Light-driven electromagnetic shielding device with adjustable frequency band

Abstract

The invention discloses a light-driven frequency band adjustable electromagnetic shielding device, which belongs to the technical field of electromagnetic wave antenna design and electromagnetic compatibility design, and comprises a photodiode, a photoresistor, a square graphite felt film, a polydifluorovinylene film, a nickel-cobalt alloy film, a grounding metal layer and a silicon substrate layer, the photodiode is arranged in a hole of the square graphite felt film and around the electromagnetic shielding device, one end of the photodiode is directly connected with one end of the photoresistor, and the other end of the photodiode is connected with the square graphite felt film; the other end of the photoresistor is connected with the grounding metal layer; a square graphite felt film is adhered to the polydifluorovinylene film, and a nickel-cobalt alloy film is adhered to the square graphite felt film; the polydifluorovinylene film is pasted on the grounding metal layer, and the grounding metal layer is pasted on the silicon substrate layer. Radio frequency driving is not needed, dynamic adjustment of the working frequency of the super-structure airspace electromagnetic suppression structure is achieved through the differential pressure of the photodiode and the photoresistor, and electromagnetic shielding is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic wave antenna design and electromagnetic compatibility design, and specifically relates to a light-driven frequency-band adjustable electromagnetic shielding device Background Art

[0002] With the development of society, the mutual interference between electromagnetic signals is becoming more and more serious, causing some sensitive equipment to not work properly or causing the performance of the equipment to decline. The design of electromagnetic interference is to suppress the external signal from interfering with the electromagnetic inside the equipment or between different modules in the equipment according to the working frequency of the equipment. With the continuous evolution of wireless communication technology, from 2G and 3G to 4G, 5G, Internet of Things and the unique application of related special frequency bands, the mutual interference is increasing, making electromagnetic compatibility design more and more important.

[0003] In terms of technology, traditional electromagnetic compatibility design methods mainly use metal shielding or electromagnetic shielding material coating, filtering, grounding, optimized wiring, anti-interference components such as magnetic beads, or grounding, isolation or absorbing materials to suppress or shield unwanted signals. However, once these methods are designed, their operating frequencies cannot be adjusted, or their working performance is not obvious in other frequency bands. At the same time, related power supply devices are also required.

[0004] In addition, electromagnetic shielding technology is also constantly updated with the continuous innovation of materials and processes. There are new metal-polymer composite materials: such as copper-polypropylene, aluminum-polyethylene, carbon-based-polymer composite materials: such as graphene-epoxy resin, carbon nanotube-polyurethane, and multilayer structural materials: broadband shielding is achieved through multilayer design. However, these materials are relatively complex and cannot be adjusted according to the needs of different frequencies. With the increasing advancement of micro-nano processing technology, electromagnetic shielding can be designed with different electromagnetic structures, and has a smaller size and a lighter structure, but the current electromagnetic structure needs to be designed according to a predetermined frequency. Once the design is completed, its frequency cannot be modified and adjusted, and it needs to be redesigned for other frequencies. Therefore, the design has a smaller electrical size, can be dynamically adjusted according to different electromagnetic frequencies, and does not require voltage consumption, which is a new path to solve the electromagnetic shielding problem. The present invention develops a light-driven frequency-adjustable electromagnetic shielding device, which can realize the frequency adjustment of the electromagnetic shielding device according to different light intensities, realize a frequency-adjustable electromagnetic shielding structure, and meet the electromagnetic shielding effect of different occasions. Summary of the invention

[0005] The present invention aims to solve the deficiencies of the prior art and provides the following solutions:

[0006] A light-driven frequency-band adjustable electromagnetic shielding device, comprising: a photodiode, a photoresistor, a square graphite felt film, a polyvinylidene fluoride film, a nickel-cobalt alloy film, a grounding metal layer and a silicon substrate layer;

[0007] The photodiode is arranged in the hole of the square graphite felt film and around the electromagnetic shielding device, one end of the photodiode is directly connected to one end of the photoresistor, and the other end is connected to the square graphite felt film;

[0008] The other end of the photoresistor is connected to the ground metal layer;

[0009] The square graphite felt film is adhered to the poly(vinylidene fluoride) film, and the nickel-cobalt alloy film is adhered to the square graphite felt film;

[0010] The polyvinylidene fluoride film is adhered to the grounding metal layer, and the grounding metal layer is adhered to the silicon substrate layer.

[0011] Preferably, 64 pieces of the poly(ethylene fluoride) films, 64 pieces of the square graphite felt films and 64 pieces of the nickel-cobalt alloy films are bonded together from bottom to top and electrically connected to the photoresistor and the ground metal layer to form a super-structured spatial electromagnetic shielding device.

[0012] Preferably, the photodiode is used to capture ambient light, convert light energy into electrical energy, and the photoresistor adjusts the magnitude of the generated current.

[0013] Preferably, the square graphite felt film drives the polyvinylidene fluoride film under the action of the current of the photodiode and the photoresistor, so that it works at a required frequency and radiates through the nickel-cobalt alloy film.

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

[0015] The present invention uses a photodiode and a photoresistor to change the pressure difference between the square graphite felt film and the grounded metal layer, forming a slight deformation on the surface of the polyvinylidene fluoride film, and the frequency of the deformation is controlled by the light intensity. At the same time, the working frequency of the electromagnetic shielding material is consistent with the frequency of the deformation, and together with the nickel-cobalt alloy film, a super-structured space electromagnetic suppression structure is formed to achieve electromagnetic shielding; the change of light intensity can change the efficiency of photoelectric conversion and form different currents. At the same time, its change will change the pressure difference at both ends of the photoresistor, and the pressure difference will control the working frequency of the polyvinylidene fluoride film, and the working frequency can be dynamically adjusted according to the light intensity.

[0016] The present invention does not require RF drive, but directly has photoelectric conversion, and realizes dynamic adjustment of the working frequency of the super-structured spatial electromagnetic suppression structure through the voltage difference between the photodiode and the photoresistor, so as to be suitable for different occasions, and can realize dynamic adjustment and continuous change of frequency suppression according to the light intensity, satisfying the electromagnetic interference suppression covering high frequency to low frequency, and realizing electromagnetic shielding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 labor.

[0018] Figure 1 A top view of a device according to an embodiment of the present invention;

[0019] Figure 2 A side view of a device according to an embodiment of the present invention;

[0020] Description of reference numerals:

[0021] 1. Photodiode; 2. Photoresistor; 3. Grounding metal layer; 4. Square graphite felt film; 5. Nickel-cobalt alloy film; 6. Polyvinylidene fluoride film; 7. Silicon substrate layer. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Embodiment 1

[0025] In this embodiment, if Figure 1 , Figure 2 As shown, a light-driven frequency-band adjustable electromagnetic shielding device includes: a photodiode 1, a photoresistor 2, a square graphite felt film 4, a poly(vinylidene fluoride) film 6, a nickel-cobalt alloy film 5, a grounding metal layer 3 and a silicon substrate layer 7.

[0026] The photodiode 1 is arranged in the hole of the square graphite felt film 4 and around the electromagnetic shielding device. One end of the photodiode 1 is directly connected to one end of the photoresistor 2, and the other end is connected to the square graphite felt film 4; the other end of the photoresistor 2 is connected to the grounding metal layer 3; the square graphite felt film 4 is adhered to the polyvinylidene fluoride film 6, and the nickel-cobalt alloy film 5 is adhered to the square graphite felt film 4; the polyvinylidene fluoride film 6 is adhered to the grounding metal layer 3, and the grounding metal layer 3 is adhered to the silicon substrate layer 7; the grounding metal layer 3 is realized by coating; the photodiode 1 and the photoresistor 2 penetrate the nickel-cobalt alloy film 5, the square graphite felt film 4, and the polyvinylidene fluoride film 6 to connect to the grounding metal layer 3, and the photodiode 1 is exposed to the air through the hole. The photodiode 1 is used to obtain ambient light, convert light energy into electrical energy, and the magnitude of the generated current is adjusted by the photoresistor 2. The square graphite felt film 4 drives the polyvinylidene fluoride film 6 under the action of the current of the photodiode 1 and the photoresistor 2, so that it works at a required frequency and radiates through the nickel-cobalt alloy film 5.

[0027] 64 pieces of poly(vinylidene fluoride) films 6, 64 pieces of square graphite felt films 4 and 64 pieces of nickel-cobalt alloy films 5 are bonded together from bottom to top and electrically connected to a photoresistor 2 and a ground metal layer 3 to form a super-structured spatial electromagnetic shielding device.

[0028] The square graphite felt film 4 is converted into a pressure difference together with the photoresistor 2 under the action of the photodiode 1, and the converted pressure difference is supplied to the polyvinylidene fluoride film 6 through the square graphite felt film 4. A slight deformation is formed on the surface of the polyvinylidene fluoride film 6, and the frequency of the deformation is controlled by the light intensity. At the same time, the operating frequency of the electromagnetic shielding material is consistent with the frequency of the deformation, and together with the nickel-cobalt alloy film 5, a super-structured airspace electromagnetic shielding device is formed to achieve electromagnetic shielding. Changes in light intensity can change the efficiency of photoelectric conversion and form different currents. At the same time, its changes will change the pressure difference at both ends of the photoresistor 2, and the pressure difference will control the operating frequency of the polyvinylidene fluoride film 6, and the operating frequency can be dynamically adjusted according to the light intensity.

[0029] Embodiment 2

[0030] In order to solve the problem of repeated design and band limitation of electromagnetic compatibility shielding materials with wide frequency bands, the present invention provides a light-driven band-adjustable electromagnetic shielding device, which aims to control the polyvinylidene fluoride film 6 under the condition of light intensity changes by the photodiode 1 and the photoresistor 2, realize the controllability of dynamic frequency and realize electromagnetic characteristics through the nickel-cobalt alloy film 5. This method can not only meet the dynamic adjustment of frequency, realize the adjustable electromagnetic shielding frequency, but also form a super-structured spatial electromagnetic suppression structure, thereby realizing electromagnetic shielding. It includes: a photodiode 1, a photoresistor 2, a square graphite felt film 4, a polyvinylidene fluoride film 6, a nickel-cobalt alloy film 5, a grounding metal layer 3 and a silicon substrate layer 7.

[0031] The photodiode 1 is located around the square graphite felt film 4, the polyvinylidene fluoride film 6, the nickel-cobalt alloy film 5 and the meta-structured spatial electromagnetic suppression structure, and the photoresistor 2 can be embedded in the polyvinylidene fluoride film 6 and the nickel-cobalt alloy film 5 and directly connected to the square graphite felt film 4 and the grounding metal layer 3 respectively.

[0032] The photodiodes 1 are distributed in the holes of the square graphite felt film 4 and around the entire device, and one end of each photodiode 1 is directly connected to the photoresistor 2, and then one end of the photoresistor 2 is connected to the square graphite felt film 4 and one end is connected to the ground metal layer 3. Under the change of light intensity, the voltage difference between the photodiode 1 and the photosensitive electronic end will change, forming a dynamically changing voltage difference.

[0033] The dynamically changing pressure difference applied to the upper and lower surfaces of the poly(vinylidene fluoride) film 6 causes the poly(vinylidene fluoride) film 6 to produce a slight deformation, and the frequency of the deformation is the operating frequency of the super-structured spatial electromagnetic suppression structure, and the frequency changes with the pressure difference, thereby achieving broadband dynamic adjustability.

[0034] The square graphite felt film 4 drives the polyvinylidene fluoride film 6 under the action of the current of the photodiode 1 and the photoresistor 2, so that it works at the required frequency and radiates through the nickel-cobalt alloy film 5. The working frequency can be controlled by the light intensity, and different frequencies can be changed to be practical for different application scenarios.

[0035] In this embodiment, 64 polyvinylidene fluoride films 6, 64 square graphite felt films 4 and 64 nickel-cobalt alloy films 5 are bonded together from bottom to top, and electrically connected to the photoresistor 2 and the ground metal layer 3 to form a super-structured space electromagnetic shielding device. Based on the above-mentioned electromagnetic structure shielding generation mechanism, the frequency can be dynamically controlled by controlling the light intensity to realize the super-structured space electromagnetic suppression structure of different frequency bands and realize electromagnetic shielding of different frequency bands.

[0036] In addition, the photoresistor 2 of this embodiment can form a super-structured spatial electromagnetic suppression structure under the same flat surface to achieve electromagnetic shielding in different frequency bands. However, when the resistance characteristics of the photoresistor 2 are inconsistent, each square graphite felt film 4, poly(ethylene fluoride) film 6 and nickel-cobalt alloy film 5 are bonded together from bottom to top to form different antenna units to achieve different frequency radiation, and can also realize continuous broadband antenna design.

[0037] This embodiment can not only realize a compact super-structured airspace electromagnetic suppression structure, a very small multi-frequency antenna and a broadband antenna, covering different frequencies and application scenarios, but also realize miniaturization and convenience design, which is very suitable for occasions with strict space requirements. This embodiment does not require energy and can work directly under the drive of light, providing a solution for electromagnetic interference design in multiple frequency bands. Due to the change of light intensity and the control of light intensity, the pressure difference of the driving polyvinylidene fluoride film 6 can be controlled, and the continuous regulation of the generated voltage control can be electromagnetically converted by the polyvinylidene fluoride film 6 and the nickel-cobalt alloy film 5, resulting in dynamic and continuous control of frequency electromagnetic interference suppression, which can realize broadband electromagnetic compatibility control; it is suitable for military and civilian equipment, even computer equipment, and can also be used in light-controlled indoors to realize frequency control of working smart homes, and can also be used in networked cars to realize electromagnetic control of electromagnetic packets. At the same time, with its wide band electromagnetic interference suppression characteristics, the system shows excellent application potential in modern military and communications, and can meet the demand for spectrum in new radio applications such as suborbital flight, hypersonic equipment, and smart homes. It can also be used as an antenna in multi-frequency and broadband communication environments, such as smart connected cars, smart homes, 5G / 6G mobile communications, portable communication terminals, etc.

[0038] In summary, compared with traditional electromagnetic shielding materials, this embodiment has adjustable functions and frequencies, and achieves ultra-wideband electromagnetic interference suppression without the need to replace electromagnetic equipment. It can also achieve the design of multi-band and wide-band antennas through the design of light intensity and photoresistor 2, and achieve continuous regulation of extremely wide frequencies to meet the wide coverage of different operating frequencies.

[0039] The embodiments described above are only descriptions of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A light-driven frequency-adjustable electromagnetic shielding device, characterized in that: include: Photodiode, photoresistor, square graphite felt film, polyvinylidene fluoride film, nickel-cobalt alloy film, ground metal layer and silicon substrate layer; The photodiode is arranged in the hole of the square graphite felt film and around the electromagnetic shielding device, one end of the photodiode is directly connected to one end of the photoresistor, and the other end is connected to the square graphite felt film; The other end of the photoresistor is connected to the ground metal layer; The square graphite felt film is adhered to the poly(vinylidene fluoride) film, and the nickel-cobalt alloy film is adhered to the square graphite felt film; The polyvinylidene fluoride film is adhered to the grounding metal layer, and the grounding metal layer is adhered to the silicon substrate layer.

2. The optically driven frequency-adjustable electromagnetic shielding device according to claim 1, characterized in that: 64 pieces of the poly(vinylidene fluoride) films, 64 pieces of the square graphite felt films and 64 pieces of the nickel-cobalt alloy films are bonded together from bottom to top and electrically connected to the photoresistor and the ground metal layer to form a super-structured airspace electromagnetic shielding device.

3. The optically driven frequency-adjustable electromagnetic shielding device according to claim 2, characterized in that: The photodiode is used to capture ambient light, convert light energy into electrical energy, and the photoresistor adjusts the magnitude of the generated current.

4. The optically driven frequency-adjustable electromagnetic shielding device according to claim 2, characterized in that: The square graphite felt film drives the polyvinylidene fluoride film under the action of the current of the photodiode and the photoresistor, so that it works at a required frequency and radiates through the nickel-cobalt alloy film.

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