RU2754065C1 - Medium power uwb coaxial fixed attenuator - Google Patents

Abstract

FIELD: attenuators.

SUBSTANCE: invention relates to attenuators. A medium-power ultra-wideband coaxial fixed attenuator consists of three sections connected in series, two of which are coaxial waveguides with connectors at the ends, and the third is formed by a central bushing with adjusting screws, compressed by the waveguide sections, in which a dielectric substrate is suspended in longitudinal grooves. The outer conductors are formed by the inner metal surfaces of the bushings-connectors, locating rings, central and clamping sleeves, and the inner conductors are formed by the outer metal surfaces of the rods included in the assemblies of the central conductors of the first and second segments of coaxial segments formed by the mounting rings in which dielectric support washers are coaxially installed with rods coaxially located in them, forming electromechanical contact with the ends of the dielectric substrate using coaxial-microplane transitions. The compression bushings with one end press the locating rings against the inner steps of the bush-connectors, while the others rest against the central bushing located in the through-stepped hole of the radiator housing.

EFFECT: expansion of the range of operating frequencies.

3 cl, 5 dwg, 2 tbl

Description

The technical field to which the invention relates

The invention can be used in the field of radar, radio navigation, communications, antenna-feeder systems and measuring equipment for attenuation of an electromagnetic wave in a coaxial path. State of the art

Known coaxial attenuator (application US 2010/0295637 A1 publ. 25.10.2010), including a central housing, inside which is placed a suspended resistive element on a dielectric substrate. Dielectric coaxial channels formed by bushings are screwed into the body, with the help of a thread, in which dielectric bushings are located, in which dielectric supports with central conductors are placed, which, at the point of contact with resistive elements, have spring-loaded ends, made directly from conductors.

The closest analogue is a fixed coaxial attenuator (USSR patent No. 1617496 publ. 10/17/1988), which is a waveguide channel formed by three segments, two of which (end coaxial connectors) are coaxial lines, the outer conductors of which are formed by stepped bushings, and the inner the conductors are fixed in them by means of washers. The coaxial sections are connected by a line segment with losses (dielectric plate with a thin-film topological pattern), fixed in a metal bushing installed between the stepped bushings.

The main disadvantages of these devices include a relatively small operating frequency range, a high level of return and throughput losses, as well as a low level of maximum dissipated power.

The essence of the invention

The technical result of the proposed solution is to expand the operating frequency range of the medium-power ultra-wideband coaxial fixed attenuator towards the microwave, reduce its return losses, and increase the level of maximum dissipated power.

The technical result is achieved due to the fact that the medium-power ultra-wideband coaxial fixed attenuator consists of three sections connected in series, two of which are coaxial waveguides with connectors at the ends, and the third is formed by a central bushing with adjusting screws, compressed by the waveguide sections, in which it is suspended in longitudinal slots dielectric substrate with a topological pattern applied to it.

The novelty is that the outer coaxial conductors of the device are formed by the inner metal surfaces of the bushings-connectors, locating rings, central and clamping sleeves, and the inner conductors are formed by the outer metal surfaces of the rods included in the assemblies of the central conductors of the first and second sections of coaxial segments formed by held in the inner stepped cavities of bush-connectors, adjusting rings, in which dielectric support washers are coaxially installed with rods coaxially located in them, forming electromechanical contact with the ends of the dielectric substrate using coaxial-microplane transitions, while threaded connections of bush-connectors and housing-radiator, clamping bushings with one end press the alignment rings to the inner steps of the bush-connectors, while the others abut against the central bushing placed in the through-stepped hole of the radiator body, forming a single wave gadfly channel.

The coaxial-microplane transition is made in the form of a spring-loaded end contact formed by a spring and a contact element or in the form of pins-transformers fixed on a dielectric substrate and a socket on the ends of the rods.

Brief Description of Drawings

Fig. 1 is a side sectional view of a medium power UWB coaxial fixed attenuator; Fig. 2 shows the lateral and cross-section of the attenuator section of the device, FIG. 3 shows a section B-B, FIG. 4 shows the assemblies of the central conductors with local cuts in the area of dielectric supports, in the area of the lamellas and in the area of the spring-contact connection of the central conductors, FIG. 5 shows a variant of connecting the central conductors of the device segments by a contact-pin method, with a local cut. The invention is also illustrated by tables. Table 1 shows the characteristics of a medium power UWB coaxial fixed attenuator having a cross section of 7 / 3.04 mm (range 0 - 18 GHz), Table 2 shows the characteristics of a medium power UWB coaxial fixed attenuator having a cross section of 3.5 / 1.52 mm (range 0-26.5 GHz).

FIG. 1-4 indicated:

1 - the first coaxial segment;

2 - the second coaxial segment;

3 - the third section of the channel;

4 - bushing-connector "fork" of the first coaxial segment;

5 - socket-connector "socket" of the second coaxial segment;

6 - adjusting rings;

7 - clamping bushings;

8, 9, 10 - rods;

11 - assembly of the central conductor of the first section of the channel

12 - assembly of the central conductor of the second section of the channel;

13 - dielectric support washers;

14 - central bushing;

15 - longitudinal grooves of the central sleeve;

16 - dielectric substrate;

17 - adjusting screws;

18 - radiator housing;

19 - threaded connection of the body and the sleeve-connector of the second segment;

20 - retaining ring;

21 - nut;

22 - pin;

23 - external thread of the sleeve of the connector of the second segment;

24 - brush contacts of the connector;

25 - springs;

26-pin element;

27 - brush contacts of the transition;

28 - transformer pins.

Implementation of the invention

The invention is a waveguide channel formed by three coaxial first and second end coaxial sections 1, 2 and the third section 3 connected in series. Sections 1 and 2 are round coaxial waveguides, the outer conductors of which are formed by the inner metal surfaces of the plug-4 and socket-connector bushings 5, adjusting rings 6, clamping bushings 7, and the central conductors are formed by the outer metal surfaces of the rods 8, 9, 10 included in the assemblies of the central conductor of the first and second 11 and 12 segments. In the holes of the adjusting rings 6, dielectric support washers 13 are held coaxially, in which the rods 8, 9, 10 are coaxially held. The third section 3 includes a central sleeve 14, the inner cylindrical, stepped metal surface of which is the outer conductor. A thin-film topological pattern applied to a dielectric substrate 16 suspended in the grooves 15 of the central sleeve 14 is the central conductor. In the central sleeve 14 there are perpendicular threaded holes in which screws 17 are screwed in to adjust the device.

The coaxiality of the conducting surfaces of the medium-power ultra-wideband coaxial fixed attenuator is ensured by the fact that the assemblies of the central conductors are placed in the inner cylindrical cavities of the connector bushings 4 and 5, resting on the inner step and centering the rods with the outer surface of the adjusting rings 6. One end face of the clamping sleeves 7 is coaxially placed in the inner cavities bush-connectors 4, 5, resting against the installation rings 6, their other end is placed in the internal through hole of the radiator housing 18 and abuts against the end of the central bushing 14.

Threaded connections 19 of the sleeve-connectors and the housing-radiator 18 provide a tight contraction of the device segments into a single channel.

The retaining ring 20, the nut 21, the bushing-connector 4 of the first section, the pin 22 of the rod 8 form a coaxial connector of the "plug" type.

Bushing connector of the second segment 5 with external thread 23 and brush contacts 24 of the rod 10, a coaxial connector of the "socket" type is formed.

The electromechanical connection of the central conductors of the channel parts is carried out using coaxial-microstrip transitions, structurally made either with the help of a spring-loaded end contact formed by springs 25 and a contact element 26, or by a contact-socket method - brush contacts 27 on rods 9 and pins-transformers 28, fixed on the board.

The design allows the assembly of medium power UWB coaxial fixed attenuators with various configurations of coaxial connectors: female-male, female-female, and male-male.

It has been experimentally verified that the proposed design makes it possible to create medium-power ultra-wideband coaxial fixed attenuators with the following operating frequency ranges: with a cross-sectional area of the air parts of the channel no more than 7 / 3.04 mm - 0 - 18 GHz; with a cross-sectional size of the air parts of the channel no more than 3.5 / 1.52 mm - 0 - 26.5 GHz.

In this case, the value of the reflection coefficients, the unevenness of the attenuation are largely determined by the topological pattern applied to the dielectric substrate, the maximum dissipated power of the devices is determined by the thermal conductivity of the dielectric substrate and the dissipation surface area of the radiator case.

The characteristics achieved on the basis of the inventive medium-power ultra-wideband coaxial fixed attenuator are summarized in Tables 1 and 2.

Table 1

Nominal attenuation, dB Attenuation unevenness, dB VSWR, no more Maximum power dissipation, W 3 ± 0.3 1,2 twenty 5 6 ten 15 twenty 25 thirty 40 ± 1 50

table 2

Nominal attenuation, dB Attenuation unevenness, dB VSWR, no more Maximum power dissipation, W 3 ± 0.5 1,3 12 5 6 ten 15 twenty 25 thirty 40

Claims (3)

1. Medium-power ultra-wideband coaxial fixed attenuator, consisting of three sections connected in series, two of which are coaxial waveguides with connectors at its topological pattern, characterized in that the external coaxial conductors of the device are formed by the internal metal surfaces of the bushings-connectors, setting rings, central and clamping sleeves, and the internal conductors are formed by the external metal surfaces of the rods included in the assemblies of the central conductors of the first and second segments of coaxial segments formed retained in the internal stepped cavities of the bush-connectors, the setting rings, in which the dielectric support washers are coaxially installed with the rods coaxially located in them, forming the electric tromechanical contact with the ends of the dielectric substrate using coaxial-microflat transitions, while by means of threaded connections of the bush-connectors and the radiator housing, the clamping bushings with one end press the alignment rings to the inner steps of the bush-connectors, and the others abut against the central bushing located in the through-stepped bore of the housing radiator, forming a single waveguide channel. 2. Medium-power ultra-wideband coaxial fixed attenuator according to claim 1, characterized in that the coaxial-microplane junction is made in the form of a spring-loaded end contact formed by a spring and a contact element. 3. Medium-power ultra-wideband coaxial fixed attenuator according to claim 1, characterized in that the coaxial-microplane junction is made in the form of transformer pins fixed on a dielectric substrate and a socket at the ends of the rods.

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