Parabolic reflector frame deployable antenna mechanism based on asymmetric four-pyramid units

Abstract

The application provides a kind of parabolic reflector framework deployable antenna mechanism based on asymmetric four-pyramid unit, which includes rhombic, rectangular and adaptive four-pyramid unit, each asymmetric four-pyramid unit includes a central flower disc, four outer flower discs, four central connecting rods and four groups of outer connecting rods, the asymmetric four-pyramid units are connected together through shared outer flower discs and outer connecting rods, and are connected through inner connecting rods and boundary connecting rods to form a single-degree-of-freedom parabolic reflector framework deployable antenna mechanism, and the height difference formed by the asymmetric four-pyramid units is used to construct a parabolic reflector.The deployable antenna mechanism of the application only contains a single degree of freedom, has the advantages of simple structure, easy-to-control deployment process, high deployment reliability, high degree of structural symmetry and good expansibility, and can form a parabolic reflector framework deployable antenna mechanism with any size and any curvature by changing the number of asymmetric four-pyramid units, the length of each connecting rod and the offset angle of the central connecting rod.

Description

Technical Field

[0001] This invention relates to an antenna mechanism, and more particularly to a deployable antenna mechanism based on a parabolic reflector frame with an asymmetric quadrangular pyramidal element. Background Technology

[0002] With the continuous development of the aerospace industry, technologies in the aerospace field are also constantly breaking through. As an important component of satellite structure, spaceborne antennas are receiving more and more attention. One important application of space-deployable mechanisms in the aerospace field is as support and deployment mechanisms for spaceborne antennas. In order to meet the growing needs of deep space exploration, the aperture of deployable antennas is increasing, enabling satellites to cover a wider area, observe farther distances, and achieve higher observation accuracy. Therefore, constructing large-scale space-deployable antennas is a key research focus for countries in modern aerospace technology activities.

[0003] Mesh reflector deployable antennas offer the best overall performance in terms of both surface accuracy and unfolded / folded volume ratio among various deployable antenna types. Larger size and higher surface accuracy are important development directions for future deployable antennas. Frame deployable antennas are a widely used type of mesh reflector deployable antenna. During unfolding, they function as a mechanism; when fully unfolded, they form a frame structure. They are characterized by high structural rigidity and high spatial positioning accuracy. In frame deployable antennas, the entire mesh is supported by the frame, resulting in high rigidity and easy assurance of surface accuracy. Therefore, frame deployable antennas are an important means of realizing large-aperture, high-precision antennas in the future.

[0004] Currently, theoretical research on deployable antenna mechanisms has made some progress. For example, Chinese patent CN202111357196.6 describes an array-type deployable antenna mechanism based on a quadrangular pyramid unit. This mechanism combines multiple tightly connected array-type deployable antenna mechanisms in a vertical and horizontal configuration, offering advantages such as high rigidity, high collapse ratio, high support performance, and adjustable aperture. However, it cannot construct a parabolic surface. Another Chinese patent, CN202111353495.2, describes a parabolic deployable antenna mechanism composed of a quadrangular pyramid unit. This mechanism uses quadrangular pyramid deployable units as basic units to form a parabolic deployable antenna mechanism, effectively achieving both fully deployed and collapsed states. However, the collapsed state results in the "explosion" of the rods, affecting the collapse ratio and making transportation inconvenient. Chinese Patent: A Modular Deployable Antenna Mechanism Based on Symmetrical Tetrahedral Combined Units, Patent No.: CN201811556043.2. The deployable antenna mechanism proposed in this patent consists of multiple deployable antenna modules. The modules of the deployable antenna mechanism are connected by Hooke's hinges, which can realize the relative attitude adjustment between the modules. It has the advantages of simple structure, low processing and manufacturing cost and low installation difficulty. It can form a large deployable antenna mechanism with high convergence ratio of arbitrary aperture. However, it has many degrees of freedom, and the deployment process is not easy to control, which reduces the reliability of deployment. Chinese Patent: A High Fold-to-Spread Ratio Double-Layer Ring Deployable Antenna Mechanism Based on Straight Quadrangular Prism Units, Patent No.: CN201910984462.4. This patent provides a high fold-to-spread ratio double-layer ring deployable antenna mechanism based on straight quadrangular prism units, including several identical straight quadrangular prism units. Each straight quadrangular prism unit is fixed by four connecting rods through two mirror-symmetrical upper and lower deployable modules. Several adjacent straight quadrangular prism units are networked. All joints are connected by revolute joints, which reduces the cold welding phenomenon that occurs during the movement of the mechanism. The use of straight quadrangular prism units has the advantages of high stability, large fold-to-spread ratio, high stiffness, and simple assembly. However, it is also impossible to construct a parabolic surface. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a deployable antenna mechanism based on a parabolic reflector frame using asymmetric quadrangular pyramidal units. It employs a novel quadrilateral surface division method, giving the deployable antenna mechanism only one degree of freedom. This results in advantages such as simple structure, good interchangeability, easy control of the deployment process, high stiffness, and high deployment reliability. By changing the number of asymmetric quadrangular pyramidal units, the length of each link, and the offset angle of the central link, a deployable antenna mechanism with a parabolic reflector frame of arbitrary size and curvature can be formed.

[0006] This invention provides a deployable antenna mechanism based on a parabolic reflector frame using asymmetric quadrangular pyramidal units. The mechanism includes rhombic quadrangular pyramidal units, rectangular quadrangular pyramidal units, and adaptive quadrangular pyramidal units. The rhombic and rectangular quadrangular pyramidal units are connected to the adaptive quadrangular pyramidal unit via a shared outer disc and an outer connecting rod. The rectangular quadrangular pyramidal unit is connected to the rhombic quadrangular pyramidal unit via a shared outer disc. Each asymmetric quadrangular pyramidal unit includes a central disc, an outer disc, a central connecting rod, and an outer connecting rod. The unit is a square pyramid whose projection is a rhombus. Four outer rhombus-shaped discs are located at the four vertices of the rhombus in the projection plane, and the central rhombus-shaped disc is located on the long diagonal of the rhombus in the projection plane. The outer rhombus-shaped discs are connected by outer connecting rods, and the outer rhombus-shaped discs are connected to the central rhombus-shaped disc by central connecting rods. These outer connecting rods are located on the four sides of the rhombus in the projection plane. Of the four central connecting rods in the rhombus's projection plane, two are located on the long diagonal of the rhombus, and two are located on either side of the long diagonal, forming the same angle with the long diagonal. The rectangular quadrangular pyramid unit has a projection that is a rectangle. Four rectangular outer discs are located at the four vertices of the rectangle in the projection plane. The rectangular central disc is located on the line connecting the midpoints of the two short sides of the rectangle in the projection plane. The outer discs are connected by outer connecting rods, and the outer and central discs are connected by central connecting rods. The outer connecting rods are located on the four sides of the rectangle in the projection plane. The four central connecting rods are located on both sides of the line connecting the midpoints of the two short sides of the rectangle in the projection plane and form the same angle with the line. The adaptive quadrangular pyramid unit has an adaptive central disc and outer discs on parallel planes. The adaptive central disc includes four evenly arranged through holes for mounting universal joints. The outer disc includes two layers of rotating slots. The first layer has one or two rotating slots for mounting rotating joints, with the direction from the outer disc to the adaptive central disc. The second layer has four rotating slots for mounting rotating joints, with the direction from the outer disc to the adjacent outer disc, and one or two through holes for mounting universal joints.

[0007] Preferably, in the rhomboid pyramid unit, the planes containing the rhomboid outer disc and the rhomboid central disc are parallel. Among the four rhomboid outer discs, the first rhomboid outer disc is located at a first height, the second and fourth rhomboid outer discs are located at a second height, and the third rhomboid outer disc is located at a third height, with the three heights decreasing sequentially. In the rectangular pyramid unit, the planes containing the rectangular outer disc and the rectangular central disc are parallel. Among the four rectangular outer discs, the first and second rectangular outer discs are located at a first height, and the third and fourth rectangular outer discs are located at a second height, with the two heights decreasing sequentially. There is a height difference between the rhomboid pyramid unit, the rectangular pyramid unit, and the adaptive pyramid unit. The parabolic reflective surface is constructed using the height difference, with the center line direction being the rhomboid pyramid unit and the diagonal direction being the rectangular pyramid unit.

[0008] Preferably, the central flower plate includes a rhombus-shaped central flower plate, a rectangular central flower plate, and an adaptive central flower plate, and the outer flower plate includes a rhombus-shaped outer flower plate, a rectangular outer flower plate, and a unit outer flower plate.

[0009] Preferably, the central flower plate includes two layers of rotating slots for setting rotating pairs. The first layer has two rotating slots, the directions of which are the diagonal of the long side of the rhomboid or rectangular projection surface, respectively. The second layer has four rotating slots, the directions of which are from the central flower plate to each of the outer flower plates.

[0010] Preferably, the outer flower plate includes two layers of rotating slots. The first layer has one or two rotating slots for setting a rotating pair, with its direction being from the outer flower plate to the central flower plate. The second layer has four rotating slots for setting a rotating pair, with its direction being from the outer flower plate to the adjacent outer flower plate. Part of the second layer has a through hole for setting a universal joint. The outer connecting rods between the first outer flower plate and the second outer flower plate and between the first outer flower plate and the fourth outer flower plate are the same. The outer connecting rods between the second outer flower plate and the third outer flower plate and between the fourth outer flower plate and the third outer flower plate are the same.

[0011] Preferably, both ends of the central connecting rod are provided with a revolute joint or a universal joint. The direction of the revolute joint is perpendicular to the planes on both sides of the central connecting rod. The universal joint consists of two revolute joints with two axes that intersect and are perpendicular to each other. The direction of the first revolute joint is perpendicular to the planes on both sides of the central connecting rod, and the direction of the second revolute joint is perpendicular to the plane of the corresponding connecting flower plate. The central connecting rod is rotatably connected to the central flower plate and the outer flower plate respectively.

[0012] Preferably, both ends of the inner connecting rod, outer connecting rod, and boundary connecting rod are provided with rotating pairs, and the ends of each connecting rod are rotatably connected in sequence to form a set of inner connecting rod, outer connecting rod, and boundary connecting rod. The inner connecting rod is used to connect the central flower plate of each asymmetric quadrangular pyramid unit, the outer connecting rod is used to connect the outer flower plate of each asymmetric quadrangular pyramid unit, and the boundary connecting rod is used to connect the outer outer flower plate.

[0013] Preferably, the two ends of the central connecting rod of the adaptive quadrangular pyramid unit are universal joints.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The parabolic reflector frame deployable antenna mechanism of the present invention adopts a brand-new quadrilateral surface division method, which gives it only one degree of freedom. That is, only one drive is needed to realize the overall mechanism’s unfolding and fully retracting motion. The unfolding process is easy to control, the unfolding reliability is high, and the unfolding / retracting volume ratio is large.

[0016] 2. The parabolic reflector frame deployable antenna mechanism of the present invention has a simple structure, good interchangeability, and certain spatial symmetry. It has few types of deployable units and rods, good expandability, and has the advantages of high stability, large folding-to-spread ratio, high stiffness, and simple assembly.

[0017] 3. The parabolic reflector frame deployable antenna mechanism of the present invention can change the size of the deployable antenna mechanism by changing the number of three asymmetric quadrangular pyramid units and the length of each link, and change the height difference of the outer flower plate of the asymmetric quadrangular pyramid unit by changing the offset angle of the central link of the asymmetric quadrangular pyramid unit, thereby changing the curvature of the parabolic reflector, so as to construct a deployable antenna mechanism of arbitrary size and arbitrary curvature, which can meet a variety of aviation requirements. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the fully deployed antenna mechanism based on an asymmetric quadrangular pyramidal unit parabolic reflector frame of the present invention.

[0019] Figure 2 In this invention Figure 1 A projection diagram of the fully unfolded state;

[0020] Figure 3 In this invention Figure 1 A side view of the fully deployed state;

[0021] Figure 4 In this invention Figure 1 A 3D diagram of the fully retracted state;

[0022] Figure 5 This is a three-dimensional schematic diagram of the fully unfolded quadrangular pyramid unit in this invention;

[0023] Figure 6 In this invention Figure 5 A projection diagram of the fully unfolded state;

[0024] Figure 7 In this invention Figure 5 A side view of the fully deployed state;

[0025] Figure 8 This is a three-dimensional schematic diagram of the fully unfolded rectangular quadrangular pyramid unit in this invention;

[0026] Figure 9 In this invention Figure 8 A projection diagram of the fully unfolded state;

[0027] Figure 10 In this invention Figure 8 A side view of the fully deployed state;

[0028] Figure 11 This is a three-dimensional schematic diagram of the fully unfolded adaptive tetrahedral pyramid unit of the present invention;

[0029] Figure 12 In this invention Figure 11 A projection diagram of the fully unfolded state;

[0030] Figure 13 This is a three-dimensional schematic diagram of the fully deployed antenna mechanism with a ribbed parabolic reflector frame in a specific embodiment of the present invention.

[0031] Figure 14 In this invention Figure 13 A projection diagram of the fully unfolded state;

[0032] Figure 15 In this invention Figure 13 A side view of the fully deployed state;

[0033] Figure 16 In this invention Figure 13 A 3D diagram of the fully retracted state;

[0034] Figure 17 This is a three-dimensional schematic diagram of the fully unfolded state of the central regular hexagonal pyramidal unit in a specific embodiment of the present invention.

[0035] Key reference numerals:

[0036] Rhomboid square pyramid element A, rectangular square pyramid element B, adaptive square pyramid element C, regular hexagonal pyramid element D, rhomboid central disc L0, rhomboid outer discs L1-L4, rectangular central disc J0, rectangular outer discs J1-J4, adaptive central disc Z0, element outer discs Z1-Z4, inner link 1, boundary link 2, central link 3, outer link 4, regular hexagonal pyramid central disc 5, regular hexagonal pyramid outer disc 6. Detailed Implementation

[0037] To fully describe the technical content, structural features, objectives, and effects of this invention, a detailed description will be provided below in conjunction with the accompanying drawings.

[0038] This invention relates to a deployable antenna mechanism based on a parabolic reflector frame with asymmetric quadrangular pyramidal elements, such as... Figure 1 and Figure 2As shown, it includes a rhombic square pyramid unit A, a rectangular square pyramid unit B, and an adaptive square pyramid unit C. Both the rhombic square pyramid unit A and the rectangular square pyramid unit B are connected to the adaptive square pyramid unit C through a shared outer flower plate and an outer connecting rod 4. The rectangular square pyramid unit B is connected to the rhombic square pyramid unit A through a shared outer flower plate (rhombic outer flower plate L1-L4, rectangular outer flower plate J1-J4). Each asymmetric square pyramid unit includes a central flower plate (rhombic central flower plate L0, rectangular central flower plate J0, adaptive central flower plate Z0), an outer flower plate (rhombic outer flower plate L1-L4, rectangular outer flower plate J1-J4, unit outer flower plate Z1-Z4), a central connecting rod 3, and an outer connecting rod 4. The deployable antenna mechanism with a single degree of freedom parabolic reflector frame can be modified by increasing or decreasing the number of three asymmetric quadrangular pyramidal units and changing the length of each link. The height difference of the outer plates (rhomboid outer plates L1-L4, rectangular outer plates J1-J4, and unit outer plates Z1-Z4) in the asymmetric quadrangular pyramidal unit can be changed by changing the offset angle of the central link 3 of the asymmetric quadrangular pyramidal unit, thereby changing the curvature of the parabolic reflector.

[0039] like Figure 3 and Figure 4 As shown, in the rhomboid pyramid unit A, the planes containing the rhomboid outer disks L1-L4 and the rhomboid central disk L0 are parallel. The four rhomboid outer disks L1-L4 are arranged as follows: the first rhomboid outer disk L1 is at the first height, the second and fourth rhomboid outer disks L2 and L4 are at the second height, and the third rhomboid outer disk L3 is at the third height. These three heights decrease sequentially, and the height differences h1 and h2 increase as the offset angle α decreases. In the rectangular pyramid unit B, the planes containing the rectangular outer disks J1-J4 and the rectangular central disk J0 are parallel. The four rectangular outer disks... In the flower discs J1-J4, the first rectangular outer flower disc J1 and the second rectangular outer flower disc J2 are located at the first height, and the third rectangular outer flower disc J3 and the fourth rectangular outer flower disc J4 are located at the second height. The two heights decrease sequentially, and the height difference h3 increases with the increase of the offset angle β. There is a height difference between the rhombic square pyramid unit A, the rectangular square pyramid unit B, and the adaptive square pyramid unit C. The parabolic reflective surface is constructed using the height difference. The center line direction is the rhombic square pyramid unit A, the oblique line direction is the rectangular square pyramid unit B, and the remaining positions are all adaptive square pyramid units C.

[0040] like Figures 5-7As shown, the rhomboid quadrangular pyramid unit A is projected as a rhombus. The four rhomboid outer discs L1-L4 are located at the four vertices of the rhombus in the projection plane. The rhomboid central disc L0 is located on the long diagonal of the rhombus in the projection plane. The outer discs L1-L4 are connected by outer connecting rods 4. The rhomboid outer discs L1-L4 and the rhomboid central disc L0 are connected by central connecting rods 3. The outer connecting rods 4 are located on the four sides of the rhombus in the projection plane. Of the four central connecting rods 3 in the rhomboid projection plane, two are located on the long diagonal of the rhombus, and two are located on both sides of the long diagonal of the rhombus and at the same angle to the long diagonal.

[0041] like Figures 8-10 As shown, the rectangular quadrangular pyramid unit B has a projection that is a rectangle. Four rectangular outer discs J1-J4 are located at the four vertices of the rectangle in the projection plane. The central disc J0 is located on the line connecting the midpoints of the two shorter sides of the rectangle in the projection plane. The outer discs J1-J4 are connected by outer connecting rods 4, and the outer discs J1-J4 are connected to the central disc J0 by central connecting rods 3. The outer connecting rods 4 are located on the four sides of the rectangle in the projection plane. The four central connecting rods 3 are located on both sides of the line connecting the midpoints of the two shorter sides of the rectangle in the projection plane and form the same angle with the line. Each end of the central connecting rod 3 is equipped with a revolute joint or a universal joint. The universal joint (both ends of the central connecting rod 3 of the adaptive quadrangular pyramid unit C are universal joints) has a direction perpendicular to the planes on both sides of the central connecting rod 3. The universal joint consists of two rotating joints with two intersecting axes that are perpendicular to each other. The direction of the first rotating joint is perpendicular to the planes on both sides of the central connecting rod 3, and the direction of the second rotating joint is perpendicular to the plane of the corresponding connecting plate. The central connecting rod 3 is rotatably connected to the central plate (rhomboid central plate L0, rectangular central plate J0, adaptive central plate Z0) and the outer plates (rhomboid outer plates L1-L4, rectangular outer plates J1-J4, unit outer plates Z1-Z4).

[0042] like Figure 11 and Figure 12 As shown, in the adaptive quadrangular pyramidal element A, the planes containing the adaptive central disc Z0 and the outer discs Z1-Z4 are parallel. The adaptive central disc Z0 includes four evenly arranged through holes for mounting universal joints. The outer discs Z1-Z4 include two layers of rotating slots. The first layer has one or two rotating slots for mounting rotating joints, with the direction from the outer discs Z1-Z4 to the adaptive central disc Z0. The second layer has four rotating slots for mounting rotating joints, with the direction from the outer discs Z1-Z4 to the adjacent outer discs Z1-Z4, and one or two through holes for mounting universal joints.

[0043] like Figures 13-17As shown, the central flower disk includes a rhombus-shaped central flower disk L0, a rectangular central flower disk J0, and an adaptive central flower disk Z0. The outer flower disk includes rhombus-shaped outer flower disks L1-L4, rectangular outer flower disks J1-J4, and unit outer flower disks Z1-Z4. The inner connecting rod 1, the outer connecting rod 4, and the boundary connecting rod 2 are all equipped with rotating pairs at both ends. The ends of each connecting rod are rotatably connected in sequence to form a set of inner connecting rod 1, outer connecting rod 4, and boundary connecting rod 2. The inner connecting rod 1 is used to connect the central flower disks of each asymmetric quadrangular pyramid unit (rhombus-shaped central flower disk L0, rectangular central flower disk J0, adaptive central flower disk Z0). The outer connecting rod 4 is used to connect the outer flower disks of each asymmetric quadrangular pyramid unit (rhombus-shaped outer flower disks L1-L4, rectangular outer flower disks J1-J4, unit outer flower disks Z1-Z4). The boundary connecting rod 2 is used to connect the outermost outer flower disks (rhombus-shaped outer flower disks L1-L4, rectangular outer flower disks J1-J4, unit outer flower disks Z1-Z4). The central flower plate (rhombus-shaped central flower plate L0, rectangular central flower plate J0) includes two layers of rotating slots for setting up rotating pairs. The first layer has two rotating slots, oriented along the diagonal of the long side of the rhombus (rectangular) projection surface. The second layer has four rotating slots, oriented from the central flower plate (rhombus-shaped central flower plate L0, rectangular central flower plate J0) to each outer flower plate (rhombus-shaped outer flower plate L1-L4, rectangular outer flower plate J1-J4). The outer flower plates (rhombus-shaped outer flower plates L1-L4, rectangular outer flower plates J1-J4) also include two layers of rotating slots. The first layer has one or two rotating slots for setting up rotating pairs, oriented from the outer flower plates (rhombus-shaped outer flower plates L1-L4, rectangular outer flower plates J1-J4) to the central flower plate (rhombus-shaped central flower plate L0, rectangular central flower plate J0). The second layer has four rotating slots for setting up rotating pairs, oriented from the outer flower plates (rhombus-shaped central flower plate L0, rectangular central flower plate J0). A through hole is partially opened in the direction of the adjacent outer flower plate to install a universal joint. The outer connecting rod 4 between the first outer flower plate (diamond outer flower plate L1, rectangular outer flower plate J1) and the second outer flower plate (L2, J2) and between the first outer flower plate (L1, J1) and the fourth outer flower plate (L4, J4) is the same. The outer connecting rod 4 between the second outer flower plate (L2, J2) and the third outer flower plate (L3, J3) and between the fourth outer flower plate (L4, J4) and the third outer flower plate (L3, J3) is the same.

[0044] The following describes in further detail a deployable antenna mechanism based on a parabolic reflector frame with an asymmetric quadrangular pyramidal element, according to the present invention:

[0045] like Figures 13-16As shown, the deployable antenna mechanism based on the parabolic reflector frame of asymmetric quadrangular pyramidal units includes a central regular hexagonal pyramidal unit D and eighteen rectangular quadrangular pyramidal units B. The six ribs are identical and are composed of three rectangular quadrangular pyramidal units B with progressively increasing height differences. They are used to fit the parabolic reflector. The pyramidal units are connected by a shared outer flower plate (rectangular outer flower plate J1-J4, regular hexagonal pyramidal outer flower plate 6) and an outer connecting rod 4. The central flower plates of all pyramidal units (rectangular central flower plate J0, regular hexagonal pyramidal central flower plate 5) are connected by an inner connecting rod 1 to increase rigidity, thus forming a ribbed parabolic reflector frame deployable antenna mechanism.

[0046] like Figure 17 As shown, the regular hexagonal pyramid unit includes a central hexagonal pyramid disk 5, six outer hexagonal pyramid disks 4, six central connecting rods 3, and six sets of outer connecting rods 4. The planes on which the seven disks are located are all parallel. The central hexagonal pyramid disk 7 consists of two layers of rotating slots. The rotating slots are used to set up rotating pairs. The first layer of rotating slots has six slots, and their directions are from the central hexagonal pyramid disk 5 to the rectangular central pyramid disk J0 of the adjacent rectangular square pyramid unit B. The second layer of rotating slots has six slots, and their directions are from the central hexagonal pyramid disk 5 to the outer hexagonal pyramid disk 6. The outer hexagonal pyramid disk 6 consists of two layers of rotating slots. The first layer of rotating slots has three slots, and their directions are from the outer hexagonal pyramid disk 6 to the central hexagonal pyramid disk 5. The second layer of rotating slots has four slots, and their directions are from the outer hexagonal pyramid disk 6 to the adjacent outer disk.

[0047] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A deployable antenna mechanism based on a parabolic reflector frame with an asymmetric quadrangular pyramidal element, characterized in that, It includes rhombic square pyramid elements, rectangular square pyramid elements, and adaptive square pyramid elements. The rhombic square pyramid unit and the rectangular square pyramid unit are both connected to the adaptive square pyramid unit through a shared outer flower plate and an outer connecting rod. The rectangular square pyramid unit is connected to the rhombic square pyramid unit through a shared outer flower plate. Each asymmetric square pyramid unit includes a central flower plate, an outer flower plate, a central connecting rod, and an outer connecting rod. The rhombic pyramidal unit is projected as a rhombus. The four outer rhombic discs are located at the four vertices of the rhombus in the projection plane, and the central rhombic disc is located on the long diagonal of the rhombus in the projection plane. The outer rhombic discs are connected by outer connecting rods, and the outer rhombic discs and the central rhombic disc are connected by central connecting rods. The outer connecting rods are located on the four sides of the rhombus in the projection plane. Of the four central connecting rods in the rhombic projection plane, two are located on the long diagonal of the rhombus, and two are located on both sides of the long diagonal and at the same angle to the long diagonal. The rectangular quadrangular pyramid unit has a projection that is a rectangle. The four outer rectangular discs are located at the four vertices of the rectangle in the projection plane. The central rectangular disc is located on the line connecting the midpoints of the two short sides of the rectangle in the projection plane. The outer rectangular discs are connected by outer connecting rods. The outer rectangular discs and the central rectangular disc are connected by central connecting rods. The outer connecting rods are located on the four sides of the rectangle in the projection plane. The four central connecting rods are located on both sides of the line connecting the midpoints of the two short sides of the rectangle in the projection plane and are at the same angle to the line. The adaptive quadrangular pyramid unit has an adaptive central disc and an outer disc in parallel planes. The adaptive central disc includes four evenly arranged through holes for mounting universal joints. The outer disc includes two layers of rotating slots. The first layer has one or two rotating slots for mounting rotating joints, with the direction from the outer disc to the adaptive central disc. The second layer has four rotating slots for mounting rotating joints, with the direction from the outer disc to the adjacent outer disc, and includes one or two through holes for mounting universal joints. In the rhomboid pyramid unit, the planes containing the rhomboid outer and central discs are parallel. Among the four rhomboid outer discs, the first rhomboid outer disc is located at the first height, the second and fourth rhomboid outer discs are located at the second height, and the third rhomboid outer disc is located at the third height, with the three heights decreasing sequentially. In the rectangular pyramid unit, the planes containing the rectangular outer and central discs are parallel. Among the four rectangular outer discs, the first and second rectangular outer discs are located at the first height, and the third and fourth rectangular outer discs are located at the second height, with the two heights decreasing sequentially. There is a height difference between the rhomboid pyramid unit, the rectangular pyramid unit, and the adaptive pyramid unit. The parabolic reflective surface is constructed using the height difference. The center line direction is the rhomboid pyramid unit, and the diagonal direction is the rectangular pyramid unit.

2. The deployable antenna mechanism based on a parabolic reflector frame with an asymmetric quadrangular pyramidal element according to claim 1, characterized in that, The central flower plate includes a rhombus-shaped central flower plate, a rectangular central flower plate, and an adaptive central flower plate, and the outer flower plate includes a rhombus-shaped outer flower plate, a rectangular outer flower plate, and a unit outer flower plate.

3. The deployable antenna mechanism based on a parabolic reflector frame with an asymmetric quadrangular pyramidal element according to claim 1, characterized in that, The rhomboid or rectangular central flower plate includes two layers of rotating slots for setting rotating pairs. The first layer has two rotating slots, the directions of which are the diagonal of the long side of the rhomboid or rectangular projection surface. The second layer has four rotating slots, the directions of which are from the central flower plate to each of the outer flower plates.

4. The deployable antenna mechanism based on an asymmetric quadrangular pyramidal unit parabolic reflector frame according to claim 1 or 3, characterized in that, The outer flower plate includes two layers of rotating slots. The first layer has one or two rotating slots for setting a rotating pair, with its direction being from the outer flower plate to the central flower plate. The second layer has four rotating slots for setting a rotating pair, with its direction being from the outer flower plate to the adjacent outer flower plate. Part of it has a through hole for setting a universal joint. The outer connecting rods between the first outer flower plate and the second outer flower plate, and between the first outer flower plate and the fourth outer flower plate are the same. The outer connecting rods between the second outer flower plate and the third outer flower plate, and between the fourth outer flower plate and the third outer flower plate are the same.

5. The deployable antenna mechanism based on a parabolic reflector frame with an asymmetric quadrangular pyramidal element according to claim 1, characterized in that, Both ends of the central connecting rod are provided with a revolute joint or a universal joint. The direction of the revolute joint is perpendicular to the planes on both sides of the central connecting rod. The universal joint consists of two revolute joints with two axes that intersect and are perpendicular to each other. The direction of the first revolute joint is perpendicular to the planes on both sides of the central connecting rod, and the direction of the second revolute joint is perpendicular to the plane of the corresponding connecting flower plate. The central connecting rod is rotatably connected to the central flower plate and the outer flower plate respectively.

6. The deployable antenna mechanism based on an asymmetric quadrangular pyramidal unit parabolic reflector frame according to claim 1, characterized in that, The inner link, outer link, and boundary link are all provided with rotating pairs at both ends. The ends of each link are rotatably connected in sequence to form a set of inner link, outer link, and boundary link. The inner link is used to connect the central flower disk of each asymmetric quadrangular pyramid unit, the outer link is used to connect the outer flower disk of each asymmetric quadrangular pyramid unit, and the boundary link is used to connect the outer outer flower disk.

7. The deployable antenna mechanism based on a parabolic reflector frame with an asymmetric quadrangular pyramidal element according to claim 1, characterized in that, The central connecting rod of the adaptive quadrangular pyramid unit has universal joints at both ends.

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