Optically driven band tunable electromagnetic shielding device

Abstract

The application discloses a kind of light-driven frequency band adjustable electromagnetic shielding devices, belong to electromagnetic wave antenna design and electromagnetic compatibility design technical field, including: photodiode, photoresistor, square graphite felt film, polybisfluoroethylene film, nickel-cobalt alloy film, ground metal layer and silicon substrate layer;Photodiode is arranged in the hole of square graphite felt film and the periphery of electromagnetic shielding device, one end of photodiode is directly connected with one end of photoresistor, and the other end is connected with square graphite felt film;The other end of photoresistor is connected with ground metal layer;Polybisfluoroethylene film is pasted with square graphite felt film, square graphite felt film is pasted with nickel-cobalt alloy film;Polybisfluoroethylene film is pasted on ground metal layer, and ground metal layer is pasted on silicon substrate layer.The application does not need radio frequency drive, and the dynamic adjustment of super-structured space electromagnetic suppression structure operating frequency is realized by the pressure difference of photodiode and photoresistor, and electromagnetic shielding is completed.

Description

Technical Field

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

[0002] With the development of society, mutual interference between electromagnetic signals is becoming increasingly serious, causing some sensitive equipment to malfunction or degrade performance. Electromagnetic interference design aims to suppress external signals from interfering with the internal components of the device or between different modules within the device, based on the device's operating frequency. With the continuous evolution of wireless communication technology, from 2G and 3G to 4G, 5G, the Internet of Things, and the unique applications of related special frequency bands, mutual interference is increasing, making electromagnetic compatibility design increasingly important.

[0003] Technically, traditional EMC design methods primarily employ metal shielding or coating with electromagnetic shielding materials, filtering, grounding, optimized wiring, the use of anti-interference components such as ferrite beads, or grounding, isolation, or the use of absorbing materials to suppress or shield unwanted signals. However, once these methods are designed, their operating frequency cannot be adjusted, or their performance may be poor in other frequency bands. Furthermore, they require a power supply.

[0004] Furthermore, electromagnetic shielding technology is constantly evolving with the continuous advancement of materials and processes. New metal-polymer composites, such as copper-polypropylene and aluminum-polyethylene, carbon-based polymer composites, such as graphene-epoxy resin and carbon nanotube-polyurethane, and multilayer structural materials, are available, achieving broadband shielding through multi-layer designs. However, these materials are relatively complex and cannot be adjusted to meet the needs of different frequencies. Advances in micro-nanofabrication technology have enabled electromagnetic shielding to be designed using various electromagnetic structures, resulting in smaller dimensions and lighter structures. However, current electromagnetic structures must be designed based on a predetermined frequency. Once designed, their frequency cannot be modified or adjusted, requiring redesign for other frequencies. Therefore, a design with smaller electrical dimensions, dynamic adjustment to different electromagnetic frequencies, and no voltage consumption presents a new approach to solving the electromagnetic shielding problem. The present invention develops a light-driven, frequency-adjustable electromagnetic shielding device that can adjust its frequency based on varying light intensities, thus achieving a frequency-adjustable electromagnetic shielding structure that meets the electromagnetic shielding requirements of various scenarios. 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 polyvinylidene 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 ground metal layer, and the ground metal layer is adhered to the silicon substrate layer.

[0011] Preferably, 64 pieces of the polyvinylidene 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 operates 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 alter the voltage differential between a square graphite felt film and a grounded metal layer, causing slight surface deformation of the polyvinylidene fluoride film. The frequency of this deformation is controlled by light intensity. Simultaneously, the operating frequency of the electromagnetic shielding material matches the frequency of the deformation, and together with the nickel-cobalt alloy film, it forms a superstructured spatial electromagnetic suppression structure, achieving electromagnetic shielding. Variations in light intensity alter the efficiency of photoelectric conversion, generating varying currents. This variation in turn changes the voltage differential across the photoresistor, which in turn controls the operating frequency of the polyvinylidene fluoride film, allowing it to be dynamically adjusted based on 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. It can also realize dynamic adjustment and continuous change of frequency suppression according to the light intensity, meet the electromagnetic interference suppression covering high frequency to low frequency, and realize 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 any creative work.

[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. Ground 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 clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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] Example 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 polyvinylidene fluoride film 6, a nickel-cobalt alloy film 5, a grounding metal layer 3 and a silicon substrate layer 7.

[0026] A photodiode 1 is positioned within a hole in a square graphite felt film 4 and around the electromagnetic shielding device. One end of the photodiode 1 is directly connected to one end of a 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 a grounded metal layer 3. The square graphite felt film 4 is adhered to a polyvinylidene fluoride film 6, which in turn is adhered to a nickel-cobalt alloy film 5. The polyvinylidene fluoride film 6 is adhered to the grounded metal layer 3, which is adhered to the silicon substrate layer 7. The grounded metal layer 3 is formed by coating. The photodiode 1 and 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 grounded metal layer 3. The photodiode 1 is exposed to the air through the hole. The photodiode 1 is used to capture ambient light, converting the light energy into electrical energy. The photoresistor 2 then adjusts the generated current. 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 the polyvinylidene fluoride film 6 operates at a required frequency and radiates through the nickel-cobalt alloy film 5.

[0027] 64 pieces of polyvinylidene 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 the photoresistor 2 and the ground metal layer 3 to form a super-structured spatial electromagnetic shielding device.

[0028] Under the action of the photodiode 1, the square graphite felt film 4, together with the photoresistor 2, converts the converted pressure differential into a voltage difference. This voltage difference is then supplied to the polyvinylidene fluoride film 6 through the square graphite felt film 4. A slight deformation occurs on the surface of the polyvinylidene fluoride film 6, and the frequency of this deformation is controlled by the light intensity. Simultaneously, 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, it forms a super-structured spatial electromagnetic shielding device, achieving electromagnetic shielding. Changes in light intensity can alter the efficiency of photoelectric conversion, generating different currents. This change in turn changes the voltage differential across the photoresistor 2, which in turn controls the operating frequency of the polyvinylidene fluoride film 6, allowing the operating frequency to be dynamically adjusted according to the light intensity.

[0029] Example 2

[0030] To address the issues of repetitive design and frequency band limitations of electromagnetic compatibility shielding materials with wide frequency bands, the present invention provides a light-driven, band-tunable electromagnetic shielding device. This device utilizes a photodiode 1 and a photoresistor 2 to control a polyvinylidene fluoride film 6 under varying light intensity, achieving dynamic frequency control and electromagnetic characteristics through a nickel-cobalt alloy film 5. This method not only allows for dynamic frequency adjustment and adjustable electromagnetic shielding frequency, but also creates a superstructured spatial electromagnetic suppression structure, thereby achieving electromagnetic shielding. The device comprises 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] Photodiodes 1 are distributed within the holes of the square graphite felt film 4 and around the entire device. One end of each photodiode 1 is directly connected to a photoresistor 2. In turn, one end of the photoresistor 2 is connected to the square graphite felt film 4 and one end to the grounded metal layer 3. As light intensity changes, the voltage difference between the photodiode 1 and the photosensitive electronic end changes, 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. The frequency of the deformation is the operating frequency of the meta-space electromagnetic suppression structure, and the frequency changes with the change of the pressure difference, thereby achieving broadband dynamic adjustability.

[0034] The square graphite felt film 4, under the action of the current from the photodiode 1 and the photoresistor 2, drives the polyvinylidene fluoride film 6, causing it to operate at the desired frequency and radiate through the nickel-cobalt alloy film 5. The operating frequency can be controlled by the light intensity, and different frequencies can be changed to suit 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 a photoresistor 2 and a ground metal layer 3 to form a metastructured electromagnetic shielding device. Based on the aforementioned electromagnetic structural shielding mechanism, dynamic frequency control can be achieved by controlling light intensity, thereby realizing metastructured electromagnetic suppression structures in different frequency bands and achieving electromagnetic shielding in 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, polyvinylidene 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 not only enables compact, superstructured, spatial electromagnetic suppression structures, extremely small multi-frequency antennas, and broadband antennas covering diverse frequencies and application scenarios, but also achieves miniaturization and portability, making it ideal for applications with demanding space requirements. This embodiment requires no energy and can operate directly under light, providing a solution for electromagnetic interference design across multiple frequency bands. By varying and controlling the light intensity, the voltage differential across the polyvinylidene fluoride film 6 can be controlled, resulting in continuous regulation of voltage control. Electromagnetic conversion between the polyvinylidene fluoride film 6 and the nickel-cobalt alloy film 5 results in dynamic and continuous control of frequency electromagnetic interference suppression, enabling broadband electromagnetic compatibility control. This system is suitable for military and civilian equipment, even computer equipment, and can also be used in light-controlled indoor environments to achieve frequency control for smart homes and connected cars to achieve electromagnetic control of electromagnetic packets. Furthermore, with its wide-band electromagnetic interference suppression characteristics, this system demonstrates significant potential for application in modern military and communications, meeting spectrum demands in emerging radio applications such as suborbital flight, hypersonic devices, 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 wide coverage of different operating frequencies.

[0039] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A light-driven, band-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 polyvinylidene fluoride film, and the nickel-cobalt alloy film is adhered to the square graphite felt film; The polyvinylidene fluoride film is adhered to the ground metal layer, and the ground metal layer is adhered to the silicon substrate layer.

2. The optically driven, band-adjustable electromagnetic shielding device according to claim 1, characterized in that: 64 pieces of the polyvinylidene 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.

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

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