Time-sharing wave-transparent antenna structure

Abstract

The application belongs to the technical field of antennas, and particularly relates to a time-sharing wave-transparent antenna structure. The antenna structure comprises a fixing base, wherein an antenna is installed; an outer frame is matched and arranged outside the fixing base, and an opening corresponding to the radiation direction of the antenna is formed on the outer frame; a flexible piece is slidingly arranged in a gap between the fixing base and the outer frame, a shielding plating layer is arranged on a partial area of the surface of the flexible piece, so as to divide the surface of the flexible piece into a shielding area and a wave-transparent area; and a driving device is connected to the output end of the flexible piece, and is used for driving the flexible piece to reciprocatingly slide, so as to make the shielding area or the wave-transparent area correspond to the opening. The antenna radiation performance and the reduction of the radar scattering cross section cannot be both achieved. When the shielding area on the flexible piece shields the opening, electromagnetic shielding is achieved. The driving device drives the wave-transparent area on the flexible piece to align with the opening, so that the front of the antenna is exposed, electromagnetic waves are outwardly radiated, the switching between the two states of electromagnetic wave shielding and electromagnetic wave penetration is completed, and the use performance of the antenna is not affected.

Description

Technical Field

[0001] This invention belongs to the field of antenna technology, specifically relating to a time-division transparent antenna structure. Background Technology

[0002] Radar cross section (RCS) is a key physical quantity that measures a target's ability to backscatter radar waves. It is not the target's geometric area, but rather the equivalent area representing the intensity of electromagnetic waves scattered by the target in the radar receiving direction.

[0003] At present, with the increasing requirements for stealth, the antennas on aircraft, as strong scattering sources, need to be treated for stealth. Usually, when designing antennas for stealth, there will be a certain impact on electrical performance. Currently, the structural integration strategy is often adopted: embedding the antenna into the curved surface of the fuselage to reduce specular scattering from the protruding structure, while optimizing the layout of the radiating elements through simulation to ensure signal coverage.

[0004] However, poor shielding can interfere with the aircraft's internal electronic equipment, and poor performance can lead to unstable signals in complex environments or even expose stealth targets. On the other hand, excessive shielding can also affect antenna radiation performance. Therefore, how to reduce the radar cross section of a target without affecting its radiation performance has become a crucial issue. Summary of the Invention

[0005] To address the shortcomings of existing technologies, a time-division transparent antenna structure is provided to solve the problem of not being able to simultaneously improve antenna radiation performance and reduce radar cross-section.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: a time-division transparent antenna structure, comprising: A mounting base in which the antenna is installed; An outer frame is fitted outside the mounting base, and an opening corresponding to the antenna radiation direction is formed on the outer frame; A flexible component is slidably disposed in the gap between the fixed base and the outer frame. A shielding coating is provided on a portion of the surface of the flexible component to divide the surface of the flexible component into a shielding area and a wave-transparent area. A driving device, the output end of which is connected to the flexible member, is used to drive the flexible member to slide back and forth so that the shielding area or the wave-transmitting area corresponds to the opening.

[0007] Compared with existing technologies, the above technical solutions have the following beneficial effects: By forming an opening in the outer frame, the antenna can be easily installed in the mounting base to radiate electromagnetic waves and send signals outward. When the opening is blocked by the shielding area on the flexible component, the shielding coating adheres to the surface of the mounting base, simultaneously blocking the opening. This allows the shielding area to be completely conformal to the surface, achieving electromagnetic shielding. When operation is required, the driving device drives the wave-transparent area on the flexible component to align with the opening, exposing the front of the antenna and enabling outward radiation of electromagnetic waves. This completes the switching between electromagnetic wave shielding and electromagnetic wave penetration without affecting the antenna's performance.

[0008] Based on the above technical solution, the embodiments of this application can be further improved as follows: In one embodiment, the device further includes a traction rope, the two ends of which are respectively connected to the two ends of the flexible member, and the output end of the drive device is connected to the traction rope for transmission.

[0009] By using a traction rope, the flexible component can be extended and connected to the drive device. The flexible component can be moved by the traction rope, which not only makes the connection and transmission more convenient, but also makes the traction rope stronger and more reliable.

[0010] In one embodiment, a floating seat is further provided on the side of the fixed seat away from the opening. An elastic element is provided between the floating seat and the fixed seat. The traction rope passes through the floating seat and is connected to the output end of the drive device.

[0011] The elastic element enables the floating seat to form an elastic connection with the fixed seat. The floating method can improve the overall reliability and facilitate the transmission of driving force to the flexible element through the traction rope without affecting the flexible element. On the other hand, the elastic element can support the two ends of the flexible element and tighten them on the surface of the fixed seat, making it completely conformal to the surface.

[0012] In one embodiment, a guide pin is further included, with both ends of the guide pin respectively fitted into grooves formed between the floating seat and the fixed seat.

[0013] The floating motion direction of the floating seat and the fixed seat can be controlled in a suitable direction by using the guide pin.

[0014] In one embodiment, two floating seats and two traction ropes are provided. The output end of the drive device is connected to a drive shaft. Both ends of the drive shaft extend into the two floating seats and are provided with drive wheels. The traction rope passes through the floating seats and is connected to the drive wheels for transmission.

[0015] Two traction ropes are set up so that they can be pulled synchronously, ensuring that the flexible parts do not wrinkle during movement. The drive wheel facilitates the transmission of driving force of the drive device.

[0016] In one embodiment, two guide wheels for winding around the traction rope are rotatably disposed on the floating seat, and the guide wheels are offset toward both ends of the flexible member so that the outer contour of the guide wheels is located outside the outer contour of the floating seat.

[0017] By setting up guide wheels, the traction rope can move more smoothly, and the position of the guide wheels can prevent the traction rope from interfering with the floating seat.

[0018] In one embodiment, the drive wheel is located between the two guide wheels, the elastic element is a compression spring, and the drive wheel is offset toward the direction close to the elastic element, arranged in a triangular pattern with the two guide wheels.

[0019] The elastic element is set as a compression spring that can be compressed. The offset direction of the drive wheel is the direction of compression of the compression spring, so that the compression spring can always provide elastic force and ensure the floating effect.

[0020] In one embodiment, fixed rods are fixed to the edges of both ends of the flexible member, and the two fixed rods are respectively connected to the two ends of the traction rope.

[0021] By setting a fixing rod, the two ends of the flexible component can always be kept flat. In conjunction with the use of elastic components, the overall integrity of the flexible component is improved, and the stretched flexible component will not shift or deflect during movement.

[0022] In one embodiment, the fixing base and / or the outer frame are provided with a limiting groove corresponding to the extension direction of the gap to accommodate the fixing rod, and the ends of the fixing rod extending out of the limiting groove are provided with protrusions for locking.

[0023] On the one hand, the fastener can cooperate with the limiting groove to limit the movement of the flexible part and control the range of sliding of the flexible part. On the other hand, it can maintain the stability of the gap and facilitate the sliding of the flexible part. Moreover, the protrusions at both ends of the fixed rod can restrict the fixed rod in the limiting groove and prevent the fixed rod from axial displacement. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 for Figure 1 A top-view structural diagram.

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0028] Figure label: 1. Outer frame; 2. Fixing rod; 3. Elastic element; 4. Traction rope; 5. Guide wheel; 6. Reducer; 7. Drive motor; 8. Drive wheel; 9. Floating seat; 10. Guide pin; 11. End cap; 12. Flexible element; 13. Fixing seat; 14. Antenna; 15. Opening; 16. Drive shaft. Detailed Implementation

[0029] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0031] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] like Figure 1 As shown, the present invention provides a time-division transparent antenna structure, which includes: a fixed base 13, an outer frame 1, a flexible component 12, and a driving device.

[0034] An antenna is installed in the mounting base 13. The front of the antenna is used to radiate electromagnetic waves outward. As shown in the figure, the front of the antenna faces the arc-shaped surface on the left side of the mounting base 13. Correspondingly, the outer frame 1 is matched and disposed outside the mounting base 13, on the arc-shaped surface on the left side of the mounting base 13. An opening 15 corresponding to the radiation direction of the antenna is formed on the outer frame 1, so that the electromagnetic waves of the antenna can be radiated outward from this point.

[0035] Since both the fixed base 13 and the outer frame 1 are specifically formed, they form a very small gap between each other, which facilitates the passage of the flexible component 12. Specifically, the flexible component 12 is slidably disposed in the gap between the fixed base 13 and the outer frame 1. A shielding coating is provided on a portion of the surface of the flexible component 12 to divide the surface of the flexible component 12 into a shielding area and a wave-transparent area. The flexible component 12 can be implemented using a flexible skin, and the specific material can be Kevlar fiber cloth, etc., with a dielectric constant of about 3.85. In its natural state, the flexible skin can be used as a wave-transparent antenna radome, with this area corresponding to the uncoated area, while the other half with the shielding coating acts as a total reflection metal cover, forming a shielding area.

[0036] The output end of the drive device is connected to the flexible member 12 and is used to drive the flexible member 12 to slide back and forth so that the shielding area or the wave-transmitting area corresponds to the opening 15, thereby realizing the switching state.

[0037] By forming an opening 15 on the outer frame 1, the antenna 14, which is mounted in the mounting base 13, can radiate electromagnetic waves and send signals outward from this opening. When the shielding area on the flexible member 12 blocks the opening 15, the shielding coating adheres to the surface of the mounting base 13 and blocks the opening 15, thus achieving complete conformal conformity between the shielding area and the surface and realizing electromagnetic shielding. When it is needed to work, the driving device drives the wave-transparent area on the flexible member 12 to align with the opening 15, exposing the front of the antenna 14 and radiating electromagnetic waves outward. This completes the switching between the two states of electromagnetic wave shielding and electromagnetic wave penetration without affecting the performance of the antenna 14.

[0038] To facilitate the movement of the flexible component 12, a traction rope 4 is also included. The two ends of the traction rope 4 are respectively connected to the two ends of the flexible component 12. The output end of the drive device is connected to the traction rope 4 for transmission. The output end of the drive device is connected to the traction rope 4 for transmission, causing the traction rope 4 to move along its axial direction. The two ends of the flexible component 12 extend upward and downward along the surface of the fixed base 13, respectively. By connecting the two ends of the traction rope 4 to the two ends of the flexible component 12, the flexible component 12 is pulled to move up and down along the surface of the fixed base 13. The traction rope 4 can extend the flexible component 12 to connect with the drive device. The movement of the flexible component 12 is driven by the traction rope 4, which not only makes the connection and transmission more convenient, but also makes the traction rope 4 stronger and more reliable.

[0039] To reduce frictional resistance, the surfaces of the flexible component 12 that come into contact with the fixed base 13 are coated with a wear-resistant material.

[0040] It also includes a floating seat 9 disposed on the side of the fixed seat 13 away from the opening 15, that is, the floating seat 9 is located behind the radiation direction away from the antenna 14. An elastic element 3 is disposed between the floating seat 9 and the fixed seat 13. The traction rope 4 passes through the floating seat 9 and is connected to the output end of the drive device for transmission.

[0041] The elastic element 3 enables the floating seat 9 to form an elastic connection with the fixed seat 13. The floating method can improve the overall reliability and facilitate the transmission of driving force to the flexible element 12 through the traction rope 4 without affecting the flexible element 12. On the other hand, the setting of the elastic element 3 can support the two ends of the flexible element 12 and tighten it on the surface of the fixed seat 13, making it completely conformal to the surface. Moreover, the elastic element 3 can provide stable tension to the traction rope 4, which can prevent slippage.

[0042] To ensure that the floating direction of the floating seat 9 is within the required range, a guide pin 10 is also included. The two ends of the guide pin 10 are respectively matched and embedded in the grooves opened between the floating seat 9 and the fixed seat 13. The length of the guide pin is less than the total depth of the two grooves in the fixed seat 13 and the floating seat 9, so that the guide pin can play a guiding role, but at the same time, it will not allow the guide pin to extend into the bottom of the groove.

[0043] To ensure that the guiding direction of the guide pin remains balanced, each floating seat has two guide pins, which are arranged in parallel on both sides of the elastic element 3, and there are two sets of corresponding grooves.

[0044] Two floating seats 9 and two traction ropes 4 are provided. The two floating seats 9 are respectively located on both sides behind the fixed seat 13. The output end of the drive device is connected to a drive shaft 16. The two ends of the drive shaft 16 extend into the two floating seats 9 and are provided with drive wheels 8. The end of the drive shaft 16 is also provided with an end cap 11, which is fixed on the floating seat 9. The end rod is used to fix the two ends of the drive shaft 16. The drive shaft 16 synchronously drives the rotation of the drive wheels 8 in the two floating seats 9. The traction rope 4 passes through the floating seat 9 and is connected to the drive wheel 8. The traction rope 4 is set to two, and the two traction ropes 4 can achieve synchronous traction, ensuring that the flexible part 12 does not wrinkle during movement. The setting of the drive wheel 8 facilitates the transmission of the driving force of the drive device.

[0045] The drive unit includes a drive motor 7 and a reducer 6 located at the output end of the drive motor 7. A drive shaft 16 is connected in the reducer 6. The reducer 6 has a self-locking function. After the movable flexible part 12 is in place, it can be self-locked. The drive unit is located between two floating seats 9 and is specifically fixed on one of the floating seats 9.

[0046] Two guide wheels 5 are rotatably mounted on the floating seat 9 for winding around the traction rope 4. The guide wheels 5 are located on the floating seat 9 and are spaced apart vertically. The spaced guide wheels 5 correspond to the upper and lower ends of the flexible member 12, respectively. The guide wheels 5 are offset toward the ends of the flexible member 12 so that the outer contour of the guide wheels 5 is located outside the outer contour of the floating seat 9. By setting the guide wheels 5, the traction rope 4 can move more smoothly. At the same time, the position of the guide wheels 5 can avoid interference between the traction rope 4 and the floating seat 9.

[0047] The drive wheel 8 is located between the two guide wheels 5. The elastic element 3 is a compression spring. The drive wheel 8 is offset towards the elastic element 3 and arranged in a triangular shape with the two guide wheels 5. One end of the traction rope 4 is connected to one end of the flexible element 12. The other end of the traction rope 4 passes through the guide wheel 5, the drive wheel 8 and the other guide wheel 5 in sequence and is then connected to the other end of the flexible element 12. In this way, the elastic element 3 is set as a compression spring that can be compressed. The offset direction of the drive wheel 8 is the direction of compression of the compression spring, so that the compression spring can always provide elastic force and ensure the floating effect.

[0048] To ensure that the flexible component 12 remains unwrinkled when stretched, fixed rods 2 are fixed to the edges of both ends of the flexible component 12. The two fixed rods 2 and the flexible component 12 form a structure similar to a scroll and a canvas. The two fixed components can fully stretch the flexible component 12 when stretched. The two fixed rods 2 are connected to the two ends of the traction rope 4. The traction rope 4 drives the flexible component 12 to move back and forth as a whole. It is not easy to deviate during the process, and the two ends of the flexible component 12 are always kept flat. With the use of the elastic component 3, the overall integrity of the flexible component 12 is better, and the stretched flexible component 12 will not wrinkle during the movement.

[0049] Specifically, the fixing seat 13 and / or the outer frame 1 are provided with a limiting groove that matches and accommodates the fixing rod 2 in the extension direction of the gap. That is, the limiting groove can be opened on the side of the fixing seat 13 near the outer frame 1, or on the side of the outer frame 1 near the fixing seat 13, or half grooves can be opened on the opposite sides of the fixing seat 13 and the outer frame 1 to form a complete limiting groove. The opening direction of the limiting groove is axially set along the extension traction rope 4. The end of the limiting groove near the flexible member 12 can limit the fixing rod 2, but it is connected to the gap. Thus, while limiting the fixing rod 2, it facilitates the reciprocating movement of the flexible member 12 in the gap. The limiting groove limits the starting and ending positions of the reciprocating movement of the flexible member 12. On the one hand, the fixing member can cooperate with the limiting groove to play a limiting role and control the sliding range of the flexible member 12. On the other hand, it can play a role in maintaining the stability of the gap and facilitate the sliding of the flexible member 12 in it. The ends of the fixed rod 2 that extend out of the limiting groove are provided with protrusions for locking. The protrusions at both ends of the fixed rod 2 can restrict the fixed rod 2 in the limiting groove, preventing the fixed rod 2 from axial displacement. At the same time, it can also ensure that the fixed rod 2 will not shift along the axial direction when pulled by the traction rope 4, thus ensuring the smooth displacement of the flexible part 12.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A time-division multiplexing antenna structure, characterized in that, include: A mounting base in which the antenna is installed; An outer frame is fitted outside the mounting base, and an opening corresponding to the antenna radiation direction is formed on the outer frame; A flexible component is slidably disposed in the gap between the fixed base and the outer frame. A shielding coating is provided on a portion of the surface of the flexible component to divide the surface of the flexible component into a shielding area and a wave-transparent area. A driving device, the output end of which is connected to the flexible member, is used to drive the flexible member to slide back and forth so that the shielding area or the wave-transparent area corresponds to the opening; It also includes a traction rope, the two ends of which are respectively connected to the two ends of the flexible component, and the output end of the drive device is connected to the traction rope for transmission. It also includes a floating seat disposed on the side of the fixed seat away from the opening, an elastic element is disposed between the floating seat and the fixed seat, and the traction rope is connected to the output end of the drive device after passing through the floating seat.

2. The time-division transparent antenna structure according to claim 1, characterized in that, It also includes a guide pin, the two ends of which are respectively fitted into the grooves opened between the floating seat and the fixed seat.

3. The time-division transparent antenna structure according to claim 1, characterized in that, Two floating seats and two traction ropes are provided. The output end of the drive device is connected to a drive shaft. Both ends of the drive shaft extend into the two floating seats and are provided with drive wheels. The traction rope passes through the floating seats and is connected to the drive wheels for transmission.

4. The time-division transparent antenna structure according to claim 3, characterized in that, Two guide wheels are rotatably mounted on the floating seat for winding around the traction rope. The guide wheels are offset toward both ends of the flexible member so that the outer contour of the guide wheels is located outside the outer contour of the floating seat.

5. The time-division transparent antenna structure according to claim 4, characterized in that, The drive wheel is located between the two guide wheels, the elastic element is a compression spring, and the drive wheel is offset towards the elastic element, forming a triangular arrangement with the two guide wheels.

6. The time-division transparent antenna structure according to claim 1, characterized in that, The flexible component has fixing rods fixed to its two ends, and the two fixing rods are respectively connected to the two ends of the traction rope.

7. The time-division transparent antenna structure according to claim 6, characterized in that, The fixing base and / or the outer frame are provided with a limiting groove corresponding to the extension direction of the gap to accommodate the fixing rod, and the ends of the fixing rod that extend out of the limiting groove are provided with protrusions for locking.

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