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

Abstract

The present invention relates to the field of electromagnetic communication technology and discloses a compact, flexible, low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminate. The device comprises: a flexible feed circuit board, with wiring pins connected to each end of the flexible feed circuit board, a flexible magnetoelectric mechanical antenna board connected to the bottom surface of the flexible feed circuit board, and a flexible cover layer connected to the bottom surface of the flexible magnetoelectric mechanical antenna board; and an upper guard plate and a lower guard plate. The flexible arrangement of the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board, and the flexible cover layer allows the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board, and the flexible cover layer to accommodate installation locations with a variety of curvatures, maintaining stable performance in a variety of complex mechanical environments. The device is also convenient for installation in devices worn close to the human body and various curved devices.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic communication technology, and in particular to a compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials. Background Art

[0002] Very low frequency (VLF) / ultra-low frequency (ULF) electromagnetic waves, due to their long wavelength characteristics, exhibit excellent dielectric penetration capabilities, far exceeding those of general communication frequency band electromagnetic waves. This characteristic makes them have irreplaceable and significant application value in lossy dielectric penetration communication fields such as cross-domain positioning, emergency communication, underwater information transmission, and submarine communication. Traditional electric antennas rely on driving current or voltage in the conductor to generate electromagnetic resonance, resulting in the antenna size being comparable to the electromagnetic wavelength, making it difficult to fundamentally and significantly reduce the size, weight and power of very low frequency (ULF) / ultra-low frequency communication devices. Magnetoelectric mechanical antennas based on magnetoelectric composite materials use a unique transmission form of "electrical energy-mechanical energy-magnetic energy" to generate and receive electromagnetic waves through alternating magnetization oscillations. Since they operate in an electromechanical resonance state, their size is comparable to the mechanical wavelength. Compared with electric antennas of the same frequency, very low frequency / ultra-low frequency communication devices using magnetoelectric mechanical antenna technology can be reduced in size by 3-5 orders of magnitude.

[0003] However, the existing technology has the following problems:

[0004] Currently, magnetoelectric mechanical antennas generally adopt a rigid laminated structure as a solution for very low frequency / ultra-low frequency compact and highly penetrating wireless signal transmission devices. This rigid structure severely limits the adaptability of compact and highly penetrating wireless signal transmission devices in dynamic deformation interfaces. In scenarios where high portability and high conformality are required, its application and development are greatly restricted, and it is not easy to meet the requirements for flexibility and conformity of communication devices in complex and changing environments. For example, the rigid structure may not be convenient for installation in curved devices or wearable devices. Summary of the Invention

[0005] 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 in order to solve the above problems and overcome the defects of the prior art, as described in detail below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminate material, comprising: a flexible feed circuit board, wherein both ends of the flexible feed circuit board are respectively connected to wiring pins, the bottom surface of the flexible feed 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, the top surface of the flexible feed circuit board is connected to two groups of support blocks, and the bottom surface of the flexible covering layer is connected to two groups of limit blocks; and further comprising an upper guard plate and a lower guard plate, wherein the bottom surface of the upper guard plate is connected to two upper guide rails, and the top surface of the lower guard plate is connected to two lower guide rails.

[0008] Preferably, the group of limit blocks is provided in plurality, a semicircular block is provided at the left end of the limit block, a semicircular groove is provided at the right end of the limit block, the bottoms of the two groups of limit blocks are respectively slidably connected to the two lower guide rails, the semicircular blocks and semicircular grooves of two adjacent limit blocks are in sliding contact, and the tops of the two groups of support blocks are respectively slidably connected to the two upper guide rails.

[0009] Preferably, the flexible magnetoelectric mechanical antenna board comprises a flexible piezoelectric layer, a flexible adhesive layer and a flexible magnetostrictive layer stacked in sequence, the flexible piezoelectric layer comprises a flexible piezoelectric fiber composite material, a flexible piezoelectric film material and a polyvinylidene fluoride high molecular flexible polymer material, the flexible adhesive layer comprises a flexible epoxy-based adhesive layer and a flexible polyurethane adhesive layer, and the flexible magnetostrictive layer is composed of a combination of nanocrystalline alloy strips, nickel strips, terbium dysprosium iron alloy soft materials and iron gallium alloy soft materials.

[0010] Preferably, a pin stabilization assembly is provided between the upper guard plate and the lower guard plate, and the pin stabilization assembly includes two fixed frames, both of which are installed between the upper guard plate and the lower guard plate, and the two fixed frames are respectively located outside the two wiring pins, and the inner wall of the fixed frame is slidably connected to the lower clamping block and the upper clamping block through the bracket, the bottom surface of the flexible covering layer is connected to the protrusion, and the bottom surface of the protrusion is connected to the spring.

[0011] Preferably, the lower clamping block is located below the cable pins, the upper clamping block is located above the cable pins, and both ends of the spring are in contact with the bottom surfaces of the two lower clamping blocks respectively.

[0012] Preferably, two gears are rotatably installed on the inner wall of the fixed frame, and 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 pins. The two racks on the upper clamping block are respectively engaged with the two gears, and the two racks on the lower clamping block are respectively engaged with the two gears. The two racks engaged with the gears are arranged symmetrically with the center.

[0013] Preferably, the upper guard plate is provided with a support assembly, and the support assembly includes two groups of triangular blocks, and one group of triangular blocks is provided with multiple through slots. A linear array is provided on the upper guard plate, and the through slots pass through the upper guard plate. A linear array is provided on the top surface of the upper guard plate. The multiple surface slots are respectively connected to the multiple through slots. The multiple triangular blocks are all installed on the bottom surface of the upper guard plate, and the multiple triangular blocks in the same group are respectively located below the multiple through slots. The inner wall of the triangular block is rotatably connected to two interference blocks, and the two interference blocks are mirror-imaged.

[0014] Preferably, a resistance rod is slidably connected in the through groove, and the bottom of the resistance rod is provided with an arc surface. The arc surface of the bottom of the resistance rod is located between two resistance blocks. The resistance rod is in sliding contact with the two resistance blocks, and a reset spring is provided between the resistance rod and the bottom surface of the upper guard plate.

[0015] Preferably, two central axes are installed in the surface groove, and the outer wall of the central axis is rotatably connected to two seesaws, the two seesaws are mirror-imaged, a leaf spring is connected between the seesaw and the surface groove, and two top rods are connected to the top of the resistance rod, and the two top rods are respectively in contact with the bottom surfaces of the two seesaws.

[0016] The beneficial effects are:

[0017] 1. This compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials, through the flexible setting of the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board and the flexible cover layer, enables the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board and the flexible cover layer to match the installation positions of various curvatures, and can still maintain stable performance in a variety of complex mechanical environments. It is also convenient for installation in devices worn close to the human body and various curved devices; through the setting of the upper guard plate and the lower guard plate, the upper guard plate and the lower guard plate can be deformed synchronously, always maintaining the protective effect of the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board and the flexible cover layer; through the setting of the two sets of limit blocks, the two sets of limit blocks can limit the bending curvature of the flexible feed circuit board, the flexible magnetoelectric mechanical antenna board and the flexible cover layer, to avoid damage caused by excessive bending curvature in local areas when bending at a larger curvature.

[0018] 2. This compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials, through the setting of the pin stabilization component, enables the two upper clamping blocks and the two lower clamping blocks to automatically approach and clamp the interface position of the two cable pins and the external device when the flexible feed circuit board is bent, keeping the interface stable and avoiding the loosening and falling off of the connection between the external device and the two cable pins due to certain stress generated when the flexible feed circuit board is bent.

[0019] 3. This compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials, through the setting of a support component, enables the two groups of triangular blocks to support the upper guard plate from the inside of the upper guard plate after bending, thereby improving the stability of the upper guard plate; through the setting of multiple seesaws, the multiple seesaws can be tilted when the upper guard plate is bent, thereby increasing the surface area of the top surface of the upper guard plate, thereby accelerating the heat dissipation efficiency, and avoiding the heat accumulated inside the upper and lower guard plates after bending. It cannot be discharged in time, thereby affecting the working performance of the flexible feed circuit board and the flexible magnetoelectric mechanical antenna board.

[0020] 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 a magnetic dipole-induced electromagnetic wave. 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 an electrical signal is output. The efficient magnetoelectric conversion characteristics ensure the sensitivity and stability of signal transmission and reception. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0022] Figure 1 It is a schematic diagram of the appearance of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 3 It is an exploded schematic diagram of the present invention;

[0025] Figure 4 It is a schematic diagram of the support block structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the limit block structure of the present invention;

[0027] Figure 6 is a schematic structural diagram of a pin stabilization assembly of the present invention;

[0028] Figure 7 It is a schematic diagram of the fixed frame structure of the present invention;

[0029] Figure 8 This invention Figure 7 A magnified schematic diagram of point A;

[0030] Figure 9 It is a schematic diagram of the shrapnel structure of the present invention;

[0031] Figure 10 It is a schematic diagram of the upper guard plate structure of the present invention;

[0032] Figure 11 It is a schematic structural diagram of the support assembly of the present invention;

[0033] Figure 12 This is a schematic diagram of the upper guard plate of the present invention in a bent state;

[0034] Figure 13 2. It is a schematic diagram of the structure of the interference rod of the present invention;

[0035] Figure 14 It is a schematic diagram of the seesaw structure of the present invention.

[0036] The description of the accompanying drawings is as follows: 1. Flexible feed circuit board; 11. Wiring pin; 2. Flexible magnetoelectric 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 stabilization assembly; 61. Fixed frame; 62. Bump; 63. Spring; 64. Lower clamping block; 65. Upper clamping block; 66. Gear; 67. Rack; 7. Support block; 8. Limit block; 9. Support assembly; 91. Triangular block; 92. Interference block; 93. Interference rod; 94. Push rod; 95. Middle axis; 96. Rocker; 97. Leaf spring. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other implementations obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] See also Figure 1 - Figure 14A compact flexible low-frequency electromagnetic communication device based on highly conformal heterogeneous laminated materials includes: a flexible feed circuit board 1, both 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 flexible feed circuit board 1 and the flexible magnetoelectric mechanical antenna board 2 are electrically connected by welding or other methods, the mechanical strength of the connection point is enhanced by gluing, 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 to a flexible covering layer 3, the flexible covering layer 3 adopts a PI layer, and a 3m-sized material is fixed and 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 5Oe DC bias magnetic field, the flexible cover layer completely covers the lower surface of the flexible magnetoelectric mechanical antenna board 2, improving 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 cover 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 33 =650pC / N) of flexible piezoelectric fiber composite material with copper interdigital electrodes (line width / spacing = 25μm / 25μm, thickness 5μm) as an example of flexible piezoelectric layer, thickness 150-200μm, to ensure the balance between mechanical strength and charge output; flexible adhesive layer includes flexible epoxy-based adhesive layer and flexible polyurethane adhesive layer, flexible epoxy-based adhesive layer as an example of flexible adhesive layer, thickness 10-20μm, shear strength 15MPa, can achieve stress buffering and ultra-thin requirements, and can ensure 10 4 The interlayer bonding strength is maintained after the bending cycle; the flexible magnetostrictive layer is composed of a combination of nanocrystalline alloy strips, nickel strips, terbium dysprosium iron alloy soft materials, and iron gallium alloy soft materials, so that the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible covering layer 3 are connected into a whole, which can be bent to a certain extent and have a certain elasticity. Through the flexible setting of the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible covering layer 3, the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible covering layer 3 can match the installation positions of various curvatures, and can still maintain stable performance in a variety of complex mechanical environments. It is also convenient to be installed in devices worn close to the human body and various curved devices.

[0040] Furthermore, it also includes an upper guard plate 4 and a lower guard plate 5, 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, a set of limit blocks 8 is provided, the left end of the limit block 8 is provided with a semicircular block, and the right end of the limit block 8 is provided with a semicircular groove, the bottoms of the two groups of limit blocks 8 are respectively slidably connected to the two lower guide rails 51, and the semicircular blocks and semicircular grooves of the two adjacent limit blocks 8 are in sliding contact, and the tops of the two groups of support blocks 7 are respectively slidably connected to the two upper guide rails 41. When bending, the gaps between the upper guard plate 4 and the flexible feed 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 maintain contact with the flexible feed circuit board 1 and the flexible The protection of the magnetoelectric mechanical antenna board 2 and the flexible covering layer 3 prevents the multi-layer structure from being squeezed against each other due to the inconsistent deformation degrees of different structures when the multi-layer structure is bent together, thereby causing damage to part of the structure. 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 be deformed synchronously, and the protection effect of the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible covering layer 3 is always maintained; through the setting of the two sets of limit blocks 8, the two sets of limit blocks 8 can limit the bending curvature 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 curvature in local areas when bending at a larger curvature.

[0041] In addition, a pin stabilizing assembly 6 is provided between the upper guard plate 4 and the lower guard plate 5. The pin stabilizing assembly 6 includes two fixing frames 61. 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 on the outside of the two cable pins 11. The inner walls of the fixing frames 61 are slidably connected with 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 with a protrusion 62. The bottom surface of the protrusion 62 is connected with a spring piece 63. The lower clamping block 64 is located below the cable pin 11, and the upper clamping block 65 is located above the cable pin 11. The two ends of the spring piece 63 are in contact with the bottom surfaces of the two lower clamping blocks 64 respectively. When the two lower clamping blocks 64 move downward, the two lower clamping blocks 64 contact the two ends of the spring piece 63 and press the two ends of the spring piece 63 downward. The spring piece 63 applies an upward reverse thrust to the two lower clamping blocks 64 through its own elastic force, so that the two lower clamping blocks 64 are close to the two cable pins 11, and the two upper clamping blocks 65 The two racks 67 on the upper clamping block 65 are respectively engaged with the two gears 66, and the two racks 67 on the lower clamping block 64 are respectively engaged with the two gears 66. The two racks 67 engaged with the gears 66 are arranged symmetrically with the center, and the lower clamping block 64 and the upper clamping block 65 can move synchronously in opposite directions. Through the arrangement of the pin stabilizing component 6, the two upper clamping blocks 65 and the two lower clamping blocks 64 can automatically approach the interface position of the two cable pins 11 and the external device when the flexible feed circuit board 1 is bent, so as to keep the interface stable and avoid the loosening and falling off of the connection between the external device and the two cable pins 11 due to the certain stress generated when the flexible feed circuit board 1 is bent.

[0042] It is worth noting that a support assembly 9 is provided on the upper guard plate 4, which includes two groups of triangular blocks 91, and one group of triangular blocks 91 is provided in plurality. A plurality of through slots 43 are provided in a linear array on the upper guard plate 4, and the through slots 43 pass through the upper guard plate 4. A plurality of surface slots 42 are provided in a linear array on the top surface of the upper guard plate 4, and the plurality of surface slots 42 are respectively connected to the plurality of through slots 43. The plurality of triangular blocks 91 are all installed on the bottom surface of the upper guard plate 4, and the plurality of triangular blocks 91 of the same group are respectively located below the plurality of through slots 43. The inner wall of the triangular block 91 is rotatably connected to two interference blocks 92, and the two interference blocks 92 are mirror-imaged. When the upper guard plate 4 is bent, the two groups of triangular blocks 91 form two groups of internal support skeletons, which improves the stability of the upper guard plate 4 and further enhances the protective effect. Through the setting of the support assembly 9, after the upper guard plate 4 is bent, 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.

[0043] The top of the friction 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 rockers 96 respectively. When the upper guard plate 4 bends, the upper guard plate 4 4. The multiple seesaws 96 on the top surface can be tilted upward. The upper guard plate 4, the resistance 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. 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 to further improve the protective effect. Through the arrangement 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 heat accumulated inside cannot be discharged in time, thereby affecting the working performance of the flexible feed circuit board 1 and the flexible magnetoelectric mechanical antenna board 2.

[0044] Example 2

[0045] The following are the steps for manufacturing a flexible magneto-electric mechanical antenna board using a composite lamination process:

[0046] Step 1: Cut the flexible piezoelectric layer material and the flexible magnetostrictive layer material into target shapes by laser cutting;

[0047] Step 2: Use sandpaper of 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;

[0048] Step 3: Apply 3M DP460 flexible epoxy-based colloid to the upper surface of the flexible piezoelectric layer sheet. Use a doctor blade to evenly apply the glue and remove bubbles during the colloid's operating time. Then, stack the flexible magnetostrictive layer sheet on the upper surface of the flexible piezoelectric fiber composite sheet from bottom to top. Repeat the glue application and stacking operation twice to complete the bottom-up assembly of the flexible magnetoelectric mechanical antenna with a "one-piezoelectric layer + three-magnetostrictive layer" structure, achieving the optimal balance between piezoelectric performance and flexibility.

[0049] Step 4: Transfer the uncured colloid of the flexible magnetoelectric mechanical antenna to a flexible silicone plate, cover it with another silicone plate of the same size, and use a hydraulic press to press both sides of the silicone plate at a pressure of 0.5 MPa to pre-press and eliminate the gap between the layers. Then, increase the pressure to 1.2 MPa and hold the pressure for 4 hours. The holding temperature is changed to perform a step-curing process. This ensures the flatness of the flexible magnetoelectric mechanical antenna and the uniformity of the colloid while strengthening the interface bonding, enhancing durability, and reducing residual stress.

[0050] Step 5: After the colloid is solidified, a flexible magnetoelectric mechanical antenna board is obtained. The antenna port is soldered to the 50-pin cable with conductive silver glue to reduce the contact resistance and make it compatible with the flexible feed circuit board 1.

[0051] With the above structure, the working principle of this case is that the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible cover layer 3 are connected into a whole, which 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 feed circuit board 1 is bent, the two groups of support blocks 7 above the flexible feed 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 are always supported between the flexible feed circuit board 1 and the upper guard plate 4, the distance between the flexible feed circuit board 1 and the upper guard plate 4 remains the same after deformation. Similarly, when the flexible cover layer 3 is deformed, the two groups of limit blocks 8 and the two lower guide rails 51 cooperate to form a support structure. Drive the lower guard plate 5 to deform synchronously, so that the upper guard plate 4, the flexible feed 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. When bending, the gaps between the upper guard plate 4 and the flexible feed 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 maintain the protection of the flexible feed 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 against each other due to the inconsistent deformation degree of different structures when the multi-layer structure is bent together, thereby causing damage to part of the structure; taking a group of limit blocks 8 as an example, a group of limit blocks 8 are arranged side by side and adjacent limit blocks 8 are in end-to-end contact. Taking two adjacent limit blocks 8 as an example, the semicircular block of the right limit block 8 is in sliding contact with the semicircular groove of the left limit block 8. When the two sides of the flexible covering layer 3 are bent downward, the two limit blocks 8 swing downward with the middle contact point as the center of the circle. There is a certain gap below the contact position of the two limit blocks 8. During the movement of the two limit blocks 8, the lower right end of the left limit block 8 continuously approaches the lower left end of the right limit block 8. When the lower right end of the left limit block 8 abuts against the lower left end of the right limit block 8, the two limit blocks 8 can no longer swing downward. At this time, the limiting effect is achieved. Therefore, the two groups of limit blocks 8 can only bend to a certain curvature. When the flexible covering layer 3 is bent to the maximum curvature, the two groups of limit blocks 8 performs arc limiting to prevent local bending of the flexible cover layer 3 from exceeding the maximum arc and causing damage; through the flexible setting of the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible cover layer 3, the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible cover layer 3 can match the installation positions of various curvatures, and can still maintain stable performance in a variety of complex mechanical environments. It is also convenient to be installed in devices worn close to the human body and various curved 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 be deformed synchronously, always maintaining the protective effect of the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2 and the flexible cover layer 3;The two sets of limit blocks 8 are provided to limit the bending radius of the flexible feed circuit board 1, the flexible magnetoelectric mechanical antenna board 2, and the flexible cover layer 3, thereby preventing damage to local areas caused by excessive bending radius during large bending.

[0052] When the two ends of the flexible covering layer 3 bend downward, the two fixed frames 61 move downward with the upper guard plate 4 and the lower guard plate 5. Since the protrusion 62 is connected to the middle position of the spring piece 63 and the protrusion 62 has a certain thickness, there is a certain gap between the spring piece 63 and the flexible covering layer 3. When the fixed 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 fixed frame 61 as an example, when the lower clamping block 64 moves upward, it can drive the two gears 66 to rotate through the two racks 67 above it. When the two gears 66 rotate, they can drive the upper clamping block 65 to move downward through the two racks 67 on the upper clamping block 65. The lower clamping block 64 and the upper clamping block 65 can move synchronously in opposite directions. Therefore, when the two lower clamping blocks 64 move downward, the two lower clamping blocks 64 and the two ends of the spring piece 63 The two upper clamping blocks 65 also move synchronously to the two cable pins 11. The two cable pins 11 are located at the interface position. After the two cable pins 11 are connected to the interface of the external device, the two upper clamping blocks 65 and the two lower clamping blocks 64 can clamp the two interfaces. Through the setting of the pin stabilizing component 6, the two upper clamping blocks 65 and the two lower clamping blocks 64 can automatically approach the interface position of the two cable pins 11 and the external device when the flexible feed circuit board 1 is bent, so as to keep the interface stable and avoid the loosening and falling off of the connection between the external device and the two cable pins 11 due to a certain stress generated when the flexible feed circuit board 1 is bent.

[0053] When the upper guard plate 4 is bent, the two groups of triangular blocks 91 are bent synchronously. Taking one group of triangular blocks 91 as an example, one group of triangular blocks 91 is arranged side by side. When the upper guard plate 4 is bent, the two adjacent triangular blocks 91 squeeze the interference blocks 92 on the triangular blocks 91, so that the two interference blocks 92 on the triangular blocks 91 are squeezed on both sides and move toward each other. After the two interference blocks 92 move into place, they stop moving. At this time, the upper guard plate 4 also reaches the maximum bending curvature. At this time, the two groups of triangular blocks 91 form two groups of internal support skeletons. Figure 12, improves the stability of the upper guard plate 4, further improves the protection effect, when the two interference blocks 92 approach each other, the two interference blocks 92 push the interference rod 93 upward along the arc surface at the bottom of the interference rod 93, and the spring on the interference rod 93 always applies downward pressure to the interference rod 93. Therefore, the interference rod 93 applies a reverse thrust to the two interference blocks 92. Therefore, when the upper guard plate 4 does not have the maximum curvature of bending, there will be a certain elastic force between the two interference blocks 92 between the adjacent triangular blocks 91 , so that the two sets of triangular blocks 91 still have a certain supporting effect, the contact rod 93 resets downward, and at the same time pushes the two contact blocks 92 to reset outward. When the contact rod 93 moves upward, it drives the two push rods 94 to move upward, and the two push rods 94 drive the two rockers 96 to tilt upward. When the contact rod 93 moves downward and resets, the two rockers 96 are reset by the elastic force of the leaf spring 97 respectively. After the rocker 96 is reset, it is located in the surface groove 42, making the top surface of the upper guard plate 4 relatively flat. Therefore, when the upper guard plate 4 is bent, The multiple rocker plates 96 on the top surface of the upper guard plate 4 can be tilted upward. The upper guard plate 4, the contact rod 93 and the rocker plate 96 are all set to materials with good thermal conductivity. After the multiple rocker plates 96 are tilted, the heat dissipation area can be expanded and the heat dissipation effect can be accelerated. 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 rocker plates 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 support component 9, after the upper guard plate 4 is bent, 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 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 heat accumulated inside cannot be discharged in time, thereby affecting the working performance of the flexible feed circuit board 1 and the flexible magnetoelectric mechanical antenna board 2.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

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 both 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 includes 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); 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) includes two fixing frames (61), both of which are installed between the upper guard plate (4) and the lower guard plate (5), and the two fixing frames (61) are respectively located outside the two cable pins (11), and 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, and 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 (63); The lower clamping block (64) is located below the cable pin (11), and the upper clamping block (65) is located above the cable pin (11). The two ends of the spring (63) are in contact with the bottom surfaces of the two lower clamping blocks (64) respectively.

2. The compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminated material according to claim 1, characterized in that: A group of the 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 groups of the 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 sliding contact, and the tops of the two groups of the 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 a highly conformal heterogeneous laminated material 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 stacked in sequence, wherein the flexible piezoelectric layer comprises a flexible piezoelectric fiber composite material, a flexible piezoelectric film material and a polyvinylidene fluoride high molecular flexible polymer material, the flexible adhesive layer comprises 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 a highly conformal heterogeneous laminated material according to claim 3, characterized in that: Two gears (66) are rotatably mounted on the inner wall of the fixed frame (61), and two racks (67) are connected to the upper clamping block (65) and the lower clamping block (64), respectively. The two gears (66) are located in front of and behind the cable pin (11), respectively. The two racks (67) on the upper clamping block (65) are respectively engaged with the two gears (66), and the two racks (67) on the lower clamping block (64) are respectively engaged with the two gears (66). The two racks (67) engaged with the gears (66) are centrally symmetrically arranged.

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

6. The compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminated material according to claim 5, characterized in that: A resisting rod (93) is slidably connected in the through groove (43), and a curved surface is provided at the bottom of the resisting rod (93). The curved surface at the bottom of the resisting rod (93) is located between the two resisting blocks (92). The resisting rod (93) is in sliding contact with the two resisting blocks (92), and a return spring is provided between the resisting rod (93) and the bottom surface of the upper guard plate (4).

7. The compact flexible low-frequency electromagnetic communication device based on a highly conformal heterogeneous laminated material according to claim 6, 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 seesaws (96). The two seesaws (96) are arranged in a mirror image. A leaf spring (97) is connected between the seesaw (96) and the surface groove (42). The top of the resistance 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 seesaws (96) respectively.

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