Wireless signal shielding instrument, laser induction method of graphene and laser induction equipment

Abstract

The invention discloses a wireless signal shielding instrument, a laser induction method of graphene and laser induction equipment. The wireless signal shielding instrument comprises a shielding plate and circular structure units distributed on the shielding plate according to a preset interval, the shielding plate is made of polyimide, and the circular structure units are graphene obtained by performing laser induction on a target position of the shielding plate. According to the invention, the technical problem that the normal communication of the mobile terminal without signal shielding is influenced because the related shielding instrument transmits the interference signal with strong power and the wireless signal of the mobile terminal without signal shielding is also influenced by the interference signal is solved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a wireless signal jammer, a graphene laser induction method and a laser induction device. Background Art

[0002] With the rapid development of wireless communication technology, wireless communication equipment plays various important roles in people's lives and production fields nowadays. Nowadays, as society enters the process of informatization at an increasingly faster speed, while enjoying the convenience, personalized multimedia comprehensive services, fast and accurate communication means created by today's science and technology, people also have to bear the security risks such as information leakage. In the current examination room, such as: college entrance examination, high school entrance examination and other large-scale examinations, most of the cheating tools use wireless communication devices such as mobile phones and wireless headphones or rely on the support of wireless signals; therefore, in the examination room where fairness is strictly required, if the examinees use the concealed convenience and convenience of wireless communication to perform improper operations, this cheating behavior seriously affects the principle of fair examination and disrupts the social order.

[0003] Wireless signal jammers are portable devices that can be used to shield mobile devices in order to protect the order, safety and confidentiality of places where communication equipment is prohibited, such as finance, important meetings, hospitals, examination halls, gas stations, etc. Existing signal shielding schemes mainly use signal jammers to transmit high-power white noise as interference signals to reduce the signal-to-noise ratio of the received signal of the wireless terminal, making it impossible to demodulate the wireless signal transmitted by the base station from the received signal, thereby achieving signal shielding of the wireless terminal in the shielding area.

[0004] However, this traditional shielding device also has its drawbacks. Since the existing shielding device transmits interference signals with high power, the wireless signals of mobile terminals outside the target area that do not need to be shielded are often affected by the interference signals. At the same time, the surrounding operator base stations will also be affected by high-power signals and the background noise will rise, making it impossible for the base station to normally demodulate the wireless signals transmitted by the mobile terminals that do not need to be shielded, affecting the normal communication of a large number of customers who do not need signal shielding. In addition, traditional shielding devices use metal shielding materials, conductive coatings and paints, magnetic materials, insulating materials, alloy shielding materials, etc. The above materials have the disadvantages of high manufacturing and processing costs, low durability, limited shielding performance, and sensitivity to temperature and humidity.

[0005] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0006] The present application provides a wireless signal jammer, a graphene laser induction method and a laser induction device, so as to at least solve the technical problem that, because the relevant jammer emits interference signals with strong power, the wireless signals of the mobile terminal that does not need to be shielded are also affected by the interference signals, causing an impact on the normal communication of the mobile terminal that does not need signal shielding.

[0007] According to one aspect of the present application, a wireless signal jammer is provided, comprising: a shielding plate, and circular structural units distributed on the shielding plate at preset intervals, wherein the material of the shielding plate is polyimide, and the circular structural units are graphene obtained by laser induction at a target position of the shielding plate.

[0008] Optionally, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1668 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0009] Optionally, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1795 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 0.5 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0010] Optionally, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1532 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 1.5 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0011] Optionally, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1841 MHz, the preset spacing is 3 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0012] Optionally, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1485 MHz, the preset spacing is 5 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0013] According to another aspect of the present application, a wireless signal jammer is provided, comprising: a shielding plate, and rectangular structural units distributed on the shielding plate, wherein the material of the shielding plate is polyimide, and the rectangular structural units are graphene obtained by laser induction at a target position of the shielding plate.

[0014] Optionally, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 869 MHz to 3600 MHz, the length and width of the rectangular structure unit are the same, both of which are 3 cm to 10 cm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the rectangular structure unit is 60.

[0015] According to another aspect of the present application, a laser induction method for graphene is also provided. The method is applied to a shielding plate whose material is polyimide, comprising: controlling a laser to process the shielding plate to obtain graphene, wherein the wavelength of the laser is 10.6 microns and the spot is 50 microns.

[0016] Optionally, a laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 3 watts, the scanning speed is 100 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 869 MHz.

[0017] Optionally, a laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 4.5 watts, the scanning speed is 150 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 1841 MHz.

[0018] Optionally, a laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 6 watts, the scanning speed is 200 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 2577 MHz.

[0019] Optionally, a laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 7.5 watts, the scanning speed is 250 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 3123 MHz.

[0020] Optionally, a laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 9 watts, the scanning speed is 300 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 3600 MHz.

[0021] According to another aspect of the present application, a laser induction device is also provided. The laser induction device is applied to the shielding plate whose material is polyimide, including: processing the shielding plate to obtain graphene, wherein the wavelength of the laser induction device is set to 10.6 microns and the light spot is set to 50 microns.

[0022] In the present application, a shielding plate and circular structural units distributed on the shielding plate at preset intervals are used, wherein the material of the shielding plate is polyimide, and the circular structural units are graphene obtained by laser induction of the target position of the shielding plate, thereby achieving the purpose of wireless signal shielding based on graphene, thereby achieving the technical effect of preventing the wireless signals of mobile terminals that do not require shielding from being affected, and further solving the technical problem that the wireless signals of mobile terminals that do not require shielding are also affected by the interference signals due to the related shielding instrument emitting interference signals with strong power, thereby affecting the normal communication of mobile terminals that do not require signal shielding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 is a schematic diagram of a wireless signal jammer according to an embodiment of the present application;

[0025] Figure 2 is a schematic diagram of another wireless signal jammer according to an embodiment of the present application;

[0026] Figure 3 It is a simulation schematic diagram of a shielding device for shielding electromagnetic wave signals with a frequency of 1668 MHz according to an embodiment of the present application;

[0027] Figure 4 It is a simulation schematic diagram of a shielding device for shielding electromagnetic wave signals with a frequency of 869 to 3600 MHz according to an embodiment of the present application;

[0028] Figure 5 It is a microscopic morphology of LIG under different laser parameters according to an embodiment of the present application;

[0029] Figure 6 This is a physical picture of a processing device for shielding electromagnetic wave signals with a frequency of 1668 MHz according to an embodiment of the present application;

[0030] Figure 7 is a LIG microstructure diagram and Raman spectrum according to an embodiment of the present application;

[0031] Figure 8 is a schematic diagram of the transmittance change of a shielding device under different bending conditions according to an embodiment of the present application;

[0032] Fig. 9 This is a simulation experiment diagram of a signal jammer of a specific frequency band according to an embodiment of the present application;

[0033] Fig.10 This is a simulation experiment diagram of a full-band signal jammer according to an embodiment of the present application;

[0034] Fig.11 This is a diagram of actual measurement results of a full-band wireless signal jammer according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] According to an embodiment of the present application, a method embodiment of a wireless signal jammer is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0038] Figure 1is a schematic diagram of a wireless signal jammer according to an embodiment of the present application, such as Figure 1 As shown, the wireless signal jammer includes: a shielding plate, and circular structural units distributed on the shielding plate at a preset interval, wherein the shielding plate is made of polyimide, and the circular structural units are graphene obtained by laser induction at a target position of the shielding plate.

[0039] Among them, polyimide (PI) refers to a type of polymer containing an imide ring (-CO-NR-CO-) on the main chain, and is an organic polymer material with the best comprehensive performance. It is resistant to high temperatures of more than 400°C, some of which have no obvious melting point and have high insulation properties. As a special engineering material, it has been widely used in aviation, aerospace, microelectronics, nano, liquid crystal, separation membrane, laser and other fields.

[0040] The circular structural unit is laser-induced graphene (LIG). Laser-induced graphene refers to the process of using an infrared laser to act on a polyimide film. When the laser is irradiated at a certain laser power, the polyimide film is transformed into graphene through photochemical and thermochemical processes, while the rest of the film is emitted as gas. The product of this preparation method is called laser-induced graphene.

[0041] In the above-mentioned shielding device, by adjusting the parameters of the graphene structural unit, it is possible to effectively shield wireless signals of different frequency bands and meet the shielding requirements of multi-standard communication systems. The active absorption method does not need to transmit high-power interference signals, reduces radiation, protects personnel health, and also avoids the impact on communication equipment outside the shielding area. The polyimide film gives the wireless signal shielding device good flexibility, allowing it to be flexibly deployed under various terrain conditions, solving the blind spots and dead angles of traditional shielding equipment in complex environments.

[0042] Figure 2 is a schematic diagram of another wireless signal jammer according to an embodiment of the present application, such as Figure 2 As shown in the figure, this shielding device is different from traditional products that transmit strong power signals to achieve shielding effects. It uses active absorption to absorb electromagnetic waves carrying wireless signals, forming an invisible protective net in places that need to be shielded. This shielding device can not only shield signals in the current mainstream communication frequency band (869~3600MHz), but also shield signals in specific frequency bands according to specific scenarios. The shielding band can be effectively adjusted by adjusting the period and radius of the structure. In addition, this shielding device is a flexible thin film device that is different from traditional rigid shielding devices. It can perfectly solve the large number of shielding blind spots and dead angles that exist due to the diversity of terrain in the shielding area, and will not affect the normal communication of people outside the shielding area.

[0043] Preferably, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1668 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0044] It should be noted that, for the circles where the circular structural units are separated, the preset spacing refers to the shortest distance from an edge point of one circular structural unit to an edge point of another adjacent circular structural unit.

[0045] Figure 3 is a simulation schematic diagram of shielding an electromagnetic wave signal with a frequency of 1668 MHz according to an embodiment of the present application. Figure 3 It can be clearly seen that the absorption rate at 1668MHz can reach more than 95%, and it basically does not absorb electromagnetic wave signals of other frequencies, which can effectively avoid the impact on other signal sources; it only has a good absorption effect on electromagnetic wave signals of 1668MHz, thereby achieving the purpose of shielding and blocking the 1668MHz signal.

[0046] Preferably, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1795 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 0.5 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0047] Preferably, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1532 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 1.5 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0048] Preferably, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1841 MHz, the preset spacing is 3 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 μm to 400 μm; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0049] Preferably, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1485 MHz, the preset spacing is 5 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

[0050] The embodiment of the present application also provides a wireless signal jammer, comprising: a shielding plate, and rectangular structural units distributed on the shielding plate, wherein the material of the shielding plate is polyimide, and the rectangular structural units are graphene obtained by laser induction at a target position of the shielding plate.

[0051] It should be noted that the size of the rectangular structural unit can be smaller than the shielding plate. The size of the rectangular structural unit can also be the same as the shielding plate. For example, by laser induction at all positions of a shielding plate with a length and width of 5 cm, graphene with a length and width of 5 cm can be obtained.

[0052] Optionally, when the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 869 MHz to 3600 MHz, the length and width of the rectangular structure unit are the same, both of which are 3 cm to 10 cm, and the thickness of the shielding plate is 30 microns to 400 microns; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the rectangular structure unit is 60.

[0053] Figure 4 is a simulation schematic diagram of shielding an electromagnetic wave signal with a frequency of 869 to 3600 MHz according to an embodiment of the present application, such as Figure 4 As shown, the absorption rate in the mainstream communication frequency band of 869-3600 MHz can reach more than 90%, indicating that the prepared samples have a strong absorption effect on the electromagnetic wave signals in this frequency band, thereby achieving the effect of signal shielding and blocking, and completing the purpose of full signal shielding in the mainstream communication frequency band.

[0054] An embodiment of the present application also provides a laser induction method for graphene, which is applied to the shielding plate whose material is polyimide, and includes: controlling a laser to process the shielding plate to obtain graphene, wherein the wavelength of the laser is 10.6 microns and the spot is 50 microns.

[0055] Preferably, the laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 3 watts, the scanning speed is 100 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 869 MHz.

[0056] Preferably, the laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 4.5 watts, the scanning speed is 150 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 1841 MHz.

[0057] Preferably, the laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 6 watts, the scanning speed is 200 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 2577 MHz.

[0058] Preferably, the laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 7.5 watts, the scanning speed is 250 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 3123 MHz.

[0059] Preferably, the laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 9 watts, the scanning speed is 300 mm per second, and the graphene is used to shield electromagnetic wave signals with a frequency of 3600 MHz.

[0060] It should be noted that the above laser is, for example, a CO2 laser, and the maximum output power of the laser is 30 watts.

[0061] Figure 5 The microscopic morphology of LIG under different laser parameters according to an embodiment of the present application is as follows Figure 5 As shown in the figure, the effects of laser processing parameters on high-quality LIG are studied from two aspects: laser power and scanning speed. (a) shows the effect of changing the laser power (laser power from 0W to 9W, interval 1.5W) on the generation of LIG while keeping the laser scanning speed (200mm / s) unchanged. As the laser power increases, the energy acting on the PI film gradually increases, PI is carbonized to generate graphene, the surface holes of the generated LIG increase, and the conductivity becomes stronger. (b) shows the effect of adjusting the laser scanning speed (0-300mm / s, interval 50mm / s) on LIG while keeping the laser power at 6W unchanged. The slower the scanning speed, the higher the quality of the generated graphene, the more surface holes of the generated LIG, and the stronger the conductivity.

[0062] Figure 6 This is a physical picture of the processing of a shielding device for shielding electromagnetic wave signals with a frequency of 1668 MHz according to an embodiment of the present application. For the shielding device, the processing parameters of the laser are: laser power 7.5W, scanning speed 200mm / s, and spot size 50μm.

[0063] Figure 7The structure of graphene materials generated under an electron microscope and its Raman spectrum at room temperature are displayed. The generated graphene material presents a porous structure. LIG has three typical characteristic peaks of graphene: D, G and 2D peaks. The D peak (~1350cm-1) represents the defect peak, reflecting structural defects or edges, the G peak (~1580cm-1) reflects its symmetry and degree of crystallinity, and the 2D peak (~2700cm-1) D represents the vibration mode of two photonic lattices, which is the frequency doubling peak of the D peak.

[0064] This application also tests the bendability of the wireless signal jammer. Figure 8 is a schematic diagram of the transmittance change of the shielding device under different bending conditions according to an embodiment of the present application, such as Figure 8 As shown, angle θ is selected as the standard for measuring the bending degree of the shielding device, that is, the bending degree is positively correlated with angle θ; when D is 11 mm and H is 7.8 mm, tanθ=0.709 is obtained according to the trigonometric function relationship, and then θ=35° is calculated according to the inverse trigonometric function formula.

[0065] Depend on Figure 8 (b) It can be seen that under different bending conditions, the shielding instrument does not show obvious peak shift phenomenon, and the peak value does not change significantly. Under different bending conditions, it is normal for the filter peaks and peak values ​​of several sets of data to change slightly. This may be caused by experimental errors and can be ignored.

[0066] Therefore, the shielding effect of the shielding device prepared in the present application will not change much at different bending angles, and it has excellent stability; the flexible signal shielding device can perfectly solve the large number of shielding blind spots and dead angles existing due to the diverse terrain of the shielding area.

[0067] Fig. 9 is a simulation experiment diagram of a signal jammer in a specific frequency band according to an embodiment of the present application, such as Fig. 9 As shown, Fig. 9 The solid line in the middle is a wireless signal jammer designed and implemented for the 1364MHz frequency band. Fig. 9 It can be clearly seen that the absorption rate at 1364MHz can reach more than 95%, and it basically does not absorb electromagnetic wave signals of other frequencies, which can effectively avoid the influence of other signal sources. It only has a good absorption effect on electromagnetic wave signals of 1364MHz frequency, thereby achieving signal shielding and blocking for 1364MHz. Similarly, changing the structural parameters of the signal jammer can achieve the effect of signal shielding and blocking for other specific frequencies, such as Fig. 9 The middle dotted line shows the design for specific frequencies such as 1668MHz, 1998MHz, and 2751MHz by changing the radius and period of the disk structure.

[0068] Fig.10 : is a simulation experiment diagram of a full-band signal jammer according to an embodiment of the present application, such as Fig.10 The figure shows the results of the simulated absorption experiment. The absorption rate in the mainstream communication frequency band of 869-3600 MHz can reach more than 90%, indicating that the prepared samples have a strong absorption effect on the electromagnetic wave signals in this frequency band, thereby achieving the effect of signal shielding and blocking, and completing the purpose of full-band signal shielding.

[0069] Fig.11 This is a diagram of the actual measurement results of a full-band wireless signal jammer according to an embodiment of the present application. Fig.11 This is the actual measurement result in the classroom. According to the test instrument, the signal in this area is basically 0, which shows that the graphene signal shielding device of the present application can effectively absorb external signals and form a protective net.

[0070] In summary, this application has the following beneficial effects:

[0071] 1. The periodic disk structure designed for specific frequency band signals can effectively shield wireless signals of specific frequency bands according to actual scene requirements, effectively solving the problem that existing shielding devices on the market can only fully shield wireless signals but cannot identify and shield signals. Shielding of signals of different frequency bands can be achieved by changing the radius and periodic parameters of the disk. In addition, the shielding device involved in this application can also achieve a shielding effect of more than 95% for the current mainstream communication frequency band (869~3600MHz) signals.

[0072] 2. The new graphene wireless signal jammer proposed in this application is a flexible thin film device. During the actual measurement, the performance of the signal jammer of this structure did not change significantly under different bending angles, and it has excellent stability. Such performance can effectively solve the large number of shielding blind spots and dead angles in the shielding area due to the diversity of terrain, and can effectively supplement the shielding effect of traditional jammers.

[0073] 3. The new graphene wireless signal jammer proposed in this application uses an active absorption method to absorb the electromagnetic waves carrying wireless signals, thereby achieving the effect of shielding and blocking, which is fundamentally different from the traditional signal jammer that emits a strong power suppression signal for passive shielding. The new graphene wireless signal jammer proposed in this application will not affect the terminal wireless signals outside the shielding target area during use, and because it uses active absorption to shield, there is no need to emit high-power radiation waves, so it will not affect the health of people in the shielding area. It effectively solves the problems of existing jammers interfering with the external network and serious radiation.

[0074] In summary, the advantages of the wireless signal jammer based on laser-induced graphene proposed in this application are as follows: 1. Multi-band and multi-standard support: it can adapt to the shielding requirements of various communication systems; 2. Simple preparation and convenient deployment: the equipment is a flexible thin film device, which is easy to process, low cost, small in size, can be quickly and conveniently installed, and will not affect the communication capabilities outside the shielding area; 3. Selective shielding: it has the ability to discriminate signals and can be designed and prepared for specific frequency bands. Therefore, this new type of graphene wireless signal jammer has certain potential in the development and application of wireless signal shielding systems in the future.

[0075] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0076] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0077] In the above-mentioned embodiments of the present application, the collected information is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with relevant laws, regulations and standards, take necessary protection measures, do not violate public order and good morals, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0078] In the several embodiments provided in this application, it should be understood that the disclosed technical contents can be implemented in other ways.

[0079] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A wireless signal jammer, characterized in that: include: A shielding plate, and circular structural units distributed on the shielding plate at a preset interval, wherein the shielding plate is made of polyimide, and the circular structural units are graphene obtained by laser induction at a target position of the shielding plate.

2. The wireless signal jammer according to claim 1, characterized in that: When the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1668 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 μm to 400 μm; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

3. The wireless signal jammer according to claim 1, characterized in that: When the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1795 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 0.5 mm, and the thickness of the shielding plate is 30 μm to 400 μm; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

4. The wireless signal jammer according to claim 1, characterized in that: When the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1532 MHz, the preset spacing is 4 mm, the radius of the circular structure unit is 1.5 mm, and the thickness of the shielding plate is 30 μm to 400 μm; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

5. The wireless signal jammer according to claim 1, characterized in that: When the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1841 MHz, the preset spacing is 3 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 μm to 400 μm; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

6. The wireless signal jammer according to claim 1, characterized in that: When the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 1485 MHz, the preset spacing is 5 mm, the radius of the circular structure unit is 1 mm, and the thickness of the shielding plate is 30 μm to 400 μm; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; the loss tangent value of the circular structure unit is 60.

7. A wireless signal jammer, characterized in that: include: A shielding plate, and rectangular structural units distributed on the shielding plate, wherein the material of the shielding plate is polyimide, and the rectangular structural units are graphene obtained by laser induction at target positions of the shielding plate.

8. The wireless signal jammer according to claim 7, characterized in that: When the wireless signal jammer is used to shield electromagnetic wave signals with a frequency of 869 MHz to 3600 MHz, the length and width of the rectangular structural unit are the same, both of which are 3 cm to 10 cm, and the thickness of the shielding plate is 30 μm to 400 μm; the refractive index of the shielding plate is 1.8+0.03i, the dielectric constant is 3.23, and the loss tangent value is 0.0334; The loss tangent value of the rectangular structural unit is 60.

9. A method for laser induction of graphene, the method being applied to the shielding plate made of polyimide in claim 1 or 8, characterized in that: include: The shielding plate is processed by controlling a laser to obtain graphene, wherein the wavelength of the laser is 10.6 microns and the spot size is 50 microns.

10. The laser induction method of graphene according to claim 9, characterized in that: include: The laser is controlled to process the shielding plate to obtain graphene, wherein the power of the laser is 3 watts and the scanning speed is 100 mm per second. The graphene is used to shield electromagnetic wave signals with a frequency of 869 MHz.

11. The laser induction method of graphene according to claim 9, characterized in that: include: The shielding plate is processed by controlling a laser to obtain graphene, wherein the power of the laser is 4.5 watts and the scanning speed is 150 mm per second. The graphene is used to shield electromagnetic wave signals with a frequency of 1841 MHz.

12. The laser induction method of graphene according to claim 9, characterized in that: include: The shielding plate is processed by controlling a laser to obtain graphene, wherein the power of the laser is 6 watts and the scanning speed is 200 mm per second. The graphene is used to shield electromagnetic wave signals with a frequency of 2577 MHz.

13. The laser induction method of graphene according to claim 9, characterized in that: include: The shielding plate is processed by controlling a laser to obtain graphene, wherein the power of the laser is 7.5 watts and the scanning speed is 250 mm per second. The graphene is used to shield electromagnetic wave signals with a frequency of 3123 MHz.

14. The laser induction method of graphene according to claim 9, characterized in that: include: The shielding plate is processed by controlling a laser to obtain graphene, wherein the power of the laser is 9 watts and the scanning speed is 300 mm per second. The graphene is used to shield electromagnetic wave signals with a frequency of 3600 MHz.

15. A laser induction device, which is applied to the shielding plate made of polyimide in claim 1 or 8, characterized in that: include: The shielding plate is processed to obtain graphene, wherein the wavelength of the laser induction device is set to 10.6 microns and the light spot is set to 50 microns.

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