Miniature three-channel radio frequency rotary joint

Abstract

The application discloses a miniature three-channel radio frequency rotary joint, which comprises a joint main body, the joint main body comprises three groups of channel units fixedly connected through bolts, and double-layer isolation sheets are arranged between the two adjacent groups of channel units; each group of channel units comprises a stator shell and a rotor shell, two insulators A are sleeved on the outer side end of each rotor shell, an outer conductor of a rotor cable is welded to each rotor shell, an inner conductor of the rotor cable is welded to a power distribution sheet, a side hole is arranged on the outer side surface of each stator shell, and an insulator B is arranged in each side hole. The working principle of the diplexer and the combiner is used to expand the bandwidth from the traditional 500MHz to 1.7GHz; the double-layer elastic isolation pieces are arranged between the two adjacent groups of channel units, so that the isolation degree is increased from 40-50dB to more than 55dB; the overall shell is made of aluminum alloy material, and the height of the single channel unit is not greater than 10mm, so that the miniature three-channel radio frequency rotary joint has the characteristics of small size and light weight.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microwave, in particular to a miniature three-channel radio frequency rotary joint. BACKGROUND

[0002] The microwave rotary joint is a connecting device for realizing the transmission of radio frequency signals between two relative rotating mechanisms, mainly used for continuously transmitting radio frequency signals from a rotating platform to a fixed platform during 360° continuous rotation. The microwave rotary joint includes a single-channel rotary joint and a multi-channel rotary joint. The commonly used three-channel rotary joint has a bandwidth of 500MHz, an isolation degree of 40-50dB between channels, and a large volume and weight. With the continuous development of the field of microwave technology, the development of antennas tends to be more and more multifunctional and miniaturized. Therefore, the low bandwidth, low isolation degree and large volume and weight cannot meet the demand, and thus the existing three-channel radio frequency rotary joint needs to be improved to meet the demand. SUMMARY

[0003] In view of the above technical problems in the related art, the present application provides a miniature three-channel radio frequency rotary joint, which can solve the above problems.

[0004] To achieve the above technical purposes, the technical scheme of the present application is as follows:

[0005] A miniature three-channel radio frequency rotary joint comprises a joint main body, the joint main body comprises three groups of channel units fixedly connected by bolts, and double-layer isolation sheets are arranged between adjacent two groups of channel units; each group of channel units comprises a stator shell and a rotor shell, two insulators A are sleeved on the outer side end of each rotor shell, an outer conductor of a rotor cable is welded to each rotor shell, an inner conductor of the rotor cable is welded to a power distribution sheet, a side hole is arranged on the outer side surface of each stator shell, an insulator B is installed in each side hole, a center needle is arranged in the center of each insulator B, a junction sheet is welded to one end of the center needle, and a stator cable is welded to the other end of the center needle; and the two ends of the joint main body are respectively connected with bearing assemblies A and B.

[0006] Further, the isolation sheets are annular, and a plurality of rectangular opening grooves are uniformly arranged on the inner side end of each isolation sheet.

[0007] Further, a limiting outer conductor is arranged at the outlet end of the side hole, the stator cable is arranged to pass out from the lower end of the limiting outer conductor, and a blocking sheet is arranged at the outer side opening of the limiting outer conductor.

[0008] Further, the bearing assembly B comprises a bearing B, a channel separation block is arranged in the bearing B, and the bearing B is connected with a flange plate B through a screw B and a pressing plate B.

[0009] Further, the bearing assembly A comprises a flange plate A, the bearing A is arranged in the flange plate A, and the bearing A is connected with the bearing seat through the screw A and the pressing plate A.

[0010] Further, the diameter of the flange plate A is larger than the diameter of the stator shell, and the outer circular end of the flange plate A is provided with an arc-shaped opening slot matched with the stator cable.

[0011] Further, the lower end of the flange plate A is connected with a shell A, the shell A comprises a cavity with an isosceles trapezoidal cross section, and the shell A is provided with a center through hole.

[0012] Further, the height of each group of the channel units is not greater than 10mm.

[0013] The present application has the following beneficial effects: the bandwidth is expanded from the traditional 500MHz to 1.7GHz through the working principle of the combiner and the combiner; the isolation degree is increased from 40-50dB to more than 55dB by adding the double-layer elastic isolation piece between the adjacent two groups of channel units; the overall shell is made of aluminum alloy material, and the height of the single channel unit is not greater than 10mm, which has the characteristics of small size and light weight. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0015] The present application will be further described in detail according to the drawings.

[0016] Figure 1 is a sectional view of a micro three-channel radio frequency rotary joint according to an embodiment of the present application;

[0017] Figure 2 is a top view of an isolation piece according to an embodiment of the present application.

[0018] In the drawings:

[0019] 1. Center pin; 2. Plug; 3. Limiting outer conductor; 4. Stator cable; 5. Housing A; 6. Bearing A; 7. Pressure plate A; 8. Flange A; 9. Stator housing; 10. Isolating plate; 10-1. Rectangular slot; 11. Rotor housing; 12. Insulator A; 13. Bearing B; 15. Pressure plate B; 16. Power divider; 17. Combining plate; 18. Insulator B; 19. Channel separator; 20. Rotor cable; 22. Bearing housing; 23. Rotor bolt; 24. Screw B. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0021] like Figure 1 As shown in the figure, a miniature three-channel radio frequency rotary joint according to an embodiment of the present invention includes a joint body, the joint body including three sets of channel units fixedly connected by bolts, and a double-layer isolation plate 10 is provided between two adjacent sets of channel units; each set of channel units includes a stator housing 9 and a rotor housing 11, two insulators A12 are sleeved on the outer end of each rotor housing 11, and an outer conductor of a rotor cable 20 is welded to each rotor housing 11. A power splitter 16 is welded to the inner conductor of the rotor cable 20. A side hole is provided on the outer side of each stator housing 9, and an insulator B18 is installed in each side hole. A center pin 1 is inserted through the center of each insulator B18. A combining piece 17 is welded to one end of the center pin 1, and a stator cable 4 is welded to the other end of the center pin 1; bearing assembly A and bearing assembly B are respectively connected to the two ends of the joint body.

[0022] In one embodiment of the present invention, the isolation plate 10 is annular, and a plurality of rectangular opening slots 10-1 are uniformly opened on the inner end of the isolation plate 10 so that the inner end has a certain amount of elasticity. The isolation plate 10 is double-layered, with the inner end set at the upper and lower ends of the rotor pressure plate and the outer end set at the connection of the two rotor housings 11.

[0023] In one embodiment of the present invention, the outlet end of the side hole is provided with a limiting outer conductor 3, the stator cable 4 passes through the lower port of the limiting outer conductor 3, and the outer side opening of the limiting outer conductor 3 is provided with a plug 2. The main function of the limiting outer conductor 3 and the plug 2 is to limit and fix the stator cable 4.

[0024] In one embodiment of the present application, the bearing assembly B includes a bearing B13, the bearing B13 is provided with a channel separation block 19, the bearing B13 is connected to the flange plate B through the screw B24 and the pressing plate B15.

[0025] In one embodiment of the present application, the bearing assembly A includes a flange plate A8, the flange plate A8 is provided with a bearing A6, the bearing A6 is connected to the bearing seat 22 through the screw A and the pressing plate A7.

[0026] In one embodiment of the present application, the diameter of the flange plate A8 is greater than the diameter of the stator shell 9, and the outer circular end of the flange plate A8 is provided with an arc-shaped opening groove matched with the stator cable 4.

[0027] In one embodiment of the present application, the lower end of the flange plate A8 is connected with a shell A5, the shell A5 includes a cavity with isosceles trapezoidal cross section, the shell A5 is provided with a central through hole, and the cavity of the shell A5 is used for mounting a matching element.

[0028] In the specific assembly of the present application, first, the bearing A6, the bearing seat 22, the flange plate A8, the pressing plate A7 and the shell A5 are sequentially assembled by using screws; second, the outer conductor of the rotor cable 20 is welded with the rotor shell 11, then passes through the insulator A12, the inner conductor of the rotor cable 20 is welded with the power divider 16, and finally passes through the insulator A12; this process is repeated three times to obtain three groups of components; third, the stator shell 9 is placed on the components of the first step, then one of the components of the second step is installed, and finally the isolation sheet 10 is placed, and this step is repeated three times to obtain the combined components of the rotor and the stator; fourth, the bearing B13, the pressing plate B15, the channel separation block 19 and the screw B24 are sequentially assembled, then pass through the coaxial cable of the rotor, and are connected with the combined components of the third step, and the rotor bolt 23 and the stator bolt are locked and fixed; fifth, the center needle 1 passes through the insulator B18 and is welded with the 17 combining sheet, then passes out of the side hole of the stator shell 9, the limiting outer conductor 3 is installed at the side hole of the stator shell 9 to limit the stator cable, the stator cable 4 is welded with the other end of the center needle 1, and finally the plug 2 is welded to the limiting outer conductor 3; sixth, the stator cable 4 is welded with the other end of the rotor cable 20 to a specified coaxial connector, and the assembly is completed.

[0029] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A miniature three-channel radio frequency rotary joint, characterized in that: The joint body includes three sets of channel units fixedly connected by bolts, with a double-layered isolation plate (10) between adjacent sets of channel units; each set of channel units includes a stator housing (9) and a rotor housing (11), with two insulators A (12) sleeved on the outer end of each rotor housing (11), and an outer conductor of a rotor cable (20) welded to each rotor housing (11), with a power distribution plate (16) welded to the inner conductor of the rotor cable (20). Each stator housing (9) has a side hole on its outer side, and an insulator B (18) is installed in each side hole, with a central hole through which a... There is a center pin (1), one end of which is welded with a connecting piece (17), and the other end of which is welded with a stator cable (4); the two ends of the joint body are respectively connected to bearing assembly A and bearing assembly B, the bearing assembly B includes bearing B (13), the bearing B (13) is provided with a channel separation block (19), the bearing B (13) is connected to flange B by screw B (24) and pressure plate B (15), the bearing assembly A includes flange A (8), the flange A (8) is provided with bearing A (6), the bearing A (6) is connected to bearing seat (22) by screw A and pressure plate A (7), and the height of each group of channel units is not greater than 10mm.

2. The miniature three-channel radio frequency rotary joint according to claim 1, characterized in that: The isolation plate (10) is annular, and a number of rectangular opening slots (10-1) are evenly provided on the inner side of the isolation plate (10).

3. A miniature three-channel radio frequency rotary joint according to claim 1, characterized in that: The outlet end of the side hole is provided with a limiting outer conductor (3), the stator cable (4) passes through the lower port of the limiting outer conductor (3), and the outer side opening of the limiting outer conductor (3) is provided with a plug (2).

4. A miniature three-channel radio frequency rotary joint according to claim 1, characterized in that: The diameter of the flange A (8) is larger than the diameter of the stator housing (9), and the outer end of the flange A (8) is provided with an arc-shaped opening groove that matches the stator cable (4).

5. A miniature three-channel radio frequency rotary joint according to claim 4, characterized in that: The lower end of the flange A (8) is connected to the housing A (5), which includes a cavity with an isosceles trapezoidal cross section and a central through hole at the center of the housing A (5).

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