CN116053750A - Reconfigurable multistable folded antenna system - Google Patents

Reconfigurable multistable folded antenna system Download PDF

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Publication number
CN116053750A
CN116053750A CN202310127727.5A CN202310127727A CN116053750A CN 116053750 A CN116053750 A CN 116053750A CN 202310127727 A CN202310127727 A CN 202310127727A CN 116053750 A CN116053750 A CN 116053750A
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Prior art keywords
antenna
configuration
motor
folded
folding
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CN202310127727.5A
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CN116053750B (en
Inventor
陈小前
张翔
付康佳
姚雯
吴雪松
庹洲慧
黄奕勇
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National Defense Technology Innovation Institute PLA Academy of Military Science
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National Defense Technology Innovation Institute PLA Academy of Military Science
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1235—Collapsible supports; Means for erecting a rigid antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/288—Satellite antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • H01Q15/002—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices being reconfigurable or tunable, e.g. using switches or diodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses a reconfigurable multistable folded antenna system, which comprises a folded antenna structure positioned outside a satellite cabin; an antenna shell, a folding and unfolding driving mechanism and a transceiver which are positioned in the satellite cabin; and an antenna mast bracket connecting the folded antenna structure and the antenna housing; the folding antenna structure comprises a first indentation plate and a second indentation plate which are overlapped and partially connected, so that the folding antenna at least has a fully-unfolded configuration and a fully-folded configuration, and the folding antenna structure is switched between the fully-unfolded configuration and the fully-folded configuration through a folding driving mechanism. The reconfigurable multistable folded antenna system can realize antenna folding and unfolding and configuration switching suitable for satellite clusters on the premise of providing ultra-compact light accumulation and easy folding and unfolding, and any stable configuration can realize self-maintenance of the system without energy consumption.

Description

Reconfigurable multistable folded antenna system
Technical Field
The invention relates to the technical field of astronomical observation, in particular to a reconfigurable multistable folded antenna system inspired by folded paper.
Background
The satellite-borne antenna is a research direction of rapid development in recent years, is key equipment for space detection communication, earth observation and the like, and has the development trend of high expansion and contraction ratio, high precision and light weight. Over the last thirty years of development, the satellite-borne antennas developed toward two polarizations (maximization and minimization). The large-sized satellite-borne antenna suitable for the high-orbit high-value satellite is rapidly developed, and in recent years, a deployable antenna mechanism form which aims at a hundred-meter scale, such as an umbrella antenna, a ring cable network antenna, a frame antenna, a film antenna and the like, is developed, and the large-sized satellite-borne antenna with the caliber of tens of meters, which is represented by a 'Tiantong' series satellite antenna, is also launched in China. However, for the clustered satellites characterized by small and light weight, the classical satellite antenna cannot meet the diversified detection and communication requirements of the clustered satellites. Compared with a high-orbit large satellite, the cluster satellite has more severe boundary constraints on the structural volume, weight and the like of the satellite-borne antenna, and a cluster satellite monomer with highly integrated functions requires that the antenna has the capability of adapting and reconfiguring various electromagnetic characteristics (working frequency, bandwidth, polarization, beam width and the like). Therefore, clustered satellites present a more stringent design standard for satellite-borne antennas, which not only require light and efficient loading in small satellites, but also require electromagnetic reconfigurability.
The shape of the space-borne reconfigurable antenna can be changed to adapt and reconfigure electromagnetic performance (working frequency, bandwidth, polarization, beam width and the like), and the paper folding structure provides an effective means for realizing compact loading, easy unfolding, light weight, high efficiency and configuration switching for the reconfigurable antenna due to the characteristic that the paper folding structure can realize the efficient conversion of the form between the two-dimensional plane and the three-dimensional space structure. The folding paper has the essential advantage of solving the problem of plane and space structure transformation, and the modular unitization of the folding paper style meets the paving theory, thereby being beneficial to engineering implementation.
The existing two-dimensional paper folding derived expandable structure mainly realizes folding and expanding of the structure in two orthogonal dimensions of space through paper folding, and is generally used for products such as solar cell arrays, planar phased array antennas, solar sails and the like. Common paper folding patterns include Miura mode, spiral mode, circumflex mode, water Motor Bom Motor B mode, flacher mode, nojima mode, and the like. In terms of a space two-dimensional expandable structure, a film solar cell array 2-dimentional Solar Array (2 DSA) successfully verified on-orbit in 1995 is a precursor of a paper folding derivative expandable structure, and an array surface folding method adopted by the film solar cell array is a Miura paper folding mode proposed by three Pu Gongliang of Japanese scientists. The IKAROS deep space exploration solar sail successfully launched in Japan in 2010 is characterized in that the film array surface of the IKAROS deep space exploration solar sail is efficiently stored in a circumscribing and rotor paper folding mode, and the in-orbit deployment is realized through the spin of an aircraft. In addition, the cube star origin-1 successfully transmitted in japan in 2019 is mounted with an integrated thin film solar cell array and antenna based on the Spiral paper folding mode. It can be said that the current classical and novel paper folding modes provide a rich material basis for the spatial expandable structure.
The current two-dimensional paper folding structure comprises a Miura mode, a Spiral mode, a circumferecent mode, a Water motor Bom motor B mode, a flash mode, a Nojima mode and the like, and most of the two-dimensional paper folding structures are switched from a folded state during transmitting and transporting to an unfolded state during on-orbit working by means of elasticity, spin, intelligent material driving or rope lock driving of the structure. Generally, the above-described spatially expandable structures have only two stable states, a folded configuration and an expanded configuration, while the intermediate process configuration from folding to expanding is unstable.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a self-maintenance reconfigurable plane folded antenna inspired by folded paper, which realizes the antenna folding and unfolding and configuration switching applicable to satellite clusters and the regulation and control of the electromagnetic characteristics of the antenna such as working frequency, bandwidth, polarization, beam width and the like on the premise of providing ultra-compact light accumulation and easy folding and unfolding, namely, the antenna can be reconfigured, tunable, multifunctional, foldable and ultra-wideband.
In order to achieve the above object, the present invention provides a reconfigurable multistable folded antenna system, the antenna system comprising a folded antenna structure located outside a satellite cabin; an antenna shell, a folding and unfolding driving mechanism and a transceiver which are positioned in the satellite cabin; and an antenna mast bracket connecting the folded antenna structure and the antenna housing; the folding antenna structure comprises a first indentation plate and a second indentation plate which are overlapped and partially connected, so that the folding antenna at least has a fully-unfolded configuration and a fully-folded configuration, and the folding antenna structure is switched between the fully-unfolded configuration and the fully-folded configuration through a folding driving mechanism.
Further, the folded antenna structure is divided into a center panel, an edge panel and a connecting panel, the connecting panel is located between the center panel and the edge panel, and a plurality of folds are formed in the connecting panel and the edge panel, so that the connecting panel and the edge panel can be folded and deformed, and the folded antenna structure can have a fully unfolded configuration, a fully folded configuration and a plurality of stable configurations.
Further, the first and second creasing plates provide a folded antenna structure having 16 configurations, including a fully unfolded configuration, a fully folded configuration, and 14 partially folded stable configurations, achieving 6 antenna array envelope areas.
Further, the first indentation plate and the second indentation plate are the same in position as the crease lines, each crease line has 24 crease lines, the 24 crease lines of the first indentation plate are divided into 4 types, and the first type crease lines are
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The second kind of crease is->
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The third crease is->
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The fourth crease is->
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The method comprises the steps of carrying out a first treatment on the surface of the In the first indentation plate, quadrilateral ++>
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Quadrilateral->
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Quadrilateral->
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Quadrilateral shape
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The inner region is empty; correspondingly, the 24 folds of the second creasing plate are also classified into 4 types, the first type of folds being
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The second kind of crease is->
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The third crease is->
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The fourth crease is- >
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The method comprises the steps of carrying out a first treatment on the surface of the In the second indentation plate, quadrilateral ++>
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Quadrilateral->
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Quadrilateral->
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Quadrilateral->
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The inner area is empty, and 9 square areas of the first indentation plate and the second indentation plate are bonded into a whole and are respectively square areas
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And square area->
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Adhesive, square area->
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And square area
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Adhesive, square area->
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And square area->
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Bonding, square area
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And square area->
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Adhesive, square area->
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And square area
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Adhesive, square area->
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And square area->
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Adhesive, square area->
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And square area->
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Adhesive, square area->
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And square area->
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And (5) bonding.
Further, on the basis of the fully unfolded configuration, a first configuration or a third configuration can be obtained by folding the bag for 1 time longitudinally, and a tenth configuration can be obtained by folding the bag further longitudinally; the tenth configuration may be further folded laterally to provide a thirteenth configuration or a fourteenth configuration, and further folding laterally may provide a fully folded configuration; on the basis of the fully unfolded configuration, a second configuration or a third configuration can be obtained by transversely folding for 1 time, and a ninth configuration can be obtained by transversely further folding; the ninth configuration may be further folded longitudinally to provide an eleventh or twelfth configuration, and further folding longitudinally may provide a fully folded configuration.
Further, the folding and unfolding driving mechanism is arranged to realize folding and releasing of the folding and unfolding driving rope through rotation of the reel under the action of the driving motor, so that unfolding and folding of the folding and unfolding antenna structure are realized; the folding and unfolding driving mechanism comprises 4 folding driving ropes, 4 unfolding driving ropes, an antenna upright post bracket, a motor mounting bracket, a driving motor and a motor reel; wherein, the driving motor is fixed on the antenna shell through the motor mounting bracket; the 4 folding driving ropes and the 4 unfolding driving ropes are wound on the motor reel through the through holes of the antenna upright post support.
Further, the number of the motors is 2, namely a motor A and a motor B,4 folding driving ropes are wound on a reel of the motor A, and 4 unfolding driving ropes are wound on a reel of the motor B; when the antenna is in a fully unfolded configuration, the length of each driving rope is recorded as the original length, and the original lengths of the 4 folding driving ropes are all equal and recorded as
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The method comprises the steps of carrying out a first treatment on the surface of the The original length of the 4 unfolding driving ropes is equal and is marked as +.>
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；
Folding process of the antenna: when the antenna is in a fully unfolded configuration, the motor B is kept motionless, the motor A rotates anticlockwise, and the length of the 4 folding driving ropes is shortened, so that the antenna is converted from the unfolded configuration to the folded configuration; when the antenna is fully folded, the lengths of the 4 folding driving ropes are all
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The length of the 4 unfolding driving ropes is kept unchanged and is still +.>
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；
The unfolding process of the antenna comprises the following steps: when the antenna is in a fully folded configuration, the motor A is kept still, the motor B rotates anticlockwise, the lengths of the 4 unfolding driving ropes are shortened at the moment, the antenna structure is deformed, the antenna is converted into a critical state from the fully folded state, and the length of the unfolding driving ropes is recorded as
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The method comprises the steps of carrying out a first treatment on the surface of the On the basis, the motor B continues to rotate anticlockwise, and the length of the unfolding driving rope is further shortened to +.>
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The antenna structure is further deformed into configuration iii; at this time, the motor B is rotated clockwise so that the unwinding driving rope length is increased to the original length +.>
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The structural elasticity causes the antenna to switch to a fully deployed configuration.
Further, the number of the motors is 3, namely a motor A, a motor B and a motor C, a first folding driving rope and a third folding driving rope in the four folding driving ropes are wound on a reel of the motor A, a second folding driving rope and a fourth folding driving rope are wound on a reel of the motor B, and 4 unfolding driving ropes are wound on a reel of the motor C, so that the antenna structure can be completely unfolded by controlling the forward and reverse rotation of the motor C; by controlling only the motor a, a transition of the antenna structure from the fully deployed state to the ninth configuration can be achieved; by controlling only the motor B, a transition of the antenna structure from the fully deployed state to the tenth configuration can be achieved; by controlling motor a and motor B simultaneously, the antenna structure may be changed from a fully deployed state to a fully folded configuration.
Further, the number of the motors is 5, namely a motor A, a motor B, a motor C, a motor D and a motor E; winding 4 folding driving ropes on the winding wheels of the motors A to D respectively, and winding 4 unfolding driving ropes on the winding wheel of the fifth motor E; the antenna structure can be completely unfolded by controlling the forward and reverse rotation of the motor E; the antenna structure may be changed from the fully deployed state to any one of the first to fourth configurations by controlling only one of the motors a to D, and from the fully deployed state to any one of the fifth to fourteenth configurations by simultaneously controlling both motors a to D.
Further, the folded antenna structure is made of flexible insulating materials, metal patches are covered on the flexible insulating materials, and the programmable design of the radio frequency of the folded antenna is realized through the regulation and control of the metal patches.
The self-sustaining reconfigurable planar folded antenna inspired by the paper folding provided by the invention has a plurality of different stable configurations, and the system has a plurality of stable configurations in the process of transition from the fully folded configuration to the fully unfolded configuration. Once switched to a certain stable configuration, the structure itself is able to maintain the current configuration without the need for external power. Therefore, unlike the traditional paper folding antenna, the folding antenna provided by the invention has a plurality of stable configurations except the fully folded configuration and the fully unfolded configuration, and any stable configuration can realize the self-maintenance of the system without energy consumption. Specifically: (1) The antenna is in a folded and folded state in the transmission transportation/silence latency period, is in an unfolding working state in the in-orbit task execution period, and has the characteristic of large unfolding and folding ratio, so that the satellite cluster has multiple performances such as structural stealth, efficiency enhancement and the like and is supported; (2) The two-dimensional/three-dimensional antenna can change its geometry to control the variation of performance parameters over time and achieve versatility; (3) The antenna array may change its trajectory, shape and topology to achieve frequency band adjustment, optimal beam forming, beam steering, scan range switching, etc.
Drawings
Fig. 1 shows a schematic diagram of a fully deployed configuration of a folded antenna structure in accordance with an embodiment of the present invention;
fig. 2 shows a schematic diagram of a fully folded configuration of a folded antenna structure in accordance with an embodiment of the present invention;
fig. 3 shows a schematic plan view of a folded antenna structure according to an embodiment of the invention;
fig. 4 shows a panel numbering schematic of the fully unfolded state (a) and the fully folded state (b) of the folded antenna structure in an embodiment according to the invention;
fig. 5 shows a schematic diagram of 16 steady state configurations of a folded antenna structure in accordance with an embodiment of the invention;
fig. 6 shows a schematic diagram of a steady-state first configuration of a folded antenna structure in accordance with an embodiment of the invention;
fig. 7 shows a schematic diagram of a steady-state fifth configuration of a folded antenna structure in accordance with an embodiment of the invention;
fig. 8 shows a first form of a fully deployed state diagram of a reconfigurable planar folded array antenna in accordance with an embodiment of the present invention;
fig. 9 is a partially folded schematic illustration of a first form of a reconfigurable planar folded array antenna in accordance with an embodiment of the invention;
fig. 10 shows a second form of a fully deployed state diagram of a reconfigurable planar folded array antenna in accordance with an embodiment of the present invention;
FIG. 11 is a partially folded schematic illustration of a second form of a reconfigurable planar folded array antenna in accordance with an embodiment of the invention;
FIG. 12 is a schematic diagram showing a programmable design of implementing radio frequency characteristics of a folded antenna by adjusting the number and position of metal patches according to an embodiment of the present invention;
fig. 13 shows a schematic diagram of a cord drive design of a reconfigurable planar folded array antenna in accordance with an embodiment of the invention;
FIG. 14 shows a schematic diagram of a folded drive line design in accordance with an embodiment of the invention;
FIG. 15 shows a schematic diagram of an unwind drive cord design in accordance with an embodiment of the present invention;
FIG. 16 illustrates a motor driven antenna fold display through a drive cord according to an embodiment of the present invention;
fig. 17 shows a top view of the position of a folded driving cord on an antenna structure in accordance with an embodiment of the present invention;
FIG. 18 is a schematic diagram showing driving schemes corresponding to different numbers of motors according to an embodiment of the present invention;
FIG. 19 is a schematic view showing the installation position of a folded antenna on a satellite panel according to an embodiment of the invention;
fig. 20 shows a schematic diagram of the overall composition of a folded antenna system according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Specific embodiments of the present invention are described in detail below with reference to fig. 1-20. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The invention provides a reconfigurable multistable folded antenna system, which is an expandable satellite-borne antenna, and the overall composition and functions of each part are as follows:
the reconfigurable multistable folded antenna system in this embodiment mainly includes four parts, namely a folded antenna structure, a folded driving mechanism, a transceiver and an antenna housing. The folded antenna structure is positioned outside the satellite cabin, and driving components such as a motor, a transceiver, an antenna shell and the like are positioned in the satellite cabin, and the outside of the satellite cabin is connected with the components in the satellite cabin through an antenna upright post bracket.
The self-sustaining reconfigurable planar folding structure proposed by the present invention is designed inspired by folding paper, and is formed by bonding two plates in certain areas, and the fully unfolded configuration is shown in fig. 1. Wherein the upper plate is defined as a first creasing plate, the lower plate is defined as a second creasing plate, and the materials, thicknesses and sizes of the first creasing plate and the second creasing plate are identical to those of crease positions, so that the folded antenna has a fully unfolded configuration, a fully folded configuration and 14 partially folded stable configurations, and the folded antenna structure is converted between various configurations by a folded driving mechanism.
The folded antenna structure is divided into a central panel, an edge panel and a connecting panel, wherein the connecting panel is positioned between the central panel and the edge panel, and a plurality of folds are formed on the connecting panel and the edge panel, so that the connecting panel and the edge panel can be folded and deformed.
For the first indentation plate, a quadrilateral
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The inner area is empty (i.e. no board filling), the first creasing board has 4 kinds of 24 folds in total, the first kind of folds is +.>
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The third kind of folds are
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The fourth crease is->
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Similarly, for the second indentation plate, a quadrilateral
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Quadrilateral shape
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The inner area is empty (i.e. no board filling), the first creasing board has 4 kinds of 24 folds in total, the first kind of folds is +.>
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The second kind of crease is->
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The third crease is->
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. The 9 square areas of the first indentation plate and the second indentation plate are bonded into a whole, and are respectively square areas +.>
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And square area
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And square area->
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And (5) bonding.
The structure shown in fig. 1 has a foldable nature. To be used for
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The area being exemplified by a square
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Moving to the right in the horizontal direction, the structure is folded in the horizontal direction, rectangular area +.>
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are respectively turned over in rectangle->
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Between them. Thus, for the planar folded structure shown in fig. 1, its fully folded configuration is shown in fig. 2.
It should be noted that in FIG. 1
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There are no folds in these places and the structure has a significant bending stiffness in the direction perpendicular to the plane of the structure. The structural rigidity of these places is thus such that they are mechanically in a stable equilibrium state, both in the fully unfolded configuration and in the fully folded configuration. Reflected in the elastic potential energy of the structure, both the fully deployed configuration and the fully folded configuration are at a local energy minimum. The structure can be stably in the two configuration states without the maintenance of external force, and the current configuration can be maintained even if external small disturbance exists.
The folded structure is dimensioned as shown in fig. 3, the structure having symmetry as a whole. For one of the edges of the strip,
Figure SMS_170
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Figure SMS_171
，/>
Figure SMS_172
Thickness registration of each indentation plate (including first indentation plate and second indentation plate)And is w. To achieve complete unfolding and folding of the folded structure, it is geometrically necessary to ensure: />
Figure SMS_173
For convenience of description, fig. 4 gives panel numbers of respective regions of the fully unfolded state of the folded structure, wherein fig. 4 (a) is respective panels exposed to the outside in the fully unfolded configuration, and fig. 4 (B) is respective panels exposed to the outside in the fully folded configuration. As can be seen from comparison, only 9 diagonally shaded areas are exposed (i.e. area (2), area (4), area (6), area (8), area A2, area A4, area C2, area C4) in the fully folded configuration, while 24 areas are exposed in addition to the 9 diagonally shaded areas in the fully unfolded configuration, i.e. area A1-area A6, area motor B1-area motor B6, area C1-area C6, and area D1-area D6.
Fig. 5 shows, based on the folding characteristics of the folded structure in both the transverse and longitudinal directions, a total of 16 stable configurations of the structure, including a fully folded configuration, a fully unfolded configuration, and stable first through fourteenth configurations. According to the analysis of the elastic potential energy of the structure, the 16 configurations shown in fig. 5 are all at local minimum points of the elastic potential energy of the structure, and thus all the 16 configurations are stable. The structure can be stably in the two configuration states without the maintenance of external force, and the current configuration can be maintained even if external small disturbance exists. Wherein the steady state first configuration and the steady state fifth configuration are shown in fig. 6 and 7, respectively.
On the basis of the fully unfolded configuration, a first configuration/third configuration can be obtained by folding 1 time in the longitudinal direction, and a tenth configuration can be obtained by folding further in the longitudinal direction. The tenth configuration may be further folded laterally to provide a thirteenth/fourteenth configuration, and further folding laterally may provide a fully folded configuration.
On the basis of the fully unfolded configuration, a transverse folding 1 time can obtain a second configuration/a third configuration, and a transverse further folding can obtain a ninth configuration. The ninth configuration may be further folded longitudinally to provide an eleventh/twelfth configuration, and further folding longitudinally may provide a fully folded configuration.
It should be noted that, for the same configuration, the panel serial number exposed to the outside may not be unique and is related to the folding sequence. Taking the seventh configuration as an example, there are two possibilities for the panel number in the lower left corner, either C2 or B4. The lower left corner panel number C2 when folded from the third configuration to the seventh configuration; however, when folded from the second configuration to the seventh configuration, the lower left panel is numbered motor B4. Similarly, for the twelfth configuration, there are two possibilities for both the lower left and lower right corner panels numbered. For the thirteenth configuration, there are two possibilities for both the upper left corner panel and the lower left corner panel numbered. For the fully folded configuration, there are two possibilities for the corresponding panel sequence numbers, upper left, lower left, upper right, lower right.
In summary, for a self-sustaining reconfigurable planar folded antenna, geometrically, its unidirectional maximum spread/receive ratio is 7:3 and area maximum spread/receive ratio is 49:9, 6 antenna array envelope areas are realized, and a total of 16 different antenna configurations (including: fully folded configuration, fully unfolded configuration, and 14 partially folded stable configurations) are constructed. For example, if the antenna is 60mm long on the side of the fully folded configuration, the area is 3600mm 2 The side of the fully deployed configuration was 140mm and the area was 19600mm2.
The antenna in the embodiment realizes the programmable design of the radio frequency of the folded antenna through metal patch regulation and control. Physically, since the above 16 configurations are two-dimensional planar configurations, the radio frequency devices attached to the structure are required to be patch type planar metal sheets, otherwise, structural interference will occur in the configuration switching process. The method is characterized in that the method is divided into two types, wherein the first type is that all the thin copper sheets are connected through a wire, and the second type is that all the thin copper sheets are not connected. The feeding position of the antenna can be selected at the center of the folding and unfolding structure, and can be selected at other positions as required.
For the first form, as shown in fig. 8, a total of 33 metal sheets are attached to 33 panels of the folded structure, each metal sheet is required to be smaller in size than each panel of the folded structure, and the metal sheets are bonded to the indentation plate-1 of the folded structure, so that the folded structure itself is required to be made of a nonmetallic insulating material. The metal sheet and the lead can be integrally prepared by adopting a flexible PC motor B circuit board. In the antenna unfolding and folding process, the wires are required to have good foldability, so that the smooth circuit among the copper sheets is ensured. Fig. 9 shows a schematic view of the partially folded state of the antenna.
For the second form, figures 10 and 11 show the antenna in its fully deployed and partially folded configurations, respectively. It can be seen that the copper sheets are not connected by wires.
In the above patch design, the metal patch achieves full coverage of 33 panels in total of the folded structure. According to the requirement of the radio frequency performance of the antenna, only one part of the panels can be selected for metal film coverage, and the other part of the panels does not cover the metal patch. Figure 12 shows a configuration when the number of metal patches is 17, the 17 metal patches being adhered to the edge and center panels, respectively, of the folded structure. Therefore, the programmable design of the radio frequency characteristics of the folded antenna can be realized through the regulation and control of the sticking number of the metal sheets and the panel position.
The motor and cord drive scheme for the reconfigurable multistable fold antenna is designed as follows:
the motor and rope drive aim is to achieve switching of the folded and unfolded configuration of the antenna. Fig. 13 shows a schematic diagram of an antenna cord driving design, in which the driving cords are divided into two types, namely, 4 folding driving cords and 4 unfolding driving cords, which are all arranged in a cross shape. The folding and unfolding switching of the antenna is realized through the folding and unfolding adjustment of the length of the driving rope.
For the folding driving rope, folding of the structure connected thereto is achieved by contracting the length of the folding driving rope, as shown in fig. 14. For the deployment driving rope, the deployment of the structure connected thereto is achieved by "contracting first and then elongating" the length of the deployment driving rope, as shown in fig. 15. The above-mentioned adjustment of the length of the driving rope may be achieved by a motor which may be centrally installed at the central position of the antenna, as shown in fig. 13.
Fig. 16 shows a design of an antenna folding and unfolding scheme by 4 driving ropes under the driving of motors A and B, and fig. 17 shows 4 antenna folding and unfolding schemesThe folded driving cord is in a specific position on the antenna structure (top view). Wherein, 4 folding drive ropes are all twined on motor A's reel, and 4 expansion drive ropes are all twined on motor B's reel. The length of each drive cord is noted as the original length if the antenna is in the fully deployed configuration. Therefore, the original lengths of the 4 folding driving ropes are equal, and the two driving ropes are marked as
Figure SMS_174
The method comprises the steps of carrying out a first treatment on the surface of the The original length of the 4 unfolding driving ropes is equal and is marked as +.>
Figure SMS_175
. The antenna is analyzed for folding and unfolding under motor drive.
(1) Folding process of the antenna: when the antenna is in the fully deployed configuration, motor B is held stationary and motor a rotates counterclockwise, the 4 fold drive lines are shortened in length, resulting in the antenna transitioning from the deployed configuration to the folded configuration. When the antenna is fully folded, the lengths of the 4 folding driving ropes are all
Figure SMS_176
The length of the 4 unfolding driving ropes is kept unchanged and is still +.>
Figure SMS_177
。
(2) The unfolding process of the antenna comprises the following steps: when the antenna is in the fully folded configuration, the motor A is kept still, the motor B rotates anticlockwise, the lengths of the 4 unfolding driving ropes are shortened at the moment, the antenna structure is deformed, the antenna is converted from the fully folded state to the critical state shown in fig. 15, namely the configuration ii, and the lengths of the 4 unfolding driving ropes are recorded as
Figure SMS_178
. On the basis, the motor B continues to rotate anticlockwise, and the length of the 4 unfolding driving ropes is further shortened to +.>
Figure SMS_179
The antenna structure is further deformed into configuration iii. At this time, the motor B rotates clockwise (reversely), so that 4 unwinding driving ropesLength is increased to original length +.>
Figure SMS_180
The structural elasticity causes the antenna to switch to a fully deployed configuration. From an energy perspective, the elastic potential energy of the unit increases and then decreases during the transition from the folded configuration to the unfolded configuration. That is, the fully folded configuration and the fully folded configuration correspond to two minima of the elastic potential energy of the structure, respectively, from the fully folded configuration to configuration ii in fig. 15, the elastic potential energy of the structure gradually increases; from configuration ii to the fully deployed configuration, the elastic potential energy of the structure gradually decreases. Thus, configuration ii is the local maximum point of the elastic potential energy of the structure, which upon crossing configuration ii will switch to the fully deployed configuration under the elastic action of the structure.
It can be seen that if the "two motor solution" presented by the solution of fig. 16 is adopted, then there are only two configurations of the folded antenna, a fully folded configuration and a fully unfolded configuration, respectively, as shown in fig. 18. On this basis, if the number of motors is further increased, the number of antenna steady-state configurations that can be achieved is further increased.
As shown in fig. 18, if the "three motor scheme" is adopted, i.e., the first folding driving rope and the third folding driving rope are wound on the reel of the motor a, the second folding driving rope and the fourth folding driving rope are wound on the reel of the motor B, and the 4 unwinding driving ropes are all wound on the reel of the motor C. Under the scheme, the antenna structure can be completely unfolded by controlling the forward and reverse rotation of the motor C; by controlling only the motor a, a transition of the antenna structure from the fully deployed state to the ninth configuration can be achieved; by controlling only the motor B, a transition of the antenna structure from the fully deployed state to the tenth configuration can be achieved; by controlling motor a and motor B simultaneously, the antenna structure may be changed from a fully deployed state to a fully folded configuration. Therefore, 4 antenna steady state configurations can be achieved using the "three motor approach.
Further, if the number of motors is further increased to 4, a "five motor scheme" is adopted, that is, 4 folding driving ropes are wound on reels of motors a to D, respectively, and 4 unfolding driving ropes are wound on reels of a fifth motor E. Under this scheme, through the positive and negative rotation of control motor E, can realize expanding antenna structure completely. The transition of the antenna structure from the fully deployed state to one of the first to fourth configurations may be achieved by controlling only one of the motors a-D, for example by controlling only motor a. The transition of the antenna structure from the fully deployed state to one of the fifth to fourteenth configurations may be achieved by controlling both motors a-D simultaneously, e.g. by controlling both motor a and motor B simultaneously.
From a combination of the above analyses of fig. 18, it can be seen that the number of independently controlled drive motors determines the number of antenna steady state configurations that can be achieved. Theoretically, the number of driving motors is not considered, and 16 stable antenna configurations are provided. If a double-motor driving scheme is adopted, under the combined action of a motor and a driving rope, 2 stable antenna configurations can be realized, namely a fully unfolded configuration and a fully folded configuration; if a three-motor driving scheme is adopted, under the combined action of a motor and a driving rope, 4 antenna steady-state configurations, namely a fully unfolded configuration, a fully folded configuration, a ninth configuration and 10, can be realized; if a four motor drive scheme is adopted, under the combined action of a motor and a drive rope, a total of 16 antenna steady-state configurations can be realized.
As shown in fig. 19 and 20, the reconfigurable multistable folded antenna system mainly includes four parts, namely a folded antenna structure 1, a folded driving mechanism, a transceiver, an antenna housing, and the like. The folded antenna structure is positioned outside the satellite cabin, and driving components such as a motor, a transceiver, an antenna shell and the like are positioned in the satellite cabin. As shown in fig. 19, the outside and inside components are connected by antenna mast brackets. The satellite cabin board needs to be provided with a through hole, and the antenna upright post bracket penetrates through the through hole of the satellite cabin board. The advantages of such a layout are: most parts of the folded antenna are located in the satellite cabin, so that the folded antenna is in a good temperature control range and is free from the influence of space irradiation and the like.
For the first part of the folded antenna system, the folded antenna structure 1 is mainly made of a flexible material, polyimide or other flexible insulating materials capable of bearing high and low temperatures can be selected in consideration of space irradiation and high and low temperatures, and the metal patch shown in fig. 8-12 is covered above the flexible insulating materials, so that the radio frequency requirement of the antenna is met.
The second part of the folding antenna system, namely the folding driving mechanism, mainly consists of 4 folding driving ropes (2, 3,4, 5), 4 unfolding driving ropes (6, 7,8, 9), an antenna upright post bracket 10, a motor mounting bracket 12, driving motors (17, 18), motor reels (13, 14) and the like. Wherein, driving motor passes through the motor installing support, fixes on the antenna external shell. The 4 folding driving ropes and the 4 unfolding driving ropes pass through the through holes of the antenna upright post support and are wound on the motor reel. The design of the "two-motor driving scheme" is shown in fig. 19, and on the basis of the design, the number of driving motors is increased, and the design can be further expanded into a "three-motor driving scheme" and a "four-motor driving scheme" and the like. The folding and unfolding driving mechanism has the functions of folding and unfolding the driving rope and releasing the driving rope through rotation of the reel under the action of the driving motor, so that the antenna structure is unfolded and folded.
The third part of the folded antenna system, i.e. the transceiver and the antenna housing, etc., mainly consists of the transceiver and the control board 15, the antenna electrical interface 16, the antenna housing 19, the housing mounting hole 11, etc. The transceiver and the control board 15 are mainly responsible for sending control instructions to the driving motor and sending and receiving radio frequency signals of the antenna. It should be noted that the radio frequency cable between the transceiver and the folded antenna structure is not shown in fig. 19. The antenna shell mainly provides a mounting base for an antenna driving mechanism, a transceiver, a control board and the like, and plays a role in protecting parts in the antenna. The upper surface of the antenna shell is provided with 8 mounting holes, and the purpose is to fixedly connect the antenna shell with the lower surface of the cabin board.
(1) The invention provides a self-sustaining reconfigurable plane folding structure inspired by paper folding, which is formed by bonding two plates in certain areas, and the configuration of the folding structure when the folding structure is fully unfolded is as shown in figure 1The fully folded configuration is shown in figure 2. The structure has symmetry as a whole. It should be noted that in FIG. 1
Figure SMS_182
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Figure SMS_188
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Figure SMS_190
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Figure SMS_183
And->
Figure SMS_187
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Figure SMS_191
、
Figure SMS_193
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Figure SMS_181
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Figure SMS_185
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Figure SMS_189
、/>
Figure SMS_192
、/>
Figure SMS_184
There are no folds in these places and the structure has a significant bending stiffness in the direction perpendicular to the plane of the structure. The structural rigidity of these places is thus such that they are mechanically in a stable equilibrium state, both in the fully unfolded configuration and in the fully folded configuration. Reflected in the elastic potential energy of the structure, both the fully deployed configuration and the fully folded configuration are at a local energy minimum. The structure can be stably in the two configuration states without the maintenance of external force even if the external force exists The disturbance is small and the current configuration can still be maintained. In order to achieve complete unfolding and folding of the folded structure, geometrical assurance is required>
Figure SMS_186
Sizing refers to fig. 3.
(2) By regulating and controlling the folding sequence of the self-maintaining reconfigurable plane folding and unfolding structure, the unidirectional maximum folding and unfolding ratio of the self-maintaining reconfigurable plane folding and unfolding structure can be 7:3, the area maximum folding and unfolding ratio of the self-maintaining reconfigurable plane folding and unfolding structure is 49:9, 6 antenna array envelope areas are realized, and 16 different antenna configurations (including a fully folded configuration, a fully unfolded configuration and 14 partially folded stable configurations) are constructed. According to the analysis of the elastic potential energy of the structure, the 16 configurations shown in fig. 5 are all at local minimum points of the elastic potential energy of the structure, and thus all the 16 configurations are stable. The structure can be stably in the two configuration states without the maintenance of external force, and the current configuration can be maintained even if external small disturbance exists.
(3) The antenna folding and unfolding sequence requires that referring to fig. 5, the folding direction is divided into two directions of the transverse direction and the longitudinal direction. Specifically, on the basis of the fully unfolded configuration, the first configuration or the third configuration can be obtained by folding 1 time in the longitudinal direction, and the tenth configuration can be obtained by folding further in the longitudinal direction. The tenth configuration may be further folded laterally to provide a thirteenth configuration or a fourteenth configuration, and further folding laterally may provide a fully folded configuration.
(4) On the basis of the fully unfolded configuration, a second configuration or a third configuration can be obtained by transverse folding for 1 time, and a ninth configuration can be obtained by transverse further folding. The ninth configuration may be further folded longitudinally to provide an eleventh or twelfth configuration, and further folding longitudinally may provide a fully folded configuration.
(5) Physically, since the above 16 configurations are two-dimensional planar configurations, the rf devices attached to the structure are required to be planar metal sheets (patch type), otherwise, structural interference will occur during the configuration switching process. The first antenna is formed by connecting each piece of copper sheet through a wire, as shown in fig. 8, wherein the size of each piece of copper sheet is required to be smaller than that of each panel of the folded structure, and the folded structure is required to be made of nonmetallic insulating materials by bonding and unfolding the copper sheet on a first indentation plate of the folded structure. The copper sheet and the lead can be integrally prepared by adopting a flexible PC motor B circuit board. In the antenna unfolding and folding process, the wires are required to have good foldability, so that the smooth circuit among the copper sheets is ensured. Fig. 9 shows a schematic view of the partially folded state of the antenna.
(6) The antenna metal patch form can also be selected such that the individual pieces of copper sheet are not connected by wires, and figures 10 and 11 show the configuration of the antenna in its fully unfolded and partially folded states, respectively.
(7) According to the requirement of the radio frequency performance of the antenna, only one part of the panels can be selected for metal film coverage, and the other part of the panels does not cover the metal patch. Fig. 12 shows a configuration when the number of metal patches is 17, the 17 metal patches being adhered to the edge panel and the center panel of the folded structure, respectively. Therefore, the programmable design of the radio frequency characteristics of the folded antenna can be realized through the regulation and control of the sticking number of the metal sheets and the panel position.
(8) The antenna rope driving design is shown in fig. 13, and the driving ropes are divided into 4 folding driving ropes and 4 unfolding driving ropes, which are respectively arranged in a cross shape. The folding and unfolding switching of the antenna is realized through the folding and unfolding adjustment of the length of the driving rope. For the folding driving rope, folding of the structure connected thereto is achieved by contracting the length of the folding driving rope, as shown in fig. 14. For the deployment driving rope, the deployment of the structure connected thereto is achieved by "contracting first and then elongating" the length of the deployment driving rope, as shown in fig. 15. The adjustment of the length of the driving cord of the reconfigurable folded antenna may be achieved by a motor which may be centrally mounted at the center of the antenna, as shown in fig. 12.
(9) For a folded antenna structure, if a "dual motor drive scheme" is employed, wherein 4 folded drive cords are all wound on the reel of motor A and 4 unfolded drive cords are all wound on the reel of motor B. The length of each drive cord is noted as the original length if the antenna is in the fully deployed configuration. Therefore, the original lengths of the 4 folding driving ropes are equal, and the two driving ropes are marked as
Figure SMS_194
The method comprises the steps of carrying out a first treatment on the surface of the The original length of the 4 unfolding driving ropes is equal and is marked as +.>
Figure SMS_195
. The antenna is analyzed for folding and unfolding under motor drive. The folding process of the antenna is as follows: when the antenna is in the fully deployed configuration, motor B is held stationary and motor a rotates counterclockwise, the 4 fold drive lines are shortened in length, resulting in the antenna transitioning from the deployed configuration to the folded configuration. When the antenna is fully folded, the lengths of the 4 folding driving ropes are all +.>
Figure SMS_196
The length of the 4 unfolding driving ropes is kept unchanged and is still +.>
Figure SMS_197
. The unfolding process of the antenna is as follows: when the antenna is in the fully folded configuration, the motor A is kept still, the motor B rotates anticlockwise, the lengths of the 4 unfolding driving ropes are shortened at the moment, the antenna structure is deformed, the antenna is converted from the fully folded state to the critical state shown in fig. 15, namely the configuration ii, and the lengths of the 4 unfolding driving ropes are recorded as- >
Figure SMS_198
. On the basis, the motor B continues to rotate anticlockwise, and the length of the 4 unfolding driving ropes is further shortened to +.>
Figure SMS_199
The antenna structure is further deformed into configuration iii. At this time, the motor B is rotated clockwise (reversed) so that the length of the 4 unwinding driving ropes is increased to the original length +.>
Figure SMS_200
The structural elasticity causes the antenna to switch to a fully deployed configuration.
(10) The folded antenna structure may be designed by adopting a three-motor driving scheme, a four-motor driving scheme and the like besides adopting a double-motor driving scheme, as shown in fig. 18. If a "two motor solution" is employed, the folded antenna has only two configurations, a fully folded configuration and a fully unfolded configuration, respectively. On this basis, if the number of motors is further increased, the number of antenna steady-state configurations that can be achieved is further increased. The number of independently controlled drive motors determines the number of antenna steady-state configurations that can be achieved. Theoretically, the number of driving motors is not considered, and 16 stable antenna configurations are provided. If a double-motor driving scheme is adopted, under the combined action of a motor and a driving rope, 2 stable antenna configurations can be realized, namely a fully unfolded configuration and a fully folded configuration; if a three-motor driving scheme is adopted, under the combined action of a motor and a driving rope, 4 antenna steady-state configurations, namely a fully unfolded configuration, a fully folded configuration, a ninth configuration and 10, can be realized; if a four motor drive scheme is adopted, under the combined action of a motor and a drive rope, a total of 16 antenna steady-state configurations can be realized.
(11) The design of the reconfigurable multistable folded antenna system is proposed, which mainly comprises four parts, namely a folded antenna structure, a folded driving mechanism, a transceiver, an antenna housing and the like, as shown in fig. 19. The folded antenna structure is positioned outside the satellite cabin, and driving components such as a motor, a transceiver, an antenna shell and the like are positioned in the satellite cabin. As shown in fig. 19, the outside and inside components are connected by antenna mast brackets. The satellite cabin board needs to be provided with a through hole, and the antenna upright post bracket penetrates through the through hole of the satellite cabin board. The advantages of such a layout are: most parts of the folded antenna are located in the satellite cabin, so that the folded antenna is in a good temperature control range and is free from the influence of space irradiation and the like.
(12) For a rope drive system, in a specific implementation, the solutions shown in fig. 19 and 20 are employed. The driving motor A and the motor B are fixed on the antenna outer shell through a motor mounting bracket. The 4 folding driving ropes and the 4 unfolding driving ropes pass through the through holes of the antenna upright post support and are wound on the motor reel. The design schematic of the "two-motor driving scheme" is shown in fig. 19 and 20, and on the basis of the design schematic, the number of driving motors is increased, and the design schematic can be further expanded into the "three-motor driving scheme" and the "four-motor driving scheme" and the like. The folding and unfolding driving mechanism has the function of realizing folding and releasing of the folding/unfolding driving rope through rotation of the reel under the action of the driving motor, so that unfolding and folding of the antenna structure are realized.
(13) The transceiver and antenna housing portions of the folded antenna system are comprised of mainly transceiver and control board 15, antenna electrical interface 16, antenna housing 19, housing mounting holes 11, and the like. The transceiver, the control board and the like are mainly responsible for sending control instructions to the driving motor and sending and receiving antenna radio frequency signals. It should be noted that the radio frequency cable between the transceiver and the folded antenna structure is not shown in fig. 19. The antenna shell mainly provides a mounting base for an antenna driving mechanism, a transceiver, a control board and the like, and plays a role in protecting parts in the antenna. The upper surface of the antenna shell is provided with 8 mounting holes, and the purpose is to fixedly connect the antenna shell with the lower surface of the cabin board.
In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the different embodiments or examples described in this specification and the features therein may be combined or combined by those skilled in the art without creating contradictions.
While embodiments of the present invention have been shown and described, it will be understood that the embodiments are illustrative and not to be construed as limiting the invention, and that various changes, modifications, substitutions and alterations may be made by those skilled in the art without departing from the scope of the invention.

Claims (10)

1. A reconfigurable multistable fold antenna system comprising a fold antenna structure located outside a satellite compartment; an antenna shell, a folding and unfolding driving mechanism and a transceiver which are positioned in the satellite cabin; and an antenna mast bracket connecting the folded antenna structure and the antenna housing; wherein, the liquid crystal display device comprises a liquid crystal display device,
the folded antenna structure comprises a first impressing plate and a second impressing plate which are overlapped and partially connected, so that the folded antenna at least has a fully unfolded configuration and a fully folded configuration, and the folded antenna structure is switched between the fully unfolded configuration and the fully folded configuration through a folded driving mechanism.
2. The reconfigurable multistable folded antenna system of claim 1 wherein the folded antenna structure is divided into a center panel, an edge panel, and a connecting panel, the connecting panel being positioned between the center panel and the edge panel, the connecting panel and the edge panel being provided with a plurality of folds to enable folding variants of the connecting panel and the edge panel to enable the folded antenna structure to have a fully unfolded configuration, a fully folded configuration, and a plurality of stable configurations.
3. The reconfigurable multistable folded antenna system of claim 2 wherein the first creasing plate and the second creasing plate cause the formed folded antenna structure to have 16 configurations including a fully unfolded configuration, a fully folded configuration, and 14 partially folded stable configurations, achieving 6 antenna array envelope areas.
4. A reconfigurable multistable folded antenna system according to claim 3 wherein the first and second creasing plates are identical in location to the folds, each having 24 folds, the 24 folds of the first creasing plate being classified into 4 categories, the first category of folds being
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The second kind of crease is->
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The third crease is->
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、
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The fourth crease is->
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、
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The method comprises the steps of carrying out a first treatment on the surface of the In the first indentation plate, quadrilateral ++>
Figure QLYQS_23
Quadrilateral->
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Quadrilateral shape
Figure QLYQS_28
Quadrilateral->
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The inner region is empty;
correspondingly, the 24 folds of the second creasing plate are also classified into 4 types, the first type of folds being
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The second kind of crease is->
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The third crease is->
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、
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The fourth crease is->
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The method comprises the steps of carrying out a first treatment on the surface of the In the second indentation plate, quadrilateral ++>
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Quadrilateral->
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Quadrilateral->
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Quadrilateral->
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The inner area is empty, and 9 square areas of the first indentation plate and the second indentation plate are bonded into a whole and are respectively square areas +. >
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And square area->
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Adhesive, square area->
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And square area->
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Bonding, square area
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And square area->
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Adhesive, square area->
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And square area->
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Adhesive, square area->
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And square area->
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Adhesive, square area->
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And square area
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Adhesive, square area->
Figure QLYQS_37
And square area->
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Bonding, square area
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And square area->
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And (5) bonding.
5. The reconfigurable multistable folded antenna system of claim 4 wherein upon a fully unfolded configuration, a first configuration or a third configuration is obtained by folding longitudinally 1 time, and a tenth configuration is obtained by folding longitudinally further; the tenth configuration may be further folded laterally to provide a thirteenth configuration or a fourteenth configuration, and further folding laterally may provide a fully folded configuration;
on the basis of the fully unfolded configuration, a second configuration or a third configuration can be obtained by transversely folding for 1 time, and a ninth configuration can be obtained by transversely further folding; the ninth configuration may be further folded longitudinally to provide an eleventh or twelfth configuration, and further folding longitudinally may provide a fully folded configuration.
6. The reconfigurable multistable fold antenna system according to claim 1 wherein the fold drive mechanism is arranged to effect folding and unfolding of the fold antenna structure by the folding and unfolding of the fold drive cord by rotation of the reel under the drive of the drive motor; the folding and unfolding driving mechanism comprises 4 folding driving ropes, 4 unfolding driving ropes, an antenna upright post bracket, a motor mounting bracket, a driving motor and a motor reel; wherein, the driving motor is fixed on the antenna shell through the motor mounting bracket; the 4 folding driving ropes and the 4 unfolding driving ropes are wound on the motor reel through the through holes of the antenna upright post support.
7. The reconfigurable multistable fold-and-unfold antenna system according to claim 6 wherein the number of motors is 2, motor a and motor B, respectively, with 4 fold-and-unfold drive cords wound on motor a reel and 4 fold-and-unfold drive cords wound on motor B reel; when the antenna is in a fully unfolded configuration, the length of each driving rope is recorded as the original length, and the original lengths of the 4 folding driving ropes are all equal and recorded as
Figure QLYQS_73
The method comprises the steps of carrying out a first treatment on the surface of the 4 unfolding drivesThe original lengths of the ropes are equal and marked as +.>
Figure QLYQS_74
；
Folding process of the antenna: when the antenna is in a fully unfolded configuration, the motor B is kept motionless, the motor A rotates anticlockwise, and the length of the 4 folding driving ropes is shortened, so that the antenna is converted from the unfolded configuration to the folded configuration; when the antenna is fully folded, the lengths of the 4 folding driving ropes are all
Figure QLYQS_75
The length of the 4 unfolding driving ropes is kept unchanged and is still +.>
Figure QLYQS_76
；
The unfolding process of the antenna comprises the following steps: when the antenna is in a fully folded configuration, the motor A is kept still, the motor B rotates anticlockwise, the lengths of the 4 unfolding driving ropes are shortened at the moment, the antenna structure is deformed, the antenna is converted into a critical state from the fully folded state, and the length of the unfolding driving ropes is recorded as
Figure QLYQS_77
The method comprises the steps of carrying out a first treatment on the surface of the On the basis, the motor B continues to rotate anticlockwise, and the length of the unfolding driving rope is further shortened to +. >
Figure QLYQS_78
The antenna structure is further deformed into configuration iii; at this time, the motor B is rotated clockwise so that the unwinding driving rope length is increased to the original length +.>
Figure QLYQS_79
The structural elasticity causes the antenna to switch to a fully deployed configuration.
8. The reconfigurable multistable fold and unfold antenna system according to claim 6, wherein the number of motors is 3, motor a, motor B and motor C, respectively, a first fold drive rope and a third fold drive rope of the four fold drive ropes are wound on a reel of motor a, a second fold drive rope and a fourth fold drive rope are wound on a reel of motor B, and 4 unfold drive ropes are wound on a reel of motor C, whereby complete unfolding of the antenna structure can be achieved by controlling the forward and reverse rotation of motor C; by controlling only the motor a, a transition of the antenna structure from the fully deployed state to the ninth configuration can be achieved; by controlling only the motor B, a transition of the antenna structure from the fully deployed state to the tenth configuration can be achieved; by controlling motor a and motor B simultaneously, the antenna structure may be changed from a fully deployed state to a fully folded configuration.
9. The reconfigurable multistable folded antenna system of claim 6 wherein the number of motors is 5, motor a, motor B, motor C, motor D and motor E, respectively; winding 4 folding driving ropes on the winding wheels of the motors A to D respectively, and winding 4 unfolding driving ropes on the winding wheel of the fifth motor E; the antenna structure can be completely unfolded by controlling the forward and reverse rotation of the motor E; the antenna structure may be changed from the fully deployed state to any one of the first to fourth configurations by controlling only one of the motors a to D, and from the fully deployed state to any one of the fifth to fourteenth configurations by simultaneously controlling both motors a to D.
10. The reconfigurable multistable folded antenna system according to any of claims 1-9 wherein the folded antenna structure is made of a flexible insulating material covered with a metal patch, the programmable design of the folded antenna radio frequency being achieved by metal patch tuning.
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