Compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated material

Abstract

The invention relates to the technical field of electromagnetic communication, and discloses a compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminated material, and the device comprises a flexible feed circuit board, the two ends of the flexible feed circuit board are respectively connected with flat cable pins, the bottom surface of the flexible feed circuit board is connected with a flexible magnetoelectric mechanical antenna board, and the flexible magnetoelectric mechanical antenna board is connected with the flexible feed circuit board. The bottom surface of the flexible magnetoelectric mechanical antenna plate is connected with a flexible covering layer; an upper protection plate and a lower protection plate are further included. Through flexible arrangement of the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board and the flexible covering layer, the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board and the flexible covering layer can be matched with installation positions with various curvatures, and stable performance can still be kept in various complex mechanical environments. And meanwhile, the device can be conveniently mounted in equipment worn by a human body and various curved-surface equipment.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic communication technologies, and particularly to a compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminate material. Background Art

[0002] Very low frequency / extremely low frequency electromagnetic waves, by virtue of their long wavelength characteristics, exhibit excellent medium penetration capabilities, far exceeding those of electromagnetic waves in general communication frequency bands. This characteristic makes them have irreplaceable significant application values in lossy medium penetration communication fields such as cross-domain positioning, emergency communication, underwater information transmission, and submarine communication. Traditional electrical antennas rely on driving currents or voltages in conductors to generate electromagnetic resonance, resulting in antenna sizes being comparable to the electromagnetic wavelength. It is difficult to fundamentally and significantly reduce the size, weight, and power of very low frequency / extremely low frequency communication devices. For magnetoelectric mechanical antennas based on magnetoelectric composite materials, with the unique transmission form of "electrical energy - mechanical energy - magnetic energy", electromagnetic waves are generated and received through alternating magnetization oscillations. Since they operate in the electromechanical resonance state, their sizes are comparable to the mechanical wavelength. Compared with co-frequency electrical antennas, the size of very low frequency / extremely low frequency communication devices using magnetoelectric mechanical antenna technology can be reduced by 3 - 5 orders of magnitude. However, in the prior art, the following problems exist: Currently, magnetoelectric mechanical antennas generally adopt a rigid laminated structure as a solution for very low frequency / extremely low frequency compact and strong penetration wireless signal transmission devices. This rigid structure severely restricts the adaptability of compact and strong penetration wireless signal transmission devices at dynamic deformation interfaces. In scenarios where high portability and high conformability are required, their application and development are greatly restricted, and it is not convenient to meet the requirements for the flexibility and conformability of communication devices in complex and variable environments. For example, the rigid structure may not be convenient to install in curved surface devices or wearable devices. Summary of the Invention

[0003] The purpose of the present invention is to provide a compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminate material to solve the above problems and overcome the defects of the prior art, as elaborated below.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: The compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminate material provided by the present invention includes: a flexible feeding circuit board, with wiring pins connected to both ends of the flexible feeding circuit board. The bottom surface of the flexible feeding circuit board is connected to a flexible magnetoelectric mechanical antenna board, the bottom surface of the flexible magnetoelectric mechanical antenna board is connected to a flexible covering layer, two support blocks are connected to the top surface of the flexible feeding circuit board, and two limiting blocks are connected to the bottom surface of the flexible covering layer; it also includes an upper protection plate and a lower protection plate, with two upper guide rails connected to the bottom surface of the upper protection plate and two lower guide rails connected to the top surface of the lower protection plate.

[0005] Preferably, a plurality of the set of limiting blocks are provided. A semi-circular block is provided at the left end of the limiting block, and a semi-circular groove is provided at the right end of the limiting block. The bottoms of the two sets of limiting blocks are respectively slidably connected to two lower guide rails. The semi-circular blocks and semi-circular grooves of adjacent two limiting blocks are in sliding contact. The tops of the two sets of supporting blocks are respectively slidably connected to two upper guide rails.

[0006] Preferably, the flexible magnetoelectric mechanical antenna board includes a flexible piezoelectric layer, a flexible adhesive layer and a flexible magnetostrictive layer stacked in sequence. The flexible piezoelectric layer includes a flexible piezoelectric fiber composite material, a flexible piezoelectric thin film material and a polyvinylidene fluoride polymer flexible polymer material. The flexible adhesive layer includes a flexible epoxy-based adhesive layer and a flexible polyurethane adhesive layer. The flexible magnetostrictive layer is composed of a combination of a nanocrystalline alloy strip, a nickel strip, a terbium-dysprosium-iron alloy soft material and a iron-gallium alloy soft material.

[0007] Preferably, a pin stabilizing component is provided between the upper protection plate and the lower protection plate. The pin stabilizing component includes two fixing frames. Both of the two fixing frames are installed between the upper protection plate and the lower protection plate. The two fixing frames are respectively located outside two cable pins. A lower clamping block and an upper clamping block are slidably connected to the inner wall of the fixing frame through brackets. A convex block is connected to the bottom surface of the flexible covering layer, and a elastic sheet is connected to the bottom surface of the convex block.

[0008] Preferably, the lower clamping block is located below the cable pin, the upper clamping block is located above the cable pin, and both ends of the elastic sheet are in contact with the bottom surface of the two lower clamping blocks respectively.

[0009] Preferably, two gears are rotatably installed on the inner wall of the fixing frame. Two racks are respectively connected to the upper clamping block and the lower clamping block. The two gears are respectively located in front of and behind the cable pin. The two racks on the upper clamping block are respectively meshed with the two gears, and the two racks on the lower clamping block are respectively meshed with the two gears. The two racks meshed with the gears are symmetrically arranged about the center.

[0010] Preferably, a supporting component is provided on the upper protection plate. The supporting component includes two sets of triangular blocks. A plurality of the triangular blocks are provided in one set. A plurality of through grooves are linearly arranged on the upper protection plate. The through grooves penetrate through the upper protection plate. A plurality of surface grooves are linearly arranged on the top surface of the upper protection plate. The plurality of surface grooves are respectively connected to the plurality of through grooves. A plurality of the triangular blocks are all installed on the bottom surface of the upper protection plate. The plurality of triangular blocks in the same set are respectively located below the plurality of through grooves. Two abutting blocks are rotatably connected to the inner wall of the triangular block. The two abutting blocks are mirror images of each other.

[0011] Preferably, a contact rod is slidably connected in the through groove. An arc surface is provided at the bottom of the contact rod. The arc surface at the bottom of the contact rod is located between the two contact blocks. The contact rod is in sliding contact with the two contact blocks. A return spring is arranged between the contact rod and the bottom surface of the upper guard plate.

[0012] Preferably, two central shafts are installed in the surface groove. Two rocker plates are rotatably connected to the outer walls of the central shafts. The two rocker plates are arranged in a mirror image. A leaf spring is connected between the rocker plate and the surface groove. The top of the contact rod is connected with two ejector rods. The two ejector rods are respectively in contact with the bottom surfaces of the two rocker plates.

[0013] The beneficial effects are as follows: 1. For the compact flexible low-frequency electromagnetic communication device based on high-conformal heterogeneous laminated materials, through the flexible settings of the flexible feeding circuit board, the flexible magnetoelectric mechanical antenna board and the flexible covering layer, the flexible feeding circuit board, the flexible magnetoelectric mechanical antenna board and the flexible covering layer can match the installation positions with various curvatures, and can still maintain stable performance in various complex mechanical environments. At the same time, it is also convenient to be installed in the devices worn close to the human body and various curved surface devices; through the settings of the upper guard plate and the lower guard plate, the upper guard plate and the lower guard plate can deform synchronously, and always maintain the protective effect on the flexible feeding circuit board, the flexible magnetoelectric mechanical antenna board and the flexible covering layer; through the settings of the two groups of limiting blocks, the two groups of limiting blocks can limit the bending radian of the flexible feeding circuit board, the flexible magnetoelectric mechanical antenna board and the flexible covering layer, and avoid damage caused by excessive bending radian in a local area when performing a large radian bending.

[0014] 2. For the compact flexible low-frequency electromagnetic communication device based on high-conformal heterogeneous laminated materials, through the setting of the pin stabilizing component, when the flexible feeding circuit board bends, the two upper clamping blocks and the two lower clamping blocks can automatically approach to clamp the two wiring pins at the interface position of the external device, keep the interface stable, and avoid the loosening and falling off of the connection between the external device and the two wiring pins caused by certain stress generated when the flexible feeding circuit board bends.

[0015] 3. For the compact flexible low-frequency electromagnetic communication device based on high-conformal heterogeneous laminated materials, through the setting of the support component, after the upper guard plate bends, the two groups of triangular blocks support the upper guard plate from the inside of the upper guard plate, thereby improving the stability of the upper guard plate; through the setting of multiple rocker plates, the multiple rocker plates can tilt up when the upper guard plate bends, thereby increasing the surface area of the top surface of the upper guard plate, and further accelerating the heat dissipation efficiency, and avoiding the situation that after the upper guard plate and the lower guard plate bend, the heat accumulated inside them cannot be discharged in time, thereby affecting the working performance of the flexible feeding circuit board and the flexible magnetoelectric mechanical antenna board.

[0016] 4. This compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials realizes the transmission and reception of very low frequency / ultra-low frequency radio electromagnetic waves based on the magnetoelectric coupling effect. An alternating electrical signal is input into the flexible magnetoelectric mechanical antenna board, which is converted into an alternating magnetization oscillation through the magnetoelectric coupling effect, resulting in magnetic dipole-induced electromagnetic waves. The flexible magnetoelectric mechanical antenna board induces changes in the magnetic field component of the electromagnetic wave, which is converted into an electrical signal through the magnetoelectric coupling effect. The converted signal is conditioned and amplified by the feeding circuit, and finally the electrical signal is output. The efficient magnetoelectric conversion characteristics ensure the sensitivity and stability of signal transmission and reception. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the appearance of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 is an exploded schematic diagram of the present invention; Figure 4 It is a schematic diagram of the support block structure of the present invention; Figure 5 It is a schematic diagram of the limit block structure of the present invention; Figure 6 is a schematic diagram of the pin stabilization assembly structure of the present invention; Figure 7 It is a schematic diagram of the fixed frame structure of the present invention; Figure 8 The present invention Figure 7 A magnified schematic diagram of point A; Figure 9 It is a schematic diagram of the structure of the shrapnel of the present invention; Figure 10 It is a schematic diagram of the upper guard plate structure of the present invention; Figure 11 It is a schematic diagram of the support assembly structure of the present invention; Figure 12 is a schematic diagram of the upper guard plate of the present invention in a bent state; Figure 13 It is a schematic diagram of the structure of the interference rod of the present invention; Figure 14 It is a schematic diagram of the seesaw structure of the present invention.

[0019] The description of the accompanying drawings is as follows: 1. Flexible feed circuit board; 11. Wiring pin; 2. Flexible magneto-electric mechanical antenna board; 3. Flexible covering layer; 4. Upper guard plate; 41. Upper guide rail; 42. Surface groove; 43. Through groove; 5. Lower guard plate; 51. Lower guide rail; 6. Pin stabilizing assembly; 61. Fixed frame; 62. Bump; 63. Spring piece; 64. Lower clamp block; 65. Upper clamp block; 66. Gear; 67. Rack; 7. Support block; 8. Limit block; 9. Support assembly; 91. Triangular block; 92. Resistance block; 93. Resistance rod; 94. Push rod; 95. Middle axis; 96. Rocker; 97. Leaf spring. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0021] Example 1 See also Figure 1 - Figure 14 A compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials comprises: a flexible feed circuit board 1, both ends of the flexible feed circuit board 1 are respectively connected with wiring pins 11, the bottom surface of the flexible feed circuit board 1 is connected with a flexible magnetoelectric mechanical antenna board 2, the flexible feed circuit board 1 and the flexible magnetoelectric mechanical antenna board 2 are electrically connected by welding or the like, the mechanical strength of the connection point is enhanced by glue sealing, the impedance of the flexible feed circuit board 1 is adjusted to match the impedance of the power supply end, the transmission efficiency of the electrical signal is improved and the power loss is minimized, the bottom surface of the flexible magnetoelectric mechanical antenna board 2 is connected with a flexible covering layer 3, the flexible covering layer 3 adopts a PI layer, and a 3m-sized conductive film is fixedly glued on its lower surface along the length direction of the covering layer. m*3mm*3mm micro NdFeB N35 permanent magnet DC magnetic bias 1*3 array or flexible additive manufacturing permanent magnet soft material, providing a DC bias magnetic field of 5Oe, the flexible covering layer completely covers the lower surface of the flexible magnetoelectric mechanical antenna board 2, and improves the durability of the flexible magnetoelectric mechanical antenna in extreme scenarios; the top surface of the flexible feed circuit board 1 is connected to two groups of support blocks 7, and the bottom surface of the flexible covering layer 3 is connected to two groups of limit blocks 8; the flexible magnetoelectric mechanical antenna board 2 includes a flexible piezoelectric layer, a flexible adhesive layer and a flexible magnetostrictive layer stacked in sequence, the flexible piezoelectric layer includes a flexible piezoelectric fiber composite material, a flexible piezoelectric film material and a polyvinylidene fluoride polymer flexible polymer material, and the driving material of the flexible piezoelectric layer is lead zirconate titanate-based ceramic (d 33A flexible piezoelectric fiber composite material with a piezoelectric constant of 650 pC / N is combined with a copper interdigital electrode (line width / spacing = 25 μm / 25 μm, thickness 5 μm) as an example flexible piezoelectric layer, with a thickness of 150 - 200 μm, ensuring a balance between mechanical strength and charge output; the flexible adhesive layer includes a flexible epoxy-based adhesive layer and a flexible polyurethane adhesive layer. The flexible epoxy-based adhesive layer is used as an example flexible adhesive layer, with a thickness of 10 - 20 μm and a shear strength of 15 MPa, which can achieve stress buffering and ultra-thinning requirements, and can ensure that the interlayer bonding strength is maintained after 10 4 After bending cycles. The flexible magnetostrictive layer is composed of a nanocrystalline alloy strip, a nickel strip, a Terfenol-D soft material, and an iron-gallium alloy soft material, which connects the flexible power supply circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible cover layer 3 into a whole, enabling a certain degree of bending and having a certain elasticity at the same time. Through the flexible design of the flexible power supply circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible cover layer 3, the flexible power supply circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible cover layer 3 can match the installation positions with various curvatures and still maintain stable performance in various complex mechanical environments. At the same time, it is also convenient to be installed in body-worn devices and various curved surface devices.

[0022] Furthermore, it also includes an upper guard plate 4 and a lower guard plate 5. Two upper guide rails 41 are connected to the bottom surface of the upper guard plate 4, and two lower guide rails 51 are connected to the top surface of the lower guard plate 5. A group of limit blocks 8 is set to be multiple. A semi-circular block is provided at the left end of the limit block 8, and a semi-circular groove is provided at the right end of the limit block 8. The bottom parts of the two groups of limit blocks 8 are respectively slidably connected to the two lower guide rails 51, and the semi-circular blocks and semi-circular grooves of adjacent two limit blocks 8 are in sliding contact. The top parts of the two groups of support blocks 7 are respectively slidably connected to the two upper guide rails 41. During bending, the gaps between the upper guard plate 4 and the flexible power supply circuit board 1, and between the lower guard plate 5 and the flexible cover layer 3 remain stable, so that the upper guard plate 4 and the lower guard plate 5 can always protect the flexible power supply circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible cover layer 3. It avoids the situation where when multiple layers are bent together, due to inconsistent deformation degrees of different structures, the multiple layers are squeezed against each other, resulting in damage to some structures. Through the setting of the upper guard plate 4 and the lower guard plate 5, the upper guard plate 4 and the lower guard plate 5 can deform synchronously and always maintain the protective effect on the flexible power supply circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible cover layer 3; through the setting of the two groups of limit blocks 8, the two groups of limit blocks 8 can limit the bending arc of the flexible power supply circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible cover layer 3, avoiding damage caused by excessive bending arc in a local area when performing a large arc bending.

[0023] In addition, a pin stabilizing component 6 is provided between the upper guard plate 4 and the lower guard plate 5. The pin stabilizing component 6 includes two fixing frames 61. Both of the two fixing frames 61 are installed between the upper guard plate 4 and the lower guard plate 5. The two fixing frames 61 are respectively located outside the two flexible cable pins 11. A lower clamping block 64 and an upper clamping block 65 are slidably connected to the inner wall of the fixing frame 61 through brackets. A convex block 62 is connected to the bottom surface of the flexible covering layer 3. A shrapnel 63 is connected to the bottom surface of the convex block 62. The lower clamping block 64 is located below the flexible cable pin 11, and the upper clamping block 65 is located above the flexible cable pin 11. Both ends of the shrapnel 63 are respectively in contact with the bottom surfaces of the two lower clamping blocks 64. When the two lower clamping blocks 64 move downward, the two lower clamping blocks 64 come into contact with both ends of the shrapnel 63 and press down both ends of the shrapnel 63. The shrapnel 63 exerts an upward reaction force on the two lower clamping blocks 64 through its own elastic force, causing the two lower clamping blocks 64 to approach the two flexible cable pins 11, and the two upper clamping blocks 65 also approach the two flexible cable pins 11 synchronously. Two gears 66 are rotatably installed on the inner wall of the fixing frame 61. Two racks 67 are respectively connected to the upper clamping block 65 and the lower clamping block 64. The two gears 66 are respectively located in front of and behind the flexible cable pin 11. The two racks 67 on the upper clamping block 65 are respectively meshed with the two gears 66, and the two racks 67 on the lower clamping block 64 are respectively meshed with the two gears 66. The two racks 67 meshed with the gears 66 are symmetrically arranged about the center. The lower clamping block 64 and the upper clamping block 65 can move synchronously and in opposite directions. Through the setting of the pin stabilizing component 6, when the flexible power supply circuit board 1 bends, the two upper clamping blocks 65 and the two lower clamping blocks 64 can automatically approach to clamp the connection positions of the two flexible cable pins 11 and the interfaces of external devices, keeping the interfaces stable and avoiding the loosening and falling off of the connections between the external devices and the two flexible cable pins 11 due to certain stress generated when the flexible power supply circuit board 1 bends.

[0024] It should be noted that a support component 9 is provided on the upper guard plate 4. The support component 9 includes two groups of triangular blocks 91. One group of triangular blocks 91 is provided with multiple ones. A plurality of through grooves 43 are linearly arranged on the upper guard plate 4. The through grooves 43 penetrate through the upper guard plate 4. A plurality of surface grooves 42 are linearly arranged on the top surface of the upper guard plate 4. The plurality of surface grooves 42 are respectively connected to the plurality of through grooves 43. The plurality of triangular blocks 91 are all installed on the bottom surface of the upper guard plate 4. The plurality of triangular blocks 91 in the same group are respectively located below the plurality of through grooves 43. Two abutting blocks 92 are rotatably connected to the inner wall of the triangular block 91. The two abutting blocks 92 are mirror-symmetrically arranged. When the upper guard plate 4 bends, the two groups of triangular blocks 91 form two groups of inner support skeletons, improving the stability of the upper guard plate 4 and further enhancing the protection effect. Through the setting of the support component 9, after the upper guard plate 4 bends, the two groups of triangular blocks 91 support the upper guard plate 4 from the inside of the upper guard plate 4, thereby improving the stability of the upper guard plate 4.

[0025] It is worth noting that a resistance rod 93 is slidably connected in the through groove 43, and the bottom of the resistance rod 93 is provided with an arc surface, and the arc surface at the bottom of the resistance rod 93 is located between the two resistance blocks 92, and the resistance rod 93 is in sliding contact with the two resistance blocks 92. When the two resistance blocks 92 are close to each other, the two resistance blocks 92 push the resistance rod 93 upward along the arc surface at the bottom of the resistance rod 93, and a return spring is arranged between the resistance rod 93 and the bottom surface of the upper guard plate 4, and two central shafts 95 are installed in the surface groove 42. The outer wall of the central shaft 95 is rotatably connected with two rocker plates 96, and the two rocker plates 96 are mirror-imaged. A leaf spring 97 is connected between the rocker plate 96 and the surface groove 42, and the top of the resistance rod 93 is connected with two push rods 94, and the two push rods 94 are in contact with the bottom surfaces of the two rocker plates 96 respectively. When the upper guard plate 4 is bent, the upper guard plate The multiple seesaws 96 on the top surface of 4 can be tilted upward, and the upper guard plate 4, the abutment rod 93 and the seesaw 96 are all set to materials with good thermal conductivity. After the multiple seesaws 96 are tilted, the heat dissipation area can be expanded and the heat dissipation effect can be accelerated, so that after the upper guard plate 4 is bent, the heat accumulated between the upper guard plate 4 and the lower guard plate 5 can be dissipated faster, and after the multiple seesaws 96 are tilted, an outer protective layer can be formed on the outside of the upper guard plate 4, further improving the protective effect; through the setting of the multiple seesaws 96, the multiple seesaws 96 can be tilted when the upper guard plate 4 is bent, thereby increasing the surface area of ​​the top surface of the upper guard plate 4, thereby accelerating the heat dissipation efficiency, and avoiding the upper guard plate 4 and the lower guard plate 5 After bending, the internal heat accumulated cannot be discharged in time, thereby affecting the working performance of the flexible feed circuit board 1 and the flexible magneto-electric mechanical antenna board 2.

[0026] Example 2 The following are the steps for manufacturing a flexible magneto-electric mechanical antenna board using a composite lamination process: Step 1: Cutting the flexible piezoelectric layer material and the flexible magnetostrictive layer material into a target shape by laser cutting; Step 2: Use sandpaper with appropriate mesh size to polish the bonding side surface of the flexible piezoelectric layer sheet and the flexible magnetostrictive layer sheet to enhance the bonding strength of the materials, and then ultrasonically clean them in anhydrous ethanol after polishing; Step 3: Use 3M DP460 flexible epoxy-based colloid to apply to the upper surface of the flexible piezoelectric layer sheet. Use the scraping method to apply the glue evenly and smooth during the operation time of the colloid and remove bubbles. Stack the flexible magnetostrictive layer sheet from bottom to top on the upper surface of the flexible piezoelectric fiber composite sheet. Repeat the glue coating and stacking operations twice to complete the "one piezoelectric layer + three magnetostrictive layers" structure assembly of the flexible magnetoelectric mechanical antenna from bottom to top, achieving the optimal balance between piezoelectric performance and flexibility. Step 4: Transfer the flexible magnetoelectric mechanical antenna with uncured colloid onto a flexible silicone plate, cover it with another silicone plate of the same size, use a hydraulic press to pre-press the two sides of the silicone plate at a pressure of 0.5 MPa to eliminate the interlayer gap, then increase the pressure to 1.2 MPa and hold the pressure for 4 hours, and cure it by changing the pressure holding temperature in a stepwise manner, so as to ensure the flatness of the flexible magnetoelectric mechanical antenna and the uniformity of the colloid while strengthening the interface bonding, enhancing the durability and reducing the residual stress; Step 5: After the colloid is cured, a flexible magnetoelectric mechanical antenna board is obtained. Weld the antenna port to a 50Pin cable with conductive silver paste to reduce the contact resistance and make it compatible with the flexible feeding circuit board 1.

[0027] With the above structure, the working principle of this case is that the flexible feeding circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible covering layer 3 are connected as a whole and can be bent to a certain extent. The upper guard plate 4 and the lower guard plate 5 can also be bent to a certain extent. When the flexible feeding circuit board 1 is bent, the two groups of support blocks 7 above the flexible feeding circuit board 1 drive the upper guard plate 4 to deform synchronously through the two upper guide rails 41. Since the two groups of support blocks 7 always support between the flexible feeding circuit board 1 and the upper guard plate 4, the distance between the flexible feeding circuit board 1 and the upper guard plate 4 remains the same as before after deformation. Similarly, when the flexible covering layer 3 deforms, it drives the lower guard plate 5 to deform synchronously through the cooperation between the two groups of limiting blocks 8 and the two lower guide rails 51, so that the upper guard plate 4, the flexible feeding circuit board 1, the flexible magnetoelectric mechanical antenna board 2, the flexible covering layer 3, and the lower guard plate 5 can be bent synchronously. During bending, the gaps between the upper guard plate 4 and the flexible feeding circuit board 1, and between the lower guard plate 5 and the flexible covering layer 3 remain stable, so that the upper guard plate 4 and the lower guard plate 5 can always protect the flexible feeding circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible covering layer 3, avoiding the situation where the multi-layer structure is squeezed due to inconsistent deformation degrees of different structures when bending together, resulting in damage to some structures. Taking a group of limiting blocks 8 as an example, a group of limiting blocks 8 are arranged side by side and the adjacent limiting blocks 8 are in head-to-tail contact. Taking two adjacent limiting blocks 8 as an example, the semi-circular block of the right limiting block 8 is in sliding contact with the semi-circular groove of the left limiting block 8. When both sides of the flexible covering layer 3 bend downward, the two limiting blocks 8 swing downward respectively with the middle contact point as the center of the circle. There is a certain gap below the contact position of the two limiting blocks 8. During the movement of the two limiting blocks 8, the right lower end of the left limiting block 8 continuously approaches the left lower end of the right limiting block 8. When the right lower end of the left limiting block 8 abuts against the left lower end of the right limiting block 8, the two limiting blocks 8 cannot swing downward anymore, and the limiting effect is achieved at this time. Therefore, the two groups of limiting blocks 8 can only be bent to a certain radian. When the flexible covering layer 3 is bent to the maximum radian, the two groups of limiting blocks 8 perform radian limiting to prevent local bending of the flexible covering layer 3 from exceeding the maximum radian and causing damage. Through the flexible setting of the flexible feeding circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible covering layer 3, the flexible feeding circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible covering layer 3 can match the installation positions with various curvatures and still maintain stable performance in various complex mechanical environments. At the same time, it is also convenient to be installed in devices worn close to the body and various curved surface devices. Through the setting of the upper guard plate 4 and the lower guard plate 5, the upper guard plate 4 and the lower guard plate 5 can deform synchronously and always maintain the protective effect on the flexible feeding circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible covering layer 3;Through the arrangement of two groups of limit blocks 8, the two groups of limit blocks 8 can limit the bending radian of the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible covering layer 3, avoiding damage caused by excessive bending radian in local areas when bending with a large radian.

[0028] When the two ends of the flexible covering layer 3 bend downward, the two fixing frames 61 move downward following the upper protection plate 4 and the lower protection plate 5. Since the bump 62 is connected to the middle position of the elastic piece 63 and the bump 62 has a certain thickness, there is a certain gap between the elastic piece 63 and the flexible covering layer 3. When the fixing frame 61 moves downward, it drives the upper clamping block 65 and the lower clamping block 64 inside it to move downward synchronously. Taking the upper clamping block 65 and the lower clamping block 64 in the same fixing frame 61 as an example, when the lower clamping block 64 moves upward, it can drive two gears 66 to rotate through two racks 67 above it. When the two gears 66 rotate, they can drive the upper clamping block 65 to move downward through two racks 67 on the upper clamping block 65. The lower clamping block 64 and the upper clamping block 65 can move synchronously in the opposite direction. Therefore, when the two lower clamping blocks 64 move downward, the two lower clamping blocks 64 contact the two ends of the elastic piece 63 and press down the two ends of the elastic piece 63. The elastic piece 63 exerts an upward reaction force on the two lower clamping blocks 64 through its own elastic force, causing the two lower clamping blocks 64 to approach the two wiring pins 11. The two upper clamping blocks 65 also approach the two wiring pins 11 synchronously. The two wiring pins 11 are at the interface position. After the two wiring pins 11 are connected to the external device interface, the two upper clamping blocks 65 and the two lower clamping blocks 64 can clamp the two interfaces. Through the arrangement of the pin stabilizing assembly 6, when the flexible feed circuit board 1 bends, the two upper clamping blocks 65 and the two lower clamping blocks 64 can automatically approach and clamp the interface positions of the two wiring pins 11 and the external device, maintaining the interface stability and avoiding the loosening and falling off of the connection between the external device and the two wiring pins 11 caused by certain stress generated when the flexible feed circuit board 1 bends.

[0029] When the upper protection plate 4 bends, the two groups of triangular blocks 91 bend synchronously. Taking one group of triangular blocks 91 as an example, one group of triangular blocks 91 are arranged side by side. When the upper protection plate 4 bends, the adjacent two triangular blocks 91 press against the abutting blocks 92 on the triangular blocks 91, causing the two abutting blocks 92 on the triangular blocks 91 to be squeezed from both sides and move towards each other. After the two abutting blocks 92 move in place and stop moving, at this time the upper protection plate 4 also reaches the maximum bending radian. At this time, the two groups of triangular blocks 91 form two groups of internal support skeletons. Refer to Figure 12, the stability of the upper guard plate 4 is improved, and the protection effect is further enhanced. While the two abutting blocks 92 approach each other, the two abutting blocks 92 push the abutting rod 93 upward along the arc surface at the bottom of the abutting rod 93. The spring on the abutting rod 93 always exerts a downward pressure on the abutting rod 93. Therefore, the abutting rod 93 exerts a reaction thrust on the two abutting blocks 92. Thus, when the upper guard plate 4 has not reached the maximum bending arc, there will also be a certain elastic force between the two abutting blocks 92 between adjacent triangular blocks 91, so that the two groups of triangular blocks 91 still have a certain supporting effect. The abutting rod 93 resets downward and at the same time pushes the two abutting blocks 92 to reset outward. When the abutting rod 93 moves upward, it drives the two ejector rods 94 to move upward, and the two ejector rods 94 drive the two rocker plates 96 to tilt upward. When the abutting rod 93 moves downward and resets, the two rocker plates 96 are reset respectively by the elastic force of the leaf springs 97. After the rocker plates 96 are reset, they are located in the surface grooves 42, making the top surface of the upper guard plate 4 relatively flat. Therefore, when the upper guard plate 4 bends, the multiple rocker plates 96 on the top surface of the upper guard plate 4 can tilt upward. The upper guard plate 4, the abutting rod 93 and the rocker plates 96 are all made of materials with good heat conduction performance. After the multiple rocker plates 96 tilt upward, the heat dissipation area can be enlarged, and the heat dissipation effect can be accelerated, so that after the upper guard plate 4 bends, the heat accumulated between the upper guard plate 4 and the lower guard plate 5 can be dissipated faster. And after the multiple rocker plates 96 tilt upward, an outer protective layer can be formed outside the upper guard plate 4, further enhancing the protection effect; through the setting of the support assembly 9, after the upper guard plate 4 bends, the two groups of triangular blocks 91 support the upper guard plate 4 from the inside of the upper guard plate 4, thereby improving the stability of the upper guard plate 4; through the setting of the multiple rocker plates 96, the multiple rocker plates 96 can tilt upward when the upper guard plate 4 bends, thereby increasing the surface area of the top surface of the upper guard plate 4, and further accelerating the heat dissipation efficiency, avoiding the heat accumulated inside the upper guard plate 4 and the lower guard plate 5 cannot be discharged in time after bending, thus affecting the working performance of the flexible feed circuit board 1 and the flexible magnetoelectric mechanical antenna board 2.

[0030] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims described.

Claims

1. A compact, flexible, low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials, characterized in that: include: A flexible feed circuit board (1), wherein two ends of the flexible feed circuit board (1) are respectively connected to wiring pins (11), the bottom surface of the flexible feed circuit board (1) is connected to a flexible magnetoelectric mechanical antenna board (2), the bottom surface of the flexible magnetoelectric mechanical antenna board (2) is connected to a flexible covering layer (3), the top surface of the flexible feed circuit board (1) is connected to two groups of support blocks (7), and the bottom surface of the flexible covering layer (3) is connected to two groups of limit blocks (8); It also comprises an upper guard plate (4) and a lower guard plate (5), wherein the bottom surface of the upper guard plate (4) is connected to two upper guide rails (41), and the top surface of the lower guard plate (5) is connected to two lower guide rails (51).

2. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 1, characterized in that: The set of limit blocks (8) is provided in plurality, a semicircular block is provided at the left end of the limit block (8), a semicircular groove is provided at the right end of the limit block (8), the bottoms of the two sets of limit blocks (8) are respectively slidably connected to the two lower guide rails (51), the semicircular blocks and the semicircular grooves of two adjacent limit blocks (8) are in slidable contact, and the tops of the two sets of support blocks (7) are respectively slidably connected to the two upper guide rails (41).

3. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 2, characterized in that: The flexible magnetoelectric mechanical antenna plate (2) comprises a flexible piezoelectric layer, a flexible adhesive layer and a flexible magnetostrictive layer which are stacked in sequence, the flexible piezoelectric layer comprising a flexible piezoelectric fiber composite material, a flexible piezoelectric film material and a polyvinylidene fluoride high molecular flexible polymer material, the flexible adhesive layer comprising a flexible epoxy-based adhesive layer and a flexible polyurethane adhesive layer, and the flexible magnetostrictive layer is composed of a combination of a nanocrystalline alloy strip, a nickel strip, a terbium-dysprosium-iron alloy soft material and an iron-gallium alloy soft material.

4. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 3, characterized in that: A pin stabilizing assembly (6) is provided between the upper guard plate (4) and the lower guard plate (5), and the pin stabilizing assembly (6) comprises two fixing frames (61), the two fixing frames (61) are both installed between the upper guard plate (4) and the lower guard plate (5), the two fixing frames (61) are respectively located outside the two flat cable pins (11), the inner wall of the fixing frame (61) is slidably connected to a lower clamping block (64) and an upper clamping block (65) through a bracket, the bottom surface of the flexible covering layer (3) is connected to a protrusion (62), and the bottom surface of the protrusion (62) is connected to a spring sheet (63).

5. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 4, characterized in that: The lower clamping block (64) is located below the cable pin (11), the upper clamping block (65) is located above the cable pin (11), and the two ends of the spring sheet (63) are in contact with the bottom surfaces of the two lower clamping blocks (64) respectively.

6. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 5, characterized in that: Two gears (66) are rotatably mounted on the inner wall of the fixed frame (61); two racks (67) are respectively connected to the upper clamping block (65) and the lower clamping block (64); the two gears (66) are respectively located in front of and behind the cable pin (11); the two racks (67) on the upper clamping block (65) are respectively meshed with the two gears (66); the two racks (67) on the lower clamping block (64) are respectively meshed with the two gears (66); and the two racks (67) meshed with the gears (66) are centrally symmetrically arranged.

7. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 6, characterized in that: The upper guard plate (4) is provided with a support assembly (9), the support assembly (9) comprising two groups of triangular blocks (91), one group of the triangular blocks (91) being provided in plurality, a plurality of through slots (43) being provided in a linear array on the upper guard plate (4), the through slots (43) penetrating the upper guard plate (4), a plurality of surface slots (42) being provided in a linear array on the top surface of the upper guard plate (4), the plurality of surface slots (42) being respectively connected to the plurality of through slots (43), the plurality of triangular blocks (91) being all mounted on the bottom surface of the upper guard plate (4), the plurality of triangular blocks (91) being in the same group being respectively located below the plurality of through slots (43), the inner wall of the triangular block (91) being rotatably connected to two abutment blocks (92), the two abutment blocks (92) being arranged in a mirror image.

8. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 7, characterized in that: A resistance rod (93) is slidably connected in the through groove (43), a bottom of the resistance rod (93) is provided with an arc surface, the arc surface at the bottom of the resistance rod (93) is located between two resistance blocks (92), the resistance rod (93) is in sliding contact with the two resistance blocks (92), and a return spring is provided between the resistance rod (93) and the bottom surface of the upper guard plate (4).

9. The compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials according to claim 8, characterized in that: Two central shafts (95) are installed in the surface groove (42), and the outer wall of the central shaft (95) is rotatably connected to two seesaw plates (96). The two seesaw plates (96) are arranged in a mirror image. A leaf spring (97) is connected between the seesaw plate (96) and the surface groove (42). The top of the abutment rod (93) is connected to two push rods (94), and the two push rods (94) are in contact with the bottom surfaces of the two seesaw plates (96) respectively.

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