A flexible antenna feed connector with adaptive low-frequency alternation of hot and cold

Abstract

The utility model provides an antenna flexible feed connector that is adaptive to low-frequency alternation of hot and cold, and is composed of a crimping terminal, a flexible braided copper mesh tube, and a 3M polyimide insulating tape adhered to the surface. By folding the two ends of the flexible braided copper mesh tube and inserting them into the crimping terminal, reliable assembly is achieved by using tooling stamping and forming, and the phenomenon of scattered wires, messy wires, and excess materials at the ends of the flexible braided copper mesh tube is prevented. With the help of tooling, the arc segment of the flexible braided copper mesh tube is formed, and thermal deformation is fully released to ensure that the structure is intact after multiple reciprocating cycles. The utility model changes the rigid connection mode of the feed connector into a flexible connection mode, and uses the characteristics of low rigidity and easy deformation of the flexible structural parts to improve the stress concentration phenomenon of the rigid connector, thereby increasing the fatigue life of the component and reducing the difficulty of process manufacturing.

Description

Technical Field

[0001] The utility model belongs to the technical field of antennas, and in particular relates to an antenna flexible feeding connector capable of adaptively changing low-frequency cold and hot frequencies. Background Art

[0002] The dual-polarized log-periodic antenna is usually located at the top of the relative dipole antenna. Figure 1 The rigid cross-interconnected feeding structure shown in the figure realizes the unbalanced-balanced conversion of the broadband feeding mode. In order to achieve the high gain and low loss design requirements, the logarithmic periodic antenna feeding mode adopts the air coaxial structure.

[0003] like Figure 3 , Figure 4 As shown, in the space working environment, the inner conductor 5 of the logarithmic periodic antenna is a coaxial line, and the outer conductor 6 is a collective line. The average temperature difference between the inner and outer conductors is large, and the feed connector 4 located at the top of the antenna works in a specific hot and cold alternating environment. The task requires that the feed connector 4 needs to maintain its structure intact after withstanding tens of thousands of hot and cold alternating shocks. Calculations show that since the stress on the existing feed connector 4 far exceeds the allowable value of ordinary materials, a large thermal displacement will be formed at the feed connector 4; after testing, the limit of the number of reciprocating cycles of the existing feed connector 4 in the sliding direction of the inner conductor caused by thermal displacement is only a few dozen times, and it will break after reaching the limit. Figure 2 As shown, it is impossible to meet the fatigue life requirement of tens of thousands of times in the entire life cycle. Utility Model Content

[0004] The utility model aims to solve the problem that the feeding connector at the top of the antenna is subjected to large thermal displacement due to the large temperature difference between the inner and outer conductors of the extravehicular antenna in the orbital working state, and cannot meet the high fatigue times requirement. For this purpose, a flexible feeding connector for the antenna with adaptive low-frequency alternation of hot and cold is provided.

[0005] The technical solution provided by the utility model is:

[0006] An adaptive low-frequency alternating hot and cold flexible feeding connector for antennas, which is special in that:

[0007] Includes flexible braided copper mesh tube and two crimp terminals;

[0008] The flexible braided copper mesh tube comprises an arc segment located in the middle and overlapping segments located at both ends;

[0009] The overlapping sections at both ends of the flexible braided copper mesh tube are assembled in the crimping terminals;

[0010] The length of the arc segment is greater than the distance between the two crimping terminals at maximum thermal displacement.

[0011] Furthermore, the overlapping sections at both ends of the flexible braided copper mesh tube are folded in reverse and then assembled in the crimping terminals respectively.

[0012] Furthermore, the number of copper wires in the overlapping sections at both ends of the flexible braided copper mesh tube is the same.

[0013] Furthermore, the flexible braided copper mesh tube is double-layered, and part of the outer surface of the flexible braided copper mesh tube is adhered by insulating tape to avoid contact with other parts in the assembly space to cause a short circuit.

[0014] Furthermore, the insulating tape is a polyimide insulating tape.

[0015] Furthermore, the two crimping terminals are thin-walled rectangular tubes.

[0016] Furthermore, the flexible braided copper mesh tube is woven with silver-plated copper wires.

[0017] The concept and principle of this utility model:

[0018] Flexible structure and Ω shape design description: When the product is in orbit, the on-orbit thermal analysis results show that there is a large temperature difference between the inner and outer conductors of the antenna. Under the constraint conditions at both ends of the inner conductor, high thermal stress will be generated. According to the calculation based on the inner conductor length of 1.5m, 3.04mm thermal displacement will be generated.

[0019] Therefore, in order to ensure that the feeding connector connected to the top of the inner conductor fully releases thermal displacement, the feeding connector of the utility model is designed in an "Ω" shape, and the rigid structure is changed to a flexible structure. The characteristics of the flexible structure with low rigidity and easy deformation are used to improve the stress concentration phenomenon of the connector, thereby increasing the fatigue life of the feeding connector and reducing the process tolerance.

[0020] Description of the reverse folding structure design: Due to the cross-weaving process of the braided copper mesh tube, the restraint force between the braided wires is relatively small. As a result, when the flexible braided copper mesh tube end is assembled, if the structure is directly installed in the crimping terminal, after the feeding connector has undergone multiple thermal displacements, the force-bearing area of ​​the end braided wire is small, and it is very easy to have loose wires, causing the flexible structure to fail. In addition, since the feeding connector is assembled in a compact space, it is easy for the inner and outer conductors to be conductive after loose wires, which ultimately leads to single-point failure of the antenna polarization.

[0021] Therefore, the braided copper mesh tube of the utility model adopts a reverse folded double-layer assembly structure, which effectively improves the assembly constraint force of the braided wire at the end of the braided copper mesh and effectively avoids the phenomenon of loose wires. In addition, since the antenna adopts a dual-polarization working mode, the feeding point needs to use a "cross" assembly of two flexible feeding connectors, and the connectors need to be short-circuited; and in order to prevent the flexibility of the feeding connector from being damaged, it is only necessary to insulate part of the surface of the braided copper mesh tube.

[0022] The advantages of the utility model are:

[0023] 1. The utility model changes the rigid connection structure of the feed connector into a flexible connection structure, and utilizes the characteristics of the flexible structure with low rigidity and easy deformation to improve the stress concentration phenomenon of the rigid connector, thereby increasing the fatigue life of the component.

[0024] 2. The utility model uses a closed double-layer copper mesh tube formed by weaving as the main component, which realizes adaptive adjustment under large thermal displacement, while ensuring the fatigue life requirements of the product, improving the product's adaptability to temperature change environments, ensuring the normal and reliable operation of the antenna, and expanding the operating temperature adaptation range of the logarithmic periodic antenna.

[0025] 3. The utility model has a simple structure, excellent ductility and molding processability, and meets the requirements of high fatigue times, and can adapt to working requirements in large temperature difference environments.

[0026] 4. The utility model can completely replace the rigid feeding connector at the top of the antenna. The thermal deformation of the shape has little effect on the electrical performance of the antenna, meeting the requirements for the stability of the electrical performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 : Schematic diagram of existing rigid cross-interconnection feeding structure;

[0028] Figure 2 : Schematic diagram of the fracture of the existing rigid cross-interconnection feeding structure;

[0029] Figure 3 : Structural diagram of the inner and outer conductor feeding points at the top of the existing antenna;

[0030] Figure 4 : Flexible feeder connector structure assembly cross-sectional view;

[0031] Figure 5 : Front view of the flexible feed connector structure;

[0032] Figure 6 : Top view of the flexible feed connector structure;

[0033] Figure 7 : Schematic diagram of flexible feed connector assembly;

[0034] Figure 8 : Top view of the inner and outer conductor assembly at the top of the antenna;

[0035] Fig. 9 : Physical picture of flexible feed connector;

[0036] In the figure: 1- crimping terminal; 2- flexible braided copper mesh tube; 3- insulating tape; 4- feeder connector; 5- inner conductor; 6- outer conductor; DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] like Figures 5 to 7 As shown, this embodiment provides an adaptive low-frequency alternating cold-hot antenna flexible feeding connector:

[0039] Specifically comprising a flexible braided copper mesh tube 2 and two crimping terminals 1;

[0040] The flexible braided copper mesh tube 2 comprises an arc segment in the middle and overlapping segments at both ends;

[0041] The two ends of the flexible braided copper mesh tube 2 are folded in reverse and respectively assembled in two crimping terminals 1, so that the overlapping sections at both ends of the flexible braided copper mesh tube 2 are gathered into a folded double-layer structure, which increases the force-bearing area of ​​the braided copper mesh tube and effectively improves the assembly constraint force between the wires at the end of the braided copper mesh tube, making it less likely for loose wires to appear at the end of the flexible braided copper mesh tube 2.

[0042] If the end of the braided copper mesh tube 2 is directly installed in the crimping terminal, the cross-weaving process of the braided copper mesh tube will make the restraining force between the braided wires smaller, resulting in the braided wires at the end of the feeding connector becoming thinner and the force-bearing area becoming smaller after multiple thermal displacements, which is very likely to cause loose wires and cause failure of the flexible structure. In addition, since the feeding connector is assembled in a compact space, the inner and outer conductors are likely to be conductive after loose wires, which ultimately leads to single-point failure of the antenna polarization.

[0043] The number of copper wires in the braided copper mesh tube at the overlapping sections at both ends is the same, and the overlapping sections at both ends are respectively inserted into the rectangular holes of the crimping terminal 1, and the copper wires of the braided copper mesh tube are evenly distributed on both sides of the assembly hole of the crimping terminal 1 using a cone needle, and then the crimping terminal 1 is reliably assembled with the overlapping sections at both ends of the braided copper mesh tube and the braided wire density of the overlapping sections at both ends of the flexible braided copper mesh tube 2 is the same through stamping, so as to ensure that the braided wire is subjected to uniform force from the crimping terminal to the greatest extent, and prevent the occurrence of scattered wires, messy wires, excess materials, etc. at the end after repeated bending due to too few braided wires at one end of the flexible braided copper mesh tube 2, and at the same time provide an external mechanical interface for antenna assembly.

[0044] When the maximum thermal displacement occurs in the middle arc segment of the flexible braided copper mesh tube 2, since the length of the arc segment is greater than the distance between the two crimping terminals 1, the middle arc segment of the flexible braided copper mesh tube 2 arches in an "Ω" shape, ensuring that the flexible braided copper mesh tube 2 converts the thermal deformation into the "Ω"-shaped deformation of the arc segment, so that the flexible braided copper mesh tube 2 will not be disconnected under force, and the feeding connector can adapt to the maximum thermal deformation caused by the temperature difference between the inner and outer conductors.

[0045] The flexible braided copper mesh tube 2 is double-layered, and the two crimping terminals 1 are thin-walled rectangular tubes. The rectangular cross-section of the rectangular tube ensures that the braided wires on the same plane in the crimping terminal 1 are evenly stressed. The crimping terminal 1 is made of gold-plated copper, and is initially a thin-walled round tube. The thin-walled round tube is preformed into a rectangular cross-section by tooling stamping to avoid stamping cracking and have a good shape-retaining function.

[0046] like Figure 3 , Figure 8 As shown, when two feeding connectors 4 are used at the top of the antenna for dual-polarization assembly, the arc segments of the two feeding connectors 4 are arched in opposite directions.

[0047] like Figures 5 to 7 As shown, part of the outer surface of the flexible braided copper mesh tube 2 is adhered by amine insulating tape 3 to avoid contact with other parts in the assembly space and cause short circuit; since the flexibility of the flexible feed connector needs to be retained, only part of the outer surface is insulated.

[0048] The insulating tape 3 of this embodiment is a polyimide insulating tape. The actual picture of the flexible feed connector is as shown in FIG. Fig. 9 shown.

[0049] The flexible braided copper mesh tube 2 of this embodiment is woven with silver-plated copper wire, which is used to reduce resistance to improve the performance of the feed connector 4. At the same time, the operator can also ensure the ductility parameters of the feed connector 4 by adjusting the weaving pitch, which is suitable for a variety of different types of feed connections.

[0050] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. An adaptive low-frequency alternating hot and cold flexible feeding connector for antennas, characterized in that: Includes flexible braided copper mesh tube and two crimp terminals; The flexible braided copper mesh tube comprises an arc segment located in the middle and overlapping segments located at both ends; The overlapping sections at both ends of the flexible braided copper mesh tube are assembled in the crimping terminals; The length of the arc segment is greater than the distance between the two crimping terminals at maximum thermal displacement.

2. According to claim 1, the adaptive low-frequency alternating hot and cold flexible feeding connector for antennas is characterized by: The overlapping sections at both ends of the flexible braided copper mesh tube are folded in reverse and then assembled in the crimping terminals respectively.

3. The adaptive low-frequency alternating hot and cold antenna flexible feed connector according to claim 2, characterized in that: The number of copper wires in the overlapping sections at both ends of the flexible braided copper mesh tube is the same.

4. The adaptive low-frequency alternating hot and cold antenna flexible feed connector according to claim 2, characterized in that: The flexible braided copper mesh tube is double-layered, and part of the outer surface of the flexible braided copper mesh tube is adhered by insulating tape to avoid contact with other parts in the assembly space to cause a short circuit.

5. The adaptive low-frequency alternating hot and cold antenna flexible feed connector according to claim 4, characterized in that: The insulating tape is a polyimide insulating tape.

6. The adaptive low-frequency alternating hot and cold antenna flexible feed connector according to claim 2, characterized in that: The two crimping terminals are thin-walled rectangular tubes.

7. The adaptive low-frequency alternating hot and cold antenna flexible feed connector according to claim 2, characterized in that: The flexible braided copper mesh tube is braided with silver-plated copper wires.

Images