Linear circular polarization conversion device

Abstract

The application discloses a linear circular polarization conversion device and belongs to the technical field of satellite communication and navigation. The device comprises a circular polarizer, a driving motor, a support mounting disc and a driven gear. The driven gear is fixed to the outer wall of the circular polarizer and coaxially connected with the circular polarizer. The driving motor is fixed to one side of the driven gear through a motor support. A driving gear is arranged on the output shaft of the driving motor, and the driving gear and the driven gear are engaged with each other. The circular polarizer is connected to the top of the support mounting disc through a rotary joint. The bottom of the motor support is fixed to the support mounting disc. When the driven gear rotates to the limit position, the micro switch and the limit contact block on the corresponding side are in contact. The application solves the problems of inaccurate polarization position and complex structure of the polarization conversion device of a feed source, and realizes linear circular polarization conversion of a satellite feed system conveniently by using a relatively simple structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of satellite communication and navigation technology, in particular to a linear-circular polarization device. BACKGROUND

[0002] In the field of satellite communication, there are both communication systems using circular polarization signal transmission and communication systems using linear polarization signal transmission in the same frequency band. In particular, in the C frequency band, both circular polarization state and linear polarization state are commonly used. Therefore, a linear-circular polarization conversion device is needed for one antenna to communicate with different satellites and signals with different polarizations.

[0003] The existing linear-circular polarization conversion device has various shortcomings.

[0004] It is difficult to position the polarization position. Usually, the circular polarizer or the orthogonal mode coupler in the feed system is rotated by 45 to realize linear-circular polarization switching of the system. When the cross polarization of the port is the smallest, the position of the circular polarizer is the linear-circular polarization position of the feed system. When the circular polarizer is rotated to the accurate position of linear polarization or circular polarization, the cross polarization of the system changes greatly, which is a very sharp drop peak. Therefore, it is required to accurately position the linear-circular polarization conversion position. The existing device has a single positioning mode and is not easy to achieve accurate positioning.

[0005] The polarization device has a complex structure. The linear-circular conversion of the feed system is only needed when the system works in different polarization states. Therefore, the working time of the polarization conversion device is relatively short, and even it does not need to work for several days or months. The torque required for rotating the circular polarizer or the orthogonal mode coupler is generally small. The existing system uses a normal gear box to arrange the driving gear and the driving motor, and the accurate positioning mechanism is also complex. SUMMARY

[0006] Therefore, the present application provides a linear-circular polarization conversion device. The present application solves the problem of inaccurate polarization position positioning or complex structure of the feed polarization conversion device, and conveniently realizes linear-circular polarization conversion of the antenna feed system by using a relatively simple structure.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] A linear-circular polarization conversion device, comprising a circular polarizer and a driving motor; further comprising a support mounting disc and a driven gear; the driven gear is fixed to the outer wall of the circular polarizer and coaxially fixedly connected thereto; the driving motor is fixed to one side of the driven gear through a motor support; a driving gear is arranged on the output shaft of the driving motor, and the driving gear and the driven gear are meshed with each other;

[0009] The circular polarizer is connected to the top of the support mounting disc through a rotary joint; the bottom of the motor support is fixed on the support mounting disc; the support mounting disc is further provided with a limiting support; the top of the limiting support is provided with a limiting contact block; the limiting contact block is two, and is distributed on the outer side of the driven gear; the upper surface of the driven gear is fixed with a micro switch; when the driven gear rotates to the limit position, the micro switch and the limiting contact block on the corresponding side are in contact.

[0010] Further, the driving motor is a direct current motor.

[0011] Further, the driven gear is part of a cylindrical gear, and has an arc structure.

[0012] Further, the limiting support is two, and the limiting support and the limiting contact block are one-to-one corresponding.

[0013] Further, the support mounting disc is provided with an arc-shaped hole for mounting the limiting support; the center of the arc-shaped hole is located on the central axis of the circular polarizer; the limiting support is fixed in the corresponding arc-shaped hole through a bolt, and the limiting support can move along the arc-shaped hole and change the mounting position.

[0014] Further, the contact surface of the limiting contact block and the contact surface of the micro switch are both arc-shaped smooth surfaces.

[0015] Further, the limiting contact block is a roller; the roller surface has a smooth convex protrusion parallel to the central axis to form a cam structure.

[0016] Further, the limiting support is a Z-shaped structure.

[0017] Further, the cross section of the limiting contact block is rectangular, and both ends of the rectangular have smooth arc-shaped transitions; the limiting contact block and the limiting support are connected through a through hole bearing located in the limiting contact block, the central axis of the through hole is parallel to the central axis of the limiting contact block, and the central axis of the through hole and the central axis of the limiting contact block have a spacing greater than 0.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The present application can adjust the limit position in a large range and accurately, mainly has two-stage position adjustment, the position of the polarizer needs to stop and limit, the trigger position of the limit switch itself has error, if only sliding fixed, it is not easy to fix to the required position, the position will change in the fastening process, or high-precision processing slide and related parts are needed, or only multiple fastening can be used, after fastening, if the test result is fixed to the exact position, it is ended, if not, it is tried again. For ordinary processing devices, the position of the sliding limit switch is determined first, and then a limit fine adjustment is added based on this, which is very convenient, which is the greatest advantage of the device. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural top view of an embodiment of the present application;

[0021] Figure 2 is a structural side view of Figure 1 ;

[0022] Figure 3 is a top view of the structure of another form of the present application;

[0023] Figure 4 is a structural side view of Figure 3 ;

[0024] Figure 5 is a structural section view of the motor and motor frame in Figure 1 ;

[0025] Figure 6 is a structural section view of the motor and motor frame in another form of the present application;

[0026] Figure 7 is a structural schematic diagram of one implementation of the micro switch in the embodiment of the present application;

[0027] Figure 8 is a structural schematic diagram of one implementation of the limit support in the embodiment of the present application;

[0028] Figure 9 is a structural schematic diagram of the driven gear in the embodiment of the present application;

[0029] Figure 10 is a structural schematic diagram of the installation of the limit support and the motor support on the network installation plate in the embodiment of the present application;

[0030] Figure 11 is an axial side schematic diagram of Figure 3 ;

[0031] Figure 12 is a structural schematic diagram of one implementation of the limit contact block in the embodiment of the present application.

[0032] Figure 13 is another implementation structure diagram of the limit contact block in the embodiment of the application.

[0033] In the figure: DC motor 6, micro switch 4, limit contact block 8, limit support 3, motor support 5, driving gear 10, driven gear 7, rotary joint 1, circular polarizer 2, bracket mounting disc 9. DETAILED DESCRIPTION

[0034] The technical solutions of the application are further described below in combination with the drawings and specific embodiments.

[0035] A linear-to-circular polarization conversion device, comprising a circular polarizer and a driving motor; further comprising a bracket mounting disc and a driven gear; the driven gear is fixed to the outer wall of the circular polarizer and coaxially fixedly connected therewith; the driving motor is fixed to one side of the driven gear through a motor support; a driving gear is arranged on the output shaft of the driving motor, and the driving gear and the driven gear are meshed with each other;

[0036] The circular polarizer is connected to the top of the bracket mounting disc through a rotary joint; the bottom of the motor support is fixed to the bracket mounting disc; a limit support is further arranged on the bracket mounting disc; a limit contact block is arranged on the top of the limit support; two limit contact blocks are arranged, and are distributed on the outer side of the driven gear; a micro switch is fixed to the upper surface of the driven gear; when the driven gear rotates to the limit position, the micro switch and the limit contact block on the corresponding side are in contact.

[0037] Further, the driving motor is a DC motor.

[0038] Further, the driven gear is part of a cylindrical gear and has an arc structure.

[0039] Further, the limit support is provided with two limit supports, and the limit supports and the limit contact blocks are one-to-one corresponding.

[0040] Further, an arc-shaped hole for mounting the limit support is arranged on the bracket mounting disc; the center of the arc-shaped hole is located on the central axis of the circular polarizer; the limit support is fixed in the corresponding arc-shaped hole through a bolt, and the limit support can move along the arc-shaped hole and change the mounting position.

[0041] Further, the contact surface of the limit contact block and the contact surface of the micro switch are both arc-shaped smooth surfaces.

[0042] Further, the limit contact block is a roller; the roller surface has a smooth protrusion parallel to the central axis, forming a cam structure.

[0043] Further, the limit support is a Z-shaped structure.

[0044] Further, the cross section of the limiting contact block is rectangular, and both ends of the rectangle have smooth arc transitions; the limiting contact block and the limiting support are connected through a through hole bearing in the limiting contact block, the central axis of the through hole is parallel to the central axis of the limiting contact block, and the central axis of the through hole and the central axis of the limiting contact block have a spacing greater than 0.

[0045] Further illustrated below are more specific embodiments.

[0046] Specific embodiment one: as Figure 1 , Figure 2 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12 One embodiment: in this embodiment, the DC motor 6 drives the circular polarizer 2 to rotate to realize the switching of the feed line polarization state and the circular polarization state, and the limiting contact block 8 rotating synchronously with the circular polarizer triggers the micro switch 4 to position the line polarization state and the circular polarization state position, which can be adjusted in a large range and finely adjusted in two stages.

[0047] As shown in Figure 7 and Figure 12 , the surface of the limiting contact block 8 in contact with the micro switch 4 is a smooth surface, and the center of the contact surface is the most protruding part, and the fixed position of the limiting contact block 8 can be adjusted.

[0048] Referring to Figure 10 , the limiting switch 4 is installed on the limiting support 3, and the limiting support 3 can slide along a certain trajectory to change the limiting position.

[0049] In this embodiment, the DC motor 6 is fixed on the motor support 5, and the motor shaft is provided with a driving gear 10, and the driving gear 10 installed on the motor support 5 is engaged with the driven gear 7 at the positioning position. After loosening the fastener, the motor support 5 can be moved from the positioning position, so that the driving gear 10 and the driven gear 7 are disengaged, which is convenient for debugging and testing.

[0050] In this embodiment, the driven gear 7 is concentric with the circular polarizer and is fixed together, and the driven gear 7 is part of a cylindrical gear. When the DC motor 6 rotates after the system fails and the micro switch fails, the driving gear 10 and the driven gear 7 are engaged with the missing part of the tooth surface, and the circular polarizer stops rotating.

[0051] Referring to Figure 12In the embodiment, the limiting contact block 8 is long strip-shaped, with a long hole in the middle for self-fixing and position adjustment. The contact end surface of the limiting contact block 8 is smooth and curved, and is symmetric along the center. The top of the end surface is flat and smooth. The limiting contact block is a cylinder, and the mounting and fixing hole of the limiting contact block is located on the center line of the cylinder inside, and has a certain distance from the center of the cylinder.

[0052] In Figure 12 the structure of the limiting contact block, the limiting contact block 8 is close to the most protruding part of the end surface of the micro switch 4. When the motor 6 still rotates in the case of system failure and micro switch failure, the limiting contact block 8 can pass through the micro switch 4, and the micro switch 4 will not be damaged.

[0053] Referring to Figure 3 , Figure 4 , Figure 11 and Figure 6 , the second embodiment of the overall structure is provided.

[0054] Referring to Figure 13 , the limiting contact block 8 does not touch the motor support 5 when it rotates with the driven gear 7. The limiting contact block 8 can be reversely touched and pass through the micro switch 4. The limiting contact block is a cam structure. Similarly, the limiting contact block 8 is close to the most protruding part of the end surface of the micro switch 4. When the motor 6 still rotates in the case of system failure and micro switch failure, the limiting contact block 8 can pass through the micro switch 4, and the micro switch 4 will not be damaged.

Claims

1. A linear-to-circular polarization conversion device comprising a circular polarizer and a drive motor; characterized in that, The support mounting disc and the driven gear are further included; the driven gear is fixed to the outer wall of the circular polarizer and coaxially connected with the outer wall; the driving motor is fixed to one side of the driven gear through the motor support; the output shaft of the driving motor is provided with a driving gear, and the driving gear and the driven gear are engaged with each other; The circular polarizer is connected to the top of the support mounting disc through the rotary joint; the bottom of the motor support is fixed to the support mounting disc; the support mounting disc is further provided with a limiting support; the top of the limiting support is provided with a limiting contact block; the limiting contact block is two, and is distributed on the outer side of the driven gear; the upper surface of the driven gear is fixed with a micro switch; when the driven gear rotates to the limit position, the micro switch and the limiting contact block on the corresponding side are in contact; The driving motor is a direct current motor; The driven gear is part of a cylindrical gear and has an arc structure; The limiting support is two, and the limiting support and the limiting contact block are one-to-one corresponding.

2. A linear circular polarisation conversion device according to claim 1, characterised in that, The support mounting disc is provided with an arc-shaped hole for mounting the limiting support; the center of the arc-shaped hole is located on the central axis of the circular polarizer; the limiting support is fixed in the corresponding arc-shaped hole through a bolt, and the limiting support can move along the arc-shaped hole and change the mounting position.

3. The linear circular polarisation conversion device of claim 1, wherein, The contact surface of the limiting contact block and the contact surface of the micro switch are both arc-shaped smooth surfaces.

4. The linear circular polarisation conversion device of claim 1, wherein, The limiting contact block is a roller; the roller surface has a smooth convex structure parallel to the central axis.

5. The linear circular polarisation conversion device of claim 1, wherein, The limiting support is a Z-shaped structure.

6. The linear circular polarisation conversion device of claim 1, wherein, The cross section of the limiting contact block is rectangular, and both ends of the rectangular have smooth arc-shaped transitions; the limiting contact block and the limiting support are connected through a through hole bearing located in the limiting contact block; the central axis of the through hole is parallel to the central axis of the limiting contact block, and the central axis of the through hole and the central axis of the limiting contact block have a spacing greater than 0.

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