Strong vibration resistant satellite-borne high-gain axial-mode helical antenna

Abstract

The present invention provides a high-gain axial mode helical antenna resistant to strong vibrations, and relates to the field of antenna technology. The axial mode helical antenna comprises: a thin-walled support structure, a radome and a helical wire; the thin-walled support structure comprises: a central sleeve, a rib plate and an arc plate; the helical wire is installed on the thin-walled support structure, and the thin-walled support structure is fixedly installed in the radome; the thin-walled support structure adopts a configuration with high bending load-bearing efficiency, which can reduce the dependence on high-rigidity and high-strength materials. The structure adopts a two-dimensional weaving process to meet the needs of engineering use. Compared with the current antenna support tube formed by an expensive three-dimensional weaving process, the cost of the satellite-borne helical antenna can be significantly reduced; and the thin-walled support structure significantly improves the antenna vibration fundamental frequency and the root stress during the vibration process under the premise of controlling the weight, and additionally enhances the system's bearing capacity and the bending strength of the cantilever root.

Description

Technical Field

[0001] The invention relates to the field of antenna technology, and in particular to a strong vibration-resistant satellite-borne high-gain axial mode helical antenna. Background Art

[0002] Axial mode helical antennas have circular polarization directional characteristics and are widely used in the field of satellite communications. Helical antennas are installed on satellite platforms and inevitably experience harsh mechanical environments such as vibration, noise, impact, acceleration, etc. during the satellite launch phase; on the other hand, in order to pursue longer range and higher signal quality, helical antennas are required to have sufficient length to produce higher gain, making the structural rigidity problem of high-gain helical antennas in harsh vibration environments more prominent.

[0003] The mechanical environment resistance design methods commonly adopted by helical antennas include: using higher-strength materials or advanced composite materials to improve structural strength; increasing the shell wall thickness or designing the antenna to be low to increase the structural fundamental frequency and avoid vibration coupling; conducting targeted vibration reduction design and adding additional vibration reduction structural parts; conducting structural topology optimization design and reasonably distributing materials to improve structural rigidity, etc.

[0004] For satellite-borne high-gain axial-mode helical antennas, the structure presents the characteristics of a large cantilever. Under harsh vibration environments, the deformation of the antenna cantilever and the stress at the cantilever root become significantly larger, so that conventional wave-transmitting composite material processes cannot meet the structural strength requirements. At present, engineering designs have to adopt three-dimensional woven high-strength composite material support structures, but this causes a sharp increase in the design cost of the antenna array. In order to meet the requirements of strong vibration resistance and low cost for satellite-borne high-gain helical antennas, it is urgent to make novel designs for the antenna structure to adapt to the rapid development of satellite-borne communication radars.

[0005] Invention patent 201410541750.X discloses a satellite-borne helical antenna, which improves the stiffness of the helical antenna by adding a connecting block between the helical wire and the outer conductor of the antenna. This patent differs from this patent in the design principle of the antenna's mechanical environment resistance structure: the cited patent proposes placing a connecting block between the helical wire and the outer conductor along the antenna axis, so that the helical wire and the outer conductor of the antenna can better coordinate movement, which has a certain inhibitory effect on the deformation of the antenna. However, in this design, the connecting block only plays a connecting role and is not a load-bearing structure itself. It does not increase the stiffness of the antenna. Faced with large cantilever satellite-borne helical antennas with increasingly higher gain indicators, the deformation suppression effect obtained by this method is difficult to meet engineering applications. On the other hand, this patent cannot solve the problem that the root of the large cantilever helical antenna is prone to breakage in harsh vibration environments.

[0006] This patent proposes a method of using a thin-walled rib structure to support the outer conductor of the helical antenna and the antenna grounding base to improve the overall stiffness and strength of the antenna. The principle is that the thin-walled rib structure is a light-weight, highly efficient load-bearing structure. Through design, the bending section coefficient of the helical antenna cantilever can be significantly improved, achieving a significant increase in the specific stiffness of the helical antenna and a significant reduction in the vibration stress at the root of the cantilever. In addition, the use of this mechanical environment resistant structure design method can break through the current engineering design's reliance on expensive three-dimensional woven composite material technology, expand the material selection to conventional two-dimensional woven composite materials, significantly reduce the manufacturing cost of satellite communication antennas, and facilitate engineering applications. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the shortcomings of the prior art, the present invention provides a high-gain axial-mode helical antenna resistant to strong vibrations, which solves the problems of large cantilever axial-mode helical antennas with large antenna deformation and easy breakage at the root of the cantilever under harsh vibration environments, and breaks the antenna's dependence on expensive composite material processes, thereby significantly reducing the antenna manufacturing cost.

[0009] (II) Technical solution

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] A high-gain axial-mode helical antenna resistant to strong vibrations, comprising a thin-wall support structure, a radome and a helical wire;

[0012] The thin-walled support structure includes: a central sleeve, a rib plate and an arc plate; a plurality of rib plates are arranged in a circular array on the outer wall of the central sleeve, an arc plate is arranged on the outer side of the rib plate, and the arc plate is fitted with the inner wall of the antenna cover; the rib plate is provided with a plurality of first mounting holes for the spiral line to pass through, the spiral line is installed on the thin-walled support structure through the first mounting holes, and the thin-walled support structure is fixedly installed in the antenna cover.

[0013] Preferably, the thin-wall support structure is integrally formed of a wave-transparent two-dimensional woven glass fiber reinforced composite material.

[0014] Preferably, the axial mode helical antenna further comprises: a bottom slot;

[0015] A second mounting hole is provided on the side wall of the bottom groove, a third mounting hole is provided on the bottom of the arc plate, and a fourth mounting hole is provided on the bottom of the antenna cover. The second mounting hole, the third mounting hole and the fourth mounting hole are connected correspondingly to realize a fixed connection between the bottom groove, the thin-wall support structure and the antenna cover.

[0016] Preferably, a mounting groove is provided on the lower surface of the bottom plate of the bottom groove, and a first through hole, a second through hole and a threaded blind hole are provided in the mounting groove;

[0017] Preferably, the axial mode helical antenna further comprises: an outer conductor;

[0018] The outer conductor comprises: a metal rod and a chassis;

[0019] The chassis is fixed to the end of the metal rod, and the head end of the metal rod passes through the first through hole and the central sleeve in sequence;

[0020] The chassis is provided with fifth mounting holes corresponding one to one with the threaded blind holes. The chassis is accommodated in the mounting groove and is connected and fixed via the fifth mounting holes and the threaded blind holes.

[0021] Preferably, a plurality of first weight-reducing grooves are provided on the lower surface of the bottom plate of the bottom trough; and a plurality of second weight-reducing grooves are provided on the bottom surface of the chassis.

[0022] Preferably, the upper surface of the chassis is provided with pillars corresponding to the second through holes one by one; the pillars are connected to the first transition connector after passing through the second through holes;

[0023] The first transition connector has a support hole on its bottom surface, a first pin hole on its top surface, and a first spiral hole in communication with the first pin hole on its side surface;

[0024] The support is fixedly connected to the support socket. After the end of the spiral wire is inserted into the first spiral wire socket, a pin is inserted into the first pin hole to achieve fixed connection between the spiral wire and the first transition connector.

[0025] Preferably, the top side wall of the metal rod is connected to a second transition connector, the top surface of the second transition connector is provided with a second pin hole, and the side surface is provided with a second spiral wire insertion hole connected to the second pin hole; after the head end of the spiral wire is inserted into the second spiral wire insertion hole, a pin is inserted into the second pin hole to achieve a fixed connection between the spiral wire and the second transition connector.

[0026] (III) Beneficial effects

[0027] The present invention provides a high-gain axial-mode helical antenna on board a satellite that is resistant to strong vibrations. Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, the axial mode helical antenna includes: a thin-walled support structure, an antenna cover and a helical wire; the thin-walled support structure includes: a central sleeve, a rib plate and an arc plate; a plurality of rib plates are arranged in a circular array on the outer wall of the central sleeve, and an arc plate is arranged on the outer side of the rib plate, and the arc plate is fitted with the inner wall of the antenna cover; the rib plate is provided with a plurality of first mounting holes for the helical wire to pass through, and the helical wire is installed on the thin-walled support structure through the first mounting holes, and the thin-walled support structure is fixedly installed in the antenna cover; the thin-walled support structure adopts a configuration with high bending load-bearing efficiency, which can reduce the dependence on high-rigidity and high-strength materials. The structure can meet the engineering use requirements by adopting a two-dimensional weaving process. Compared with the current antenna support tube formed by an expensive three-dimensional weaving process, the cost of the satellite-borne helical antenna can be significantly reduced; and the thin-walled support structure significantly improves the antenna vibration fundamental frequency and the root stress during the vibration process under the premise of controlling the weight, and further enhances the bearing capacity of the system and the bending strength of the cantilever root. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 Schematic diagram of the internal structure of the axial mode helical antenna in an embodiment of the present invention;

[0031] Figure 2 This is a schematic structural diagram of a thin-wall support structure in an embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the bottom partial structure of the axial mode helical antenna in an embodiment of the present invention;

[0033] Figure 4 It is a top axonometric view of the bottom groove in an embodiment of the present invention;

[0034] Figure 5 It is a bottom-up axonometric view of the bottom trough in an embodiment of the present invention;

[0035] Figure 6 is a schematic diagram of the structure of the outer conductor in an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the bottom partial structure of the outer conductor in an embodiment of the present invention;

[0037] Figure 8 is a bottom isometric view of a first transition connector in an embodiment of the present invention;

[0038] Fig. 9 is a top axonometric view of a first transition connector in an embodiment of the present invention;

[0039] Fig.10 It is a schematic diagram of the top partial structure of the axial mode helical antenna in an embodiment of the present invention;

[0040] Fig.11 It is a schematic diagram of the top partial structure of the metal rod in an embodiment of the present invention;

[0041] Fig.12 Schematic diagram of the structure of the second transition connector in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The embodiments of the present application provide a high-gain axial-mode helical antenna resistant to strong vibrations, thereby solving the problems of large cantilever axial-mode helical antennas suffering from large deformation and easy breakage at the root of the cantilever in harsh vibration environments. This also breaks through the antenna's reliance on expensive composite material processes, resulting in a significant reduction in antenna manufacturing costs.

[0044] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0045] In an embodiment of the present invention, the axial mode helical antenna includes: a thin-walled support structure, an antenna cover and a helical wire; the thin-walled support structure includes: a central sleeve, a rib plate and an arc plate; the outer wall of the central sleeve is provided with a plurality of rib plates in a circular array, and an arc plate is provided on the outer side of the rib plate, and the arc plate is in contact with the inner wall of the antenna cover; the rib plate is provided with a plurality of first mounting holes for the helical wire to pass through, and the helical wire is installed on the thin-walled support structure through the first mounting holes, and the thin-walled support structure is fixedly installed in the antenna cover; the thin-walled support structure adopts a configuration with high bending load-bearing efficiency, which can reduce the dependence on high-rigidity and high-strength materials. The structure can meet the requirements of engineering use by adopting a two-dimensional weaving process. Compared with the current antenna support tube formed by an expensive three-dimensional weaving process, the cost of the satellite-borne helical antenna can be significantly reduced; and the thin-walled support structure significantly improves the antenna vibration fundamental frequency and the root stress during the vibration process under the premise of controlling the weight, and further enhances the bearing capacity of the system and the bending strength of the cantilever root.

[0046] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0047] Example:

[0048] like Figure 1 , Figure 2 As shown, the present invention provides a high-gain axial mode helical antenna on board with strong vibration resistance, and the axial mode helical antenna comprises: a thin-wall support structure, a radome 20 and a helical wire 30;

[0049] The thin-walled support structure includes: a central sleeve 10, a rib plate 11 and a curved plate 12; the outer wall of the central sleeve 10 is provided with a plurality of rib plates 11 in a circular array, the outer side of the rib plate 11 is provided with a curved plate 12, and the curved plate 12 is fitted with the inner wall of the antenna cover 20; the rib plate 11 is provided with a plurality of first mounting holes 13 for the spiral wire 30 to pass through, the spiral wire 30 is installed on the thin-walled support structure through the first mounting holes 13, and the thin-walled support structure is fixedly installed in the antenna cover 20.

[0050] The thin-walled support structure adopts a configuration with high bending load-bearing efficiency, which can reduce the dependence on high-rigidity and high-strength materials. The structure can meet the needs of engineering use by adopting a two-dimensional weaving process. Compared with the current antenna support tube formed by expensive three-dimensional weaving process, it can significantly reduce the cost of satellite-borne helical antennas; and the thin-walled support structure significantly improves the antenna vibration fundamental frequency and root stress during vibration while controlling the weight, and further enhances the system's load-bearing capacity and the bending strength of the cantilever root.

[0051] The thin-wall support structure is integrally formed by using a wave-transparent two-dimensional woven glass fiber reinforced composite material.

[0052] like Figures 3 to 5 As shown, the axial mode helical antenna further includes: a bottom slot 40;

[0053] A second mounting hole 41 is formed on the side wall of the bottom groove 40, a third mounting hole 14 is formed on the bottom of the arc plate 12, and a fourth mounting hole 21 is formed on the bottom of the antenna cover 20. The second mounting hole 41, the third mounting hole 14 and the fourth mounting hole 21 are connected correspondingly to realize a fixed connection between the bottom groove 40, the thin-wall support structure and the antenna cover 20.

[0054] like Figures 3 to 5 As shown, a mounting groove 42 is provided on the lower surface of the bottom plate of the bottom groove 40, and a first through hole 43, a second through hole 44 and a threaded blind hole 45 are provided in the mounting groove 42;

[0055] like Figure 6 , Figure 7As shown, the axial mode helical antenna further includes: an outer conductor;

[0056] The outer conductor includes: a metal rod 50 and a chassis 51;

[0057] The chassis 51 is fixed to the end of the metal rod 50, and the head end of the metal rod 50 passes through the first through hole 43 and the central sleeve 10 in sequence;

[0058] The chassis 51 is provided with fifth mounting holes 52 corresponding to the threaded blind holes 45 one by one. The chassis 51 is accommodated in the mounting groove 42 and is connected and fixed via the fifth mounting holes 52 and the threaded blind holes 45 .

[0059] like Figure 5 , Figure 7 As shown, a plurality of first weight-reducing grooves 46 are formed on the lower surface of the bottom plate of the bottom tank 40 ; a plurality of second weight-reducing grooves 53 are formed on the bottom surface of the bottom plate 51 .

[0060] like Figures 5 to 9 As shown, the upper surface of the chassis 51 is provided with pillars 54 corresponding to the second through holes 44 one by one; the pillars 54 pass through the second through holes 44 and are connected to the first transition connector 60;

[0061] The first transition connector 60 has a support hole 61 formed on the bottom surface, a first pin hole 62 formed on the top surface, and a first spiral hole 63 formed on the side surface and connected to the first pin hole 62;

[0062] The support 54 is fixedly connected to the support socket 61 . After the end of the spiral wire 30 is inserted into the first spiral wire socket 63 , a pin is inserted into the first pin hole 62 to achieve a fixed connection between the spiral wire 30 and the first transition connector 60 .

[0063] like Figures 10-12 As shown, the top side wall of the metal rod 50 is connected to a second transition connector 70, the top surface of the second transition connector 70 is provided with a second pin hole 71, and the side surface is provided with a second spiral wire insertion hole 72 connected to the second pin hole 71; after the head end of the spiral wire 30 is inserted into the second spiral wire insertion hole 72, a pin is inserted into the second pin hole 71 to achieve a fixed connection between the spiral wire 30 and the second transition connector 70.

[0064] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0065] In an embodiment of the present invention, the axial mode helical antenna includes: a thin-walled support structure, an antenna cover and a helical wire; the thin-walled support structure includes: a central sleeve, a rib plate and an arc plate; the outer wall of the central sleeve is provided with a plurality of rib plates in a circular array, and an arc plate is provided on the outer side of the rib plate, and the arc plate is in contact with the inner wall of the antenna cover; the rib plate is provided with a plurality of first mounting holes for the helical wire to pass through, and the helical wire is installed on the thin-walled support structure through the first mounting holes, and the thin-walled support structure is fixedly installed in the antenna cover; the thin-walled support structure adopts a configuration with high bending load-bearing efficiency, which can reduce the dependence on high-rigidity and high-strength materials. The structure can meet the requirements of engineering use by adopting a two-dimensional weaving process. Compared with the current antenna support tube formed by an expensive three-dimensional weaving process, the cost of the satellite-borne helical antenna can be significantly reduced; and the thin-walled support structure significantly improves the antenna vibration fundamental frequency and the root stress during the vibration process under the premise of controlling the weight, and further enhances the bearing capacity of the system and the bending strength of the cantilever root.

[0066] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-gain axial-mode helical antenna resistant to strong vibration, characterized in that: The axial mode helical antenna comprises: a thin-wall support structure, a radome (20) and a helical wire (30); The thin-walled support structure comprises: a central sleeve (10), a rib plate (11) and an arc plate (12); a plurality of rib plates (11) are arranged in an annular array on the outer wall of the central sleeve (10); an arc plate (12) is arranged on the outer side of the rib plate (11); the arc plate (12) is fitted with the inner wall of the antenna cover (20); the rib plate (11) is provided with a plurality of first mounting holes (13) for the spiral line (30) to pass through; the spiral line (30) is mounted on the thin-walled support structure through the first mounting holes (13); and the thin-walled support structure is fixedly mounted in the antenna cover (20); The axial mode helical antenna further comprises: an outer conductor; The outer conductor comprises: a metal rod (50) and a chassis (51); The chassis (51) is fixed to the end of the metal rod (50). The upper surface of the chassis (51) is provided with a support column (54); the support column (54) is connected to a first transition connector (60); The first transition connector (60) has a support plug hole (61) on its bottom surface, a first pin hole (62) on its top surface, and a first spiral plug hole (63) on its side surface that is connected to the first pin hole (62). The support (54) is fixedly connected to the support socket (61), and after the end of the spiral wire (30) is inserted into the first spiral wire socket (63), a pin is inserted into the first pin hole (62) to achieve a fixed connection between the spiral wire (30) and the first transition connector (60); The top side wall of the metal rod (50) is connected to a second transition connector (70); a second pin hole (71) is provided on the top surface of the second transition connector (70); and a second spiral wire insertion hole (72) connected to the second pin hole (71) is provided on the side surface; after the head end of the spiral wire (30) is inserted into the second spiral wire insertion hole (72), a pin is inserted into the second pin hole (71) to achieve a fixed connection between the spiral wire (30) and the second transition connector (70).

2. The strong vibration resistant satellite-borne high-gain axial mode helical antenna according to claim 1, characterized in that: The thin-wall support structure is integrally formed by using a wave-transparent two-dimensional woven glass fiber reinforced composite material.

3. The strong vibration resistant satellite-borne high-gain axial mode helical antenna according to claim 1, characterized in that: The axial mode helical antenna further comprises: a bottom slot (40); A second mounting hole (41) is provided on the side wall of the bottom groove (40), a third mounting hole (14) is provided on the bottom of the arc-shaped plate (12), and a fourth mounting hole (21) is provided on the bottom of the antenna cover (20). The second mounting hole (41), the third mounting hole (14) and the fourth mounting hole (21) are connected correspondingly to achieve fixed connection between the bottom groove (40), the thin-wall support structure and the antenna cover (20).

4. The strong vibration resistant satellite-borne high-gain axial mode helical antenna according to claim 3, characterized in that: A mounting groove (42) is provided on the lower surface of the bottom plate of the bottom groove (40), and a first through hole (43), a second through hole (44) and a threaded blind hole (45) are provided in the mounting groove (42).

5. The strong vibration resistant satellite-borne high-gain axial mode helical antenna according to claim 4, characterized in that: The head end of the metal rod (50) passes through the first through hole (43) and the central sleeve (10) in sequence; The chassis (51) is provided with fifth mounting holes (52) corresponding one-to-one to the threaded blind holes (45); the chassis (51) is accommodated in the mounting groove (42) and is connected and fixed via the fifth mounting holes (52) and the threaded blind holes (45).

6. The strong vibration resistant satellite-borne high-gain axial mode helical antenna according to claim 5, characterized in that: A plurality of first weight-reducing grooves (46) are provided on the lower surface of the bottom plate of the bottom trough (40); and a plurality of second weight-reducing grooves (53) are provided on the bottom surface of the bottom plate (51).

7. The strong vibration resistant satellite-borne high-gain axial mode helical antenna according to claim 5, characterized in that: The upper surface of the chassis (51) is provided with pillars (54) corresponding one to one with the second through holes (44); the pillars (54) pass through the second through holes (44) and are connected to the first transition connector (60).

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