Rigid ribbed electrostatically formed film reflector antenna device

Abstract

The application discloses a rigid rib type electrostatic forming thin film reflector antenna device, a rigid rib base support structure provides a structural support for the whole antenna system, a segmented flexible cable is hung on adjusting devices on two adjacent rib strips, a segmented thin film electrode surface is pasted on rib plate strips above the two adjacent rib strips, the thin film electrode surface between the two rib strips is supported and formed by the flexible cable, and the reflector is composed of a central fixed surface reflector, a metal wire mesh reflector and a thin film reflector; the thin film reflector is installed within a certain distance above the electrode surface and is used for reflecting electromagnetic waves; an electrostatic high-voltage power supply provides low potential for the thin film reflector and high potential for the thin film electrode surface, so as to complete the on-orbit shape preserving and electrostatic adjusting functions of the antenna thin film reflector.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of satellite antenna, and relates to a rigid rib type electrostatically formed thin film reflector antenna device. BACKGROUND

[0002] With the continuous development of space technology and the continuous improvement of demand, the performance requirements of the antenna are also continuously improved. Due to the long distance, the weak signal received by the satellite needs to be amplified, so the demand for high-gain satellite antenna is continuously improved, and the antenna should also have high surface precision, so that the weak signal can be obtained, and at the same time, the antenna aperture tends to be large to meet the application requirements of large capacity, high power, and multi-band and multi-function. High precision, large aperture, deployable, low mass and high storage ratio are the hotspots of the development and research of satellite antenna.

[0003] At present, the developed satellite deployable reflector antenna, such as the peripheral truss, radial rib, framework type and other net-shaped deployable reflector antenna, is difficult to meet the above requirements at the same time. The electrostatically formed thin film reflector deployable antenna is a new type of satellite antenna, which has the characteristics of high precision, large aperture and light mass, and provides a new scheme for realizing large aperture satellite antenna. The active real-time control of electrostatic forming provides a new method for improving the reflector precision, which can fully combine the technical advantages of active real-time control of electrostatic forming and large aperture of net-shaped antenna, and meet the requirements of high precision and large aperture of the antenna. At present, the research on electrostatically formed thin film antenna is basically based on the peripheral truss structure as the basic support structure, and the biggest problem is that the thin film is difficult to be folded and managed. The folding scheme proposed by Surya P. Chodimella (Design Evaluation of a Large Aperture Deployable Antenna [C]. / / 47th AIAA / ASME / ASCE / AHS / ASC Structures, Structural Dynamics, and Materials Conference.: American Institute of Aeronautics and Astronautics, 2006: 1-) and others of California Institute of Technology Jet Propulsion Laboratory is difficult to solve this problem. The scheme will produce irreparable folds after the thin film is folded, which seriously affects the deployment precision of the reflector. There is no good solution to this problem so far. SUMMARY

[0004] The purpose of this invention is to provide a rigid rib-type electrostatically formed thin-film reflector antenna device, which solves the problem that the thin film folding method is complicated and produces many creases in current electrostatically formed thin-film antennas, resulting in low accuracy of reflector unfolding.

[0005] The technical solution adopted in this invention is a rigid rib electrostatic forming thin-film reflector antenna device, comprising a rigid rib base support structure, the rigid rib base support structure including a plurality of ribs uniformly arranged along the circumferential direction, and a reflector surface mounted on the rigid rib base support structure; a plurality of rib strips uniformly distributed along the circumferential direction on the reflector surface, the rib strips being located on opposite sides of the reflector surface respectively; a flexible cable is hung on two adjacent ribs, and a thin-film electrode surface is pasted on two adjacent rib strips, the thin-film electrode surface between two adjacent rib strips is supported and formed by the flexible cable, and both the thin-film electrode surface and the reflector surface are connected to an electrostatic high voltage power supply.

[0006] The invention is further characterized by:

[0007] The rigid rib foundation support structure is a retractable structure, with each rib fixed to the central hub.

[0008] The ribs are made of carbon fiber and can be either straight or parabolic variable cross-section ribs.

[0009] Several adjusting posts, which are fixed by fixing nuts, are evenly arranged on the ribs, and an adjusting joint is installed at the upper end of each adjusting post.

[0010] The segmented flexible cable includes a front cable net and a rear cable net, which are connected by a vertical cable net. The front cable net is attached to the adjusting joint.

[0011] Adjusting the upper and lower parts of the adjusting joint simultaneously adjusts the rib strips, thereby adjusting the thin film electrode surface as a whole.

[0012] The thin-film electrode surface is in the form of segments, with one segment between two adjacent ribs. The thin-film electrode surface is first glued and fixed to the rib strips, and then the middle part of the thin-film electrode surface and the front cable net of the flexible cable are glued and fixed to form a parabolic shape.

[0013] The reflective surface includes a central solid surface reflective surface, a metal mesh reflective surface, and a thin film reflective surface. The metal mesh reflective surface serves as a transition surface between the central solid surface reflective surface and the thin film reflective surface.

[0014] The reflective surface includes a central solid surface reflective surface, a metal mesh reflective surface, and a thin film reflective surface. The metal mesh reflective surface serves as a transition surface between the central solid surface reflective surface and the thin film reflective surface.

[0015] The thin film reflecting surface comprises a reflecting surface thin film, a thin film skirt pull cable and a thin film reinforcing edge, the thin film skirt pull cable is hung on the adjusting joint at the end of the rib, and the thin film reinforcing edge reinforces the boundary of the reflecting surface thin film to prevent the thin film from being torn during the folding and unfolding process.

[0016] The adjusting method of the rigid rib type electrostatically formed thin film reflecting surface antenna comprises the following processes:

[0017] Firstly, the antenna thin film reflecting surface is unfolded along with the unfolding of the antenna rigid rib base support structure, then a voltage A is applied to the whole surface of the antenna thin film reflecting surface through the electrostatic high-voltage power supply, different voltages B are applied to different areas of the antenna thin film electrode surface, and the value of the voltage A is less than that of the voltage B, so that a potential difference is generated between the antenna thin film reflecting surface and the antenna thin film electrode surface, thereby generating electrostatic force to attract the antenna thin film reflecting surface and the antenna thin film electrode surface to each other, the size of the electrostatic force is adjusted by adjusting the size of the voltage applied to different areas of the antenna thin film electrode surface, and the profile maintenance and precision adjustment of the antenna thin film reflecting surface are realized.

[0018] The beneficial effects of the present application are as follows:

[0019] 1. The present application adopts a rigid rib type deployable structure as the support structure of the whole antenna system, which can be folded and unfolded like an umbrella, solves the problem of complex thin film folding mode in the electrostatically formed thin film antenna in the current actual engineering, causes more folds and low unfolding precision, and provides a feasible scheme for the on-orbit application of the electrostatically formed thin film antenna.

[0020] 2. The antenna reflecting surface of the present application adopts the combined form of solid surface reflecting surface, metal wire mesh reflecting surface and thin film reflecting surface, the solid surface reflecting surface has high precision and can guarantee the basic precision of the antenna, the thin film reflecting surface can be electrostatically adjusted, so that the whole antenna reaches a higher precision, and the metal wire mesh reflecting surface serves as a transition surface between the solid surface reflecting surface and the thin film reflecting surface, facilitates the folding management of the thin film reflecting surface and reduces the loss of the electrical performance of the antenna.

[0021] 3. The electrode surface profile of the present application also adopts the ideal parabolic surface shape formed by a mold, which is different from the previous approximation of the electrode parabolic surface by a plane, improves the precision of the electrode surface, and further improves the electrostatic regulation precision of the thin film reflecting surface.

[0022] 4. The flexible cable of the present application is hung on the adjusting joint on the antenna rib, so that the antenna flexible cable debugging work is facilitated in the specific engineering, and the precision of the flexible cable is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the antenna overall unfolding structure schematic diagram of the rigid rib type electrostatically formed thin film reflecting surface antenna device of the present application;

[0024] Figure 2 Figure 2 is a schematic diagram of the unfolded structure of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application after removal of the thin-film reflector;

[0025] Figure 3 Figure 3 is a schematic diagram of the unfolded structure of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application after removal of the thin-film electrode and the reflector;

[0026] Figure 4 Figure 4 is a schematic diagram of the cable structure of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0027] Figure 5 Figure 5 is a schematic diagram of the detailed structure of a single rib of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0028] Figure 6 Figure 6 is a schematic diagram of the cable and rib plate adjustment device of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0029] Figure 7 Figure 7 is a schematic diagram of the installation of the thin-film electrode and the rib plate of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0030] Figure 8 Figure 8 is a schematic diagram of the installation of the thin-film electrode and the cable of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0031] Figure 9 Figure 9 is a schematic diagram of the overall structure of the reflector of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0032] Figure 10 Figure 10 is a schematic diagram of the structure of the thin-film reflector of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0033] Figure 11 Figure 11 is a schematic diagram of the installation of the reflector of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0034] Figure 12 Figure 12 is a schematic diagram of the structure of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application after removal of the thin-film electrode and the reflector in the folded state;

[0035] Figure 13 Figure 13 is a schematic diagram of the state of the thin-film electrode and the thin-film reflector of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application in the folded state;

[0036] Figure 14 Figure 14 is a schematic diagram of the working principle of the rigid-rib electrostatically formed thin-film reflector antenna device of the present application;

[0037] Figure 15This is a finite element model diagram of the overall structure of the rigid rib electrostatic forming thin film reflector antenna device of the present invention;

[0038] Figure 16 This is a structural deformation cloud diagram of the rigid rib electrostatic forming thin film reflector antenna device of the present invention.

[0039] In the diagram, 1. Rigid rib foundation support structure, 2. Flexible cable, 3. Thin film electrode surface, 4. Reflective surface, 5. Electrostatic high voltage power supply, 11. Rib, 12. Adjusting column, 13. Adjusting joint, 14. Rib strip, 15. Fixing screw, 16. Fixing nut, 17. Reflective surface support block, 21. Front cable net, 22. Rear cable net, 23. Vertical cable net, 31. Adhesive tape, 41. Central fixed surface reflective surface, 42. Metal wire mesh reflective surface, 43. Thin film reflective surface, 121. Rear cable net hanging node on the adjusting column. 122. Upper end of the adjusting column; 131. Front cable net hanging node on the adjusting joint; 132. Lower end of the adjusting joint; 133. Upper end of the adjusting joint; 171. End A of the reflective surface support block; 172. End B of the reflective surface support block; 211. Front cable net hanging node; 221. Rear cable net hanging node; 411. Outer edge of the fixed surface; 421. Inner edge of the metal wire mesh reflective surface; 422. Outer edge of the metal wire mesh reflective surface; 431. Reflective surface film; 432. Film skirt cable; 433. Film reinforcing edge. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0041] The rigid rib electrostatically formed thin-film reflector antenna device of the present invention, such as... Figure 1 As shown, the antenna system includes a rigid rib base support structure 1, thin-film electrode surfaces 3, a reflector surface 4, and an electrostatic high-voltage power supply 5 (6000V). The rigid rib base support structure 1 provides structural support for the entire antenna system. The segmented thin-film electrode surfaces 3 are adhered to the rib strips 14 above adjacent ribs. The reflector surface 4 consists of a central fixed-surface reflector surface 41, a metal mesh reflector surface 42, and a thin-film reflector surface 43. The thin-film reflector surface 43 is installed at a certain distance above the electrode surfaces 3 to reflect electromagnetic waves. The electrostatic high-voltage power supply 5 provides a low potential to the thin-film reflector surface 43 and a high potential to the thin-film electrode surfaces 3, enabling on-orbit conformal maintenance and electrostatic adjustment of the antenna's thin-film reflector surface 43. The rigid rib base support structure 1 is a retractable structure, with ribs 11 fixed to a central hub. The number of ribs 11 can be designed according to the antenna's accuracy requirements. The material of rib 11 can be carbon fiber, which is formed by molding. For antennas with smaller diameters, rib 11 can be a straight variable cross-section rib, while for antennas with larger diameters, rib 11 can be a parabolic variable cross-section rib. Holes can be made on rib 11 to reduce weight and lower transmission costs.

[0042] As shown in Figure 2 The thin-film electrode surface 3 is in the form of segments, with each segment between two adjacent ribs 11, and the thin-film electrode surface 3 is first fixed on the rib plate 14 by means of glue. Figure 3 As shown in

[0043] As shown in Figure 4 The segmental cable 2 is composed of a front cable net 21, a rear cable net 22 and a vertical cable net 23. The rear cable net 22 of the cable 2 is hung on the rear cable net hanging node 121 of the adjusting column 12, and the rear cable net hanging node 121 of the adjusting column 12 is a fixed hanging node that cannot be adjusted. The front cable net 21 of the cable 2 is hung on the front cable net hanging node 131 of the adjusting joint 13, and the front cable net hanging node 131 of the adjusting joint 13 is an adjustable hanging node. The two ends of the front cable net 21 are respectively provided with front cable net hanging nodes 211, and the two ends of the rear cable net 22 are respectively provided with rear cable net hanging nodes 221. The rear cable net hanging nodes 221 are hung on the rear cable net hanging nodes 121 of the adjusting columns 12, and the rear cable net hanging nodes 121 of the adjusting columns 12 are fixed hanging nodes that cannot be adjusted. The front cable net hanging nodes 211 of the cable 2 are hung on the front cable net hanging nodes 131 of the adjusting joints 13, and the front cable net hanging nodes 131 of the adjusting joints 13 are adjustable hanging nodes. The hanging of the cable 2 is realized through the hanging nodes.

[0044] The adjustment process of the front cable net hanging node 131 of the adjusting joint 13 is as follows: the lower end 132 of the adjusting joint and the upper end 122 of the adjusting column are screw-connected, and the lower end 132 of the adjusting joint can move up and down along the upper end 122 of the adjusting column, so that all points of the front cable net 21 of the cable 2 can be adjusted as a whole, thereby achieving the purpose of adjusting the front cable net 21. The vertical cable net 23 of the cable 2 can be used to adjust the local points of the front cable net 21. The up-and-down adjustment of the adjusting joint 13 can also adjust the rib plate 14, thereby adjusting the thin-film electrode surface 3 as a whole. The surface shape of the thin-film electrode surface 3 is also an ideal parabolic shape formed by a mold, which is different from the previous approximation of the electrode parabolic surface by means of a plane, thereby improving the precision of the electrode surface and further improving the electrostatic control precision of the thin-film reflecting surface 43.

[0045] The thin-film electrode surface 3 is in the form of segments, with each segment between two adjacent ribs 11, and the thin-film electrode surface 3 is first fixed on the rib plate 14 by means of glue.

[0046] The flexible cable 2 is hung on the adjusting device of the adjacent two ribs of the rigid rib base support structure 1, and the diaphragm electrode surface 3 between the two ribs is supported and shaped by the flexible cable 2.

[0047] As shown in Figure 5 and Figure 6 , the rib 11 has a plurality of adjusting columns 12 fixed by the fixing nut 16, and the adjusting joint 13 is installed at the upper end 122 of the adjusting column 12, and the adjusting device is composed of the adjusting column 12 and the adjusting joint 13, and the front cable net hanging node 131 on the adjusting joint is adjustable, and the lower end 132 of the adjusting joint is threadedly connected with the upper end 122 of the adjusting column, and the lower end 132 of the adjusting joint can move up and down along the upper end 122 of the adjusting column, so that all points of the front cable net 21 of the flexible cable 2 can be adjusted as a whole, thereby achieving the purpose of adjusting the front cable net 21. The vertical cable net 23 of the flexible cable 2 can adjust a local point of the front cable net 21. The up and down adjustment of the adjusting joint 13 can also adjust the rib plate 14, thereby adjusting the diaphragm electrode surface 3 as a whole.

[0048] As shown in Figure 7 and Figure 8 , the rib plate 14 is fixed on the upper end 133 of the adjusting joint by the fixing screw 15, and the diaphragm electrode surface 3 adopts a segmented form, and each piece is between two adjacent ribs 11, and the diaphragm electrode surface 3 is first fixed on the rib plate 14 by using glue, and then the middle part of the diaphragm electrode surface 3 and the front cable net 21 of each piece of the flexible cable 2 are fixed by using the adhesive tape 31 to form a parabolic shape.

[0049] As shown in Figure 9 , the reflecting surface 4 is composed of the center fixed surface reflecting surface 41, the wire mesh reflecting surface 42 and the diaphragm reflecting surface 43, the center fixed surface reflecting surface 41 has high precision, which can ensure the basic precision of the antenna, and can also serve as a length reference for the on-orbit measurement of the antenna, the diaphragm reflecting surface 43 can be adjusted by static electricity on the orbit, so as to make the antenna reflecting surface reach a higher precision, and the wire mesh reflecting surface 42 serves as a transition surface between the center fixed surface reflecting surface 41 and the diaphragm reflecting surface 43, which facilitates the folding management of the diaphragm reflecting surface 43, reduces the gap between them, and improves the electrical performance of the antenna.

[0050] As shown in Figure 10As shown, the thin film reflecting surface 43 includes a reflecting surface film 431, a thin film skirt cable 432 and a thin film reinforcing edge 433. The reflecting surface film 431 can be made of aluminized polyimide film, Mylar film or Kapton film. The thin film skirt cable 432 is hung on the adjusting joint 13 at the end of the rib 11. The thin film reinforcing edge 433 reinforces the boundary of the reflecting surface film 431 to prevent the film from being torn during the folding and unfolding process. The material of the thin film skirt cable 432 can be aramid rope, carbon fiber rope or polyimide fiber rope.

[0051] The thin film skirt cable 432 of the thin film reflecting surface 43 is hung on the front cable net hanging node 131 of the adjusting joint, as shown in Figure 11 As shown, the thin film reinforcing edge 433 of the thin film reflecting surface 43 is fixed on the reflecting surface support block A end 171 by glue, and the metal wire mesh reflecting surface outer edge 422 is fixedly connected to the reflecting surface support block B end 172. The solid surface outer edge 411 of the center solid surface reflecting surface 41 is processed into a recess platform and uniformly distributed small holes. The recess platform takes into account the thickness of the metal wire mesh reflecting surface 42, so that the metal wire mesh and the center solid surface reflecting surface 41 are better fitted. The uniformly distributed small holes are connected with the inner edge 421 of the metal wire mesh reflecting surface. The inner edge 421 of the metal wire mesh reflecting surface is fixedly connected to the recess platform of the solid surface outer edge 411 of the center solid surface reflecting surface 41 by a cable, and the thin film reinforcing edge 433 of the thin film reflecting surface 43 is fixed on the reflecting surface support block A end 171 by glue, which fixes the inside of the thin film reflecting surface. The metal wire mesh reflecting surface outer edge 422 is connected and fixed to the reflecting surface support block B end 172, which plays a fixing role for the outer edge 422 of the metal wire mesh reflecting surface.

[0052] As shown in Figure 12 、 13 The folding and unfolding of the entire antenna is similar to that of a straight rod umbrella. When folded, the rib 11 is tightly wrapped around the center hub, and the thin film electrode surface 3 and the thin film reflecting surface 43 are tightly attached together when the antenna is folded. The thin film electrode surface 3 above the rib is attached to the rib plate 14, and the thin film between the two ribs is downwardly hung and located between the two ribs. As can be seen from the figure, the folding way of the thin film electrode surface 3 and the thin film reflecting surface 43 is very simple, and there is a relatively large curvature at the folding place, which basically will not cause creases, so as to not cause the problem of low unfolding precision.

[0053] As shown in Figure 14As shown, when the antenna structure is deployed, the electrostatic high voltage power supply 5 provides a low potential to the thin film reflector 43 and a high potential to the thin film electrode surface 3. The thin film reflector 43 and the thin film electrode surface 3 are equivalent to a capacitor. By changing the voltage, the potential difference between the two films can be changed, thereby enabling the thin film reflector 43 to perform on-orbit conformal and electrostatic adjustment functions, forming the reflector of the antenna to reflect electromagnetic waves and complete the on-orbit function of the antenna.

[0054] like Figure 15 As shown, compared to the 3D model, some parts of the model have been simplified to facilitate the construction of the overall model.

[0055] like Figure 16 As shown, due to the biased reflector used in the modeling, the overall structural deformation is symmetrical about the X-axis. The final calculated fitting accuracy of the reflector is 0.07mm, which has high reflector accuracy and can be applied to high-frequency spaceborne antennas.

[0056] Example 1

[0057] A rigid rib electrostatically formed thin-film reflector antenna device includes a rigid rib base support structure, which includes several ribs evenly arranged along the circumference. A reflector is mounted on the rigid rib base support structure. Several rib strips are evenly distributed along the circumference of the reflector, with the rib strips located on opposite sides of the reflector. Flexible cables are hung on adjacent ribs, and thin-film electrode surfaces are attached to adjacent rib strips. The thin-film electrode surfaces between adjacent rib strips are supported and shaped by the flexible cables. Both the thin-film electrode surfaces and the reflector are connected to an electrostatic high-voltage power supply.

[0058] Example 2

[0059] Based on Example 1, the rigid rib foundation support structure is a retractable structure, and each of the ribs is fixed to the central hub.

[0060] Example 3

[0061] Based on Example 2, the material of the rib is carbon fiber, and the rib can be a straight variable cross-section rib or a parabolic variable cross-section rib.

[0062] Example 4

[0063] Based on Example 2, several adjusting columns are evenly arranged on the rib and fixed by fixing nuts, and an adjusting joint is installed at the upper end of each adjusting column.

[0064] The working process of the rigid rib type electrostatic forming thin film reflector antenna device is as follows: when the antenna enters the orbit, the rib 11 is unfolded under the driving of the antenna driving mechanism, the rib 11 has a plurality of adjusting columns 12 fixed by the fixed nut 16, the upper end 122 of the adjusting column 12 is provided with an adjusting joint, the front cable net hanging node 131 of the adjusting joint 13 is hung with the flexible cable 2, the flexible cable 2 is tensioned with the unfolding of the rib 11 to provide support for the thin film electrode surface 3; the rib plate 14 is installed at the upper end 133 of the adjusting joint 13 through the fixed screw 15, the upper part of the rib plate 14 is pasted and fixed to the thin film electrode surface 3 through glue, and meanwhile the middle part of the thin film electrode surface 3 is pasted and fixed to the front cable net 21 of the flexible cable 2 through the adhesive tape 31, the thin film electrode surface 3 is unfolded and tensioned with the unfolding of the rib 11; the outer part of the reflector film 43 is connected to the upper end 131 of the outermost adjusting joint of the rib 11 through the thin film skirt cable 432, the inner film reinforcing edge 433 of the reflector film 43 is pasted and fixed to the A end 171 of the reflector support block through glue, the outer edge 422 of the wire mesh reflector is fixedly connected to the B end 172 of the reflector support block, the inner edge 421 of the wire mesh reflector is fixedly connected to the groove platform of the outer edge 411 of the central fixed surface reflector 41 through the cable, the groove platform considers the thickness of the wire mesh reflector 42, so that the wire mesh and the central fixed surface reflector 41 are better matched; the wire mesh reflector 42 and the thin film reflector 43 are also unfolded with the unfolding of the rib. After the antenna is completely unfolded, the thin film reflector 43, the wire mesh reflector 42 and the central fixed surface reflector 41 form the reflector of the whole antenna to reflect electromagnetic waves. The electrostatic high-voltage power supply 5 provides high potential for the thin film electrode surface 3 and low potential for the thin film reflector 43, and the in-orbit shape keeping and electrostatic adjustment function of the antenna thin film reflector 43 can be realized by adjusting the voltage.

[0065] The adjusting method of the rigid rib type electrostatic forming thin film reflector antenna is as follows: first, the antenna thin film reflector 43 is unfolded with the unfolding of the antenna rigid rib basic support structure 1, then a low voltage is applied to the whole surface of the antenna thin film reflector 43 through the electrostatic high-voltage power supply 5, different high voltages are applied to different regions of the antenna thin film electrode surface 3, so that a potential difference is generated between the antenna thin film reflector 43 and the antenna thin film electrode surface 3, thereby generating electrostatic force to make the antenna thin film reflector 43 and the antenna thin film electrode surface 3 attract each other, the size of the electrostatic force is adjusted by adjusting the voltage applied to different regions of the antenna thin film electrode surface 3, and the shape keeping and precision adjustment of the antenna thin film reflector 43 are realized. The electrode voltage of the antenna thin film electrode surface 3 can be actively controlled through the electrostatic high-voltage power supply 5, and the voltages of different electrodes can be independently controlled through different voltage channels.

Claims

1. A rigid rib-type electrostatically formed thin-film reflector antenna device, characterized in that: The system includes a rigid rib foundation support structure (1), which includes several ribs (11) evenly arranged along the circumference. A reflective surface (4) is installed on the rigid rib foundation support structure (1). Several rib strips (14) are evenly distributed along the circumference on the reflective surface (4). The rib strips (14) and the ribs (11) are located on opposite sides of the reflective surface (4). Flexible cables (2) are hung on two adjacent ribs (11). Thin film electrode surfaces (3) are pasted on two adjacent rib strips (14). The thin film electrode surfaces (3) between two adjacent rib strips (14) are supported and shaped by the flexible cables (2). Both the thin film electrode surfaces (3) and the reflective surface (4) are connected to an electrostatic high voltage power supply (5). The rigid rib foundation support structure (1) is a retractable structure, and each of the ribs (11) is fixed on the central hub; The material of the rib (11) is carbon fiber, and the rib (11) is a straight variable cross section rib or a parabolic variable cross section rib; A number of adjusting posts (12) are evenly arranged on the rib (11) and fixed by fixing nuts (16). Each adjusting post (12) has an adjusting connector (13) installed at its upper end. The segmented flexible cable (2) includes a front cable net (21) and a rear cable net (22), which are connected by a vertical cable net (23). The front cable net (21) is attached to the adjusting joint (13). The up and down adjustment of the adjustment joint (13) simultaneously adjusts the rib strip (14), thereby adjusting the thin film electrode surface (3) as a whole. The thin film electrode surface (3) is in the form of segments, with one segment between two adjacent ribs (11). The thin film electrode surface (3) is first glued and fixed on the rib strip (14), and then the middle part of the thin film electrode surface (3) and the front cable net (21) of the flexible cable (2) are glued and fixed with tape (31) to form a parabolic shape. The reflective surface (4) includes a central solid surface reflective surface (41), a metal mesh reflective surface (42), and a thin film reflective surface (43). The metal mesh reflective surface (42) is a transition surface between the central solid surface reflective surface (41) and the thin film reflective surface (43). The thin film reflective surface (43) includes a reflective film (431), a thin film skirt cable (432), and a thin film reinforcing edge (433). The thin film skirt cable (432) is attached to the adjusting joint (13) located at the end of the rib (11). The thin film reinforcing edge (433) reinforces the boundary of the reflective film (431) to prevent the film from being torn during the retraction and extension process.

2. The adjustment method of the rigid rib electrostatic forming thin film reflector antenna device according to claim 1, characterized in that, Specifically, the process includes the following steps: First, the antenna thin film reflector (43) is unfolded along with the antenna rigid rib base support structure (1). Then, a voltage A is applied to the entire surface of the antenna thin film reflector (43) through an electrostatic high voltage power supply (5), and different voltages B are applied to different areas of the antenna thin film electrode surface (3). The value of voltage A is less than that of voltage B, thereby generating a potential difference between the antenna thin film reflector (43) and the antenna thin film electrode surface (3), thereby generating electrostatic force, causing the antenna thin film reflector (43) and the antenna thin film electrode surface (3) to attract each other. By adjusting the magnitude of the voltage applied to different areas of the antenna thin film electrode surface (3), the magnitude of the electrostatic force is adjusted, thereby achieving the shape maintenance and precision adjustment of the antenna thin film reflector (43).

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