8 - nut of coaxial connector;

9 - sleeve with lamellas;

10 - sliding contact of the external conductors of the coaxial channel;

11 - tuning sleeve;

12 - sliding contact of the Central conductors of the coaxial channel;

13 - the second connecting sleeve;

14 - the second Central conductor;

15 - the second dielectric washer;

16 - the second centering ring;

17 - thread coaxial connector;

18, 19 - lock nuts.

The implementation of the invention

An ultra-wideband coaxial phase shifter of a coaxial design comprises a metal body 1 of cylindrical shape, on the external surface of which there is a thread and a recess in which a retaining ring 2 is mounted, which holds the adjusting nut 3. A through hole is made in the inner cavity of the housing 1 coaxially with the longitudinal axis and has a stepwise changing diameter and a thread into which the first connecting sleeve 4 is screwed, the inner surface of which is the external conductor of the coaxial channel. The first central conductor 5 is pressed into the first dielectric washer 6, which is pressed into the first centering ring 7 and is held coaxially with the through hole of the sleeve. The first connecting sleeve 4 by means of a threaded connection through the first centering ring 7 presses the sleeve 9 against the inner step of the housing 1 with stepwise varying external and internal diameters and lamellas curved from the axis of the sleeve. The outer surface of the sleeve 9 with the help of lamellas forms a sliding contact 10 of the outer conductors with the inner surface of the tuning sleeve 11, forming a continuation of the outer conductor of the coaxial channel. The inner cylindrical surface of the tuning sleeve 11 is made with an increase in diameter, to compensate for changes in wave resistance caused by an increase in the diameter of the second central conductor 14, in the region where the first central conductor 5 is inserted into it, thereby forming a sliding contact 12 of the Central conductors, and on the outer surface there is a thread on which the adjusting nut 3 is screwed. The adjusting sleeve 11 is screwed into the second connecting sleeve 13 into which the second centering ring is screwed 16. The second central conductor 14 is pressed into the second dielectric washer 15, which is pressed into the second centering ring 16. The socket and plug of the coaxial connectors are formed by the first connecting sleeve 4 with nut 8, the second connecting sleeve 13 provided with a thread 17, together with the corresponding central conductors 5 , fourteen.

The required phase shift of the microwave signal is adjusted by rotating the adjusting nut 3, as a result of which the adjusting sleeve 11 is displaced together with the second connecting sleeve 13 relative to the housing 1, while the length of the coaxial channel changes while maintaining a coordinated electrical contact between the central and external conductors, due to sliding lamella connection. Lock nuts 18 and 19 provide immobility of the tuning nut 3 and the electromechanical stability of the device.

The inventive ultra-wideband coaxial phase shifter provides the expansion of the operating frequencies in the direction of the microwave, reducing return loss and expanding the range of adjustment of the phase shift.

The following frequency dependences were obtained experimentally:

- operating frequency range from 0 to 32 GHz;

- phase shift from 0 to 230 degrees;

- the transmission coefficient is not worse minus 0.4 dB (at any phase shift);

- return loss is not worse minus 20 dB (at any phase shift).

Claims (1)

An ultra-wideband coaxial phase shifter containing central and external conductors with sliding contacts, characterized in that the two parts of the coaxial channel with the same wave impedance are formed by two central conductors, each of which is pressed into a dielectric washer, pressed into the centering ring, and the inner surfaces of the first, second connecting bushings, bushings with lamellas and tuning sleeve, the central conductors provided with compensation along the length of the coaxial channel shifts relative to the external conductors, in the places of a sudden change in the latter, while the first connecting sleeve is screwed into a cylindrical metal case on one side, and on the other side of the locking ring, a tuning nut is fastened into which a tuning sleeve is screwed onto which the second connecting sleeve is screwed moreover, the through hole of the housing is made with a stepwise varying diameter, the sleeve with lamellas is pressed against the inner step of the housing by the first connecting sleeve h cut the first centering ring, the outer surface of the sleeve with the help of lamellas forms a sliding contact of the external conductors with the inner surface of the tuning sleeve, the second centering ring is pressed against the second connecting sleeve by the tuning sleeve, which is made with an increase in the inner diameter in the area of the sliding contact of the central conductors, each coaxial the connector is formed by a corresponding central conductor and a connecting sleeve.

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