Electromagnetic protection device based on mechanical wave nonlinear attenuation

Abstract

The invention belongs to the technical field of electromagnetic protection, and relates to an electromagnetic protection device based on mechanical wave nonlinear attenuation, which comprises a piezoelectric substrate, and a signal input component, a nonlinear attenuation component and a signal output component which are sequentially arranged on the piezoelectric substrate at intervals, the nonlinear attenuation component comprises an energy absorption structure, a deformation structure and a rigid connection structure. The energy absorption structures are made of energy absorption materials and are arranged above the piezoelectric substrate at intervals; the deformation structure is made of a mechanical metamaterial, and two ends of the deformation structure are respectively connected with the energy absorption structure and the piezoelectric substrate; one end of the rigid connection structure is connected with the energy absorption structure, and the other end is spaced from or abutted against the piezoelectric substrate; the signal input component converts electromagnetic wave signals into mechanical waves, the nonlinear attenuation component deforms under propagation of the mechanical waves, the deformation quantity is in direct proportion to the strength of the mechanical waves, and the signal output component converts the mechanical waves into the electromagnetic wave signals and outputs the electromagnetic wave signals. According to the invention, electromagnetic protection can be realized based on mechanical wave nonlinear attenuation.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic protection technology, and in particular to an electromagnetic protection device based on nonlinear attenuation of mechanical waves. Background Art

[0002] With the rapid development of modern electronics and communication technology, electromagnetic technology has been deeply applied to all aspects of daily production and life. The electromagnetic radiation generated by the operation of various electronic information systems and related infrastructure has been widely present in the space environment, making the electromagnetic environment for equipment operation and human survival increasingly complex.

[0003] Electromagnetic radiation has become an emerging source of pollution due to its serious hazards and difficulty in protection. What is more serious is that there is also a type of intentional electromagnetic interference, that is, intentionally creating high-intensity electromagnetic pulse energy for special purposes to disrupt, interrupt or destroy electronic systems and equipment. Strong electromagnetic pulses have the characteristics of high power and high energy, and have very strong destructive power. They can cause serious damage to electronic equipment working at a distance (even in the off state). Among them, the typical application form is high-power electromagnetic microwaves, which have now developed into an important form of information confrontation.

[0004] In the prior art, electromagnetic protection modules usually use limiters, and PIN diodes are the most widely used power control devices in microwave limiters. Therefore, PIN diode limiters are widely used in current domestic and foreign equipment to improve the survivability of equipment under strong electromagnetic attacks. The principle is the nonlinear limiting mechanism of PIN diodes. The equivalent microwave impedance of PIN diodes is controlled by microwave power, and the attenuation of low-power signals is very small, with only a small insertion loss. Microwave signals can pass almost unimpeded, while high-power microwave signals will cause conductivity modulation of PIN diodes, attenuating the input microwave signal.

[0005] However, since PIN diodes are semiconductor devices, the upper power limit they can withstand is not high, making them prone to breakdown under high-power microwave radiation, and there is a problem of irrecoverable breakdown; PIN diodes also have a contradiction between operating frequency and protection power. Increasing the protection power will inevitably increase the junction capacitance of semiconductor devices, resulting in high operating frequency and non-protective working conditions that seriously affect the quality of transmission signals, making it difficult to adapt to the future development of electronic systems. Summary of the invention

[0006] Based on this, it is necessary to provide an electromagnetic protection device based on nonlinear attenuation of mechanical waves to address the above technical problems, which can achieve electromagnetic protection based on nonlinear attenuation of mechanical waves instead of using diodes.

[0007] An electromagnetic protection device based on nonlinear attenuation of mechanical waves, comprising: a piezoelectric substrate, and a signal input component, a nonlinear attenuation component and a signal output component sequentially arranged on the piezoelectric substrate; The nonlinear attenuation component comprises: an energy absorbing structure, a deformation structure and a rigid connection structure; the energy absorbing structure is made of an energy absorbing material and is spaced above the piezoelectric substrate; the deformation structure is made of a mechanical metamaterial, and its two ends are respectively connected to the energy absorbing structure and the piezoelectric substrate; one end of the rigid connection structure is connected to the energy absorbing structure, and the other end is spaced from the piezoelectric substrate or abuts against the piezoelectric substrate; The signal input component converts the input electromagnetic wave signal into a mechanical wave and transmits it to the nonlinear attenuation component. The nonlinear attenuation component deforms under the propagation of the mechanical wave and the deformation amount is proportional to the mechanical wave intensity. The signal output component converts the mechanical wave output by the nonlinear attenuation component into an electromagnetic wave signal and outputs it.

[0008] In one embodiment, the deformation structure and the rigid connection structure are both in plurality and are cross-arranged between the energy absorbing structure and the piezoelectric substrate.

[0009] In one embodiment, the deformable structure comprises: a plurality of cubic frames; Adjacent cubic frames are connected so that the deformable structure forms a plate array, and the thickness direction of the plate array is consistent with the propagation direction of the mechanical wave.

[0010] In one embodiment, the rigid connection structure includes: a connection sheet; The connecting sheet is a sheet-like structure, and the thickness direction of the sheet-like structure is consistent with the propagation direction of the mechanical wave.

[0011] In one embodiment, the connecting sheet is wavy. In one embodiment, the rigid connection structure includes: one or more connection columns; When there are more than two connecting posts, all the connecting posts are arranged in parallel and spaced apart to form a fence-like array perpendicular to the propagation direction of the mechanical wave.

[0012] In one embodiment, the connecting column comprises: a column body and a column cap connected to the column body; The column body is a cylindrical structure, the column cap is a circular plate structure, and the column cap is spaced apart from the piezoelectric substrate.

[0013] In one embodiment, the signal input component and the signal output component are both interdigital transducers.

[0014] In one embodiment, the distance between the signal input component and the signal output component satisfies:

[0015] in, Indicates the distance between the signal input component and the signal output component, represents the interdigital period of the interdigital transducer.

[0016] In one embodiment, the electromagnetic protection device is arranged on the electromagnetic wave signal transmission line.

[0017] The above-mentioned electromagnetic protection device based on nonlinear attenuation of mechanical waves realizes the function of electromagnetic limiting by converting the microwave electromagnetic physical field into the mechanical wave physical field for nonlinear energy limiting processing; when the electromagnetic wave signal power is too large, the power of the high-power electromagnetic wave signal in the transmission process of the electromagnetic wave signal (including radio frequency signal and microwave signal) is reduced to avoid the damage of radio frequency microwave caused by excessive electromagnetic wave signal power; when the electromagnetic wave signal power is small, the electromagnetic wave signal is transmitted normally in the electromagnetic wave signal transmission line, thereby realizing the power regulation of the electromagnetic wave signal transmitted in the electromagnetic wave signal transmission line, improving the protection power, and achieving the purpose of electromagnetic protection. The present application realizes energy limiting processing through a nonlinear mechanical coupling zone, thereby avoiding the shortcoming of easy breakdown of traditional semiconductor limiters, and can protect higher microwave signal power. There is no problem of breakdown due to excessive voltage when irradiated by high-power microwaves and irrecoverable breakdown after breakdown. The present application does not have junction capacitance in the limiting process, overcomes the problem that traditional limiting protection devices such as semiconductors can withstand low upper limit power and have spike leakage, decouples the contradiction between the operating frequency and protection power of traditional limiters, does not affect the quality of transmission signals under high operating frequency and non-protective working state, and improves the survivability of electronic information systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an electromagnetic protection device based on nonlinear attenuation of mechanical waves in one embodiment; Figure 2 It is a schematic diagram of a normal working state of an electromagnetic protection device based on nonlinear attenuation of mechanical waves in one embodiment; Figure 3 It is a schematic diagram of the protection working state of an electromagnetic protection device based on nonlinear attenuation of mechanical waves in one embodiment; Figure 4 is a schematic diagram of an interdigital transducer of an electromagnetic protection device based on nonlinear attenuation of mechanical waves in one embodiment; Figure 5 It is a schematic diagram of a reflection grating of an electromagnetic protection device based on nonlinear attenuation of mechanical waves in an embodiment.

[0019] Reference numerals: Piezoelectric substrate 1; Signal input component 2; Nonlinear attenuation component 3, energy absorption structure A, deformation structure B, rigid connection structure C; Signal output component 4; Reflector 5. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0021] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple groups" means at least two groups, such as two groups, three groups, etc., unless otherwise clearly and specifically defined.

[0023] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] The present application provides an electromagnetic protection device based on nonlinear attenuation of mechanical waves, such as Figures 1 to 3 As shown, in one embodiment, it includes: a piezoelectric substrate, a signal input component, a nonlinear attenuation component and a signal output component. The piezoelectric substrate is made of piezoelectric material and serves as a bearing component to provide a bearing space so that the signal input component, the nonlinear attenuation component and the signal output component are sequentially arranged on the piezoelectric substrate.

[0026] The signal input component converts the input electromagnetic wave signal into a mechanical wave and transmits it to the nonlinear attenuation component. The nonlinear attenuation component deforms under the propagation of the mechanical wave and the deformation amount is proportional to the mechanical wave intensity. The signal output component converts the mechanical wave output by the nonlinear attenuation component into an electromagnetic wave signal and outputs it.

[0027] Among them, both the signal input component and the signal output component adopt interdigital transducer (IDT). The interdigital transducer is used to detect and excite mechanical waves on the surface of the piezoelectric substrate, so as to realize the mutual conversion between electromagnetic wave signals and mechanical wave signals; the amplitude of the mechanical wave output by the signal input component is determined by the electromagnetic wave signal, the amplitude of the mechanical wave converted by the high-power electromagnetic wave signal is large, and the amplitude of the mechanical wave converted by the low-power electromagnetic wave signal is small; the power of the electromagnetic wave signal output by the signal output component is related to the mechanical wave amplitude, the smaller the mechanical wave amplitude is, the smaller the output power of the electromagnetic wave signal is, and the larger the mechanical wave amplitude is, the larger the output power of the electromagnetic wave signal is. Preferably, the interdigital transducer selects a single-phase unidirectional transducer (SPUDT) to control the propagation direction of the wave, thereby reducing the conversion loss. The specific structure of the interdigital transducer is prior art and will not be repeated here. For example: the interdigital transducer includes two groups of interdigital electrodes, which are two groups of metal strips deposited on the surface of the piezoelectric substrate and interlaced and periodically distributed. Each group of electrodes is connected to a bus bar, and its parameters are a , b Related to the frequency of the electromagnetic wave signal (how it is related is a matter of prior art), such as Figure 4 As shown, IN represents the input terminal, OUT represents the output terminal, a represents the width of the fingers, b represents the interdigital spacing, Represents the interdigitation period.

[0028] Preferably, the distance between the signal input component and the signal output component satisfies the following formula to minimize the propagation loss while ensuring the protection performance of the device:

[0029] in, Indicates the distance between the signal input component and the signal output component, represents the interdigital period of the interdigital transducer.

[0030] The nonlinear attenuation component transmits signals and energy, allowing small-power signals to pass through while large-power signals are attenuated, and includes: energy-absorbing structures, deformation structures, and rigid connection structures.

[0031] The energy absorbing structure is made of energy absorbing material and is used to absorb the mechanical wave energy transmitted by the rigid connection structure. The energy absorbing structure is a plate-like structure and is arranged above the piezoelectric substrate at intervals, so that an accommodation space is formed between the energy absorbing structure and the piezoelectric substrate, and a deformation structure and a rigid connection structure are arranged in the accommodation space.

[0032] The deformable structure is made of mechanical metamaterials and has a deformation mode that does not consume elastic energy, through which the nonlinear adjustment of the amplitude of the mechanical wave can be achieved. The two ends of the deformable structure are connected to the energy absorbing structure and the piezoelectric substrate respectively. The deformable structure has a first state and a second state; when a normal electromagnetic wave signal propagates, the deformable structure is in the first state and the deformation is relatively small; when a strong electromagnetic wave signal propagates, the deformable structure is in the second state and the deformation is relatively large.

[0033] The rigid connection structure is used to conduct mechanical wave energy. One end of the rigid connection structure is connected to the energy absorbing structure, and the other end is spaced apart from the piezoelectric substrate (i.e. suspended) or abuts against the piezoelectric substrate. Specifically: when a normal electromagnetic wave signal is propagating, the deformation structure is in the first state, and the other end of the rigid connection structure is spaced apart from the piezoelectric substrate; when a strong electromagnetic wave signal is propagating, the deformation structure is in the second state, and the other end of the rigid connection structure abuts against the piezoelectric substrate. By adjusting the suspension amplitude of the rigid connection structure (i.e. the length of the rigid connection structure), the electromagnetic protection threshold can be adjusted; the larger the suspension amplitude of the rigid connection structure, the smaller the length of the rigid connection structure, the higher the electromagnetic protection threshold, and a larger vibration energy is required to achieve protection; the smaller the suspension amplitude of the rigid connection structure, the larger the length of the rigid connection structure, the lower the electromagnetic protection threshold, and a smaller vibration energy is required to achieve protection.

[0034] Preferably, there are multiple deformable structures and rigid connection structures, which are cross-arranged between the energy absorbing structure and the piezoelectric substrate to perform multiple layer-by-layer nonlinear attenuation of the mechanical waves, thereby further improving the electromagnetic protection performance.

[0035] In one embodiment, the deformable structure includes: a plurality of cubic frames; adjacent cubic frames are connected so that the deformable structure forms a plate array, and the thickness direction of the plate array is consistent with the propagation direction of the mechanical wave.

[0036] In one embodiment, the rigid connection structure includes: a connection sheet; the connection sheet is a sheet-like structure, and the thickness direction of the sheet-like structure is consistent with the propagation direction of the mechanical wave.

[0037] Preferably, the connecting piece is wavy to further improve the electromagnetic protection performance. In one embodiment, the rigid connection structure includes: more than one connection column; when there are more than two connection columns, all the connection columns are arranged in parallel and spaced apart to form a fence-like array perpendicular to the propagation direction of the mechanical wave.

[0038] Preferably, the connecting column includes: a column body and a column cap connected to the column body; the column body is a cylindrical structure, the column cap is a circular plate structure, and the column cap is spaced apart from the piezoelectric substrate to increase the coupling area of ​​the mechanical wave, improve the nonlinear attenuation effect, and thereby improve the electromagnetic protection effect.

[0039] In one embodiment, it further includes: a reflection grating, that is, the electromagnetic protection device includes: a piezoelectric substrate, a signal input component, a nonlinear attenuation component, a signal output component and a reflection grating. There are two reflection gratings, both of which are arranged on the piezoelectric substrate, and the signal input component, the nonlinear attenuation component and the signal output component are arranged between the two reflection gratings. That is to say, one reflection grating, the signal input component, the nonlinear attenuation component, the signal output component and the other reflection grating are arranged in sequence on the piezoelectric substrate, so that the reflection grating reflects mechanical waves and prevents energy from diffusing to the outside, thereby reducing propagation losses.

[0040] like Figure 5 As shown, preferably, the reflective grating includes: two first parts and multiple second parts, the first parts and the second parts are both strip structures, the multiple second parts are arranged in parallel and spaced apart, one corresponding end of all the second parts is connected to one long side of a first part, and the other corresponding end is connected to one long side of another first part.

[0041] It should be noted that the electromagnetic protection device is arranged at any position on the electromagnetic wave signal transmission line, such as: the starting end of the electromagnetic wave signal transmission line, the end end of the electromagnetic wave signal transmission line and / or the middle position of the electromagnetic wave signal transmission line, that is, the signal input component and the signal output component are connected to the electromagnetic wave signal transmission line. The electromagnetic wave signal transmission line is used for the conduction of electromagnetic wave signals, including: substrate integrated waveguide structure (SIW for short), coplanar waveguide structure (CPW for short), rectangular waveguide structure, and coaxial line.

[0042] It should also be noted that the piezoelectric materials of the piezoelectric substrate include: lithium niobate ( ), lithium tantalate, quartz crystal, barium titanate BT or lead zirconate titanate PZT, to have a higher mechanical coupling coefficient and reduce the energy loss during the conversion of electromagnetic wave signals. The energy-absorbing materials of the energy-absorbing structure include: sponge, rubber or latex. The mechanical metamaterial of the deformation structure uses metamaterials whose deformation amount changes with the amplitude of the mechanical wave, including: zero-mode mechanical metamaterials, which can deform with the amplitude of the mechanical wave and hardly absorb mechanical wave energy, so as to reduce the propagation loss of mechanical waves. The rigid connection structure uses MEMS materials with small deformation and easy processing, including: silicon, glass, quartz. The specific materials are all existing technologies and will not be repeated here.

[0043] The working process of this application is: When a normal electromagnetic wave signal (the power of the electromagnetic wave signal is relatively small) is input from the signal input component, the mechanical wave generated by the excitation propagates to the nonlinear attenuation component, the amplitude of the mechanical wave is relatively small, the deformation of the deformable structure made of the mechanical metamaterial is relatively small, the rigid connection structure is in a suspended state, and is not in direct contact with the piezoelectric substrate. The mechanical wave can propagate normally through the nonlinear mechanical coupling region formed by the nonlinear attenuation component with almost no attenuation loss, and finally reaches the signal output component and is converted into an electromagnetic wave signal by the signal output component and then output; When a strong electromagnetic wave signal (the power of the electromagnetic wave signal is relatively large) is input by the signal input component, the mechanical wave generated by the excitation propagates to the nonlinear attenuation component and reaches a set threshold value (the nonlinear attenuation component can absorb mechanical waves that reach a certain threshold value, but almost does not absorb mechanical waves with an amplitude lower than the threshold value. The set threshold value is related to the electromechanical coupling coefficient of the piezoelectric material, the deformation amplitude of the mechanical metamaterial, and the length of the rigid connection structure. The specific threshold value can be obtained by experiment using existing technology and will not be repeated here). The amplitude of the mechanical wave is relatively large, and the deformation of the deformable structure made of the mechanical metamaterial is relatively large (that is, a significant deformation occurs), and the deformation After the voltage reaches the threshold, the rigid connection structure abuts against the piezoelectric substrate, that is, directly contacts it. Most of the energy of the mechanical wave is transmitted to the energy absorbing structure through the rigid connection structure and absorbed by the energy absorbing structure. The mechanical wave is greatly attenuated, and only a small part of the energy is transmitted to the signal output component. The output power of the electromagnetic wave signal is limited, so that the power of the electromagnetic wave signal in the electromagnetic wave signal transmission line is reduced and then transmitted to the back-end circuit, thereby protecting the back-end circuit and preventing the damage of the RF microwave devices in the back-end circuit due to the excessive power of the electromagnetic wave signal in the electromagnetic wave signal transmission line, achieving a mechanical limiting effect and realizing the function of electromagnetic protection.

[0044] The above-mentioned electromagnetic protection device based on nonlinear attenuation of mechanical waves realizes the function of electromagnetic limiting by converting the microwave electromagnetic physical field into the mechanical wave physical field for nonlinear energy limiting processing; when the electromagnetic wave signal power is too large, the power of the high-power electromagnetic wave signal in the transmission process of the electromagnetic wave signal (including radio frequency signal and microwave signal) is reduced to avoid the damage of radio frequency microwave caused by excessive electromagnetic wave signal power; when the electromagnetic wave signal power is small, the electromagnetic wave signal is transmitted normally in the electromagnetic wave signal transmission line, thereby realizing the power regulation of the electromagnetic wave signal transmitted in the electromagnetic wave signal transmission line, improving the protection power, and achieving the purpose of electromagnetic protection. The present application realizes energy limiting processing through a nonlinear mechanical coupling zone, thereby avoiding the shortcoming of easy breakdown of traditional semiconductor limiters, and can protect higher microwave signal power. There is no problem of breakdown due to excessive voltage when irradiated by high-power microwaves and irrecoverable breakdown after breakdown. The present application does not have junction capacitance in the limiting process, overcomes the problem that traditional limiting protection devices such as semiconductors can withstand low upper limit power and have spike leakage, decouples the contradiction between the operating frequency and protection power of traditional limiters, does not affect the quality of transmission signals under high operating frequency and non-protective working state, and improves the survivability of electronic information systems.

[0045] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0046] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An electromagnetic protection device based on nonlinear attenuation of mechanical waves, characterized in that: include: A piezoelectric substrate and a signal input component, a nonlinear attenuation component and a signal output component sequentially arranged on the piezoelectric substrate; The nonlinear attenuation component comprises: an energy absorbing structure, a deformation structure and a rigid connection structure; the energy absorbing structure is made of an energy absorbing material and is spaced above the piezoelectric substrate; the deformation structure is made of a mechanical metamaterial, and its two ends are respectively connected to the energy absorbing structure and the piezoelectric substrate; one end of the rigid connection structure is connected to the energy absorbing structure, and the other end is spaced from the piezoelectric substrate or abuts against the piezoelectric substrate; The signal input component converts the input electromagnetic wave signal into a mechanical wave and transmits it to the nonlinear attenuation component. The nonlinear attenuation component deforms under the propagation of the mechanical wave and the deformation amount is proportional to the mechanical wave intensity. The signal output component converts the mechanical wave output by the nonlinear attenuation component into an electromagnetic wave signal and outputs it.

2. The electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 1, characterized in that: There are multiple deformation structures and rigid connection structures, which are cross-arranged between the energy absorbing structure and the piezoelectric substrate.

3. An electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 1 or 2, characterized in that: The deformable structure comprises: a plurality of cubic frames; Adjacent cubic frames are connected so that the deformable structure forms a plate array, and the thickness direction of the plate array is consistent with the propagation direction of the mechanical wave.

4. The electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 1 or 2, characterized in that: The rigid connection structure comprises: a connection sheet; The connecting sheet is a sheet-like structure, and the thickness direction of the sheet-like structure is consistent with the propagation direction of the mechanical wave.

5. The electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 4, characterized in that: The connecting piece is wavy.

6. An electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 1 or 2, characterized in that: The rigid connection structure includes: one or more connection columns; When there are more than two connecting posts, all the connecting posts are arranged in parallel and spaced apart to form a fence-like array perpendicular to the propagation direction of the mechanical wave.

7. The electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 6, characterized in that: The connecting column comprises: a column body and a column cap connected to the column body; The column body is a cylindrical structure, the column cap is a circular plate structure, and the column cap is spaced apart from the piezoelectric substrate.

8. The electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 1 or 2, characterized in that: The signal input component and the signal output component both adopt interdigital transducers.

9. The electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 8, characterized in that: The distance between the signal input component and the signal output component satisfies: in, Indicates the distance between the signal input component and the signal output component, represents the interdigital period of the interdigital transducer.

10. An electromagnetic protection device based on nonlinear attenuation of mechanical waves according to claim 1 or 2, characterized in that: The electromagnetic protection device is arranged on the electromagnetic wave signal transmission line.

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